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To study how microbes establish themselves in a mammalian gut environment, we colonized germ-free mice with microbial communities from human, zebrafish, and termite guts, human skin and tongue, soil, and estuarine microbial mats. Bacteria from these foreign environments colonized and persisted in the mouse gut; their capacity to metabolize dietary and host carbohydrates and bile acids correlated with colonization...
Cell suspensions of Methanobrevibacter arboriphilus catalyzed the reduction of O2 with H2 at a maximal specific rate of 0.4 U (μmol/min) per mg protein with an apparent Km for O2 of 30 μM. The reaction was not inhibited by cyanide. The oxidase activity was traced back to a coenzyme F420-dependent enzyme that was purified to apparent homogeneity and that catalyzed the oxidation of 2 F420H2 with 1...
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