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Thermoproteus uzoniensis sp. nov., a new extremely thermophilic archaebacterium from Kamchatka continental hot springs

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A new extremely thermophilic rod-shaped archaebacterium was found in the samples from hot springs and soil of the Uzon caldera (SW of Kamchatka pen.). Cells are rods from 1 to 20 μm in length and 0.3 to 0.4 μm in width, sometimes branching or with spherical protrusions on the ends. The cell wall consists of two layers: an internal one with distinct hexagonal structure and the outer one with less clear structure and variable thickness. Cells are non-motile and have no flagella. The new organism grows anaerobically by fermenting peptides, concurrently reducing elemental sulfur to H2S. Fermentation products are acetate, isobutyrate, isovalerate. The G+C content of the DNA is 56.5 mol. %. A new species Thermoproteus uzoniensis is described. Type strain is isolate Z-605, DSM 5262.

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Bonch-Osmolovskaya, E.A., Miroshnichenko, M.L., Kostrikina, N.A. et al. Thermoproteus uzoniensis sp. nov., a new extremely thermophilic archaebacterium from Kamchatka continental hot springs. Arch. Microbiol. 154, 556–559 (1990).

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