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The syntrophically propionate-oxidizing bacterium Syntrophobacter wolinii was grown in binary methanogenic coculture with Methanospirillum hungatei as sole partner, free of contaminating Desulfovibrio vulgaris. Substrate tests revealed that S. wolinii could grow also without any syntrophic partner, either with pyruvate as sole substrate or with propionate plus sulfate. Pyruvate was fermented to acetate, propionate and presumably CO2; propionate in the presence of sulfate was oxidized incompletely to acetate and CO2, with stoichiometric sulfide formation. The pure culture contained cytochromes b and c menaquinone-7. Desulfovirdin or desulforubidin could not be detected.
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Wallrabenstein et al. (1994) studied this question.
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