%0 Journal Article %A Henderson, C. %T The Influence of Extracellular Hydrogen on the Metabolism of Bacteroides ruminicola, Anaerovibrio lipolytica and Selenomonas ruminantium %D 1980 %J Microbiology, %V 119 %N 2 %P 485-491 %@ 1465-2080 %R https://doi.org/10.1099/00221287-119-2-485 %I Microbiology Society, %X Strains of three anaerobic rumen bacteria, Bacteroides ruminicola, Anaerovibrio lipolytica and Selenomonas ruminantium, were able to use extracellular H2 to reduce fumarate to succinate. Each bacterium possessed membrane-bound hydrogenase and fumarate reductase activity. Membrane-bound cytochrome b was reducible by H2 and oxidizable by fumarate in each bacterium. The apparent K m values for hydrogen of the hydrogenases were 4.5 10−6 m, 1.4 10−5 m and 4.4 10−5 m for B. ruminicola, A. lipolytica and S. ruminantium, respectively. The apparent K m values for fumarate of the fumarate reductases were approximately 1.0 10−4 m for each bacterium. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-119-2-485