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Volume 65, Issue Pt_4

Characterization of sp. nov., isolated from a thermal spring Free

Abstract

A novel anaerobic, mesophilic, slightly halophilic sulfate-reducing bacterium, designated strain Khaled BD4, was isolated from waters of a Tunisian thermal spring. Cells were vibrio-shaped or sigmoids (5–7×1–1.5 µm) and occurred singly or in pairs. Strain Khaled BD4 was Gram-stain-negative, motile and non-sporulated. It grew at 25–45 °C (optimum 37 °C), at pH 5.5–8.3 (optimum pH 7.0) and with 0.5–8 % NaCl (optimum 3 %). It required vitamins or yeast extract for growth. Sulfate, thiosulfate, sulfite and elemental sulfur served as terminal electron acceptors, but not fumarate, nitrate or nitrite. Strain Khaled BD4 utilized H in the presence of 2 mM acetate (carbon source), but also lactate, formate, pyruvate and fumarate in the presence of sulfate. Lactate was incompletely oxidized to acetate. Amongst substrates used, only pyruvate was fermented. Desulfoviridin and -type cytochrome were present. The G+C content of the DNA was 54.6 mol%. The main fatty acids were anteisoC, iso-C, iso-C and iso-C. Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain Khaled BD4 had DSM 4123 (96.7 % similarity) as its closest phylogenetic relative. On the basis of 16S rRNA gene sequence comparisons together with genetic and physiological characteristics, strain Khaled BD4 is assigned to a novel bacterial species, for which the name sp. nov. is proposed. The type strain is Khaled BD4 ( = DSM 28904 = JCM 30146).

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2015-04-01
2024-04-16
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Characterization of Desulfovibrio biadhensis sp. nov., isolated from a thermal spring
Int J Syst Evol Microbiol 65, 1256 (2015); https://doi.org/10.1099/ijs.0.000088
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