Which bacteria need no oxygen ? – Science

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Microbes or bacteria that grow in an anaerobic environment don’t need oxygen. They cannot generate energy through aerobic respiration and must employ fermentation or anaerobic respiration for this purpose. They can be:

FACULTATIVE ANAEROBES: do not require oxygen for growth, but grow better in its presence.

AEROTOLERANT ANAEROBES: such as Enterococcus faecallis, simply ignore oxygen and grow equally well whether it is present or not.

STRICT/OBLIGATE ANAEROBES: do not tolerate oxygen at all and die in its presence, e.g., Bacteroides, Fusobacterium, Clostridium pasteurianum, Methanococcus, Neocallimastix, etc.

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