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  • 1
    Electronic Resource
    Electronic Resource
    H2-Photoproduction by green algae: The significance of anaerobic pre-incubation periods and of high light intensities for H2-photoproductivity ofChlorella fusca (1982)
    Springer
    Archives of microbiology 132 (1982), S. 82-86 
    Details
    ISSN: 1432-072X
    Keywords: Green alga ; Chlorella fusca ; H2-photoproduction ; Light saturation ; Adaptation period ; Initial burst kinetic ; Oxygen scavenger
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using sodium-dithionite as an oxygen scavenger, the influences of different light intensities and periods of anaerobic pre-incubation in the dark on H2-photoproductivity were studied with the green algaChlorella fusca. By measuring hydrogen production in the light using manometric and gas chromatographic methods the effectiveness of sodium dithionite in stabilizing photoproduction was established. For high rates of H2-photoproduction high light intensities up to 30,000 lux (580 W m-2) were necessary; these are comparable to those required for light saturation of oxygen photoproduction by this alga. AlthoughChlorella fusca produces H2 immediately after transition to anaerobic conditions, the optimum rate of H2 production was reached after a 5 h dark adaptation period only. The results obtained are discussed with respect to characteristics of H2-photoproduction by green algae: the initial burst kinetics, the light saturation, and the obligate period of anaerobic adaptation. It is concluded that H2-photoproduction byChlorella is an anaerobic photosynthetic process which occurs in the absence of CO2 and can be experimentally stabilized by exogenous oxygen scavengers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690823
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  • 2
    Electronic Resource
    Electronic Resource
    Improving the photosynthetic H2-productivity of the green alga Chlorella fusca by physiologically directed O2 avoidance and ammonium stimulation (1986)
    Springer
    Archives of microbiology 144 (1986), S. 25-28 
    Details
    ISSN: 1432-072X
    Keywords: Chlorella fusca ; Greening ; H2-Photoproduction ; Ammonium stimulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Low production rates and sensitivity to O2 are two major obstacles which prevent the technical exploitation of the ability of green algae to produce H2 from water. Both problems were addressed in the present work. The inhibitory effect of O2 on the hydrogen photoproduction of the green alga Chlorella fusca could be minimized by using algal cells which had not yet fully restored their oxygen evolving capacities after an artificially induced chloroplast de/regeneration cycle (de-/regreening). The H2 photoproductivity peaked after 30 h of greening light while the O2 evolution at this time reached only 59% of its normal capacity. The H2PP yields could be further increased if NH4Cl was added to the reaction medium at the beginning of the anaerobic preincubation period. No stimulatory effect was observed when NH4Cl was added just before illumination, i.e. at the end of the 5-h-preincubation period. It is assumed that NH4Cl inhibited the photosynthetic reduction of nitrite, which competed with hydrogen photoproduction indirectly by feedback repression of the NO 2 - /NO 3 - -reductive system. The impacts of the given results on an optimized H2-production in green algae based on photosynthesis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454951
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    Paper (German National Licenses)
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