title: [Microbiological analysis of cryopegs from the Varandei Peninsula, Barents Sea].
abstract: The paper deals with the microbiological characterization of water-saturated horizons in permafrost soils (cryopegs) found on the Varandei Peninsula (Barents Sea coast), 4-20 m deep. The total quantity of bacteria in the water of cryopegs was 3.5 x 10(8) cells/ml. The population of cultivated aerobic heterotrophic bacteria was 3-4 x 10(7) cells/ml and the number of anaerobic heterotrophic bacteria varied from 10(2) to 10(5) cells/ml depending on cultivation temperature and salinity. Sulfate-reducing bacteria and methanogenic archaea were found as hundreds and tens of cells per ml of water, respectively. A pure culture of a sulfate-reducing strain B15 was isolated from borehole 21 and characterized. Phylogenetic analysis has shown that the new bacterium is a member of the genus Desulfovibrio with Desulfovibrio mexicanus as its closest relative (96.5% similarity). However, the significant phenotypic differences suggest that strain B15 is a new species of sulfate-reducing bacteria.
authors: S A
authors: SA
authors: Pecheritsyna
authors: V A
authors: VA
authors: Shcherbakova
authors: A L
authors: AL
authors: Kholodov
authors: V N
authors: VN
authors: Akimov
authors: T N
authors: TN
authors: Abashina
authors: N E
authors: NE
authors: Suzina
authors: E M
authors: EM
authors: Rivkina
mesh_terms: D001105:Archaea / Q000302:isolation & purification / Q000378:metabolism; D001110:Arctic Regions; D001419:Bacteria / Q000145:classification / Q000302:isolation & purification*; D003080:Cold Temperature; D003901:Desulfovibrio / Q000145:classification / Q000302:isolation & purification; D007053:Ice; D008386:Marine Biology; D008697:Methane / Q000378:metabolism; D012426:Russia; D054712:Salinity; D012623:Seawater / Q000382:microbiology*; D016999:Sulfur-Reducing Bacteria / Q000145:classification / Q000302:isolation & purification; D014871:Water Microbiology
chemical_list: D007053:Ice; D008697:Methane