Capsulated Microorganisms

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Capsulated Microorganisms

 

bacteria, yeasts, and mold fungi whose cells are surrounded by a gelatinous capsule consisting chiefly of polysaccharides and protecting the cell against unfavorable external influences. Azotobacter, Leuconos-toc, pneumococcus, and some kinds of asporogenous yeasts (such as Torulopsis) have thick capsules. The existence of capsules is determined by staining specimens or placing them in an india ink preparation; a light zone corresponding to the capsule can then be seen around capsulated microorganisms. Pathogenic capsulated microorganisms become avirulent when they lose their capacity to form capsules.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.