Acetogen

The term acetogen refers to a bacterium that generates acetateas a product of anaerobic respiration. This process is different from acetate fermentation, although both occur in the absence of oxygen and produce acetate. These organisms are also referred to as acetogenic bacteria, because all known acetogens are bacteria.

Acetogens are found in a variety of habitats, generally those that are anaerobic(lack oxygen). Acetogens can use a variety of compounds as sources of energy and carbon; the best studied form of acetogenic metabolism involves the use of carbon dioxideas a carbon source and hydrogenas an energy source.

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It uses material from the http://en.wikipedia.org/wiki/Acetogen Wikipedia article Acetogen.