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• W2034209803 abstract "Photosynthetic reaction centers isolated from Rhodopseudomonas sphaeroides strain R-26 were excited with non-saturating 7-ps, 600-nm flashes under various conditions, and the resulting absorbance changes were measured. If the quinone electron acceptor (Q) is in the oxidized state, flash excitation generates a transient state (PF), in which an electron has moved from the primary electron donor (P, a dimer of bacteriochlorophylls) to an acceptor complex involving a special bacteriopheophytin (H) and another bacteriochlorophyll (B). PF decays in 200 ps as an electron moves from H to Q. If Q and the acceptor complex are reduced photochemically before the excitation, the flash generates a different transient state of P with a high quantum yield. This state decays with a lifetime of 340 ps. There is no indication of electron transfer from P to B under these conditions, but this does not rule out the possibility that B is an intermediate electron carrier between P and H. Measurements of the yield of fluorescence from P under various conditions show that the 340 ps state is not the fluorescent excited singlet state of P. The transient state could be a triplet state, a charge-transfer state of P, or another excited singlet state that is not fluorescent." @default.
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• W2034209803 date "1981-04-01" @default.
• W2034209803 modified "2023-09-25" @default.
• W2034209803 title "Transient states in reaction centers containing reduced bacteriopheophytin" @default.
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• W2034209803 doi "https://doi.org/10.1016/0005-2728(81)90036-0" @default.
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