Definition of acetogen
: any of various anaerobic bacteria that produce acetic acid in the form of acetate from the metabolism of certain sugars (such as xylose or glucose) or from carbon dioxide and hydrogen Kangaroos produce barely any methane as their dominant gut flora are acetogens, not methanogens. — Bijal Trivedi, New Scientist, 20 Dec. 2008 Interest in acetic acid synthesis by acetogens has focused on synthesis from biomass-derived sugars … — J. G. Zeikus et al., Science, 8 Mar. 1985
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