Lookup NU author(s): Dr Jan Dolfing
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Microbial degradation of organic material in methanogenic ecosystems is a multistep process in which subsequent groups use the products of the first groups of organisms in the chain as substrates. The acetogenic bacteria in these systems produce both H-2 and acetate. In the present minireview a thermodynamic approach is taken to evaluate the logic behind this duality. The evaluation shows that at the H-2 partial pressures that usually occur in methanogenic ecosystems the acetogenic oxidation of known acetogenic substrates such as propionate, butyrate, and benzoate yields mon energy than their complete oxidation to H-2/CO2. Also, H-2 partial pressures needed to achieve complete hydrogenogenic oxidation of these acetogenic substrates would have to be so low that H, would be virtually unavailable to the hydrogenotrophic bacteria, in casu the methanogens.
Author(s): Dolfing J
Publication type: Article
Publication status: Published
Journal: Microbial Ecology
Print publication date: 01/02/2001
ISSN (print): 0095-3628
ISSN (electronic): 1432-184X
Notes: Times Cited: 2
Cited Reference Count: 34
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