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The last eight chapters (18–25) have focused on the somewhat
narrow field of pathogenic microbiology, necessarily overlooking
many other interesting and useful aspects of microbiology
and microorganisms. This last chapter emphasizes microbial activities
that help maintain, sustain, and control the life support systems on the
earth. This subject is explored from the standpoints of (1) the natural
roles of microorganisms in the environment and their contributions to
the ecological balance, including soil, water, and mineral cycles, and
(2) the artificial applications of microbes in the food, medical, biochemical,
drug, and agricultural industries.
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