Strain Groll, isolated from fresh water, is a mesophilic, spore-forming, sulfatereducing bacterium that uses a large variety of substrates as electron donors ranging from simple organic compounds to long-chain fatty acids and several aromatic compounds. Sulfate, thiosulfate and sulfite are used as electron acceptors. Homoacetogenic growth occurs under sulfate-free conditions. Substrate oxidation is usually complete, leading to CO, but acetate or other fatty acids can accumulate at high substrate concentrations. The G+C content of the DNA is 54·8 mol%. Strain Groll was found to be phenotypically and phylogenetically different from known members of the genus . 16S rRNA gene sequence analyses show that this organism falls within the radiation of the genus cluster and has <96% sequence similarity to previously described species. The name sp. nov. is proposed for this strain; the type strain is Groll (= DSM 7213).


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