SUMMARY: Hydrogenomonas facilis lack hydrogenase activity when grown hetero- trophically, but these organisms develop hydrogenase activity when incubated, in phosphate buffer, under an atmosphere of 95 % (v/v) hydrogen + 5 % (v/v) air. The development of hydrogenase activity is inhibited by 2:4-dinitrophenol and by chloramphenicol. The development is also inhibited by the addition of sodium lactate or sodium acetate unless a nitrogen source (e.g. ammonium sulphate) is present.
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