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Hydrogen production by the rumen protozoon, Dasytricha ruminantium was reversibly inhibited at O 2 tensions < 2.8 μmol/1. At higher O 2 concentrations irreversible inactivation of the hydrogenase system was observed. In the rumen, H 2 generation is likely to be determined by O 2 concentration since the physiological levels of O 2 in the rumen are in the range 0–1.5 μmol/1.
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Yarlett et al. (1983) studied this question.
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