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Anaerobe. 1995 Feb;1(1):35-9.

Evidence for H2 and formate formation during syntrophic butyrate and propionate degradation.

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Department of Microbiology, Wageningen Agricultural University, The Netherlands.


Both H2 and formate were formed during butyrate oxidation by Syntrophospora bryantii with pentenoate as electron acceptor and during propionate oxidation by a mesophilic propionate oxidizing bacterium (MPOB) with fumarate as electron acceptor. H2 and formate levels were affected by the bicarbonate concentration. S bryantii and MPOB were also able to interconvert formate and H2+ HCO3-; the apparent K(M) values for formate were of 2.9 mM and 1.8 mM, respectively. The conversion of H2+ HCO3- to formate was detected only when the H2 partial pressure was above 80 kPa. This interconversion seems to be rather unimportant under conditions prevailing during syntrophic propionate and butyrate oxidation.


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