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DesulfomicrobiumRANK: GenusTAXONOMY: Bacteria -> Proteobacteria -> delta/epsilon subdivisions -> Deltaproteobacteria -> Desulfovibrionales -> Desulfomicrobiaceae -> Desulfomicrobium OVERVIEW: Short, straight rod- or ellipsoidal-shaped cells, 0.5–0.9 × 1.3–2.9 μm, with rounded ends, either singly or in pairs (Sharak Genthner et al., 1994). Gram-negative stain reaction and cell-wall structure. Cells are motile, usually by a single polar flagellum. Endospores not formed. Anaerobic. Pre-reduced medium or reducing agent required in medium for growth. Growth can occur by anaerobic respiration with sulfate or sulfoxyanions as terminal electron acceptor, producing H2S. Simple organic compounds that serve as electron donors during sulfate respiration include lactate, pyruvate, ethanol, formate, and hydrogen. Sulfate respiration with lactate as electron donor is incomplete, with the formation of acetate and CO2. Hydrogenase present. Cells contain b- and c-type cytochromes. Metabolism can also be fermentative on simple organic substrates, including pyruvate, malate, or fumarate. Carbohydrates are not fermented. No specific vitamins required. Nitrate not reduced. No requirement for NaCl. Desulfoviridin absent. Optimal temperature 25–30°C. Found in freshwater to brackish to marine anaerobic sediments and mud, in anaerobic stratal or overlying water, and in saturated mineral or organic deposits.The mol% G + C of the DNA is: 52.5–59.6.Type species: Desulfomicrobium baculatum |