H2 metabolism in photosynthetic organisms. II. Light-dependent H2 evolution by preparations from Chlamydomonas, Scenedesmus and spinach. |
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Authors: | A Ben-Amotz M Gibbs |
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Institution: | Department of Biology, Brandeis University, Waltham, Mass. 02154 USA |
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Abstract: | Light-dependent H2 evolution from dithiothreitol as electron donor was observed with cell-free preparations of anaerobically adapted and from spinach chloroplasts mixed with hydrogenase. NADH substituted for dithiothreitol as electron donor only in the preparation. Dibromothymoquinone, an antagonist of plastoquinone, selectively inhibited H2 photoevolution from NADH. These results are interpreted as indicating that 3-(3,4-dichlorophenyl)-1,1-dimethyl urea insensitive H2 photoevolution by algae containing hydrogenase is due to the capability of NADH to reduce plastoquinone in the electron transport chain, and to evolve H2 by a low redox potential carrier of photosystem I. |
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Keywords: | DBMIB dibromothymoquinone DCMU 3-(3-4-dichlorophenyl)-1 1-dimethyl urea CH1 chlorophyll |
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