The term acetogen refers to a bacterium that generates acetate as a product of anaerobic respiration. This process's 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're anaerobic (lack oxygen). Acetogens can use a variety of compounds as sources of energy and carbon; the best… (More on Acetogen)