T hermodesulforhabdus

Abstract

Abstract Ther.mo.de.sul.fo.rhab'dus. Gr. adj. thermos warm, hot; L. pref. de from; L. masc. n. sulfur sulfur; Gr. fem. n. rhabdos rod; N.L. fem. n. Thermodesulforhabdus thermophilic, rod‐shaped, sulfate reducer. Desulfobacterota / Syntrophobacteria / Syntrophobacterales / Thermodesulforhabdaceae / Thermodesulforhabdus Rod‐shaped cells, 1 × 2.5 µm. Occur singly or in pairs. Spore formation is not observed. Gram‐stain‐negative. Motile. Strictly anaerobic, having a respiratory type of metabolism. Chemoorganoheterotrophic, using straight‐chain fatty acids, other organic acids, and ethanol as carbon sources and electron donors. Electron donors are completely oxidized to CO 2 via the anaerobic C 1 pathway (carbon monoxide dehydrogenase or Wood–Ljungdahl pathway). Sulfate and sulfite serve as terminal electron acceptors and are reduced to H 2 S. Thiosulfate, sulfur, fumarate, and nitrate are not used as terminal electron acceptors. Thermophilic. The optimal temperature for growth is 60°C. Neutrophilic. The optimal pH for growth is 6.9. NaCl and MgCl 2 are necessary for growth. Media containing a reductant are necessary for cultivation. Vitamins are not required. The major menaquinone, the pattern of polar lipids, and the cellular fatty acid profiles are not known. The genus currently accommodates a single species Thermodesulforhabdus norvegica . The type strain of the genus was isolated from hot North Sea oil field water from a Norwegian oil platform. Thermodesulforhabdus species occur in hot North Sea oil field water and hydrothermal vents. DNA G + C content (mol%) : 51 (LC), 49.7 (genome). Type species : Thermodesulforhabdus norvegica Beeder, Torsvik and Lien 1996, 625 VP (Effective publication: Thermodesulforhabdus norvegicus Beeder, Torsvik and Lien 1995, 335).