Other
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975orli....6..253k&link_type=abstract
Origins of Life, Volume 6, Issue 1-2, pp. 253-256
Other
Scientific paper
It is generally accepted that two photosystems function successively in photosynthetic electron transport chain of plants and algae. The interaction of these photosystems results in the enhancement of photosynthesis. It was suggested that only one photosystem is present in purple bacteria, the most primitive photosynthetic organisms. The functioning of this photosystem is accompanied by absorption changes at 890 nm. Recently new spectral changes were found inChromatium chromatophores under reductive conditions, more favorable for bacterial growth. Some of that spectral changes take place even atliquid nitrogen temperature. It is proposed these absorption changes could be related to other photosystem functioning in low potential region. Such a photosystem is necessary for reduction of NAD inChromatium, for which the reverse electron transport to NAD was not shown. In contrast to photosystems of plants, the bacterial photosystems appear to function independently because the enhancement of bacterial photosynthesis is not found. Apparently the evolution of photosystems involved interaction between independent photosystems, one of them functioning under more oxidative conditions.
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