Reversible photochemical reduction of chlorophyll and its analogues and derivatives

CONTENTS
I. Introduction 344
II. Reversible photoreduction 345
III. Oxidation–reduction reactions photosensitised by chlorophyll 352
IV. Photochemical reactions of colloidal solutions of chlorophyll 354
V. Photochemical properties of chlorophyll in the granules of chloroplasts 354
VI. Reversible photochemical changes undergone by chlorophyll in the living plant leaf 354
VII. Reversible photoreduction and possible mechanism of the participation of chlorophyll and its analogues in photobiological processes 355
VIII. Conclusion 356