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Abstract
A novel anaerobic, chemo-organotrophic bacterium, designated VNs36T, was isolated from a well that collected water from a deep saline aquifer used for underground gas storage at a depth of 830 m in the Paris Basin, France. Cells were curved motile rods or vibrios (3.0–5.0×0.5 μm). Strain VNs36T grew at temperatures between 20 and 50 °C (optimum 37 °C) and at pH values between 5.0 and 9.0 (optimum 6.9). It did not require salt for growth, but tolerated up to 20 g NaCl l−1 (optimum 2 g l−1). In the presence of sulfate, strain VNs36T used lactate, formate and pyruvate as carbon and energy sources. The main fermentation products from lactate were acetate, H2 and CO2. Sulfate, thiosulfate and sulfite were used as electron acceptors, but not sulfur. The genomic DNA G+C content of strain VNs36T was 67.2 mol%. Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain VNs36T was affiliated with the family Desulfovibrionaceae within the class Deltaproteobacteria. On the basis of 16S rRNA gene sequence comparisons, DNA G+C content and the absence of desulfoviridin in cell extracts, it is proposed that strain VNs36T be assigned to a new genus, Desulfocurvus gen. nov., as a representative of a novel species, Desulfocurvus vexinensis sp. nov. The type species of this genus is Desulfocurvus vexinensis with the type strain VNs36T (=DSM 17965T=JCM 14038T).
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