Molecular detection of methanogenic archaea in the Black Sea oxidized watersстатья
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Дата последнего поиска статьи во внешних источниках: 26 августа 2016 г.
Аннотация:Methanogenic archaea are traditionally considered strictly anaerobic microorganisms. However, some methanogens, which possess the enzymatic mechanisms of antioxidative defense, may survive at low oxygen concentrations and retain their activity in the anoxic microniches formed within oxic habitats (e.g., diatom shells, copepod fecal pellets, and other detrital microparticles). Earlier, radioisotope analysis revealed methanogenesis not only in anoxic waters, but also in the oxidized surface waters of the Black Sea. The presence of viable archaea in the Black Sea surface waters and in the chemocline zone was originally demonstrated using fluorescence in situ hybridization (FISH). Subsequent FISH investigation of the Black Sea oxic waters revealed the presence of physiologically active methanogenic archaea of subgroups I (genera Methanobacterium, Methanobrevibacter, and Methanosphaera) and II (order Methanomicrobiales). The goal of the present work was to detect methanogenic archaea in the oxic water column and in the chemocline zone of the Black Sea using PCR analysis.