21. "Methanosarcina " are the world's most diverse methanogens in terms of ecology. 22. This pathway is also used for carbon fixation by autotrophic sulfate-reducing bacteria and hydrogenotrophic methanogens . 23. Ftr from the thermophilic methanogen " Methanopyrus kandleri " ( which has an optimum dimer interface. 24. The methanogen " Methanopyrus kandleri " ( Kurr, 1991 ) was named in honor of Kandler. 25. Methanogens produce a gas which is much richer in the lighter carbon-12 than the products of serpentization.26. Methane produced from marine methanogens is typically more D-enriched than methane produced from methanogens grown in freshwater. 27. Methane produced from marine methanogens is typically more D-enriched than methane produced from methanogens grown in freshwater. 28. Most methanogens are autotrophic producers, but those that oxidize CH 3 COO " are classed as chemotroph instead. 29. Most of these proteins are related to methanogenesis, and they could serve as potential molecular markers for the methanogens . 30. Hence, the unique shared presence of large numbers of proteins by all methanogens could be due to lateral gene transfers.
