Abstract
Abstract Adenosine triphosphate synthesis resulting from the acid-base transition of chloroplasts is accompanied by an apparent adenosine triphosphate ⇄ water exchange characteristic of the light-induced synthesis. This adds considerably to the evidence that the phosphorylation reaction of photophosphorylation is involved. Oxygens in the γ-phosphoryl group of the initial ATP formed by illumination of chloroplasts or of the ATP formed by acid-base transition of chloroplasts are not derived entirely from Pi and HOH. An unknown source of oxygen, which could represent an intermediate stage in photophosphorylation, thus participates in ATP formation.
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