Oxygen Requirements of Microorganisms
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Obligate aerobe: O2 essential for aerobic respiration.
Micrococcus
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Facultative aerobe: Grows better with O2, but
can undertake both aerobic and anaerobic respiration, and fermentation.
Rhizobium
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Microaerophilic: O2 is essential for respiration
but at levels below those in the air. Azospirillum
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Aerotolerant anaerobe: O2 not required and doesn’t
improve growth. Fermentative. Streptococcus
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Obligate anaerobe: O2 harmful, grows via anaerobic
respiration or fermentation. Clostridium
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