Characterization of Three Thermophilic Strains of Methanothrix ("Methanosaeta") thermophila sp. nov. and Rejection of Methanothrix ("Methanosaeta") thermoacetophila

¹Fermentation Research Institute, Agency of Industrial Science and Technology, Tsukuba, Ibaraki 305
²Institute of Applied Microbiology, Japan
³Department of Agricultural Chemistry, Japan
⁴The University of Tokyo, Tokyo 113; Department of Civil Engineering, Tohoku Gakuin University, Tagajo-shi, Miyagi 9854, Japan
⁵Department of Chemistry, University of Occupational and Environmental Health, Japan, Yahatanishi-ku, Kitakyushu 807, Japan