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Biological solar energy conversion: approaches to overcome yield, stability and product limitations. Progress report no. 1, 1 Apr--30 Sep 1975

Technical Report ·
OSTI ID:7247132
; ; ;
We have studied the stability of electron transport during aging of isolated chloroplasts with and without gluteraldehyde fixation. Photosystem I activity proved quite stable - as expected. Photosystem II activity was more labile; it had a half life about 3 days at 4, about 1 day at 20 degrees. The site most sensitive to aging proved to be close to the photochemical apparatus of System II (rather than the O/sub 2/ evolution system or the chain between the photoacts). Gluteraldehyde treatment caused an about 5 fold decline of the O/sub 2/ evolution capacity with hydrophilic electron acceptors. System I activity was decreased to the same extent. Little inhibition was observed with the lipophilic acceptor p-phenylenediamine. Gluteraldehyde treatment slowed down the decay of photochemical (O/sub 2/ evolution) activity during dark storage of chloroplasts to half lives of about 20 days at 4 and about 3 days at 20 degrees. A mass spectrometer system was assembled to measure exchange in algae. Adapted algae showed high rates of H-D exchange (hydrogenase activity).
Research Organization:
Martin Marietta Labs., Baltimore, Md. (USA)
OSTI ID:
7247132
Report Number(s):
PB-252925; MML-TR-75-38c
Country of Publication:
United States
Language:
English

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Related Subjects

09 BIOMASS FUELS
140504* -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
AGING
ALGAE
BIOMASS
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHLOROPLASTS
CONVERSION
ENERGY CONVERSION
ENERGY SOURCES
OSMOSIS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RENEWABLE ENERGY SOURCES
SOLAR ENERGY CONVERSION
STABILITY
SYNTHESIS