It is the organism syntrophic with methanogens. Methanobacterium bryantii (formerly known as M. omelianskii) was kept in culture collection for 26 years after its original description is 1941 before it was revealed to be syntrophic association of the methanogen proper and fermentative “S” organism. The “S” organism and syntrophic fermenters of similar type were later classified and named Syntrophomonas and Syntrophobacter Both these genera are hydrogen process and need the presence of methanogens as hydrogen removers called mutualism based hydrogen transfer.

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