题目内容
Viruses are submicroscopic agents which infect plants, animals and bacteria.
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The principal micro organisms involved are all chemoorganotrophs and derive their carbon and energy supply from the metabolism of organic compounds.
Of the Gram-positive organisms, aerobic, endospore-forming bacteria of the genus bacillus, some coryneform bacteria (Corynebacter-ium and Brevibacterium) and the filamentous bacteria (actinomycetes) particularly of the genus Streptomyces are well represented.
Gram-negative types include acetic acid bacteria and Xanthomonads(黄单胞杆菌).
The relevant characteristics of these microorganisms are that they should be non-pathogenic, easy to maintain and cheap to grow.
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