Abstract
Few unicellular or filamentous heterocystous cyanobacteria have been shown to photoevolve molecular hydrogen under anaerobic conditions. The phenomenon as such can be relevant in the future under the aspects of hydrogen as being an extremely clean and efficient fuel. For this reason light-induced hydrogen evolution has become an increasingly important topic in scientific research [1-6]. Hydrogen evolution is in part based on the function of the nitrogenase system for the fixation of atmospheric nitrogen in the respective organism necessary for the nitrogen supply under nitrogen-limiting conditions. In other cases hydrogenase systems have been described which catalyze the oxidation of hydrogen as an uptake hydrogenase or which can act as a reversible hydrogenase using hydrogen as an electron source under specific conditions and reducing protons depending on the redox situation of the cells.
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