KINETICS OF A STEPWISE PHOTOXIDATION OF ASCORBIC ACID BY A MANGANESE‐FLAVIN‐CATALASE SYSTEM*

1. Helianthus chloroplasts to which flavin, MnC12, catalase and ascorbic acid have been added catalyze the photoxidation in red light of ascorbic acid in a three‐step reaction with the absorption of not one but two equivalents of oxygen.

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