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Die Effizienz der photobiologischen Energiekonversion auf unterschiedlichen Systemebenen. Die potentielle H2-Produktion durch photoautotrophe Pflanzen und Konsequenzen für die globalen CO2- und O2-Kreisläufe

Biologische Wasserstoffgewinnung: Forschungsbegleitende Technikfolgenabschätzung. Abschlußbericht zum Teilauftrag "Systematische Untersuchung der Umwandlungseffizienzen für die photobiologische Wasserstoffproduktion und ergänzende Arbeiten im Bereich der Folgenabschätzungen"
: Rank, B.; Hoffmann, P.; Wiedenroth, E.-M.
: Humboldt-Universität zu Berlin, Institut für Allgemeine Botanik; Fraunhofer-Institut für Systemtechnik und Innovationsforschung -ISI-, Karlsruhe

Karlsruhe: ISI, 1995, 98 pp.
Fraunhofer ISI ()
energy efficiency; quantum efficiency; foreign technology; energy balance; renewable energy source; environmental impact; biophotolysis; hydrogen production

Hydrogen can be produced by a number of processes, ranging from water electrolysis by means of electrical energy to photobiological hydrogen generation by means of solar energy with the aid of autotrophic organisms. In the latter case, a closed hydrogen cycle might be harnessed. Whether industrial-scale hydrogen generation and harnessing of hydrogen as an energy source will be madeuse of in the future by the energy industry depends decisively on the effectiveness of the processes in debate and the environmental compatibility of their consequences.- In the case of non-biological techniques, this problem needs to be solved at the technical and physical level only. But where photobiological hydrogen generation is concerned, the possibilities and limits of energy conversion resulting from the characteristics of the organisms' photosynthesis apparatus need to be considered. This holds good especially of the following properties of their photosynthesis apparatus efficiency of energy conversion at different system levels, dependence of energy conversion on exogenous factors (as exemplified by plants adapted to dark and plants adapted to light), energy consumption through growth and respiration processes, specificity of radiation-induced conversion depending on the biological species, regulatory linkage of light reaction and carbondioxide fixation in the Calvin cycle.