The light excitation of P-960 results in the oxidation of P-960 and the reduction of P-800 (bacteriophytin b-800) in the reaction centers from Rhodopseudomonas viridis. A negative 847 nm band of the circular dichroism psectrum disappears under P-960 photooxidation, while a positive 827 nm band disappears under P-800 photoreduction. Exciton interaction of the pigment molecules in the reaction center is discussed.
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