| methylosphaera hansonii gen. nov., sp. nov., a psychrophilic, group i methanotroph from antarctic marine-salinity, meromictic lakes. | methanotrophic bacteria were enumerated and isolated from the chemocline and surface sediments of marine-salinity antarctic meromictic lakes located in the vestfold hills, antarctica (68 degrees s 78 degrees e). most probable number (mpn) analysis indicated that at the chemocline of ace lake the methanotroph population made up only a small proportion of the total microbial population and was sharply stratified, with higher populations detected in the surface sediments collected at the edge of ac ... | 1997 | 9141708 |
| sterols in a psychrophilic methanotroph, methylosphaera hansonii. | a suite of six sterols, lanosterol, lanost-8(9)-en-3beta-ol, 4, 4-dimethylcholesta-8(14),24-dien-3beta-ol, 4, 4-dimethylcholest-8(14)-en-3beta-ol, 4-methylcholesta-8(14), 24-dien-3beta-ol and 4-methylcholest-8(14)-en-3beta-ol, were identified in the psychrophilic methanotrophic bacterium, methylosphaera hansonii. their presence suggests that the capacity for sterol biosynthesis in methanotrophic bacteria is limited to the family methylococcaceae but which have widely different optimal growth tem ... | 2000 | 10802170 |
| [methanotrophic communities in the soils of russian northern taiga and subarctic tundra]. | the pcr analysis of dna extracted from soil samples taken in russian northern taiga and subarctic tundra showed that the dna extracts contain genes specific to methanotrophic bacteria, i.e., the mmox gene encoding the conserved alpha-subunit of the hydroxylase component of soluble methane monooxygenase, the pmoa gene encoding the alpha-subunit of particulate methane monooxygenase, and the mxaf gene encoding the alpha-subunit of methanol dehydrogenase. pcr analysis with group-specific primers als ... | 2002 | 12024830 |
| [utilization of methane and carbon dioxide by symbiotrophic bacteria in gills of mytilidae (bathymodiolus) from the rainbow and logachev hydrothermal fields on the mid-atlantic ridge]. | bivalve mollusks bathymodiolus asoricus and bathymodiolus puteoserpentis collected from the rainbow and logachev hydrothermal fields during dives of mir 1 and mir 2 deep-sea manned submersibles were studied. rates of methane oxidation and carbon dioxide assimilation in mussel gill tissue were determined by radiolabel analysis. during oxidation of 14ch4, radiocarbon was detected in significant quantities not only in carbon dioxide but also in dissolved organic matter, most notably 14c-formate and ... | 2002 | 12449636 |
| aerobic methanotrophic bacteria of cold ecosystems. | this review summarizes the recent advances in understanding the ecophysiological role and structure-function features of methanotrophic bacteria living in various cold ecosystems. the occurrence of methanotrophs in a majority of psychrosphere sites was verified by direct measurement of their methane-utilizing activity, by electron microscopy and immunofluorescent observations, and analyses of specific signatures in cellular phospholipids and total dnas extracted from environmental samples. surpr ... | 2005 | 16329925 |