Reducing power generated in the second photoact of photosynthesis.

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Abstract
The photochemical activities of cell free prepara -tions of Bishop''s Scenedesmus mutant no. 8, were compared with those of the wild type strain and of spinach chloroplasts. The data were largely consistent with the assumption that the mutant lacks photosystem I of photocynthesis. Whereas high potential oxidants such as ferricyanide and benzoquinone sustained oxygen evolution with good yield, lower potential oxidants were reduced with a poor quantum efficiency. A comparative study of a number of oxidants having different normal potentials was made. A distinct transition from hig to low quantum yield occurred at a potential value of E''o - + 0.18 volt. It was assumed that this potential is equal or close to the normal potential of the primary photoreductant generated in photoact II of photosynthesis.