"0.375"^^ . . "101347858"^^ . "archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas"@en-us . "100884120"@en-us . "methanogen"@en-us . "0"^^ . "101273908"@en-us . . "archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas"@en-us . . . "methanogen"^^ . "01347858-n"^^ . . . . . .