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• W2003176046 endingPage "98" @default.
• W2003176046 startingPage "91" @default.
• W2003176046 abstract "The average fluorescence decay lifetimes, due to reaction centre photochemical trapping, were calculated for wavelengths in the 690- to 770-nm interval from the published fluorescence decay-associated emission spectra for Photosystem I (PSI)-light-harvesting complex of Photosystem I (LHCI) [Biochemistry 39 (2000) 6341] at 280 and 170 K. For 280 K, the overall trapping time at 690 nm is 81 ps and increases with wavelength to reach 103 ps at 770 nm. For 170 K, the 690-nm value is 115 ps, increasing to 458 ps at 770 nm. This underlines the presence of kinetically limiting processes in the PSI antenna (diffusion limited). The explanation of these nonconstant values for the overall trapping time band is sought in terms of thermally activated transfer from the red absorbing states to the bulk acceptor chlorophyll (chl) states in the framework of the Arrhenius-Eyring theory. It is shown that the wavelength-dependent activation energies come out in the range between 1.35 and 2.7 kcal mol(-1), increasing with the emission wavelength within the interval 710-770 nm. These values are in good agreement with the Arrhenius activation energy determined for the steady-state fluorescence yield over the range 130-280 K for PSI-LHCI. We conclude that the variable trapping time in PSI-LHCI can be accounted for entirely by thermally activated transfer from the low-energy chl states to the bulk acceptor states and therefore that the position of the various red states in the PSI antenna seems not to be of significant importance. The analysis shows that the bulk antenna acceptor states are on the low-energy side of the bulk antenna absorption band." @default.
• W2003176046 created "2016-06-24" @default.
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• W2003176046 date "2003-03-01" @default.
• W2003176046 modified "2023-10-01" @default.
• W2003176046 title "The photochemical trapping rate from red spectral states in PSI–LHCI is determined by thermal activation of energy transfer to bulk chlorophylls" @default.
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• W2003176046 doi "https://doi.org/10.1016/s0005-2728(02)00399-7" @default.
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