Feedback controlling oxygen production in a cross-reaction between two photosystems in photosynthesis |
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Authors: | B. Diner D. Mauzerall |
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Affiliation: | Rockefeller University, New York, N.Y. 10021 U.S.A. |
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Abstract: | The non-linear light-saturation curve for oxygen production in both Chlorella vulgaris and Phormidium luridium at low light intensities, under anaerobic conditions is shown to be caused by the reduction of a pool of electron carriers coupled to both an endogenous reducing agent R, and to oxygen. The light dependence of oxygen production in these algae was studied by a repetitive-flash method, which allows a direct analysis of the steady-state kinetics of pool reduction. We propose a kinetic model which quantitatively accounts for these kinetics and several transient phenomena. This model centers on a novel cross reaction at the pool of photo and dark electron input and output, allowing a delicate poising of oxygen production by the environment. This model shows a positive feedback of oxygen on oxygen production. |
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Keywords: | PMS phenazine methosulfate DCMU 3-(3,4-dichlorophenyl)-1,1-dimethylurea |
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