Carbon Isotope Fractionation during Acetoclastic Methanogenesis by Methanosaeta concilii in Culture and a Lake Sediment

摘要

The isotope enrichment factors (ɛ) in Methanosaeta concilii and in a lake sediment, where acetate was consumed only by Methanosaeta spp., were clearly less negative than the ɛ usually observed for Methanosarcina spp. The fraction of methane produced from acetate in the sediment, as determined by using stable isotope signatures, was 10 to 15% lower when the appropriate ɛ of Methanosaeta spp. was used.