单词	methanogen
释义	methanogen /ˈmɛθənə(ʊ)dʒ(ə)n / /mɛˈθanə(ʊ)dʒ(ə)n/ noun Biology A methane-producing bacterium, especially an archaean which reduces carbon dioxide to methane.Dog feces naturally contain bacteria called methanogens, which use hydrogen to break down carbon dioxide into microbial food.... Methane is formed by a unique group of anaerobic bacteria belonging to the Archaea, the methanogens. Since the discovery that methanogens belong to the Archaea and not to the Bacteria, a number of other archaeal groups have been discovered. Derivatives methanogenic /mɛθənə(ʊ)ˈdʒɛnɪk/ /məˈθənə(ʊ)ˌdʒɛnɪk/ adjective ... The association between anaerobic heterotrichous ciliates and endosymbiotic methanogenic archaea depends on the presence of hydrogenosomes that provide intracellular hydrogen as a substrate for methane formation. Until recently, the distribution of these functions has been limited to methanogenic archaea and methylotrophic proteobacteria, and their evolutionary history remained obscure. Sulfate-reducing bacteria directly compete with methanogenic bacteria for vital substrates, such as hydrogen and acetate.
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