Strain MLF(T = type strain), a new thermophilic, spore-forming sulfate-reducing bacterium, was characterized and was found to be phenotypically, genotypically, and phylogenetically related to the genus . This organism was isolated from a butyrate enrichment culture that had been inoculated with a mixed compost containing rice hulls and peanut shells. The optimum temperature for growth was 50°C. The G+C content of the DNA was 51.2 mol%. Strain MLFincompletely oxidized pyruvate, butyrate, and butanol to acetate and presumably CO. It used long-chain fatty acids and propanediols. We observed phenotypic and phylogenetic differences between strain MLFand other thermophilic species that also oxidize long-chain fatty acids. On the basis of our results, we propose that strain MLFis a member of a new species, .


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