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- W102710487 abstract "This chapter presents an overview of the potential of H2 production by photosynthetic preparations from chloroplasts and cyanobacteria. From the results obtained from studies, it is concluded that the heterocysts of the cyanobacteria, N. muscorum, and A. cylindrica contain an active reversible hydrogenase. Because the consumption is greater than H2 production in heterocysts, this system may serve to regulate the channeling of electrons from molecular H2 to nitrogenase in these cells. Heterocysts are relatively poorly permeable to external reductants; thus, gaseous H2 is the hydrogen donor par excellence, providing a readily permeable form of reducing power. Both hydrogenase and nitrogenase are present in heterocysts. Nitrogenase catalyzes N2 fixation to NH and H2 evolution that decreases the yield of N2 fixation. In the absence of artificial mediators like methylviologen, the hydrogenase of heterocysts would function unidirectionally, that is, H2 uptake. Thus, H2 uptake by hydrogenase in heterocysts could be important in augmenting the rate and efficiency of N2 fixation in the cyanobacteria by establishing a mechanism for recycling reducing power in the form of H2 lost by the leak in nitrogenase." @default.
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- W102710487 date "1977-01-01" @default.
- W102710487 modified "2023-09-27" @default.
- W102710487 title "THE POTENTIAL OF H2 PRODUCTION BY PHOTOSYNTHETIC PREPARATIONS FROM CHLOROPLASTS AND CYANOBACTERIA" @default.
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- W102710487 doi "https://doi.org/10.1016/b978-0-7204-0629-0.50016-6" @default.
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