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- W7687564 abstract "For photobiological hydrogen (H 2 ) production, cyanobacteria are among the ideal candidates because they grow with minimal nutritional requirements (only mineral salts and water), with sun light as the sole source of energy, and with H 2 and O 2 as the major products. In cyanobacteria, H 2 production is catalyzed by either nitrogenase or hydrogenase. The merits of the nitrogenase reaction are that H 2 production is simultaneous with photosynthetic O 2 evolution and no anaerobic treatment of the cells is required. One of the major obstacles to efficient photobiological production of H 2 in heterocystous cyanobacteria might be the presence of hydrogenases that reabsorb the H 2 produced by nitrogenase in the heterocysts. Many heterocystous cyanobacteria contain both uptake hydrogenase ( Hup ) and bidirectional (or reversible) hydrogenase ( Hox ) though a few have only Hup . In the experiment described in the chapter, three hydrogenase mutants from Anabaena sp. PCC 7120 (∆ hupL , ∆ hoxH , and ∆ hupL/ ∆ hoxH ) were constructed and the effects of deletion of hydrogenase genes on hydrogen production were evaluated. Disruption of uptake hydrogenase gene (∆ hupL mutant) was effective in elevating hydrogen productivity in Anabaena sp. PCC 7120 cells. The efficiency of visible light energy conversion to H 2 by the ∆ hupL mutant at its highest H 2 production stage was 1.0–1.6 % at an incident light intensity of 50 W/m 2 ." @default.
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- W7687564 date "2004-01-01" @default.
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- W7687564 title "Photobiological Hydrogen Production by Cyanobacteria Utilizing Nitrogenase Systems -Present Status and Future Development-" @default.
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- W7687564 doi "https://doi.org/10.1016/b978-008044356-0/50007-5" @default.
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