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Methanosarcina barkeri 227 andMethanosarcina mazei S-6 grew with acetate as the substrate; we found little effect of H2 on the rate of aceticlastic growth in the presence of various H2 pressures between 2 and 810 Pa. We used physical (H2 addition or flushing the headspace to remove H2 ) and biological (H2 -producing or -utilizing bacteria in cocultures) methods for controlling H2 pressure inMethanosarcina cultures growing on acetate. Added H2 (ca. 100 Pa) was removed rapidly (a few hours) byM. barkeri and slowly (within a day) byM. mazei . When the H2 produced by the aceticlastic methanogens was removed by coculturing with an H2 -usingDesulfovibrio sp., the H2 pressure was about 2.2 Pa. Under these conditions the stoichiometry of aceticlastic methanogenesis did not change. H2 -grown inocula ofM. barkeri grew with acetate as the sole catabolic substrate if the inoculum culture was transferred during logarithmic growth to acetate-containing medium or if the transfer was accomplished within 1 or 2 days after exhaustion of H2 . H2 -grown cultures incubated for 4 or more days after exhaustion of H2 were able to grow with H2 but not with acetate as the sole catabolic substrate. Addition of small quantities of H2 to acetate-containing medium permitted these cultures to initiate growth on acetate.

Effects of Hydrogen Pressure during Growth and Effects of Pregrowth with Hydrogen on Acetate Degradation by Methanosarcina Species