Competition between light and dark Metabolism in Rhodospirillum rubrum
Clayton, Roderick K.
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Rhodospirillum rubrum in the dark carries op.t a respiratory metabolism; the oxidation, by O2, of an organic substrate provides energy which is needed for anabolic processes. In strong light the metabolism is strictly photosynthetic; the organic substrate donates hydrogen to an oxidizing substance produced in photosynthesis, and no uptake of oxygen is observe!i. These ,processes have been discussed in detail in an earlier paper (CLAYTON 1955}; one can anticipate that in weak light a competition will exist between photosynthetic and respiratory metabolism: hydrogen from the substrate will be transferred partly to the oxidizing substance of photosynthesis and partly to molecular oxygen. The purpose of the present paper is to describe this competition quantitatively.
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