From Big Medical Encyclopedia

MICROORGANISMS (synonym microbes) — the various microscopic living beings differing in the individual cellular organization (protozoa, fungi, photobacteria, skotobakteriya) or (viruses) which do not have a cellular texture.

Viruses quite often are considered not as organisms, and as autonomous genetic structures.

Among M. distinguish the following: protozoa (see) and fungi (see. Fungi parasitic ), being eukaryotes (have the issued kernel with a cover and the expressed cellular organellas); a photobacterium — the phototrophic prokariota (a kernel without cover, is not present high-organized organellas) using energy due to photosynthesis (e.g., blue-green seaweed); skotobakteriya — prokariota, neutral to light, and viruses (see).

Many types of M., except for photobacteria, pathogens for the person and animals. Morfol, M.'s features are presented in the table. Across Berdzhi (D. Bergey, 1974), at skotobakteriya three classes distinguish: Bacteria, Rickettsia and Mollicutes. Respectively to a class bacteria (see) it is necessary to carry, except bacteria (kokkovidny, rod and gyrose forms), also spirochetes (see) and actinomycetes (see), the having properties of bacteria (on the cell structure, chemical structure of a cell wall etc.). In a class rickettsiae (see) — obligate intracellular skotobakteriya — two orders of Rickettsiales and Chlamydiales enter. Mycoplasmas (see. Mycoplasmataceae ) enter a class Mollicutes (see).

See also Yeast .

Table. Some morphological features of pathogenic microorganisms

A.S. Bykov.