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- W1998455718 abstract "We compared the temperature dependency of the rate of the charge recombination reaction in photoreaction centers isolated from Ectothiorhodospira sp. and from Rhodospirillum rubrum G9. We also examined the temperature dependency of the bandwidth and peak wavelength of their far-red absorption band. In both preparations, the peak wavelength and the bandwidth vary monotonically with temperature between 80 and 300 K. However, the rate of the charge recombination reaction has a quite different temperature dependency. In the preparation from R. rubrum, the reaction is accelerated 5-fold in a typical sigmoidal fashion as the temperature is lowered from 300 to 80 K. In the preparation from Ectothiorhodospira sp., the reaction is accelerated monotonically only about 1.5-fold in the same temperature range. At temperatures below 100 K, the rates are similar in the two preparations. We interpret the temperature dependency of the charge recombination reaction in terms of an activationless electron-transfer model formulated by Jortner (Jortner, J. (1980) Biochim. Biophys. Acta 394, 193–230). The minimal model provides a good fit for the temperature dependency of charge recombination in the preparation from Ectothiorhodospira sp. However, to fit the temperature dependency of the R. rubrum preparation with the same model, we must further postulate that the electronic coupling factor varies with temperature in this preparation. We find that, in both preparations, the temperature dependency of the far-red absorption bandwidth is consistent with the assumption that similar vibrational modes are involved in electron transfer and in electronic excitation." @default.
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- W1998455718 date "1983-09-01" @default.
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- W1998455718 title "Different temperature dependencies of the charge recombination reaction in photoreaction centers isolated from different bacterial species" @default.
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- W1998455718 doi "https://doi.org/10.1016/0005-2728(83)90090-7" @default.
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