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Cardiac Enlargement in the Chick Embryo Induced by Hypothermic Incubation Is Due to a Combination of Hyperplasia and Hypertrophy of Cardiomyocytes.
Hypothermic incubation of chicken eggs leads to smaller embryos with enlarged hearts, originally described as hypertrophic. Over the years, however, accumulated evidence suggested that hyperplasia, rather than hypertrophy, is the predominant mechanism of cardiac growth during the prenatal period. We have thus set to re-evaluate the hypothermia model to precise the exact cellular mechanism behind cardiac enlargement. Fertilized chicken eggs were incubated at either 37.5 °C (normothermia) or 33.5 °C from embryonic day (ED) 13 onward (hypothermia). Sampling was performed at ED17, at which point wet embryo and heart weight were recorded, and the hearts were submitted to histological examination. In agreement with previous results, the hypothermic embryos were 29% smaller and had hearts 18% larger, translating into a 67% increase in the heart to body weight ratio (P < 0.05 for all parameters). The cell size was essentially the same between control and hypothermic hearts in all regions analysed. Likewise, there was no significant relationship between the cell size and heart weight; however, in the hypothermic hearts, there was a trend showing positive correlation between cell sizes in different cardiac regions and heart weight. Proliferation rate, determined on the basis of anti-phosphohistone H3 immunofluorescence, showed an overall increase in the hypothermic group, reaching statistical significance (P = 0.02, t-test) in the right ventricle. The proliferation rate was similar among different regions of the same heart. However, the correlation between the proliferation rate and heart weight was only small (r2 = 0.007 and r2 = 0.234 for the normothermic and hypothermic group, respectively). We thus conclude that hyperplasia is the predominant response mechanism in this volume-overload model; mechanistically, decreased heart rate at lower temperature increases the end-diastolic and stroke volume, minimizing the drop in cardiac output through the Frank- Starling mechanism. | {
"pile_set_name": "PubMed Abstracts"
} |
Prevalence and genotypic characteristics of beta-lactamase-negative ampicillin-resistant Haemophilus influenzae in Australia.
To determine the prevalence of β-lactamase-negative ampicillin-resistant (BLNAR) Haemophilus influenzae in Australia and characterize the associated amino acid substitutions in penicillin-binding protein 3. Two hundred consecutive non-repeat clinical isolates of H. influenzae were collected and β-lactamase-negative isolates were screened for reduced ampicillin susceptibility using an ampicillin 2 μg disc (breakpoint <17 mm) and Etest (breakpoint ≥0.25 mg/L). All screen-positive isolates had their ampicillin MICs determined by reference broth microdilution and their ftsI genes were sequenced. No BLNAR strains (MIC ≥4 mg/L) were found, but 5 (2.5%) low BLNAR (L-BLNAR) strains (MIC ≥2 mg/L) and 36 (18%) genetic BLNAR (gBLNAR) strains (R517H or N526K) were found. Of the gBLNAR strains, four had the R517H substitution and the remainder had N526K, while no strains had combined N526K and M377I/S385T/L389F substitutions. A number of strains with neither R517H nor N526K substitutions that did not meet the gBLNAR definition had other BLNAR-associated substitutions. BLNAR and L-BLNAR strains are uncommon in Australia, while gBLNAR strains are more common than previously recognized. | {
"pile_set_name": "PubMed Abstracts"
} |
[A case of Fisher's syndrome after Haemophilus influenzae infection].
We report a case of Fisher's syndrome with serological evidence of antecedent Haemophilus influenzae infection. A 66-year-old woman developed unsteady gait and multiple cranial nerve palsies after upper respiratory infection. Serum anti-GQ 1 b and anti-GT 1 a IgG antibodies were positive. In the acute phase of the illness, her serum had high titers of IgM, IgG and IgA anti-H. influenzae antibodies, which significantly decreased during the clinical course. Further study is needed to clarify the clinical and immunological features of Fisher's syndrome after H. influenzae infection. | {
"pile_set_name": "PubMed Abstracts"
} |
Risk domains associated with an adolescent alcohol dependence diagnosis.
To determine the contribution of familial, interpersonal, academic and early substance use factors to relative risk for an alcohol dependence (AD) diagnosis in adolescents. Information on 619 adolescents and their 390 sets of biological parents was obtained using the adolescent version of the Child Semi-Structured Assessment for the Genetics of Alcoholism (C-SSAGA) and the adult counterpart of this instrument, the Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA). The C-SSAGA elicits a wide range of environmental, social, and psychiatric diagnostic information. Specific domain scale scores associated with an adolescent AD were computed, and generalized estimating equations (GEE) modeling was used to determine the odds ratio (relative risk) of the specified risk domains for an alcohol dependence diagnosis. Risk factors for a DSM-III-R AD diagnosis included being at least 16 years of age, as well as negative parent-child interactions, school and personal-related difficulties (including the presence of an externalizing or internalizing DSM-III-R non-alcohol-related diagnosis), and early experimentations with a variety of substances. An array of familial, interpersonal, academic and early substance use factors were strongly associated with adolescent AD. Given the findings of this study, further research to determine temporal relationships that might influence the onset of adolescent alcohol dependence is warranted. | {
"pile_set_name": "PubMed Abstracts"
} |
Reconciling the new demands for food protection with environmental needs in the management of livestock wastes.
Government policy in many countries has been to promote manure management methods to reduce the negative impacts related to water and air pollution. The central strategy of encouraging manure as a fertiliser rather than treating it as a waste, is under threat from new concerns on public health and especially food quality. Restrictions on manure applications to certain food crops and the stipulation of treatment to 70 degrees C for 1h (in the case of manure products) represent barriers to the use of such material as a useful organic product in the farming and horticultural industries. However, the sensible development of spreading plans in which high and low risk land is identified can enable appropriate and effective treatment for each situation and minimise overall cost. In the high risk situations, processes based on heat treatment remain the most reliable but there still remains the need to ensure a minimum temperature to ensure a satisfactory treatment. Direct application of heat available from biogas coupled with heat recovery may make thermal treatment of effluents a viable option where no effective environmental friendly alternatives exist. | {
"pile_set_name": "PubMed Abstracts"
} |
Genetic engineering of baker's and wine yeasts using formaldehyde hyperresistance-mediating plasmids.
Yeast multi-copy vectors carrying the formaldehyde-resistance marker gene SFA have proved to be a valuable tool for research on industrially used strains of Saccharomyces cerevisiae. The genetics of these strains is often poorly understood, and for various reasons it is not possible to simply subject these strains to protocols of genetic engineering that have been established for laboratory strains of S. cerevisiae. We tested our vectors and protocols using 10 randomly picked baker's and wine yeasts all of which could be transformed by a simple protocol with vectors conferring hyperresistance to formaldehyde. The application of formaldehyde as a selecting agent also offers the advantage of its biodegradation to CO2 during fermentation, i.e., the selecting agent will be consumed and therefore its removal during down-stream processing is not necessary. Thus, this vector provides an expression system which is simple to apply and inexpensive to use. | {
"pile_set_name": "PubMed Abstracts"
} |
Simian virus 40 A gene function: further characterization and growth of tsA transformed chinese hamster cells.
Chinese hamster embryo cells transformed with the tsA 58 mutant of Simian virus 40 express the transformed phenotype at the permissive temperature (33 degrees C or 37 degrees C) and a "normal" phenotype at the nonpermissive temperature (40.5 degrees C). Immunofluorescence and immunoprecipitation of T antigens demonstrated that the "T" antigen (100 K) has an increase rate of synthesis and degradation at 40.5 degrees C. However, the cells continue to replicate at the nonpermissive temperature when assayed by flow cytometry and autoradiography. This DNA synthesis was cellular, not viral, and not owing to an increase in DNA repair. When the cell cycle distributions of G1, S, and G2 + M were assayed by the fraction labeled mitoses method, no differences were evident at the permissive and nonpermissive temperature; however, the doubling time was lengthened at 40.5 degrees C (13 hours vs. 100 hours). These results suggest that at 40.5 degrees C, the tsA transformed cells are cycling and dying. However, if the transformed cells are seeded onto monolayers of normal Chinese hamster cells at 40.5 degrees C, the cells are growth arrested when measured by growth assays, flow cytometry, autoradiography, and immunofluorescence for T antigen. Therefore, growth arrest can be obtained in tsA 58 transformed Chinese hamster cells when cocultured with normal Chinese hamster cells. | {
"pile_set_name": "PubMed Abstracts"
} |
Change of anti-Mullerian-hormone levels during follicular phase in PCOS patients.
Anti-Mullerian-hormone (AMH) does not seem to fluctuate significantly during the menstrual cycle in healthy women. However, little is known about cycle fluctuations of AMH levels in patients with polycystic ovarian syndrome (PCOS). The purpose of this study was to examine AMH fluctuations during the follicular phase in PCOS patients receiving antiestrogens or recombinant follicle-stimulating hormone (FSH). About 40 PCOS patients diagnosed according to Rotterdam ESHRE/ASRM-Sponsored PCOS Consensus Workshop Group 2003 and 19 controls were prospectively enrolled. PCOS patients received either antiestrogens or recombinant FSH for monoovulation induction and controls received antiestrogens. AMH levels were determined (1) between the 2nd and the 5th day of follicular phase and (2) when a single large dominant follicle ≥18 mm had appeared. Our study shows that AMH levels do not change during follicular development in controls as well as in PCOS patients with AMH levels < 5 ng/ml, irrespective of antiestrogen or FSH therapy. However, in PCOS patients with AMH levels ≥5 ng/ml, AMH declines significantly during follicular development (p < 0.01). We conclude that AMH levels should be determined in the early follicular phase in PCOS patients without the influence of antiestrogens or exogenous FSH, because these interventions may lower AMH values in patients with high levels. | {
"pile_set_name": "PubMed Abstracts"
} |
Covariability of selected amino acid positions for HIV type 1 subtypes C and B.
We studied covariability of selected amino acid positions in globally dominant HIV-1 subtype C viruses. The analyzed sequences spanned the V3 loop, Gag p17, Gag p24, and five CTL epitope-rich regions in Gag, Nef, and Tat. The corresponding regions in HIV-1 subtype B were also evaluated. The analyses identified a great number of covarying pairs and triples of sites in the HIV-1B V3 loop (173 site pairs, 242 site triples). Several of these interactions were found in the earlier studies [e.g., the V3 loop covariability analyses by Korber et al. (Proc Natl Acad Sci USA 1993;90:7176-7180) and Bickel et al. (AIDS Res Hum Retroviruses 1996;12:1401-1411)] and have known biological significance. However, generally these key covarying sites did not covary in the HIV-1C V3 loop (total 17 covarying site pairs), suggesting that the V3 loop may have subtype differences in functional or structural operating characteristics. Covariability of positions 309 and 312 was observed in the immunodominant region HIV-1C Gag 291-320 but no covariability was found in the corresponding region of HIV-1B, and vice versa for Nef 122-141; these findings may reflect subtype-specific covariability within immunologically relevant regions. Gag p17 exhibited greater covariability and less diversity for HIV-1B than HIV-1C, raising the hypothesis that Gag p17 is highly immunodominant in HIV-1B and is especially important for HIV-1B vaccines. Information on covariability should be better exploited in assessments of HIV-1 diversity and how to surmount it with vaccine design. | {
"pile_set_name": "PubMed Abstracts"
} |
Depth of cure and surface microhardness of composite resin cured with blue LED curing lights.
This study examined the depth of cure and surface microhardness of Filtek Z250 composite resin (3M-Espe) (shades B1, A3, and C4) when cured with three commercially available light emitting diode (LED) curing lights [E-light (GC), Elipar Freelight (3M-ESPE), 475H (RF Lab Systems)], compared with a high intensity quartz tungsten halogen (HQTH) light (Kerr Demetron Optilux 501) and a conventional quartz tungsten halogen (QTH) lamp (Sirona S1 dental unit). The effects of light source and resin shade were evaluated as independent variables. Depth of cure after 40 s of exposure was determined using the ISO 4049:2000 method, and Vickers hardness determined at 1.0 mm intervals. HQTH and QTH lamps gave the greatest depth of cure. The three LED lights showed similar performances across all parameters, and each unit exceeded the ISO standard for depth of cure except GC ELight for shade B1. In terms of shade, LED lights gave greater curing depths with A3 shade, while QTH and HQTH lights gave greater curing depths with C4 shade. Hardness at the resin surface was not significantly different between LED and conventional curing lights, however, below the surface, hardness reduced more rapidly for the LED lights, especially at depths beyond 3 mm. Since the performance of the three LED lights meets the ISO standard for depth of cure, these systems appear suitable for routine clinical application for resin curing. | {
"pile_set_name": "PubMed Abstracts"
} |
Rapid overgrowth of a fetus after interruption of insulin therapy in a diabetic woman.
We experienced a case of fetal overgrowth probably due to maternal hyperglycemia following the interruption of insulin therapy in a woman with gestational diabetes mellitus (GDM), probably undiagnosed type 2 diabetes mellitus. A 27-year-old Japanese woman was referred to our center because of GDM at 15 weeks of gestation. During the course of her educational admission, diet control and insulin therapy resulted in favorable blood sugar levels and she was discharged at 17 weeks of gestation. During these periods, fetal growth remained below average at between -1 and -1.5 S.D. After a check-up in the 29th week, she failed to appear for any further appointments. After the onset of labor, at 38 weeks of gestation, she suddenly consulted her former physician who delivered a baby weighing 4852g by cesarean section on the 38th week. A noteworthy point in this case is the growth curve of the fetus. Even if rapid overgrowth is assumed, starting after the time of interruption of insulin at 30 weeks of gestation, fetal weight gain appears to be about 400g per week, suggesting a weight increase at twice the normal rate. This case prompted us to keep in mind that rigid glycemic control will prevent the development of fetal macrosomia in diabetic pregnant women. | {
"pile_set_name": "PubMed Abstracts"
} |
Development of a Standardized Grading Scale for Atherosclerotic Disease of the Head and Neck.
For research and risk factor analysis, a reproducible method quantifying atherosclerosis is necessary. Our aim was to develop a computed tomography (CT) angiography grading system to quantify atherosclerotic disease of the head and neck. Institutional review board-approved, retrospective analysis was performed on 152 patients who underwent head/neck CT angiography. A grading scale was designed to calculate plaque burden at multiple sites with the sum referred to as atherosclerosis score. Three radiologists calculated scores with an overlap of cases to calculate the intraclass correlation coefficient. Without any prior training, the intraclass correlation coefficient between readers was considered fair. After a short tutorial, intraclass correlation coefficient was recalculated using separate patients, showing excellent correlation.Statistically significant positive correlation was found between atherosclerosis scale and age, hyperlipidemia, hypertension, and diabetes, but no correlation with sex or smoking status. A simple, visual grading scale for atherosclerosis in head/neck CT angiography was used to standardize reporting and better characterize a patient's risk of stroke. | {
"pile_set_name": "PubMed Abstracts"
} |
CORRELATION OF SOUND GENERATION AND METABOLIC HEAT FLUX IN THE BUMBLEBEE BOMBUS LAPIDARIUS
Flying insects produce extreme amounts of heat as a by-product during the contractions of their thoracic flight muscles (Heinrich, 1989). Before flight, metabolic heat may serve to warm up the thoracic muscles until the minimum lift-off temperature is reached (Heinrich, 1974b; Stone and Willmer, 1989; Esch and Goller, 1991). Social bees and wasps are also able to use the heat produced in their flight muscles for brood incubation and for active regulation of nest temperatures (Heinrich, 1974a; Seeley and Heinrich, 1981; Schultze-Motel, 1991). In this study, we report simultaneous measurements of heat flux and sound generation by wing buzzing in individual bumblebee workers (Bombus lapidarius L.). Bumblebees used in the experiments were taken from colonies in observation nest boxes (Schultze-Motel, 1991) and placed into the cylindrical 100 ml stainless-steel vessel of a Calvet-type microcalorimeter (MS 70, Setaram, Lyon; Wadso, 1987). A small microphone had been installed below the screw cap of the calorimeter vessel. The sensitivity of the calorimeter under these conditions was 41.7 mV W-1. Both the calorimeter and the microphone signals were amplified and recorded on a dual-channel chart recorder. In 32 out of a total of 36 measurements, the bumblebees showed prolonged periods of sound generation, most frequently at the beginning of experiments. We assume that the sound was not produced in an alarm reaction, but by flight movements of the wings when the animals attempted to lift off inside the calorimeter vessel. The buzzing sounds produced by bumblebees are caused by oscillations of the flight muscles inside the metathorax (Schneider, 1975). Previous endoscopic observations of bumblebees sitting on the bottom of our calorimeter vessel had shown that there was a one-to-one correlation between episodes of wing movements and sound production. The microphone recordings thus allowed an easy way of measuring locomotor activity inside the calorimeter. The simultaneous recordings of calorimeter and microphone signals showed a very good agreement between periods of sound generation and increased metabolic heat flux from the animals. This was most conspicuous in some experiments without continuous wing buzzing activity but with distinct episodes of intense sound generation that were always coupled to a simultaneous increase of heat flux (Fig. 1). Between episodes of sound generation, heat flux typically returned from maxima exceeding 200 W kg-1 to basal values around 10 W kg-1. During one experiment, we recorded a deviation from the usually observed synchronism between metabolic heat flux and sound generation (Fig. 2). The acoustic activity of the animal started about 45 min after the beginning of the experiment. Remarkably, the heat flux signal showed a steep increase as early as 5 min before the first sound generation was observed. During the period of continuous wing buzzing, heat fluxes of more than 350 W kg-1 were measured. These fluxes correspond to metabolic rates during free flight in other Hymenoptera: about 300 W kg-1 in the carpenter bee Xylocopa capitata (Nicolson and Louw, 1982), 300-500 W kg-1 in honeybees, Apis mellifera (Nachtigall et al. 1989) and about 350 W kg-1 in the bumblebees Bombus lucorum and B. pascuorum flying in a wind tunnel (Ellington et al. 1990). We suggest that the sharp increase in heat flux before the beginning of sound generation represents a preflight endothermic warm-up event. Apparently, the warm-up of flight muscles proceeded without any wing buzzing. | {
"pile_set_name": "PubMed Abstracts"
} |
Isolation and characterization of antistasin. An inhibitor of metastasis and coagulation.
The purpose of this study was to purify and characterize the agent responsible for the antimetastatic activity of an extract of the salivary glands (SGE) of the Mexican leech Haementeria officinalis. When administered intravenously in mice on the same day as the intravenous inoculation of T241 sarcoma cells, SGE markedly reduces the number and size of lung tumor colonies. In designing a purification protocol for the antimetastatic agent, we postulated that the antimetastatic agent would also display anticoagulant activity. Thus, we discovered that heparin affinity chromatography followed by anion-exchange chromatography results in a fraction highly enriched in both potent anticoagulant activity and potent antimetastatic activity. Approximately, 200-300 micrograms of purified protein is isolated from 150 mg of SGE. As little as 15 micrograms of this material inhibits tumor cell metastasis to the same extent as 1.0 mg of the unfractionated SGE. When analyzed on sodium dodecyl sulfate gels the active fraction consists mainly of one polypeptide band having an apparent molecular weight of approximately 17,000 under either reducing or nonreducing conditions. The protein has a pI of approximately 9.5 and a molecular weight of approximately 17,000 under nondenaturing conditions. A specific antiserum prepared against the 17,000-dalton protein indicated that this protein is the major anticoagulant and antimetastatic agent of leech salivary gland extract. We have termed this anticoagulant, antimetastatic agent "antistasin." We hypothesize that antistatin inhibits coagulation via factor Xa, and not thrombin, since factor Xa, but not thrombin, is rapidly inactivated upon addition of antistasin. The mechanism of antistasin's antimetastatic activity is currently under investigation. | {
"pile_set_name": "PubMed Abstracts"
} |
Generics and substitution modalities: proposed methods for the evaluation of equivalence, traceability and pharmacovigilance reporting.
The use of generics results in savings for the budget of the health insurance, and no player of health could question seriously the principle. The generic drug of a reference medicinal product defines itself as a drug having the same qualitative and quantitative composition in active ingredients, the same dosage form and the bioequivalence with this reference medicinal product was demonstrated by appropriate studies of bioavailability. It is the right to switch granted to the pharmacists in 1999 that is at the origin of the real development of these specialties on the French pharmaceutical market. Nevertheless, about 10 years later, it seems that the system in place does not offer all the necessary securities with regard to pharmacovigilance, notably for the products with narrow therapeutic margin. By strengthening and/or by completing the role played by the health care professionals and the public institutions concerned, it is highly possible to improve the robustness of the system. Also, the recent arrival in Europe of the biosimilars, similar molecules but not bioequivalent to biological products, cause an even more tricky specific situation than that of the generics because of their nature, of the difficulty to manufacture them, and of the risk of immunogenicity. If the substitution is not permitted in several European countries including France, the other issues can appear especially in case of interchangeability requiring also, the reinforcement of certain measures.The various aspects are described in this article with concrete proposals on how the current system can be made safer, both for the generics and the biosimilars. | {
"pile_set_name": "PubMed Abstracts"
} |
Mechanistic investigations into the asymmetric transfer hydrogenation of ketones catalyzed by pseudo-dipeptide ruthenium complexes.
The combination of N-Boc-protected alpha-amino acid hydroxyamides (pseudo-dipeptides) and [{Ru(p-cymene)Cl(2)}(2)] resulted in the formation of superior catalysts for the asymmetric transfer hydrogenation (ATH) of non-activated aryl alkyl ketones in propan-2-ol. The overall kinetics of the ATH of acetophenone to form 1-phenylethanol in the presence of ruthenium pseudo-dipeptide catalysts were studied, and the individual rate constants for the processes were determined. Addition of lithium chloride to the reaction mixtures had a strong influence on the rates and selectivities of the processes. Kinetic isotope effects (KIEs) for the reduction were determined and the results clearly show that the hydride transfer is rate-determining, whereas no KIEs were detected for the proton transfer. From these observations a novel bimetallic outer-sphere-type mechanism for these ATH process is proposed, in which the bifunctional catalysts mediate the transfer of a hydride and an alkali metal ion between the hydrogen donor and the substrate. Furthermore, the use of a mixture of propan-2-ol and THF (1:1) proved to enhance the rates of the ATH reactions. A series of aryl alkyl ketones were reduced under these conditions in the presence of 0.5 mol % of catalyst, and the corresponding secondary alcohols were formed in high yields and with excellent enantioselectivities (>99% ee) in short reaction times. | {
"pile_set_name": "PubMed Abstracts"
} |
Predictors of morbidity in patients with indwelling ureteric stents: results of a prospective study using the validated Ureteric Stent Symptoms Questionnaire.
To assess the predictors of morbidity in patients with indwelling ureteric stents using a validated questionnaire. Eighty-six consecutive patients with indwelling double-J ureteric stent of different length and size enrolled at an Italian tertiary academic centre were prospectively evaluated with the Italian-validated Ureteric Stent Symptoms Questionnaire (USSQ), which explores the stent-related symptoms in six domains. Ureteric stents were placed for benign ureteric obstruction or after uncomplicated ureterorenoscopy, and were all removed after 28 days. The questionnaire was administered on days 7 and 28 after stent placement and on day 28 after removal. A plain abdominal X-ray was performed on days 7 and 28 after placement to determine stent location. Univariable and multivariable analyses tested the association of patient age, sex and body mass index (BMI), and stent side, length, calibre and distal loop location, with the index score of the various domains on days 7 and 28. All patients completed the study. At multivariable analysis, on day 7, sex, BMI and stent calibre were significantly associated with one domain (general health, body pain and work performance, respectively), while location of stent distal loop was significantly associated with five domains (urinary symptoms, body pain, general health, work performanc, and sexual matters). On day 28, body mass index was significantly associated with two domains (body pain and general health), while location of stent distal loop remained significantly associated with the same five domains (urinary symptoms, body pain, general health, work performance and sexual matters). Location of stent distal loop with respect to midline had the strongest association with most domains of the USSQ on both days 7 and 28 after stent placement. The visualization of stent distal loop crossing the midline may therefore identify patients at higher risk of post-procedural morbidity requiring early management. | {
"pile_set_name": "PubMed Abstracts"
} |
Cystic dystrophy of the duodenal wall associated with chronic alcoholic pancreatitis. Clinical features, diagnostic procedures and therapeutic management in a retrospective multicenter series of 23 patients.
The aim of this retrospective multicenter study was to collect data from patients with chronic alcoholic pancreatitis and cystic dystrophy of the duodenal wall in order to better understand the outcome after medical, endoscopic and/or surgical treatment. The data from medical records of 23 patients consecutively seen in ten primary referral centers from January 1990 to July 2004 were studied. Clinical, biological, and endoscopic features as well as imaging findings were recorded. Response to treatment was noted. Twenty-three patients (20 men), aged 45 years (range: 30-66), with chronic alcohol intake, cystic dystrophy of the duodenal wall, and previously known (N=14) or simultaneously diagnosed (N=9) chronic pancreatitis were included. Symptoms most frequently encountered were abdominal pain (N=22) and weight loss (N=16). An abdominal ultrasound was available for 10 patients, abdominal computed tomography for 22, upper endoscopy for 18, and endoscopic ultrasonography for 22. Endoscopic ultrasonography enabled diagnosis of cystic dystrophy of the duodenal wall in 19/22 patients. Six patients were symptom-free after alcohol withdrawal. Seven patients received octreotide 200 to 400 microg per day, 5 of whom subsequently underwent surgery (71%). Fourteen patients out of 23 were operated on (61%), 11 of whom underwent pancreaticoduodenectomy and remained symptom-free for 47 months follow-up. Mean follow-up was 56 months (range: 2-78) for non surgical patients (39%) and 47 months (range: 12-108) for surgical patients (61%). Cystic dystrophy of the duodenal wall complicating chronic alcoholic pancreatitis may be the revealing sign of pancreatitis. Endoscopic ultrasongraphy is the most reliable imaging method for diagnosis. Pancreaticoduodenectomy is the most frequently employed definitive treatment. | {
"pile_set_name": "PubMed Abstracts"
} |
Effect of Prime Blood Storage Duration on Clinical Outcome After Pediatric Cardiac Surgery.
In this study, we tested the hypothesis that in pediatric patients undergoing cardiac surgery using cardiopulmonary bypass (CPB) with blood prime, the storage duration of the packed red blood cells (PRBCs) used in prime led to differences in postoperative complications and metabolic profiles of the patients. For this prospective observational study we included 400 pediatric patients undergoing cardiac operations using CPB and requiring PRBCs prime. To study the effect of storage duration of PRBCs on postoperative morbidity, mortality, and metabolic profile, patients were divided into four groups (based on storage duration of PRBCs used in prime). Group 1: ≤7 days, group 2: 8 to 14 days, group 3: 15 to 21 days, and group 4: >21 days. On univariate analysis, patients transfused with PRBCs stored >14 days had significantly higher incidence of postoperative complications, for example, liver dysfunction, hematological complications, sepsis, and multiorgan failure. However, after regression analysis and adjusting for the other confounder's effects, no significant association was found between storage duration of PRBCs and postoperative complications and mortality. Metabolic profile of PRBCs was observed to become deranged with increasing duration of storage. This, however, improved to near physiological range early after the initiation of CPB and remained normal one hour after weaning from CPB, irrespective of the storage duration. Storage duration of PRBCs used for priming the pediatric CPB circuit neither affects the metabolic profile of the patients on CPB or early after surgery, nor it has any association with postoperative complications and mortality. | {
"pile_set_name": "PubMed Abstracts"
} |
Novel spectrofluorimetric method for measuring the activity of the enzyme alpha-L-fucosidase using the nano composite optical sensor samarium(III)-doxycycline complex doped in sol-gel matrix.
A novel, simple, sensitive, and precise spectrofluorimetric method was developed for measuring the activity of the enzyme alpha-L-fucosidase (AFU). The method was based upon measuring the quenching of the luminescence intensity of the produced yellow colored complex ion associate of 2-chloro-4-nitrophenol [2-CNP] and a nano composite optical sensor samarium(III)-doxycycline [Sm(3+)-DC](+) complex in a sol-gel matrix at 645 nm. The remarkable quenching of the luminescence intensity of the [Sm(3+)-DC](+) complex doped in a sol-gel matrix by various concentrations of the reagent [2-CNP] was successfully used as an optical sensor for the assessment of AFU activity. The calibration plot was achieved over the concentration range 3.4 x 10(-9)-1.0 x 10(-6) mol L(-1) [2-CNP] with a correlation coefficient of 0.99 and a detection limit of 6.0 x 10(-10) mol L(-1). The method was used satisfactorily for the assessment of the AFU activity in a number of serum samples collected from various patients. A significant correlation between the luminescence activity of the enzyme AFU measured by the proposed procedure and the standard method was applied to patients and controls. The method proceeds without practical artifacts compared to the standard method. | {
"pile_set_name": "PubMed Abstracts"
} |
Circulatory collapse in a parturient undergoing cesarean delivery: a diagnostic dilemma.
Embolic events including thromboembolism, air embolism, and amniotic fluid embolism can cause cardiovascular collapse during cesarean delivery. Differentiation between the three conditions is challenging because they share many of the initial clinical and echocardiographic findings, but an accurate, definitive diagnosis allows the administration of specific therapy that may help in saving the life of the mother and/or the fetus. We report a case of cardiovascular collapse during cesarean delivery under general anesthesia; massive pulmonary thromboembolism was suspected and unfractionated heparin was administered. Cardiac arrest followed and was managed with standard cardiopulmonary resuscitation, resulting in return of spontaneous circulation. Postoperatively, the patient remained hemodynamically unstable in spite of heparin, norepinephrine infusions and intravenous fluids. A transthoracic echocardiogram revealed right-sided pressure overload. Thrombolysis was initiated. Streptokinase (1,500,000IU over 2hours) was administered with no clinical response, followed by infusion (100,000IU/h) for 12hours. The patient's hemodynamics improved gradually and she was successfully weaned from norepinephrine and mechanical ventilation. Significant bleeding ensued, necessitating discontinuation of anticoagulation and transfusion of red blood cells. Eventually, the patient was discharged home, in good condition, and on oral warfarin therapy. | {
"pile_set_name": "PubMed Abstracts"
} |
Anterior chamber flare after photorefractive keratectomy.
The inflammatory reaction produced after excimer photorefractive keratectomy (PRK) remains to be clarified. In this study, we measured flare in the anterior chamber after excimer PRK as an indirect sign of postoperative inflammation. Flare was measured in 25 eyes with a laser flare meter (Kowa FM 500) before and after excimer laser PRK. The eyes were divided in two groups: 1-week and 1-month follow-up groups. All eyes received topical 0.1% dexamethasone drops postoperatively. The 95% confidence interval for the difference in flare between the operated and fellow eyes was 3.23 +/- 1.81 at day 5 and 2.20 +/- 2.02 at day 12 after surgery in the 1-month group and 6.50 +/- 2.51 at day 2 and 2.12 +/- 0.89 day 5 after the procedure in the 1-week group, thus showing a statistically significant elevation in flare after PRK (P < 0.05). A statistically significant correlation between the depth of the stromal ablation and the flare elevation 12 days after PRK in the 1-month group was shown. There was significant increase in anterior chamber flare after PRK, although considerable individual variation occurred. | {
"pile_set_name": "PubMed Abstracts"
} |
Lung vascular transport at controlled pressures with reduced coronary flow in sheep.
This study was performed to measure the effects of sustained coronary flow reduction on lung lymph flow and protein clearance at normal and elevated lung microvascular pressures. Eleven halothane-anesthetized sheep were provided with lung lymph and carotid-to-left-anterior-descending coronary artery cannulas. Six sheep (ischemic group) were observed in a protocol of five periods, each of 2 hr duration: baseline, left atrial pressure (PLA) increased by mitral valve obstruction, return to baseline, reduced coronary flow, and reduced coronary flow plus increased PLA. Five sheep (control group) were studied in an identical protocol except that coronary flow was not reduced. PLAS were equal in the second and fifth periods. Lung lymph flow QL and protein clearance (QL times the lymph-to-plasma protein concentration ratio) normalized to second baseline were greater during ischemia than in the comparable control period, and clearance was also greater during the second increased-pressure period. We conclude that reduced coronary flow is related to sustained, significant increases in lung vascular transport at elevated as well as at normal vascular pressures. | {
"pile_set_name": "PubMed Abstracts"
} |
Discordance for skeletal and cardiac defect in monozygotic twins.
A case of monozygotic male twins discordant for skeletal and cardiac defect is reported. One twin had the hemifacial microsomia type of the oculo-auriculo-vertebral dysplasia. The cotwin had no asymmetry of the face and normal ears, but preaxial polydactyly and ventricular and auricular septal defects. The cotwins were concordant for craniostenosis with a ridge metopic suture. Karyotypes were normal. | {
"pile_set_name": "PubMed Abstracts"
} |
Triazole-bearing calixpyrroles: strong halide binding affinities through multiple N-H and C-H hydrogen bonds.
Triazole-bearing calixpyrroles (TCPs) were synthesized as artificial anion binding receptors. The additional C-HX hydrogen bonding interaction induced strong binding affinity towards halide ions. Using this strong binding affinity, Cl- was successfully extracted from the aqueous to organic phase. | {
"pile_set_name": "PubMed Abstracts"
} |
Distribution of enantiomers of methadone and its main metabolite EDDP in human tissues and blood of postmortem cases.
Knowledge concerning the distribution of methadone in postmortem human tissue and the effect of postmortem redistribution on methadone is today limited making the choice of a suitable substitute for femoral blood difficult when this is not available. Cardiac blood, femoral blood, muscle, and brain tissue concentrations of the enantiomers of methadone and its metabolite 2-ethyl-1,5-dimethyl-3,3-diphenylpyrrolinium were recorded for 155 postmortem cases. Brain and muscle tissue concentrations exceeded the femoral blood concentrations with a median fold of 2.3 and 1.6, respectively, but both had a better correlation than cardiac blood to femoral blood concentrations. The Kruskal-Wallis test showed a significant dependency on time and body mass index for some of the matrix ratios over femoral blood. We conclude brain or muscle tissue may constitute a better alternative for measurement of methadone than cardiac blood for situations in which femoral blood is not available, despite concentrations in both matrices being systematically higher. | {
"pile_set_name": "PubMed Abstracts"
} |
Serum NT-proBNP in the early detection of doxorubicin-induced cardiac dysfunction.
Cardiac dysfunction is a major limitation of anthracycline treatment in cancer patients. There are several useful serum markers in other types of cardiomyopathy, including N-terminal pro-brain-natriuretic peptide (NT-proBNP), troponin-T and creatine kinase MB isoform. We investigated the potential application of these serum biomarkers in cancer patients receiving treatment with anthracycline. We collected data from 52 female breast cancer patients receiving doxorubicin and cyclophosphamide every 3 weeks for four cycles. Cardiac function evaluations by echocardiography were done at baseline and at the end of the fourth cycle of chemotherapy. Patients' blood samples were serially measured for cardiac biomarkers. The mean cumulative dose of doxorubicin in this study was 237 mg/m(2) . No symptomatic heart failure was detected during the study period. However, there were significant asymptomatic reductions of left ventricular ejection fraction (LVEF) from mean ± SD 70.7 ± 6% at baseline to 67.0 ± 5% (P < 0.001). By clinical toxicity criteria the LVEF decline was grade I in 18% and grade II in 4%. After one dose of chemotherapy, a significant rise of serum NT-proBNP occurred in patients who subsequently developed an LVEF reduction compared with patients with normal LVEF (P = 0.04). A correlation analysis demonstrated that the reduction of fractional shortening was significantly associated with elevated NT-proBNP (r = -0.016, P = 0.014). Asymptomatic reductions in cardiac function are common in breast cancer patients treated with doxorubicin. NT-proBNP may serve as a convenient serum biomarker for the early detection of cardiotoxicity induced by anthracycline. | {
"pile_set_name": "PubMed Abstracts"
} |
Osteogenic sarcoma associated with Diamond-Blackfan anemia: a report from the Diamond-Blackfan Anemia Registry.
Diamond-Blackfan anemia (DBA) is a congenital pure red cell aplasia, usually presenting in infancy or early childhood. A review of the literature strongly supports a predisposition to hematopoietic malignancy. Recently, solid tumors have been reported, some attributable to hemosiderosis and/or androgen therapy. Two cases of osteogenic sarcoma have also been documented. An analysis from the Diamond-Blackfan Anemia Registry was performed to evaluate the cancer risk in patients with DBA. The Diamond-Blackfan Anemia Registry of North America (DBAR) is a comprehensive database of patients with DBA enrolled, after informed consent, through outreach to pediatric hematologists and family groups. The patients and/or their families complete a detailed questionnaire, and a review of medical records and telephone interviews are performed to complete and clarify the information provided. Of the 354 patients registered in the DBAR, there were six patients meeting the accepted diagnostic criteria for DBA who were found to have malignancies. Three patients had osteogenic sarcoma diagnosed, one with myelodysplastic syndrome, one with colon carcinoma, and one with a soft tissue sarcoma. There appears to be an association of osteogenic sarcoma with DBA. A young age at presentation may be a feature of DBA-associated osteogenic sarcoma. Because of the immaturity of the database, the actuarial risk for osteogenic sarcoma and other cancers in individuals with DBA cannot be ascertained. Speculation is made regarding the nature of the molecular defect leading to the association of DBA and osteogenic sarcoma. | {
"pile_set_name": "PubMed Abstracts"
} |
Perioperative Consultation for Patients with Preexisting Neurologic Disorders.
As the population ages, the prevalence of many neurologic diseases is increasing. At the same time, older patients are undergoing more surgical procedures. This confluence of events puts neurohospitalists in a unique position to provide both pre- and postoperative guidance to minimize complications, improve clinical outcomes, and decrease health care costs in patients with neurologic comorbidities. Early preoperative consultation is recommended for patients with severe, poorly controlled, or decompensated neurologic disease, a recent stroke, or those undergoing procedures with a high risk of neurologic complications. The neurohospitalist's role includes optimizing management of preexisting diseases, such as epilepsy, neuromuscular disorders, Parkinson's disease, dementia, and cerebrovascular disease, as well as providing guidance for perioperative management and clarification of risks. In the postoperative period, the neurohospitalist will frequently be consulted to mitigate any negative impact of neurologic complications that do occur. | {
"pile_set_name": "PubMed Abstracts"
} |
[Lectin arthritis--a new arthritis model].
By single intraarticular injection of lectin from Lens culinaris in nosenitized rabbits acute and chronic arthritis was produced. By use of fluoresceinisothiocyanate-labelled lectin binding of lectin could be demonstrated in the connective tissue of joint capsule for 4 weeks. The morphological features of lectin-arthritis were described. The results are discussed with respect to the pathogenesis of the arthritis. | {
"pile_set_name": "PubMed Abstracts"
} |
Overweight among refugee children after arrival in the United States.
We determined the impact of 69 African refugee children's arrival age and weight on subsequent weight gain by following BMI of refugee children. During 6-24 months after arrival in the U.S., 57% of underweight children became normal weight, whereas only 2% of normal weight children moved to the next higher weight category (p<.001). Children with overweight or those at-risk for overweight on arrival were more likely to be overweight on follow-up than were children who were not at risk or overweight on arrival (OR 18.9, 95% CI 3.2-112) Despite the tendency of catch-up weight gain of children underweight at arrival, BMI at arrival did not predict the slope of BMI change over time. Children who are overweight at arrival are more likely to remain at risk of overweight. The younger cohort experienced an increase in BMI at a slower rate than the older cohorts. | {
"pile_set_name": "PubMed Abstracts"
} |
"Yes", "No" or "Yes, but"? Multinomial modelling of NICE decision-making.
The National Institute for Health and Clinical Excellence (NICE) issues mandatory guidance on health technologies to the UK NHS, based on clinical evidence, cost-effectiveness and other considerations. However, the exact factors considered, their relative importance and tradeoffs between them are not made explicit. Previous research modelled NICE decisions as a binary choice (accept/reject) dependent on cost-effectiveness, amongst other variables. This paper proposes and tests an alternative model of decision-making that may better represent the "yes, but..." nature of many NICE decisions. Decisions were categorised as "recommended for routine use", "recommended for restricted use" or "not recommended". The NICE appraisal process was modelled as a single decision between the three categories. Multinomial logistic regression techniques were used to evaluate the impact of: quantity/quality of clinical evidence; cost-effectiveness; decision date; existence of alternative treatments; budget impact; technology type. Results suggest that interventions supported by more randomised trials are more likely to be recommended and endorsed for routine use. Higher cost-effectiveness ratios increased the likelihood of interventions being rejected rather than recommended for restricted use but did not significantly affect the decision between routine and restricted use. Pharmaceuticals, interventions appraised early in the NICE programme and those with more systematic reviews were also less likely to be rejected, while patient group submissions made a recommendation for routine rather than restricted use more likely. The presence of factors affecting the decision between routine and restricted use but not that between routine use and rejection suggests that modelling these three outcomes reflects NICE decision-making more closely than binary-choice analyses. | {
"pile_set_name": "PubMed Abstracts"
} |
Peri-operative morbidity and fertility outcome after repeat abdominal myomectomy for large fibroid uterus.
This was a retrospective cohort study evaluating peri-operative morbidity of 66 women who underwent repeat abdominal myomectomy compared with 200 women who had primary myomectomy in the same period, matched for age and uterine size. We report the reproductive outcome of women seeking fertility after repeat myomectomy. More pre-operative GnRH analogues were used and midline abdominal skin incision performed in the repeat myomectomy group. The likelihood of major complication was three times higher in the repeat abdominal myomectomy group (OR 3.0, 95% CI 1.67-5.5, p < .001). There was a significantly longer mean hospital stay (p < .01), higher incidence of bleeding (p < .01) and urinary or wound infection (p < .01) in the repeat abdominal myomectomy group. Of the 47 women who had repeat myomectomy for fertility reasons, six women conceived and two live birth at term (4%). Our study highlights the significant peri-operative morbidity and poor subsequent live birth rate associated with repeat abdominal myomectomy. Impact statement What is already known on this subject? Repeat abdominal myomectomy is a major surgical procedure with significant morbidity. However, abdominal myomectomy for large fibroid uterus remains the preferred treatment method for women who wish to preserve fertility. Sufficient evidence related to the peri-operative morbidity and fertility outcome after repeat abdominal myomectomy is lacking. What do the results of this study add? This is the largest study reporting peri-operative morbidity and pregnancy outcome following repeat abdominal myomectomy. Our results highlight the three times increased risk of major complications associated with repeat abdominal myomectomy compared to primary myomectomy with the poor subsequent live birth rate. What are the implications of these findings for clinical practice and/or further research? Our study complements the sparse existing data on the outcome of repeat abdominal myomectomy and underscore the potentially significant peri-operative morbidity and poor subsequent live birth rate associated with the procedure. This information should be used in counselling women with fibroid recurrence after primary myomectomy before they embark on repeat surgery. | {
"pile_set_name": "PubMed Abstracts"
} |
Regulatory aspects of genetic research with residual human tissue: effective and efficient data coding.
In a large retrospective cohort of breast cancer patients, BRCA1 and BRCA2 germline mutations were analysed in DNA isolated from residual paraffin-embedded tissue samples. Because it was not feasible to ask individual for informed consent, a data and DNA coding protocol, based on the Dutch 'Code of Conduct', was developed. The corner stone of the protocol is that a trusted third party, in our case a notary, keeps the coding keys of clinical data and DNA. Because (re)linkage of the combined coded clinical and genotyping data (BRCA1/2) is only possible through the notary's keys, these can be considered to be comparable to anonymised data at the level of the researcher. Issues around retrospective genotyping of allegedly high-risk mutations and the coding procedure itself are discussed. Our protocol is an appropriate solution to safeguard the privacy of patients when using residual tissue or DNA of patients. Importantly, the coding procedure also allows re-linkage of new genotyping data or extended patient follow-up data to the valuable coded dataset. | {
"pile_set_name": "PubMed Abstracts"
} |
Oxytocin is not involved in luteolysis and early maternal recognition of pregnancy (MRP) in alpacas.
Pregnancy maintenance depends on the maternal recognition of pregnancy (MRP), a physiological process by which the lifespan of the corpus luteum is prolonged. This mechanism is not well characterized in camelids. The objectives of the present research were to determine if exogenous oxytocin prolongs the corpus luteum activity in alpacas and to evaluate expression and localization of oxytocin receptors within the endometrium at 9 and 14days post-mating. In the oxytocin studies, plasma progesterone profiles were determined after ovulation in the same alpacas on 2 cycles: one cycle without oxytocin treatment and one cycle with oxytocin treatment. Oxytocin was administered daily by intramuscular injections (IM) at a dose of 20IU (experiment 1, n=6) or 60IU (experiment 2, n=7 from day 3 through day 10 after induction of ovulation with GnRH IM. There was no significant difference in the length of the luteal phase (i.e. corpus luteum lifespan) between the treated and control cycles using either 20 or 60IU of oxytocin. In the final experiment, uteri from open and pregnant alpacas (n=4 per group) at 9 and 14days post-mating were evaluated for expressions of oxytocin receptors by immunohistochemistry. No significant difference (P≤0.05) in the expression of oxytocin receptors was observed between open and pregnant animals in either staining intensity or tissue localization. We conclude that oxytocin is not involved in luteolysis and early MRP in alpacas. | {
"pile_set_name": "PubMed Abstracts"
} |
Heparin-induced thrombocytopenia causing graft thrombosis and bowel ischemia postendovascular aneurysm repair.
Heparin-induced thrombocytopenia (HIT) is an immune-mediated thrombocytopenia resulting from prior heparin exposure. It can be associated with limb- or life-threatening thrombotic events. Patients undergoing any vascular procedures including endovascular procedures that require heparin administration are at risk. There is very little reported in the literature with regards to thrombosis associated with HIT after endovascular aortic aneurysm repair. All reported cases of HIT thrombosis presented as acute arterial lower limb ischemia or deep vein thrombosis. In this report, we present a case of HIT complicated by stent graft thrombosis and bowel ischemia. | {
"pile_set_name": "PubMed Abstracts"
} |
GENOTYPIC VARIATION AND CLONAL STRUCTURE IN CORAL POPULATIONS WITH DIFFERENT DISTURBANCE HISTORIES.
Genotypic diversity in six populations of the endemic Hawaiian reef coral, Porites compressa, was directly related to habitat-disturbance history. The highest diversity (lowest amount of clonal proliferation) was found in populations that had been intensely or recently disturbed. In these populations, space was not limited and mean colony size was small (< 500 cm2 ), suggesting early stages of recolonization. In an undisturbed, protected habitat, lower genotypic diversity was a result of a significant degree of clonal replication of established genotypes. Unoccupied substratum was rare in this habitat, and average colony size was large (> 2500 cm2 ). Populations in intermediately disturbed habitats showed intermediate levels of diversity and clonal structure as a result of the combined contributions of sexual and asexual reproduction. Individual clones were distributed over small areas (< 4 m2 ) or distances (< 1 m) in young populations, and more broadly (> 256 m2 ) and over longer distances (> 90 m) in the older, undisturbed population. Interpretations of life-history parameters and estimates of total genetic variability in species that have the potential to reproduce asexually are dependent upon an assessment of the overall clonal structure of populations. The power of genotypic assays to reliably detect clonal versus unique colonies, as well as the spatial scales over which clonal populations are sampled, are critical to such assessments. | {
"pile_set_name": "PubMed Abstracts"
} |
Supramolecular Assembly of Photosystem II and Adenosine Triphosphate Synthase in Artificially Designed Honeycomb Multilayers for Photophosphorylation.
Plant thylakoids have a typical stacking structure, which is the site of photosynthesis, including light-harvesting, water-splitting, and adenosine triphosphate (ATP) production. This stacking structure plays a key role in exchange of substances with extremely high efficiency and minimum energy consumption through photosynthesis. Herein we report an artificially designed honeycomb multilayer for photophosphorylation. To mimic the natural thylakoid stacking structure, the multilayered photosystem II (PSII)-ATP synthase-liposome system is fabricated via layer-by-layer (LbL) assembly, allowing the three-dimensional distributions of PSII and ATP synthase. Under light illumination, PSII splits water into protons and generates a proton gradient for ATP synthase to produce ATP. Moreover, it is found that the ATP production is extremely associated with the numbers of PSII layers. With such a multilayer structure assembled via LbL, one can better understand the mechanism of PSII and ATP synthase integrated in one system, mimicking the photosynthetic grana structure. On the other hand, such an assembled system can be considered to improve the photophosphorylation. | {
"pile_set_name": "PubMed Abstracts"
} |
Altered bone and mineral metabolism in patients receiving imatinib mesylate.
Imatinib mesylate inhibits several tyrosine kinases, including BCR-ABL, the C-KIT receptor, and the platelet-derived growth factor receptors alpha and beta, all of which are associated with disease. We observed that hypophosphatemia developed in some patients with either chronic myelogenous leukemia or gastrointestinal stromal tumors who were receiving imatinib. We identified 16 patients who had low serum phosphate levels and 8 patients who had normal serum phosphate levels, all of whom were receiving imatinib. We performed the following biochemical measurements: whole-blood levels of ionized calcium, plasma levels of intact parathyroid hormone, and serum levels of total calcium, phosphate, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D, magnesium, and markers of bone formation (bone alkaline phosphatase and osteocalcin) and bone resorption (N-telopeptide of collagen cross-links); urinalysis; and phosphate, calcium, and creatinine levels in "spot" urine specimens. Patients in the low-phosphate group (median serum phosphate level, 2.0 mg per deciliter [0.6 mmol per liter]; normal level, >2.5 mg per deciliter [0.8 mmol per liter]) had elevated parathyroid hormone levels and low-to-normal serum calcium levels, were younger, and were receiving a higher dose of imatinib than patients in the normal-phosphate group (median level, 3.2 mg per deciliter [1.0 mmol per liter]). Both groups had high levels of phosphate excreted in the urine and markedly decreased serum levels of osteocalcin and N-telopeptide of collagen cross-links. Hypophosphatemia, with associated changes in bone and mineral metabolism, develops in a proportion of patients taking imatinib for either chronic myelogenous leukemia or gastrointestinal stromal tumors. The drug may inhibit bone remodeling (formation and resorption), even in patients with normal serum phosphate levels. | {
"pile_set_name": "PubMed Abstracts"
} |
Endovascular Treatment for Acute Type B Aortic Dissection Involving a Right-sided Aortic Arch and Kommerell's Diverticulum: A Case Report and Review of the Literature.
Aortic dissection involving a right-sided aortic arch (RAA) associated with Kommerell's diverticulum is extremely rare and remains a complicated entity for surgical therapy because of its anatomical characteristics. Fewer than 40 cases have been reported in the English language literature to date. We reported a case of 69-year-old male patient who presented with acute type B aortic dissection involving an RAA associated with Kommerell's diverticulum, a stent-graft was accurately deployed and embolization of the left subclavian artery. In addition, a review of the literature was performed to examine its clinical presentation and the efficacy of management strategies. One year follow-up showed positive aortic remodeling with exclusion of Kommerell's diverticulum and thrombosis of the false lumen. An aortic dissection involving an RAA associated with Kommerell's diverticulum is an extremely rare condition. Endovascular therapy is technically feasible when the dissection involves this unusual vascular malformation. | {
"pile_set_name": "PubMed Abstracts"
} |
A highly sensitive microRNA biosensor based on ruthenium oxide nanoparticle-initiated polymerization of aniline.
Well-defined voltammetric current peaks of polyaniline were observed at biosensors hybridized with ruthenium oxide nanoparticle-tagged microRNAs and incubated in a mixture of aniline/H(2)O(2), which can be used for direct microRNA expression profiling with excellent sensitivity. | {
"pile_set_name": "PubMed Abstracts"
} |
Cell-mediated immunity and postexposure protection from rabies by inactivated vaccines of tissue culture origin.
A strong cell-mediated cytotoxic response (CMC), which was maximal 6-7 days after treatment, was generated in mice exposed to inactivated rabies virus vaccine. CMC response was linear and was a function of antigenic mass. Live attenuated viruses also generated a strong CMC response after intracerebral infection. Mice lethally infected with virulent strains of virus failed to develop CMC. There was, however, no difference in the rate and amount of virus-neutralizing or lytic antibodies and interferon induction in mice infected with virulent as compared to those infected with attenuated strains of virus. The level of T-cell effector function was found to be directly correlated with survival. Secondary CMC response to inactivated virus vaccine is strong, appears faster (3 days)and requires a smaller amount of antigen than does the primary CMC response. A consistent high level of CMC can be maintained for extended periods of time by repeated vaccine inoculations. When mice were treated with vaccine after being infected with street virus, high levels of CMC were found in effectively protected animals, but no CMC was found in unprotected animals. High levels of virus-neutralizing antibody were present in both surviving and dying mice. CMC responses to different antigenic components of rabies virus were also investigated. | {
"pile_set_name": "PubMed Abstracts"
} |
[Experimental studies on effects of zinc and germanium on immune function and anti-oxidation in mice].
Zinc and germanium concentrations in serum, liver and muscle of mice, T-lymphocyte subgroup proportion, serum superoxide dismutase (SOD) activity and malonodialdehyde (MDA) were determined to study whether there exist synergism or antagonism between zinc and germanium. Results showed there existed, to certain extent, competitive effects of serum zinc and germanium in mice. When concentration of serum zinc increased, that of germanium decreased, or vise versa. There existed certain relationship between zinc and germanium concentrations in serum and those in muscle and liver of mice, and between those and CD3 count and SOD activity. Immune function in mice was influenced and their T-lymphocyte subgroup proportion changed with changes in serum zinc and germanium concentrations. With increased germanium and decreased zinc serum concentrations, CD3 and CD1 counts decreased, CD8 count unchanged, and the ratio of CD1 to CD3 decreased, which showed certain antagonist effects of them as they operated together. But, no antagonism was observed in their anti-oxidant effects, SOD activity increased to varied extent, and the level of MDA decreased. | {
"pile_set_name": "PubMed Abstracts"
} |
Time ordering of gene coexpression.
Temporal microarray gene expression profiles allow characterization of gene function through time dynamics of gene coexpression within the same genetic pathway. In this paper, we define and estimate a global time shift characteristic for each gene via least squares, inferred from pairwise curve alignments. These time shift characteristics of individual genes reflect a time ordering that is derived from ob- served temporal gene expression profiles. Once these time shift characteristics are obtained for each gene, they can be entered into further analyses, such as clustering. We illustrate the proposed methodology using Drosophila embryonic development and yeast cell-cycle gene expression profiles, as well as simulations. Feasibility is demonstrated through the successful recovery of time ordering. Estimated time shifts for Drosophila maternal and zygotic genes provide excellent discrimination between these two categories and confirm known genetic pathways through the time order of gene expression. The application to yeast cell-cycle data establishes a natural time order of genes that is in line with cell-cycle phases. The method does not require periodicity of gene expression profiles. Asymptotic justifications are also provided. | {
"pile_set_name": "PubMed Abstracts"
} |
A review of orthodontic bond failure using a chemical cure adhesive.
Orthodontic treatment involves the direct bonding of brackets to the tooth surface. These bonds should survive until the end of active treatment. The objective of this study was to clinically determine the frequency and bond failure pattern at the orthodontic clinic in the Lagos University Teaching Hospital, (LUTH) within a two-year period. A total of 1926 stainless steel Roth .022 brackets (Ultraminitrim Dentaurum, Germany) in 113 patients were bonded using Rely-a-bond No-mix Adhesive (Reliance Orthodontic Products Inc., U.S.A.) over a two-year period. The effects of age, gender, arch location and position of the tooth in the arch on failure rate were evaluated. The mean time to first bond failure was also determined. A failure rate of 24.1% was recorded. The mean age at onset of treatment was 18.08 years. There was female preponderance with a male to female ratio of 1:3. The failure rate in males was 26.2% and in females 23.4%. The failure rates among the different age groups are as follows; 6-11 years 30.7%, 12-17 years 36.2%, 18-25 years 10.2%, 26 and above years 9.1%. The failure rate was significantly higher in the mandibular teeth and teeth in the posterior location of the arch. Out of 1926 bonded brackets there was a failure rate of 24.1% with a higher rate of failure in the younger age group, mandibular teeth and teeth in the posterior location of the arch. | {
"pile_set_name": "PubMed Abstracts"
} |
The resistance of Pseudomonas aeruginosa to chloramphenicol.
A strain of Pseudomonas aeruginosa, which was resistant to 400 mug/ml of chloramphenicol (CM), was isolated. The generation time of the resistant strain was the same in the presence or absence of CM and similar to that of the parent strain growing in the absence of chloramphenicol. Resistance is eliminated by treatment with acridine dyes, mitomycin C, and sodium dodecyl sulfate, suggesting that resistance may be expressed by a plasmid. The resistant strain does not produce the pigment pyocyanine and the addition of pyocyanine to this strain eliminates the resistance factor. A strain sensitive to CM was isolated. This strain does not produce the enzyme acetyl CoA : chloramphenicol transacetylase whereas the resistant strain does. The sensitive strain accumulates 14C-CM at a greater rate and to a greater extent than the resistant strain grown in the presence of CM. The results suggest that the resistant strain inactivates CM by acetylation and, in.addition, develops a "permeability" barrier towards chloramphenicol. | {
"pile_set_name": "PubMed Abstracts"
} |
Case control study of hypospadias, based on registry information.
With the aid of data in the Swedish Medical Birth Registry for infants with hypospadias and controls, a number of variables were compared. Records of infants born in 1982-1983 (188 cases and 376 matched controls) contained information on involuntary infertility, previous spontaneous and induced abortions, use of oral contraceptives or a remaining IUD at conception, smoking in early pregnancy, occupation in early pregnancy, family situation, and diagnoses given during pregnancy and at delivery, including information on caesarean section and vacuum extraction. Among all variables studied, only one group of statistically significant differences appeared: women whose sons had hypospadias more often than controls had a diagnosis of weak contractions, a higher rate of induced deliveries, and also a higher rate of caesarean sections. The finding of a higher caesarean section rate in infants with hypospadias was verified in a separate study of 1,736 hypospadic infants delivered in 1973-1981 and compared with all births in Sweden during that period. No difference in the rate of vacuum extractions was seen. This finding is interpreted as a result of an abnormality of the fetal-placental-maternal organism interaction, perhaps also disturbing the early pregnancy and increasing the risk for hypospadias. | {
"pile_set_name": "PubMed Abstracts"
} |
Effect of endodontic access cavity preparation on monolithic and ceramic veneered zirconia restorations.
Due to the high chipping rates observed in veneered zirconia ceramic restorations, the use of monolithic zirconia restorations has been recommended. This study tried to compare veneered and monolithic zirconia fixed dental prostheses (FDPs) with respect to the amount of damage induced by endodontic access preparation. Monolithic and ceramic veneered (n = 10) three-unit restorations (retainers: first premolar and first molar; pontic: second premolar) were subject to endodontic access cavity preparation in both retainers using a diamond rotary instrument under continuous water cooling. The number of chipping fractures and microfractures detected using the fluorescent penetrant method were recorded. Statistical analysis was based on Wilcoxon rank sum tests with Bonferroni correction (level of significance α = .05). Only one microfracture could be identified in the group of monolithic FDPs while a maximum of seven microfractures and three chipping fractures per retainer crown were recorded in the group of veneered restorations. At the premolar site, the veneered restorations showed significantly more microfractures (P = .0055) and chipping fractures (P = .0008). At the molar site, no significant difference with respect to microfractures could be detected (P = .0767), while significantly more chipping fractures occurred in the veneered samples (P = .0293). Monolithic zirconia restorations seem to be less susceptible to damage when endodontic access cavities have to be prepared as compared to veneered zirconia reconstructions. However, no conclusions can be drawn on the long-term performance of a specific restoration based on this study. | {
"pile_set_name": "PubMed Abstracts"
} |
Appetite for Neurogenesis.
Adult neural stem cells (NSCs) in the ventricular-subventricular zone (V-SVZ) produce diverse olfactory bulb (OB) neurons. In a recent paper in Science, Paul et al. (2017) show that hypothalamic propiomelanocortin (POMC) neurons innervate the anterior ventral V-SVZ and regulate deep granule interneuron production depending on feeding behavior. | {
"pile_set_name": "PubMed Abstracts"
} |
Tamoxifen-induced increase in the potential doubling time of MCF-7 xenografts as determined by bromodeoxyuridine labeling and flow cytometry.
The anti-estrogen tamoxifen (TAM) is widely used in the therapy of human breast cancer. Shown to induce a G1 transition delay in vitro, the kinetic effects of TAM on breast carcinoma cells growing as tumor xenografts in nude mice have been less well characterized. In this study, we demonstrate a significant increase in the tumor potential doubling time (Tpot) and decrease in the labeling index (%LI) of estradiol (E2)-stimulated MCF-7 xenografts following TAM treatment or E2 deprivation. MCF-7 tumor pieces were transplanted s.c. into nude mice supplemented with Silastic capsules containing E2. After 2-4 weeks, animals were randomized to continued E2 treatment, E2 and TAM treatment, or E2 deprivation. At times ranging from 0 to 23 days after treatment, animals were given injections of bromodeoxyuridine and tumors excised for kinetic analysis. Using flow-cytometric techniques, the Tpot and %LI were estimated for all tumors. Seven independent experiments were performed and data pooled for statistical analysis. At the time of hormonal manipulation, E2-stimulated tumors had a volume doubling time of 5 days, a Tpot of 2.3 days, and a %LI of 23%. Continued E2 treatment resulted in only minimal changes in Tpot and %LI over the remainder of the observation period. Treatment with TAM resulted in a slowing of tumor growth (tumor doubling time, 12 days), a significant (P < 0.001) increase in Tpot to 6.6 days, and a decrease in %LI to 8% by 23 days posttreatment. E2 deprivation resulted in a cessation of tumor growth and similar changes in Tpot and %LI to 5.3 days and 10%, respectively (P < 0.001). In contrast to previous reports, these data demonstrate that TAM treatment and E2 deprivation both significantly decrease tumor cell proliferation in MCF-7 xenografts. | {
"pile_set_name": "PubMed Abstracts"
} |
Peer reviewed: will risk-based cleanup work at navy facilities?
Process requirements include attention to long-term risk, public involvement, enforcement, and use of uncertainty analysis. | {
"pile_set_name": "PubMed Abstracts"
} |
Microprocessor system for tracking isodensity lines in film dosimetry.
Using a microprocessor a method for plotting isodensity lines in film dosimetry is described. The procedure moves the measuring spot directly along an isodensity line, using information obtained in preceding steps to determine the next step. For registration of the curves no X-Y pen recorder is needed. The essentials of the procedure together with a flowchart are given. | {
"pile_set_name": "PubMed Abstracts"
} |
Enzymatic cross-linking of a nanofibrous peptide hydrogel.
The rheological properties of the environment in which a cell lives play a key role in how the cells will respond to that environment and may modify cell proliferation, morphology and differentiation. Effective means of modifying these properties are needed, particularly for peptide hydrogels which are generally relatively weak and soft. In this report we describe the enzymatic cross-linking of a nanofibrous multidomain peptide hydrogel. When this method was used, the storage modulus, G', could be increased to over 4000 Pa without changes in hydrogel concentration and without dramatic changes in nanostructural architecture. Enzymatic cross-linking represents a mild and simple method for increasing the mechanical strength of peptide hydrogels in applications for which the robustness of the gel is essential. This method should be suitable for a broad array of peptide hydrogels containing lysine such as those currently under study by many different groups. | {
"pile_set_name": "PubMed Abstracts"
} |
The effect of perinatal factors on cord thyroxine concentration.
Cord blood thyroxine (T4) concentrations were measured in 4,068 infants from 28 wk gestation to term. Each chart was reviewed for the following factors: delivery by cesarean section, prolonged rupture of membranes, neonatal asphyxia, meconium-stained amniotic fluid, maternal diabetes mellitus and twinning. Each neonate was evaluated for the Idiopathic Respiratory Distress Syndrome, and low (SGA) or high (LGA) birthweight for gestational age. Within each gestational age group, the mean cord T4 value was similar except for a significantly lower mean cord T4 concentration for the term SGA subgroup. Thus, inclusion of the infant with a complicated neonatal course or the infant born to a high-risk mother in mass screening programs for congenital hypothyroidism using cord serum will not increase the number of false-positive T4 values. | {
"pile_set_name": "PubMed Abstracts"
} |
Parallel analysis of two analytes in solutions or on surfaces by using a bifunctional aptamer: applications for biosensing and logic gate operations.
A bifunctional aptamer that includes two aptamer units for cocaine and adenosine 5'-monophosphate (AMP) is blocked by a nucleic acid to form a hybrid structure with two duplex regions. The blocked bifunctional aptamer assembly is used as a functional structure for the simultaneous sensing of cocaine or AMP. The blocked bifunctional aptamer is dissociated by either of the two analytes, and the readout of the separation of the sensing structure is accomplished by a colorimetric detection, by a released DNAzyme, or by electronic means that use Faradaic impedance spectroscopy or field-effect transistors. In one configuration, the blocked bifunctional aptamer structure is separated by the substrates cocaine or AMP, and the displaced blocker units act as a horseradish peroxidase-mimicking DNAzyme that permits the colorimetric detection of the analytes. In the second system, the blocked bifunctional aptamer hybrid is associated with a Au electrode. The displacement of the aptamer by any of the substrates alters the interfacial electron transfer resistance at the electrode surface, thus providing an electronic signal for the sensing process. In the third configuration, the blocked aptamer hybrid is linked to the gate of a field-effect transistor device. The separation of the complex by means of any of the analytes, cocaine, or AMP alters the gate potential, and this allows the electronic transduction of the sensing process by following the changes in the gate-to-source potentials. The different systems enable not only the simultaneous detection of the two analytes, but they provide a functional assembly that performs a logic gate "OR" operation. | {
"pile_set_name": "PubMed Abstracts"
} |
Central nervous system metastasis of a cutaneous epitheliotropic lymphosarcoma in a dog.
This report describes an uncommon case of a cutaneous epitheliotropic T-cell lymphosarcoma with central nervous system (CNS) manifestations in a 9-year-old mixed breed German shepherd dog. The animal had a history of sudden blindness, pyrexia and multifocal areas of hyperaemia in the oral mucosa. A biopsy from the muco-cutaneous junction of the lips led to the diagnosis of an epitheliotropic lymphosarcoma and the animal was humanely destroyed. At necropsy, hyperaemia in the oral mucosa was no longer detectable. In the brain, a mass effacing the optic chiasm and invading the hypothalamic area was found; histological examination revealed lymphoid tumour cell infiltration. In the epithelium of the oral mucosa, intra-epithelial lymphoid tumour cells, sometimes arranged in small clusters (Pautrier's microabscesses), in combination with a mild inflammation in the superficial dermis were observed. Skin and brain tumour cells expressed CD3 antigen, indicating their T-cell origin. This is, to our knowledge, the first report of a cutaneous epitheliotropic lymphosarcoma with CNS metastasis in a dog. | {
"pile_set_name": "PubMed Abstracts"
} |
Development of a joint mental-health and drug health assessment unit and short-stay unit.
There is emerging interest in models of care that focus on assessment and brief inpatient treatment (two to three days) including psychiatric emergency care centre units and short-stay units in Australia. We present the development of a functionally integrated Missenden Assessment Unit and six-bed short-stay unit in the new Professor Marie Bashir Centre at Royal Prince Alfred Hospital in inner-city Sydney. The focus was on collaboration between emergency, drug and alcohol and mental-health services in developing the short-stay unit and Missenden Assessment Unit with joint admission and resource use. We outline the models of care and findings from the 2016 evaluation following the initial two years of operation and consider ongoing challenges. The Missenden Assessment Unit provides an alternative point of presentation for mental-health drug and alcohol patients. The short-stay unit provides coordinated, therapeutic interventions. The Missenden Assessment Unit/short-stay unit reduced the burden of presentations to the emergency department while providing the opportunity for training and collaboration. Further refinement of the models of care should occur with policy development and via research. | {
"pile_set_name": "PubMed Abstracts"
} |
Statin reduces mortality and morbidity in systemic lupus erythematosus patients with hyperlipidemia: A nationwide population-based cohort study.
The anti-inflammatory and cardiovascular protective effects of statin for patients with systemic lupus erythematosus (SLE) are not clear. We tested the hypothesis that statin use is associated with reduced mortality and morbidity in SLE patients with hyperlipidemia. We included 4095 patients with SLE and hyperlipidemia from the entire population using the Taiwan National Health Insurance Research Database between 1997 and 2008. A total of 935 matching sets (1:2) of patients who had never used lipid-lowering medications and statin users were included in the nested matched cohort. Cox proportional hazards regression was used to calculate the hazard ratios (HR) and 95% confidence intervals (CI) for the association between statin and all-cause mortality, coronary artery disease (CAD), cerebrovascular disease (CVD) and end-stage renal disease (ESRD), conditional for matching sets in the matched cohort. The multivariate adjusted hazard ratios (HR) for statin users, as compared with patients had never used lipid-lowering medications, were 0.67 (95% CI, 0.54 to 0.83) for death from any cause. High-dose statins (>365 cumulative defined daily dose) significantly reduced risk of all-cause mortality (HR 0.44, 95% CI 0.32 to 0.60); CAD (HR 0.20, 95% CI 0.13 to 0.31); CVD (HR 0.14, 95% CI 0.08 to 0.25); and ESRD (HR 0.22, 95% CI, 0.16 to 0.29), with similar results in the nested matched study. Statin therapy in SLE patients with hyperlipidemia may reduce the risk of mortality, cardiovascular disease and ESRD. The effect of statins needs to be demonstrated in large prospective studies with long-term follow-up. | {
"pile_set_name": "PubMed Abstracts"
} |
Curcumin protects against tartrazine-mediated oxidative stress and hepatotoxicity in male rats.
Synthetic dyes have been reported to exert detrimental effects on the health of humans. This study evaluated the effects of a diet containing tartrazine (Tz) on rats which included: i) biochemical parameters including hepatic enzymes, kidney functions and profiles of lipids; ii) markers of oxidative stress in cells by measuring concentrations of malondialdehyde (MDA) and glutathione (GSH); iii) activities of selected, key hepatic antioxidant enzymes including catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPx); iv) pathologies of liver. Also, protective effects of three doses of curcumin (CUR), a natural food coloring agent, on these parameters in rats that had been co-exposed to Tz. Fifty Wistar male albino rats were randomly divided into five groups: Group I, control, where rats were fed a normal diet; Group II, rats were fed normal diets containing 7.5 mg Tz/kg diet, dry mass (dm); In Groups III, IV and V, rats were fed diets containing Tz plus 1.0, 2.0 or 4.0 g CUR/kg diet, dm, respectively. Whole blood was collected after 90 d of exposure, homogenates of liver were prepared and the above analyses were conducted. Exposure to Tz in the diet caused statistically significant (p<0.05) greater concentrations of lipids, hepatic enzymes, and kidney function parameters as well as the indicator of oxidative stress MDA. Alternatively, activities of several antioxidant enzymes (i.e. CAT, SOD and GPx) and concentration of the substrate GSH, an indicator of non-enzymatic antioxidant capability, were significantly (p<0.05) less than those in control rats not exposed to Tz. Tz caused various histopathological changes in livers of rats, which were characterized by hemorrhage and dilatation of the central vein and sinusoids, hepatocyte necrosis, intracellular vacuolization. Co-administration of 2.0 (Group IV) or 4.0 g CUR/kg diet (Group V) with Tz significantly mitigated effects on functions of liver and kidney and the profile of relative concentrations of lipids. CUR significantly (p<0.05), and almost completely, reversed effects on enzymatic and non-enzymatic antioxidant and indicators of oxidative stress about rats fed Tz (Group II) to values in control rats. However, co-administration of 1.0 g CUR with Tz (Group III) exhibited a negligible effect on those parameters. The results of this study suggest benefits of the use of CUR, as a promising natural food additive to counteract oxidative stress caused by dietary exposure to the synthetic dye Tz due to potent protective antioxidant activity. Blending some natural food additives, such as CUR with diets containing synthetic dyes, could moderate potential effects of these artificial dyes. Decreasing or removing toxins in food is an essential step for the amelioration of human health status and decreasing risk of onset or progression of degenerative diseases. | {
"pile_set_name": "PubMed Abstracts"
} |
Measuring Brain Stimulation Induced Changes in Cortical Properties Using TMS-EEG.
Neuromodulatory brain stimulation can induce plastic reorganization of cortical circuits that persist beyond the period of stimulation. Most of our current knowledge about the physiological properties has been derived from the motor cortex. The integration of transcranial magnetic stimulation (TMS) and electroencephalography (EEG) is a valuable method for directly probing excitability, connectivity and oscillatory dynamics of regions throughout the brain. Offering in depth measurement of cortical reactivity, TMS-EEG allows the evaluation of TMS-evoked components that may act as a marker for cortical excitation and inhibition. A growing body of research is using concurrent TMS and EEG (TMS-EEG) to explore the effects of different neuromodulatory techniques such as repetitive TMS and transcranial direct current stimulation on cortical function, particularly in non-motor regions. In this review, we outline studies examining TMS-evoked potentials and oscillations before and after, or during a single session of brain stimulation. Investigating these studies will aid in our understanding of mechanisms involved in the modulation of excitability and inhibition by neuroplasticity following different stimulation paradigms. | {
"pile_set_name": "PubMed Abstracts"
} |
The Infatuation With Biotin Supplementation: Is There Truth Behind Its Rising Popularity? A Comparative Analysis of Clinical Efficacy versus Social Popularity.
<p>Biotin, also known as Vitamin B7 or vitamin H, is a water-soluble B vitamin that acts as an essential cofactor for several carboxylases involved in the cellular metabolism of fatty acids, amino acids, and gluconeogenesis. Although there exists an incredible amount of social media hype and market advertising touting its efficacy for the improvement of hair quantity and quality, biotin's efficacy for hair remains largely unsubstantiated in scientific literature. We reviewed all pertinent scientific literature regarding the efficacy of biotin supplementation for hair growth and quality improvement, and we also investigated its popularity in society defined as a function of market analytics. To date, there have been no clinical trials conducted to investigate the efficacy of biotin supplementation for the treatment of alopecia of any kind, nor has there been any randomized controlled trial to study its effect on hair quality and quantity in human subjects. Because of the lack of clinical evidence, its use to improve hair quantity or quality is not routinely recommended. However, societal infatuation with biotin supplementation is not only propagated by its glamorization in popular media, its popularity is vastly disproportionate to the insufficient clinical evidence supporting it's efficacy in hair improvement. In other words, biotin supplements are quite "in vogue", without there being any real reason to be so.</p> <p><em>J Drugs Dermatol. 2017;16(5):496-500.</em></p>. | {
"pile_set_name": "PubMed Abstracts"
} |
[A case of central diabetes insipidus caused by metastatic small cell lung cancer].
A 58-year-old man was admitted to our hospital because of cough, polydipsia and polyuria. Chest CT films showed mediastinal lymphadenopathy, nodules in the lung fields, and pleural effusion. Histopathologic examination of transbronchial biopsy specimens showed oat cell carcinoma. MRI films revealed tumorous swelling of the pituitary stalk. Central diabetes insipidus caused by pituitary metastasis of small cell lung cancer was diagnosed. After treatment with whole-brain irradiation and chemotherapy, the size of the swollen pituitary stalk was reduced and his urine volume decreased. He died of respiratory insufficiency 15 months after the initial diagnosis. No recurrence of pituitary metastasis was apparent. This was a rare case of central diabetes insipidus caused by pituitary metastasis of small cell lung cancer successfully treated with radiotherapy and chemotherapy. | {
"pile_set_name": "PubMed Abstracts"
} |
Male pattern baldness and coronary heart disease: the Physicians' Health Study.
To examine the association between male pattern baldness and the risk of coronary heart disease (CHD) events. Retrospective cohort study among 22,071 US male physicians aged 40 to 84 years enrolled in the Physicians' Health Study. Of these, 19,112 were free of CHD at baseline and completed a questionnaire at the 11-year follow-up concerning their pattern of hair loss at age 45 years. Response options included no hair loss, frontal baldness only, or frontal baldness with mild, moderate, or severe vertex baldness. Coronary heart disease events defined as nonfatal myocardial infarction (MI), angina pectoris, and/or coronary revascularization. During 11 years of follow-up, we documented 1446 CHD events in this cohort. Compared with men with no hair loss, those with frontal baldness had an age-adjusted relative risk (RR) of CHD of 1.09 (95% confidence interval [CI], 0.94-1.25), while those with mild, moderate, or severe vertex baldness had RRs of 1.23 (95% CI, 1.05-1.43), 1.32 (95% CI, 1.10-1.59), and 1.36 (95% CI, 1.11-1.67), respectively (P for trend, <.001). Multivariate adjustment for age, parental history of MI, height, body mass index (weight in kilograms divided by the square of the height in meters as a continuous variable), smoking, history of hypertension, diabetes, high cholesterol level, physical activity, and alcohol intake did not materially alter these associations. Results were similar when nonfatal MI, angina, and coronary revascularization were examined separately, and when events were analyzed among men older and younger than 55 years at baseline. Vertex baldness was more strongly associated with CHD risk among men with hypertension (multivariate RR, 1.79; 95% CI, 1.31-2.44) or high cholesterol levels (multivariate RR, 2.78; 95% CI, 1.09-7.12). Vertex pattern baldness appears to be a marker for increased risk of CHD events, especially among men with hypertension or high cholesterol levels. | {
"pile_set_name": "PubMed Abstracts"
} |
INDIVIDUALISED CALCULATION OF TISSUE IMPARTED ENERGY IN BREAST TOMOSYNTHESIS.
The imparted energy to the glandular tissue in the breast (glandular imparted energy, GIE) is proposed for an improved assessment of the individual radiation-induced risk resulting from X-ray breast imaging. GIE is computed from an estimation of the quantity and localisation of glandular tissue in the breast. After a digital breast tomosynthesis (DBT) acquisition, the volumetric glandular content (volumetric breast density, VBD) is computed from the central X-ray projection. The glandular tissue distribution is determined by labelling the DBT voxels to ensure the conservation of the VBD. Finally, the GIE is calculated by Monte Carlo computation on the resulting tissue-labelled DBT volume. For verification, the method was applied to 10 breast-shaped digital phantoms made of different glandular spheres in an adipose background, and to a digital anthropomorphic phantom. Results were compared to direct GIE computations on the phantoms considered as 'ground-truth'. The major limitations in accuracy are those of DBT, in particular the limited z-resolution. However, for most phantoms, the results can be considered as acceptable. | {
"pile_set_name": "PubMed Abstracts"
} |
Ultrasound follow-up of posttraumatic injuries of the sagittal band of the dorsal hood treated by a conservative approach.
Traumatic dislocation of the extensor tendon over the metacarpophalangeal (MCP) joint is a rare problem in patients without rheumatoid disorders. The common extensor tendon is stabilized on the metacarpal head by components of the dorsal hood (DH). A tear in the sagittal bands, allows (sub)luxation of the tendon. To ensure appropriate treatment, the identification of the damaged structures is essential. Ultrasound (US) is a valuable method in the evaluation of DH injuries and in the follow-up for evaluation of healing or lack of healing of the lesions. We report three cases with partial rupture of the sagittal band of the DH: two cases in the index finger and one case in the long finger, which caused pain and swelling and was diagnosed with US. The patients were treated conservatively and the pain resolved after 9 months in case 1, 3 months in case 2 and 6 months in case 3. The follow-up at one year revealed painless full range of motion and no residual subluxation during the dynamic ultrasound. | {
"pile_set_name": "PubMed Abstracts"
} |
Neural markers of neuropathic pain associated with maladaptive plasticity in spinal cord injury.
Given the potential use of neural markers for the development of novel treatments in spinal cord pain, we aimed to characterize the most effective neural markers of neuropathic pain following spinal cord injury (SCI). A systematic PubMed review was conducted, compiling studies that were published prior to April, 2014 that examined neural markers associated with neuropathic pain after SCI using electrophysiological and neuroimaging techniques. We identified 6 studies: Four using electroencephalogram (EEG); 1 using magnetic resonance imaging (MRI) and FDG-PET (positron emission tomography); and 1 using MR spectroscopy. The EEG recordings suggested a reduction in alpha EEG peak frequency activity in the frontal regions of SCI patients with neuropathic pain. The MRI scans showed volume loss, primarily in the gray matter of the left dorsolateral prefrontal cortex, and by FDG-PET, hypometabolism in the medial prefrontal cortex was observed in SCI patients with neuropathic pain compared with healthy subjects. In the MR spectroscopy findings, the presence of pain was associated with changes in the prefrontal cortex and anterior cingulate cortex. When analyzed together, the results of these studies seem to point out to a common marker of pain in SCI characterized by decreased cortical activity in frontal areas and possibly increased subcortical activity. These results may contribute to planning further mechanistic studies as to better understand the mechanisms by which neuropathic pain is modulated in patients with SCI as well as clinical studies investigating best responders of treatment. | {
"pile_set_name": "PubMed Abstracts"
} |
False-positive colorimetric capnometry after ingestion of carbonated beverages.
To investigate the potential for false-positive colorimetric capnometric readings during esophageal intubation after ingestion of carbonated beverages. The study was conducted in the human patient simulation laboratory of a tertiary care pediatric hospital. The sole outcome measurement was the capnometric indicator membrane color after expiration for 10 breaths. Readings were recorded for scenarios simulating 8 different models. For all carbonated beverage trials with a cuffed endotracheal tube (ETT) and those with 2 and 6 oz of beverage in the gastric sac with an uncuffed ETT, a false-positive result was observed on the capnometer's indicator for breaths 1 through 10. The sensitivity of the capnometer for the detection of CO2 after full exhalation of breath 6 for these trials was 100%. For trials containing 12 oz in the gastric sac and an uncuffed ETT, yellow was observed on the capnometer indicator for breaths 1 through 3, tan for breaths 4 through 6, and purple for breath 7. The sensitivity of the capnometer for the detection of adequate CO2 after full exhalation of breath 6 for these trials was 0%. The overall sensitivity of the capnometer for the carbonated beverage models with a cuffed ETT was 100%, whereas the combined sensitivity for the trials with an uncuffed ETT was 67%. Under proper circumstances, a significant potential exists for false-positive colorimetric capnometric results in the presence of even small amounts of carbonated beverages. | {
"pile_set_name": "PubMed Abstracts"
} |
[The influence of enflurane (ethrane) on surface activity of the lung (author's transl)].
Enflurane (Ethrane), a new inhalation anesthetic, was examined for possible surfactant alterating properties. To elucidate this question two groups of rabbits underwent investigation: the first group (5 animals) was mechanically ventilated with room air over a five hour period. In the second group (7 animals) for the same period Enflurane in clinical dosages was added the inspired gas. At the end of the procedure in neither group could signs of impaired lung surface activity be detected: All rabbits showed normal blood gas values, normal pressure volume diagrams and physiologic behaviour of lung extracts in the wilhelmy balance. We conclude first that artificial ventilation "per se" does not harm lung surfactant and second that Enfluran anesthesia is a good choice for outstanding long procedures as well as for patients with already impaired surface activity of the lung, because there seems to be little risk of aggravating the situation. | {
"pile_set_name": "PubMed Abstracts"
} |
GBA1 mutations: Prospects for exosomal biomarkers in α-synuclein pathologies.
The discovery that patients with Gaucher Disease (GD), a rare lysosomal storage disorder, were developing symptoms similar to Parkinson's disease (PD) led to investigation of the relationship between the two seemingly unrelated pathologies. GD, an autosomal recessive disorder, is the result of a biallelic mutation in the gene GBA1, which encodes for the enzyme glucocerebrosidase (GCase). Since the observation of its relation to PD, GBA1 mutations have become recognized as the most common genetic risk factor for development of synucleinopathies such as PD and dementia with Lewy bodies. Although the exact mechanism by which GBA1 mutations promote PD is unknown, current understanding suggests that impaired GCase inhibits lysosomal activity and decreases the overall ability of the cell to degrade proteins, specifically the neuronal protein α-synuclein. Decreased elimination of α-synuclein can lead to its abnormal accumulation and aggregation, an important component of PD development. Further understanding of how decreased GCase activity increases risk for α-synuclein pathology can assist with the development of clinical biomarkers for early detection of synucleinopathies, as well as promote novel treatments tailored for people with a GBA1 mutation. Historically, α-synuclein has not been a reliable biomarker for PD. However, recent research on α-synuclein content within exosomes, which are small vesicles released by cells that carry specific cellular cargo, has yielded encouraging results. Moreover, decreased GCase activity has been shown to influence exosomal contents. Exosomes have emerged as a promising new avenue for the identification of novel biomarkers and therapeutic targets aimed at improving neuronal GCase function and limiting the development of synucleinopathies. | {
"pile_set_name": "PubMed Abstracts"
} |
Lung cancer associated with an azygos lobe successfully treated with video-assisted thoracoscopic surgery.
Primary lung cancer associated with an azygos lobe is extremely rare. Herein, we report the case of a 64-year-old woman with lung adenocarcinoma arising in the right upper lobe with an azygos lobe. The patient underwent a right upper lobectomy and lymph node dissection with video-assisted thoracoscopic surgery. Video-assisted thoracoscopic surgery lobectomy for lung cancer of this variant has yet to be reported. We demonstrate the intraoperative findings and the resected pulmonary lobe. This is the first case of primary lung cancer associated with the azygos lobe treated by lobectomy with video-assisted thoracoscopic surgery. | {
"pile_set_name": "PubMed Abstracts"
} |
32P distribution into 2,3-bisphosphoglyceric acid from human erythrocytes following molybdate-catalyzed hydrolysis.
Normal human washed erythrocytes were incubated in autologous plasma with 32P for varying periods of time. 2,3-Bisphosphoglyceric acid the major organic phosphate ester of red cells, was first isolated and purified by anion-exchange chromatography; subsequently, the C-2Pi was selectively hydrolyzed by a molybdate-catalyzed reaction. The C-2-bound Pi of 2,3-P2-glyceric acid was found to have a significantly higher specific activity than C-3 Pi. Intramolecular equilibration was not reached until the 180-min incubation. No evidence of overhydrolysis or internal randomization by the molybdate reaction was noted which was confirmed following hydrolysis of double-label 2,3-P2-glyceric acid 32P C-2, 33P C-3. | {
"pile_set_name": "PubMed Abstracts"
} |
Adenovirus-mediated P311 inhibits TGF-β1-induced epithelial-mesenchymal transition in NRK-52E cells via TGF-β1-Smad-ILK pathway.
P311, a highly conserved 8-kDa intracellular protein, has been indicated as an important factor in myofibroblast transformation and in the progression of fibrosis. In the present study, we constructed a recombinant adenovirus vector of p311 (called Ad-P311) and transferred it into rat renal proximal tubular epithelial cells (NRK-52E) to explore the effect of P311 on epithelial-mesenchymal transition (EMT) of NRK-52E cells induced by TGF-β1 and to elucidate its underlying mechanism against EMT. After successfully construction of Ad-P311 and transfer into NRK-52E cells, the proliferation and growth of P311-expressing cells was detected by MTT assay. TGF-β1 was used to induce NRK-52E cells and Western blot analysis was used to examine the EMT markers (E-cadherin and α-smooth muscle actin (α-SMA)), signal transducers (p-Smad2/3 and Smad7). Integrin Linked Kinase (ILK) as a key intracellular mediator that controls TGF-β1-induced-EMT was also assayed by Western blot analysis. The results showed that P311 transfection could significantly inhibit the proliferation and growth of TGF-β1 induced NRK-52E cells. The results also showed that TGF-β1 could induce EMT in NRK-52E cells through Smad-ILK signaling pathway with an increase in α-SMA, pSmad2/3 and ILK expression, and a decrease in E-cadherin and Smad7 expression. However, P311 efficiently blocked Smad-ILK pathway activation and attenuated all these EMT changes induced by TGF-β1. These findings suggest that P311 might be involved in the pathogenesis of renal fibrosis by inhibiting the EMT process via TGF-β1-Smad-ILK pathway. P311 might be a novel target for the control of renal fibrosis and the progression of CKD. | {
"pile_set_name": "PubMed Abstracts"
} |
Combined zidovudine and interferon-alpha 2a therapy in children with acquired immune deficiency syndrome.
A study was carried out in five children with acquired immune deficiency syndrome to assess the effect of combined zidovudine/interferon-alpha 2a therapy with that of zidovudine given alone on immunological profiles and plasma zidovudine concentrations. Immunoglobulins A, G and M, total and absolute CD4 lymphocyte counts, and p24 antigen concentrations did not differ significantly when children were treated with 300 mg/m2 zidovudine given orally once every 12 h, or with 150 mg/m2 zidovudine plus 1.5 or 3 MIU interferon-alpha 2a given intramuscularly three times weekly. Peak plasma zidovudine concentrations were significantly (P less than 0.05) lower when combined treatment with 150 mg/m2 zidovudine/1.5 MIU interferon-alpha 2a was administered compared with 300 mg/m2 zidovudine alone, or combined 150 mg/m2 zidovudine/3 MIU interferon-alpha 2a. The results suggest that combination zidovudine/interferon-alpha 2a therapy may be more efficacious than zidovudine alone and that the normal zidovudine dose may be reduced if interferon-alpha 2a is given in addition, thus reducing the side-effects associated with zidovudine. | {
"pile_set_name": "PubMed Abstracts"
} |
An algorithmic approach to modelling the retinal receptor topography.
Based on published research results on the structure of the human retina and the initial assumption of tight hexagonal packing of cones, the mean cone-distance function is derived. Disorder in the cone lattice is explained as the superposition of increasing topological distortion in the hexagonal lattice (providing a possible explanation for observed systematic lattice distortions) and local jitter of neighbor-to-neighbor distances, for which a simple statistical model is provided. These individual results are incorporated into a proposed algorithm for simulating the cone receptors' topography in 3D-space. Finally, possible software and hardware applications of the algorithmically defined retina model are briefly touched. | {
"pile_set_name": "PubMed Abstracts"
} |
Anaerobic microbial dechlorination: an approach to on-site treatment of toxaphene-contaminated soil.
Enhanced microbial degradation of toxaphene by natural microorganisms occurred in soil and sediment amended with organic matter kept under anaerobic (flooded) conditions. Laboratory experiments yielded a dissipation half-life of approximately 3 and 1 week for soil and sediment, respectively, containing 10 ppm of technical toxaphene and a 1% alfalfa meal amendment. Dissipation was accompanied by an increase in early eluting gas chromatographic peaks and a decrease in later eluting peaks, indicating that dechlorination had occurred. Enhanced anaerobic dissipation also took place in soil containing 500 ppm of toxaphene, although at a lesser rate than at 10 ppm, and when cotton gin waste was used as amendment in place of alfalfa meal. Sediment in a toxaphene-contaminated pesticide waste disposal ditch was amended with 10% steer manure and flooded to ascertain field utility of the technique for on-site decontamination. Toxaphene residues were reduced from 63 to 23 ppm in 120 days, and some degradation activity still occurred up to 8 months after this single treatment. | {
"pile_set_name": "PubMed Abstracts"
} |
Does pain interfere with antidepressant depression treatment response and remission in patients with depression and pain? An evidence-based structured review.
The objective of this evidence-based structured review was to determine if there is consistent evidence that pain interferes with achieving antidepressant treatment response/remission of depression in patients with depression and pain. After exclusion criteria were applied, of 2,801 studies/reports, 17 studies addressed this question. They were sorted into the four hypotheses outlined herein after. The percentage of studies supporting/not supporting each hypothesis was calculated. The strength and consistency of the evidence for each hypothesis were rated according to the Agency for Health Care Research and Quality (AHRQ) guidelines. For the first hypothesis (pretreatment pain levels will predict antidepressant depression response), nine out of 10 (90%) studies supported it. For the second hypothesis (treatment decreases in pain will be associated with antidepressant depression response), two out of two (100%) studies supported it. For the third hypothesis (pretreatment pain levels will predict antidepressant depression remission), six out of six (100%) studies supported it. For the fourth hypothesis (treatment decreases in pain will be associated with antidepressant depression remission), five out of five (100%) supported it. Utilizing these percentages and AHRQ guidelines, hypotheses 1, 3, and 4 received an A rating for consistency of studies in supporting them. A consistency rating for hypothesis 2 could not be generated because of too few studies in that group. Consistent evidence was found that antidepressant treatment of depression in patients with depression and pain can be negatively impacted by pain for achieving depression response/remission. However, the overall number of studies supporting each hypothesis was small. In addition, several potential confounders of the results of this study were identified. | {
"pile_set_name": "PubMed Abstracts"
} |
Liquid-Phase Electrochemical Scanning Electron Microscopy for In Situ Investigation of Lithium Dendrite Growth and Dissolution.
An in situ electrochemical scanning electronic microscopy method is developed to systematically study the lithium plating/stripping processes in liquid electrolytes. The results demonstrate that the lithium dendrite growth speed and mechanism is greatly affected by the additives in the ether-based electrolyte. | {
"pile_set_name": "PubMed Abstracts"
} |
[Hormonal and vitamin regulation of glucose-6-phosphatases activity in the liver].
Glucose-6-phosphatase (G-6-Phase) activity in the rat liver is established to correlate directly with the content of corticosteroids in blood: it lowers with hypocorticoidism (adrenalectomy) and rises with hypercorticoidism (stress). The highest G-6-Phase activity in the liver of the intact animals is observed in autumn, the lowest one in spring, i.e. in the periods when the adrenals function has minimal and maximal values, respectively. Thiamin (0.4 g/kg) is shown to cause a decrease in the G-6-Phase activity in the liver of the intact rats and adrenalectomized or hypophysectomized animals. An assumption is advanced that the found in the experiment a pronounced insulin-like effect of vitamin B with respect to the G-6-Phase activity is connected with an intensified synthesis of the corresponding hormone in the pancreas. | {
"pile_set_name": "PubMed Abstracts"
} |
That's easy for you to say: action identification and speech fluency.
Action identification theory holds that an action can be identified by the performer in different ways, and that these various act identities differ in their appropriateness for maintaining the action effectively. Optimal action identification exists when a personally easy action is identified in relatively high-level terms (i.e., the action's effects and implications) or a personally difficult action is identified in relatively low-level terms (i.e., the action's mechanical details). To test the optimality hypothesis with respect to speech fluency, subjects were asked to deliver a speech to either an easy-to-persuade audience or a difficult-to-persuade audience and induced to think about the action in either high-level or low-level terms. As predicted, subjects made fewer speech errors and felt more satisfied with their performance when the task was personally easy and identified at high level and when the task was personally difficult and identified at low level. Optimal action identification made things easier for them to say. | {
"pile_set_name": "PubMed Abstracts"
} |
Magnetoelectric coupling in single crystal Cu2OSeO3 studied by a novel electron spin resonance technique.
The magnetoelectric (ME) coupling on spin-wave resonances in single-crystal Cu2OSeO3 was studied by a novel technique using electron spin resonance combined with electric field modulation. An external electric field E induces a magnetic field component μ0H(i)=γE along the applied magnetic field H with γ=0.7(1) μT/(V/mm) at 10 K. The ME coupling strength γ is found to be temperature dependent and highly anisotropic. γ(T) nearly follows that of the spin susceptibility J(M)(T) and rapidly decreases above the Curie temperature T(c). The ratio γ/J(M) monotonically decreases with increasing temperature without an anomaly at T(c). | {
"pile_set_name": "PubMed Abstracts"
} |
Evaluation of a biosurfactant extract obtained from corn for dermal application.
At present, there is an increasing demand to improve the sustainability of surface-active compounds in dermal formulations. Biosurfactants, which are derived from living cells, are considered to be more environmentally friendly than synthetic surfactants. Thus, the use of biosurfactants is a promising strategy for the formulation of more environmentally friendly and sustainable dermal products. In this work, a biosurfactant extract (BS) obtained from corn wet-milling industry was studied for its potential use in dermal formulations. The corn derived BS possesses good surface-active properties and was found to be a suitable co-stabilizer for nanoemulsions and nanocrystals for dermal application. It also possesses antioxidative and skin protective properties and was also able to increase the dermal penetration efficacy for lipophilic actives. In dermal formulations the BS can therefore be used as co-stabilizer with antioxidative and penetration enhancing properties at the same time. | {
"pile_set_name": "PubMed Abstracts"
} |
Hepatitis E virus. Comparison of 'New and Old World' isolates.
The etiologic agent responsible for epidemics of enterically-transmitted non-A, non-B hepatitis has been molecularly characterized as the hepatitis E virus (HEV). The cloning of a portion of the Burma strain of HEV (HEV(B); 'Old World' strain) has been described together with the isolation of a contiguous overlapping set of cDNA clones representing the entire viral genome. Our studies have led to a model for the genomic organization of this positive strand, polyadenylated, RNA virus. Molecular clones encompassing the entire genome were also isolated from a cDNA library made from the Mexico strain of HEV (HEV(M); 'New World' strain). The translated nucleotide sequence of the Mexico isolate confirmed the genomic organization as first interpreted for HEV(B). This refers to the utilization of at least three different discontinuous open reading frames for protein expression and their apparent organization into 5' nonstructural and 3' structural gene regions. The comparison of the two strains identified a localized area of divergent nucleic and amino acid sequence that was previously reported in the region encoding the nonstructural gene(s) (ORF1). The HEV expression strategy involves at least two subgenomic poly-A transcripts that are co-terminal with the 3' end of the virus. Cross-reactive (type-common) epitopes are shared between the two divergent strains. It will be important to determine in future studies if any correlation exist between the viral pathobiology in animals or humans and the primary sequence of the virus. | {
"pile_set_name": "PubMed Abstracts"
} |
The use of aberrant medical humor by psychiatric unit staff.
The purpose of this study was to develop a grounded theory about the joking behaviors of psychiatric unit staff. Fifty nine staff members (Male = 23, Female = 36), ages 28-62, who worked in an urban, public facility were observed in unit meetings over a two year period. Data were analyzed using the constant comparative method. Participants used aberrant humor to deal with the basic social process of facing a series of ultimately unresolvable problems. The factors involved included the organizational context of the working environment, contact with a stigmatized patient group, and stressful staff-patient interactions which led to the erosion of a sense of professional competence and the resulting demoralization, resentment, and vengeful counteraction. Two major categories of joking emerged: whimsical and sarcastic humor. Six subcategories of humor also emerged: incongruous, bravado, self-mocking, discounting, malicious and gallows humor. Staff engaged in more sarcastic than whimsical humor. Findings support the need for professionals to recognize the potentially detrimental effects of joking behaviors on their treatment effectiveness. | {
"pile_set_name": "PubMed Abstracts"
} |
Spatial population mobility in Poland, 1952-1985.
This is a summary of the author's 1989 study on internal migration in Poland from 1952 to 1985. "The main aims of the study are: to describe spatial patterns of different types of migration vis-a-vis national socioeconomic change on the basis of the available unified statistical material...; to identify changes in the intensity and range (distance) of those movements; [and] to propose a hierarchical regionalization of permanent migration based on inter-voivodship flows, using the Slater method, as well as to identify the stage by the process of modernization of spatial mobility which has been reached in Poland." Data are primarily from official sources, including censuses and the current population register. | {
"pile_set_name": "PubMed Abstracts"
} |
Inhibition of Growth of Staphylococcus aureus during Production of Acidophilus Yogurt. 1.
Inhibition of growth of a pathogenic strain of Staphylococcus aureus and production of a metabolite, thermostable deoxyribonuclease (TDNase), in acidophilus yogurt and yogurt were investigated. The causative factors of inhibition (lactic acid, hydrogen peroxide and bacteriocin) were assessed. Accumulation of hydrogen peroxide after 2 h of fermentation was 0.88 p-g/ml, which caused a significant difference in the population of S. aureus between yogurts with and without catalase. Growth of S. aureus in the acidified yogurt was reduced after 4 h of fermentation when the pH of the medium was 4.8 or lower. Significant differences were found for the S. aureus populations of the acidified treatment and acidophilus yogurt with catalase suggesting that inhibition was due to bacteriocin(s) produced during the yogurt fermentation. The TDNase was significantly lower in the acidified yogurt and was totally inhibited in the three cultured yogurts during the fermentation period. | {
"pile_set_name": "PubMed Abstracts"
} |
Amentoflavone inhibits angiogenesis of endothelial cells and stimulates apoptosis in hypertrophic scar fibroblasts.
Amentoflavone (8-[5-(5,7-dihydroxy-4-oxo-chromen-2-yl)-2-hydroxy-phenyl]-5,7-dihydroxy-2-(4-hydroxyphenyl) chromen-4-one; AF) is a biflavonoid derived from the extracts of Selaginella tamariscina. It has been shown that AF has diverse biological effects such as antitumour, etc. It is well known that high cell proliferation, viability, angiogenesis and low apoptosis are key factors in hypertrophic scar formation. In this study, we report that AF inhibited viability and stimulated apoptosis in hypertrophic scar fibroblasts (HSFBs). Incubation of HSFBs with AF showed its inhibitory effect on cell viability and the exhibition of a series of cellular changes that were consistent with apoptosis. By Western-blot analysis, our data indicated significant increases in the amounts of cleaved caspases 3, 8, 9 and Bax, several apoptotic promoters and a significant decrease in translationally controlled tumour protein (TCTP), an apoptotic inhibitor, in HSFBs treated with AF. Furthermore, AF showed significant inhibitions on the viability, migration and tube formation of endothelial cells, which are associated with angiogenesis. In conclusion, this study suggests that AF stimulates apoptosis in HSFBs and inhibits angiogenesis of endothelial cells. Therefore, AF is a promising molecule that can be used in hypertrophic scar treatment. | {
"pile_set_name": "PubMed Abstracts"
} |
Gastric Cancer Risk in Patients with Helicobacter pylori Infection and Following Its Eradication.
As Helicobacter pylori is a first-class carcinogen, eradication of the infection would be expected to be a beneficial measure for the (primary) prevention of gastric cancer. Given the natural history of gastric cancer, it is plausible that eradication before gastric atrophy sets in offers the best chance for cancer risk reduction. The beneficial effects of eradication may, nevertheless, still be achievable in more advanced disease. The reversibility of inflammatory lesions has been supported by undeniable evidence; the regression of mucosal atrophy/metaplasia has also been confirmed by several recent histologic studies. | {
"pile_set_name": "PubMed Abstracts"
} |
In the Modern Treatment Era, Is Breast Conservation Equivalent to Mastectomy in Women Younger Than 40 Years of Age? A Multi-Institution Study.
Mastectomy is often recommended for women ≤40 years of age with breast cancer, as young women were under-represented in the landmark trials comparing breast conservation therapy (BCT) to mastectomy. We hypothesized that, in the modern treatment era, BCT and mastectomy result in equivalent local control rates in young women. Breast cancer cases arising between 1975 and 2013 in women ≤40 years old were collected from the tumor registries of 2 large healthcare systems in Utah. Kaplan-Meier estimates and Cox proportional hazards models were used to analyze freedom from locoregional recurrence (FFLR), overall survival (OS), and relapse-free survival (RFS). This analysis identified 853 BCT candidates. A comparison of BCT to mastectomy after 2000 showed FFLR, RFS, and OS were all similar. Rate for FFLR at 10 years was 94.9% versus 92.1% for BCT and mastectomy, respectively (P=.57). For women whose cancer was diagnosed after 2000, who received BCT, FFLR and RFS rates were improved compared to those whose cancer was diagnosed prior to 2000 (P<.05), whereas OS (P=.46) rates were similar. Among those who underwent mastectomy, FFLR, OS, and RFS were significantly improved (P<.05) with diagnosis after 2000. FFLR rates for young women, ≤40 years of age, have significantly improved for BCT and mastectomy over time. If patients were treated after 2000, BCT appears to be safe and equivalent to mastectomy at 10 years in terms of FFLR, OS, and RFS. | {
"pile_set_name": "PubMed Abstracts"
} |
Comparative performance of radiography and computed tomography in the diagnosis of middle ear disease in 31 dogs.
The purpose of this study was to compare computed tomography (CT) and radiography for diagnosing the presence and severity of middle ear disease in dogs with a history of chronic otitis externa. Thirty-one dogs undergoing a total ear canal ablation and bulla osteotomy were studied. Three normal dogs served as controls. All dogs were examined using radiography and CT. Three radiologists independently evaluated imaging studies in random order. A visual analog scale method was used for scoring certainty and severity of middle ear disease. Surgical findings were recorded intra-operatively. Bulla lining samples were submitted for histopathologic evaluation and scored by a single pathologist who also used a visual analog scale system. Findings from both imaging modalities agreed more closely with surgical findings than with histopathologic findings. With either surgical or histopathologic findings as the gold standard, CT was more sensitive than and as specific as radiographs for predicting presence and severity of middle ear disease. Observer performance with CT was more consistent than the performance with radiographs in the detection of changes that occur with middle ear disease. Both radiography and CT were more accurate for predicting the severity of the disease than its presence. Findings indicate that CT is more accurate and reliable than radiography in diagnosing middle ear disease for dogs having concurrent otitis externa, but only when severity of disease is moderate or high. With low severity of disease, diagnostic certainty for both modalities becomes more variable. | {
"pile_set_name": "PubMed Abstracts"
} |
18F-FDG PET hypometabolism patterns reflect clinical heterogeneity in sporadic forms of early-onset Alzheimer's disease.
Until now, hypometabolic patterns and their correlations with neuropsychological performance have not been assessed as a function of the various presentations of sporadic early-onset Alzheimer's disease (EOAD). Here, we processed and analyzed the patients' metabolic maps at the vertex and voxel levels by using a nonparametric, permutation method that also regressed out the effects of cortical thickness and gray matter volume, respectively. The hypometabolism patterns in several areas of the brain were significantly correlated with the clinical manifestations. These areas included the paralimbic regions for typical presentations of sporadic EOAD. For atypical presentations, the hypometabolic regions included Broca's and Wernicke's areas and the pulvinar in language forms, bilateral primary and higher processing visual regions (with right predominance) in visuospatial forms, and the bilateral prefrontal cortex in executive forms. Similar hypometabolism patterns were also observed in a correlation analysis of the 18F-FDG PET data versus domain-specific, neuropsychological test scores. These heterogeneities might reflect different underlying pathophysiological processes in particular clinical presentations of sporadic EOAD and should be taken into account in future longitudinal and therapeutic studies. | {
"pile_set_name": "PubMed Abstracts"
} |
The size of subconjunctival preparation does not influence the outcome of trabeculectomy with mitomycin C.
To compare the outcome of fornix-based trabeculectomy with mitomycin C (MMC) using 2 different sizes of subconjunctival preparation (36 mm² compared with 72 mm²). Prospective, randomized interventional case series. Patients 18 to 85 years of age with open-angle glaucoma and progressive visual field defects under maximum tolerated medical therapy were randomized to undergo initial fornix-based trabeculectomy with MMC (0.2 mg/mL for 5 min) with subconjunctival preparation of 6×6 mm (group A) or 8×9 mm (group B). Main outcome parameters were: intraocular pressure (IOP), best-corrected visual acuity (BCVA), number of 5-fluorouracil (5-FU) injections, and laser suturolyses (SL). Twenty-eight eyes of 26 patients were enrolled, including 14 eyes in group A and 14 in group B. At 12 months, IOP (mean±SD) was 9.69±2.5 mm Hg in group A and 9.93±3.2 mm Hg in group B (P=0.17) without glaucoma medication. Mean BCVA (logMAR) at month 12 was 0.29±0.26 in group A and 0.26±0.2 in group B (P=0.71). Patients required 3.0 5-FU in group A and 4.1±2.9 5-FU in group B (P=0.16); 1.3±1.1 SL and 1.8±1.1 SL, respectively (P=0.23). We noted 2 cases of intraocular hypotony in the 6×6 mm group (14.3%) and 1 in the 8×9 mm group (7.1%). There were no significant differences between study groups in mean IOP reduction, change in BCVA, or number of applied 5-FU and SL at 1-year follow-up. The area of subconjunctival preparation is only one of several factors playing a role in the outcome of trabeculectomy with MMC. | {
"pile_set_name": "PubMed Abstracts"
} |
The influence of sorghum grain decortication on bioethanol production and quality of the distillers' dried grains with solubles using cold and conventional warm starch processing.
Very high gravity hydrolysis-fermentation of whole and decorticated sorghum grains were compared using conventional and cold hydrolysis methods to assess the extent by which decortication could minimize enzymes dosages and affect the quality of the distillers' dried grains with solubles (DDGS). All processing configurations achieved ethanol concentrations between 126 and 132 g/L (16.0-16.7%v/v), although decortication resulted in a decreased ethanol yield. Decortication resulted in a decreased volumetric productivity during warm processing from 1.55 to 1.25 g L(-1)h(-1), whereas the required enzyme dosage for cold processing was decreased from 250 to 221 μl/100 gstarch. Cold processing decreased the average acid detergent fibre (ADF) from 35.59% to 29.32% and neutral detergent fibre (NDF) from 44.04% to 32.28% in the DDGS compared to the conventional (warm) processing. Due to lower enzyme requirements, the use of decorticated grains combined with cold processing presents a favourable process configuration and source of DDGS for non-ruminants. | {
"pile_set_name": "PubMed Abstracts"
} |
[A study of the immunological status in patients with stomach ulcer during acute conditions and remission].
The interest shown in the functioning of the immunity system at ulcer is mainly stipulated by newly emerged methods of diagnosing and treating patients, which have broadened our insight into the pathogenesis of the disease. The study of the nature of immunological improvements observed in the peripheral blood of patients with stomach ulcer enables us to find a differential approach to the correction of the inflammatory process. | {
"pile_set_name": "PubMed Abstracts"
} |
Effect of malnutrition on the digestive enzymes of the upper gastrointestinal tract of young rhesus monkeys.
The present study was planned to observe the effect of protein-energy malnutrition on the gastric and duodenal mucosa. The activities of digestive enzymes (i.e. lactase, sucrase, maltase, trehalase, glucoamylase, leucine aminopeptidase, alkaline phosphatase and gamma-glutamyl transpeptidase) from the gastric (fundus, body and antrum) and duodenal mucosa [i.e. first (D1) and second (D2) part of the duodenum] were determined in 6 control, 6 protein-energy malnourished (PEM) and 6 rehabilitated young rhesus monkeys. There was a significant increase in the activity of the lactase enzyme in the antrum, and D1 and D2 portions of the duodenum of PEM monkeys, while the activity of all other enzymes was significantly increased in the D1 and D2 portions only. The increase in the activity of the above-mentioned enzymes became normal upon rehabilitation. There was no change in the enzyme activities of the gastric mucosa in mild-to-moderate PEM states. This study demonstrates that even mild-to-moderate malnutrition states affect the activity of enzymes in the gastric and duodenal mucosa. Enzyme activity recovers on rehabilitation. | {
"pile_set_name": "PubMed Abstracts"
} |
Influence of nitric oxide donors and of the alpha(2)-agonist UK-14,304 on acetylcholine release in the pig gastric fundus.
This study in circular muscle strips of the pig gastric fundus aimed to measure the release of acetylcholine directly and to investigate whether NO and alpha(2)-adrenoceptor agonists can modulate acetylcholine release from cholinergic neurones. After incubation of the tissues with [(3)H]-choline, basal and electrically induced release of tritium and [(3)H]-acetylcholine were analyzed in a medium containing physostigmine (10(-5) M) as well as atropine (10(-6) M). The NO synthase inhibitor L-N(G)-nitroarginine methyl ester (3x10(-4) M), and the NO donors sodium nitroprusside (10(-5) M) and 3-morpholino-sydnonimine (10(-5) M) did not influence the basal release nor the electrically evoked release, indicating that NO does not modify [(3)H]-acetylcholine release. The alpha(2)-adrenoceptor agonist UK-14,304 (10(-5) M) significantly inhibited the electrically evoked release of [(3)H]-acetylcholine, and this effect was prevented by the alpha(2)-adrenoceptor antagonist rauwolscine (2x10(-6) M), suggesting that presynaptic alpha(2)-adrenoceptors are present on cholinergic neurones of the pig gastric fundus. | {
"pile_set_name": "PubMed Abstracts"
} |
Using In Vitro Ubiquitylation Assays to Estimate the Affinities of Ubiquitin-Conjugating Enzymes for Their Ubiquitin Ligase Partners.
Ubiquitin ligases (E3s) function by binding to both a protein substrate and to ubiquitin-conjugating enzymes (E2s) bound to ubiquitin. E3s facilitate the transfer of ubiquitin from the E2 active site to an E3-bound substrate. Thus, the affinity of the interaction of an E2 with its E3 partner is of considerable interest. The purpose of this work is to (1) provide protocols for the purification of the human E2 Cdc34, as well as for some additional protein components needed for the assays described here whose purification protocols haven't been described elsewhere in detail; (2) provide the researcher with critical information regarding the proper long-term storage of these enzymes to retain maximal activity; (3) provide a protocol to benchmark Cdc34 activity with previously described activity levels in the literature; and (4) provide a simple and rapid means of measuring E2 affinity for an E3. | {
"pile_set_name": "PubMed Abstracts"
} |
Synergistic actions of microglia and astrocytes in the progression of Alzheimer's disease.
Microglia and astrocytes are essential components of brain homeostasis. Interestingly, when the brain is exposed to adverse conditions, both astrocytes and microglia acquire specialized 'reactive' or 'activated' phenotypes that relate to the characteristics of the insult. In most cases they become important perpetrators of inflammation and potentially neuronal dysfunction. In neurodegenerative diseases such as Alzheimer's disease, the reciprocal interactions between microglia and astrocytes may be particularly important for the development of neuronal pathology and disease states. An important challenge is to understand how microglia and astrocytes inter-communicate at different stages of disease and the importance of this crosstalk on the physiology of surrounding neurons. In this review we focus on the potential roles that microglia and astrocytes fulfill in early to late stages of AD and how their synergistic actions may shape the progression of AD pathology to affect brain health. | {
"pile_set_name": "PubMed Abstracts"
} |
Red meat and cancer risk in a network of case-control studies focusing on cooking practices.
Consumption of red meat has been related to increased risk of several cancers. Cooking methods could modify the magnitude of this association, as production of chemicals depends on the temperature and duration of cooking. We analyzed data from a network of case-control studies conducted in Italy and Switzerland between 1991 and 2009. The studies included 1465 oral and pharyngeal, 198 nasopharyngeal, 851 laryngeal, 505 esophageal, 230 stomach, 1463 colon, 927 rectal, 326 pancreatic, 3034 breast, 454 endometrial, 1031 ovarian, 1294 prostate and 767 renal cancer cases. Controls included 11 656 patients admitted for acute, non-neoplastic conditions. Odds ratios (ORs) and confidence intervals (CIs) were estimated by multiple logistic regression models, adjusted for known confounding factors. Daily intake of red meat was significantly associated with the risk of cancer of the oral cavity and pharynx (OR for increase of 50 g/day = 1.38; 95% CI: 1.26-1.52), nasopharynx (OR = 1.29; 95% CI: 1.04-1.60), larynx (OR = 1.46; 95% CI: 1.30-1.64), esophagus (OR = 1.46; 95% CI: 1.23-1.72), colon (OR = 1.17; 95% CI: 1.08-1.26), rectum (OR = 1.22; 95% CI:1.11-1.33), pancreas (OR = 1.51; 95% CI: 1.25-1.82), breast (OR = 1.12; 95% CI: 1.04-1.19), endometrium (OR = 1.30; 95% CI: 1.10-1.55) and ovary (OR = 1.29; 95% CI: 1.16-1.43). Fried meat was associated with a higher risk of cancer of oral cavity and pharynx (OR = 2.80; 95% CI: 2.02-3.89) and esophagus (OR = 4.52; 95% CI: 2.50-8.18). Risk of prostate cancer increased for meat cooked by roasting/grilling (OR = 1.31; 95% CI: 1.12-1.54). No heterogeneity according to cooking methods emerged for other cancers. Nonetheless, significant associations with boiled/stewed meat also emerged for cancer of the nasopharynx (OR = 1.97; 95% CI: 1.30-3.00) and stomach (OR = 1.86; 95% CI: 1.20-2.87). Our analysis confirmed red meat consumption as a risk factor for several cancer sites, with a limited impact of cooking methods. These findings, thus, call for a limitation of its consumption in populations of Western countries. | {
"pile_set_name": "PubMed Abstracts"
} |
Plasma matrix metalloproteinase-9 levels, MMP-9 gene haplotypes, and cardiovascular risk in obese subjects.
Plasma matrix metalloproteinase (MMP)-9 is a predictor of cardiovascular mortality, and MMP-9 polymorphisms affect plasma MMP-9 levels. However, no study examined whether MMP-9 haplotypes affect MMP-9 levels in obese adults. We examined whether MMP-9 polymorphisms and haplotypes are associated with obesity, and whether they affect MMP-9 levels in obese subjects. We examined the plasma levels of MMP-9 and tissue inhibitor of metalloproteinase (TIMP)-1 in 105 subjects with normal weight (controls), 100 obese subjects, and 156 obese subjects with ≥3 metabolic risk factors (MRFs). We determined genotypes for three polymorphisms: C-1562T (rs3918242), Q279R (A>G, rs17576), and R668Q (G>A, rs17577). MMP-9 levels and activity (MMP-9/TIMP-1 ratio) were higher in obese subjects than in controls (P < 0.05). However, MMP-9 levels were higher in obese subjects with ≥3 MRFs than in obese subjects (P < 0.05). Obese subjects with ≥3 MRFs carrying the GA+AA genotypes for R668Q (G>A) polymorphism had higher MMP-9 levels than subjects carrying the AA genotype (P < 0.05). The "T, G, A" haplotype was more common in both groups of obese subjects than in controls (OR 3.95 and 4.39, respectively; P < 0.01). Notably, obese subjects with ≥3 MRFs carrying the "T, G, A" haplotype had higher MMP-9 levels than subjects carrying the "C, A, G" reference haplotype (P < 0.05). The "T, G, A" haplotype was associated with an increased risk of obesity and affected MMP-9 levels in obese subjects with ≥3 MRFs. Our findings suggest that plasma MMP-9 levels and MMP-9 haplotypes may help to discriminate obese subjects at an increased cardiovascular risk. | {
"pile_set_name": "PubMed Abstracts"
} |
Novel Pacing Strategies for Heart Failure Management.
Cardiac resynchronization therapy has emerged as the gold standard for heart failure patients with left ventricular systolic dysfunction and electrical dyssynchrony from an intrinsic intraventricular conduction delay or right ventricular pacing. However, the limits imposed by the coronary sinus venous anatomy restrict the applicability of the technology for many potential recipients. Furthermore, conventional resynchronization, by virtue of utilizing a single site of epicardial origin for left ventricular activation, is non-physiological. Several technologies on the horizon, including multisite pacing, left ventricular endocardial, and leadless devices, and direct His-bundle pacing are aimed at improving the response rate of cardiac resynchronization and extending candidacy to patients ineligible for conventional therapy. In this review, we discuss the limitations of the present technology and the role for these new therapies. | {
"pile_set_name": "PubMed Abstracts"
} |
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