Dependence of the specific growth rate of methanogenic mutualistic cocultures on the methanogen |
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Authors: | David B Archer Godfrey E Powell |
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Institution: | (1) AFRC Food Research Institute, Colney Lane, NR4 7UA Norwich, UK |
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Abstract: | Methanogenesis from ethanol was studied in batch cocultures of a proton-reducing acetogenic Desulfovibrio 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 K
s (H2) 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 K
s (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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Keywords: | Methanogen Desulfovibrio Coculture Mutualism Model |
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