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Dependence of the specific growth rate of methanogenic mutualistic cocultures on the methanogen

✍ Scribed by David B. Archer; Godfrey E. Powell

Publisher
Springer
Year
1985
Tongue
English
Weight
467 KB
Volume
141
Category
Article
ISSN
0302-8933

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✦ Synopsis

Methanogenesis from ethanol was studied in batch cocultures of a proton-reducing acetogenic DesuIfovibrio sp. together with one of eight methanogenic bacteria representing five genera. A mathematical model of mutualistic cocultures predicts an equalisation in the specific growth rates of the two species which defines a specific growth rate for the coculture. At non-limiting ethanol concentrations the model predicts that the specific growth rate of the coculture is dependent upon the Ks (Hz) of the methanogen and its maximum specific growth rate in axenic culture when utilising H2 as the energy source. We demonstrate experimentally that with methanogens known to have similar Ks (H2) values, the specific growth rates of methanogenic mutualistic cocultures are dependent upon the maximum specific growth rates of the methanogens.

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