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[A new approach to the problem of oxygen formation in photosynthesis].

A detailed quantum-mechanical analysis of the model of water oxidizing complex, based on recent X-ray data on the structure of PSII, was made. A mechanism of water oxidation was suggested and explained for the first time. The role of three manganese atoms that are not involved directly in water oxidation, the role of the cubic structure of the complex, and the necessity of the presence of calcium and chlorine atoms during water oxidation are discussed. Theoretical computations of the energies of the complex in each S-state were made.