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- W2124277890 abstract "Methyl viologen (10 μM) markedly inhibited acetylene reduction (nitrogen fixation) by old but not young cultures of Gloeocapsa sp. LB795, apparently by causing the alga to produce H2O2. H2O2 inhibited acetylene reduction when added to cultures at concentrations greater than 10 μM. As catalase (EC 1.11.1.6) is not present in Gloeocapsa sp. LB795, H2O2 is probably removed by a non-enzymic reaction with ascorbate and also by an enzyme-catalysed reaction with glutathione. Enzymes catalysing the decomposition of H2O2, were most active in young cells which were therefore better able than old cells to metabolize H2O2 produced in the presence of methyl viologen. The maximum activities of these enzymes coincided with maximum nitrogenase activity during the growth of batch cultures, and may provide a protective mechanism for nitrogenase." @default.
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- W2124277890 date "1979-04-01" @default.
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- W2124277890 title "The Effects of Methyl Viologen on Gloeocapsa sp. LB795 and Their Relationship to the Inhibition of Acetylene Reduction (Nitrogen Fixation) by Oxygen" @default.
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- W2124277890 doi "https://doi.org/10.1099/00221287-111-2-313" @default.
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