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ThermomicrobiumRANK: GenusTAXONOMY: Bacteria -> Terrabacteria group -> Chloroflexi -> Thermomicrobia -> Thermomicrobiales -> Thermomicrobiaceae -> Thermomicrobium OVERVIEW: Short, irregularly shaped rods, 1.3–1.8 µm in diameter and 3.0–6.0 µm in length. The pleomorphic forms are dumbbell shaped or appear irregular in diameter and occur singly or in pairs. Neither resting stages nor endospores are formed. Gram negative. No peptidoglycan diamino acid occurs in the cell walls in significant amounts. Nonmotile. Obligately aerobic. Optimum temperature for growth, 70–75°C; maximum, 80°C, minimum, 45°C. Optimal pH, 8.2–8.5, but good growth occurs between 7.5 and 8.7. Chemoorganotrophic, having a strictly respiratory type of metabolism with oxygen as the terminal electron acceptor. Catalase positive. Colonies have a rose-pink color. Maximum growth occurs on a medium consisting of yeast extract and peptone (0.5% each). Growth does not occur on glucose. n-Alkanes are not utilized. Generation time, 5.5 h. Isolated from a hot spring in Yellowstone National Park, U.S.A.The mol % G + C of the DNA is: 64. Type species: Thermomicrobium roseum |