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Effect of H(2)-CO(2) on Methanogenesis from Acetate or Methanol in Methanosarcina Spp

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Date 1983 Aug 1
PMID 16346361
Citations 20
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Abstract

Growth of Methanosarcina sp. strain 227 and Methanosarcina mazei on H(2)-CO(2) and mixtures of H(2)-CO(2) and acetate or methanol was examined. The growth yield of strain 227 on H(2)-CO(2) in complex medium was 8.4 mg/mmol of methane produced. Growth in defined medium was characteristically slower, and cell yields were proportionately lower. Labeling studies confirmed that CO(2) was rapidly reduced to CH(4) in the presence of H(2), and little acetate was used for methanogenesis until H(2) was exhausted. This resulted in a biphasic pattern of growth similar to that reported for strain 227 grown on methanol-acetate mixtures. Biphasic growth was not observed in cultures on mixtures of H(2)-CO(2) and methanol, and less methanol oxidation occurred in the presence of H(2). In M. mazei the aceticlastic reaction was also inhibited by the added H(2), but since the cultures did not immediately metabolize H(2), the duration of the inhibition was much longer.

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