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As pointed out above, viruses must inhabit a host cell in order to grow and
multiply. Summary Their growth cycle begins with their attachment (adsorp- of
growth tion) to a susceptible cell. The nucleic acid component cycle and, in some
Other bacteria, such as the rod-shaped E. coli, can be converted to spheroplasts (
globular-shaped bodies) by treatment with the enzyme lysozyme, which digests
away part of the cell wall. The spheroplasts will then take up and be infected by ...
Viral mutants with reduced virulence are known as attenuated strains; such
mutants have less severe effects on the host cells than does the parental strain.
Attenuated strains, however, which are often used in vaccines, frequently have
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review