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What is The stain used to detect amyloid is? and explain in detail?
Ans. (b) Congo redRef: Robbin's pathology 9th ed. 1257* In biochemistry and histology, Congo red is used to stain microscopic preparations especially as a cytoplasm and erythrocyte stain.* Apple-green birefringence of Congo red stained preparations under polarized light is indicative for the presence of amyloid fibrils.* Additionally, Congo Red is used in microbiological epidemiology to rapidly identify the presence of virulent serotype 2A ShigellaFlexneri, where the dye binds the bacterium's unique lipopolysaccharide (LPS) structure