, Volume 144, Issue 2, pp 163-165

Interspecific hydrogen transfer during methanol degradation by Sporomusa acidovorans and hydrogenophilic anaerobes

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Abstract

In the presence of active hydrogenophilic sulfate-reducing bacteria, the homoacetogenic bacterium Sporomusa acidovorans did not produce acetate during methanol degradation. H2S and presumably CO2 were the only end products. Since the sulfate-reducer did not degrade methnol or acetate, the sulfidogenesis from methanol was related to a complete interspecific hydrogen transfer between both species.

In coculture with hydrogenophilic methanogenic bacteria (Methanobacterium formicicum, Methanospirillum hungatei), the interspecific hydrogen transfer with S. acidovorans was incomplete. Beside CH4 and presumably CO2, acetate was produced. The results suggested that H2-production and H2-consumption were involved during anaerobic methanol degradation by S. acidovorans and the hydrogenophilic anaerobes play an important role during methanol degradation by homoacetogenic bacteria in anoxic environments.