Title: Archaea - an overview | ScienceDirect Topics
Headings: Archaea
Archaea
Archaea
Abstract
ARCHAEA
Psychrophiles
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Polymerase chain reaction (PCR)
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Content: The biodiversity of Deep Lake is low, and is dominated by Archaea of the family Halobacteriaceae. To date, only three psychrophilic archaeal strains, all free-living and members of the subdomain Eukaryarchaeota, are available in pure culture. Methanococcoides burtonii ( Tmin −2.5°C) and Methanogenium frigidum ( Tmin −10°C) were originally isolated from the bottom of Ace Lake, Antarctica, where the methane-saturated waters remain between 1 and 2°C. View chapter Purchase book
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URL: https://www.sciencedirect.com/science/article/pii/B0123485304005257
Archaea (overview)
S. DasSarma, ... P. DasSarma, in Encyclopedia of Microbiology (Third Edition), 2009
Introduction
Archaea are prokaryotic microorganisms that are members of the third branch (or domain) of life, distinct from the other two domains – Bacteria and Eucarya. Archaea were recognized as a coherent group in the tree of life using small ribosomal RNA (rRNA) sequence comparisons by C. R. Woese and coworkers in 1977. Archaea have been detected in nearly all environments examined using culture-independent molecular techniques, including 16S rRNA sequencing. However, most well-characterized Archaea have been cultured from extreme environments that are very salty, acidic, alkaline, hot, cold, or anaerobic where they are sometimes dominant. Methanogenic Archaea have been detected in the mammalian gastrointestinal tract, but no archaeal species causing disease has been identified thus far. Many Archaea are chemoautotrophs and can grow on simple inorganic chemicals, others are heterotrophs and grow on complex organic materials, and a few have phototrophic capabilities and can use light energy for growth.