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Desulfuromonas thiophila sp. nov., a New Obligately Sulfur-Reducing Bacterium from Anoxic Freshwater Sediment

¹Institute of Biological Sciences, Department of Microbial Ecology; University of Århus, Ny Munkegade, DK-8000 Århus C, Denmark
²Water Resources Division, U.S. Geological Survey, Reston, Virginia 22092
³Max-Planck-Institut für terrestrische Mikrobiologie, D-35043 Marburg, Germany
⁴Primelweg 12, D-88662 überlingen, Germany

^* Corresponding author: Phone: 45-89-42-3241. Fax: 45-86-12-7191, E-mail: Kai{at}bio.aau.dk.

ABSTRACT

A mesophilic, acetate-oxidizing, sulfur-reducing bacterium, strain NZ27^T, was isolated from anoxic mud from a freshwater sulfur spring. The cells were ovoid, motile, and gram negative. In addition to acetate, the strain oxidized pyruvate, succinate, and fumarate. Sulfur flower could be replaced by polysulfide as an electron acceptor. Ferric nitrilotriacetic acid was reduced in the presence of pyruvate; however, this reduction did not sustain growth. These phenotypic characteristics suggested that strain NZ27^T is affiliated with the genus Desulfuromonas. A phylogenetic analysis based on the results of comparative 16S ribosomal DNA sequencing confirmed that strain NZ27^T belongs to the Desulfuromonas cluster in the recently proposed family "Geobacter-aceae" in the delta subgroup of the Proteobacteria. In addition, the results of DNA-DNA hybridization studies confirmed that strain NZ27^T represents a novel species. Desulfuromonas thiophila, a name tentatively used in previous publications, is the name proposed for strain NZ27^T in this paper.

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