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- W1984343886 abstract "The excitation transport and trapping kinetics of core antenna-reaction center complexes from photosystem I of wild-type Synechocystis sp. PCC 6803 were investigated under annihilation-free conditions in complexes with open and closed reaction centers. For closed reaction centers, the long-component decay-associated spectrum (DAS) from global analysis of absorption difference spectra excited at 660 nm is essentially flat (maximum amplitude <10−5 absorbance units). For open reaction centers, the long-time spectrum (which exhibits photobleaching maxima at ∼680 and 700 nm, and an absorbance feature near 690 nm) resembles one previously attributed to (P700+ - P700). For photosystem I complexes excited at 660 nm with open reaction centers, the equilibration between the bulk antenna and far-red chlorophylls absorbing at wavelengths >700 nm is well described by a single DAS component with lifetime 2.3 ps. For closed reaction centers, two DAS components (2.0 and 6.5 ps) are required to fit the kinetics. The overall trapping time at P700 (∼24 ps) is very nearly the same in either case. Our results support a scenario in which the time constant for the P700 → A0 electron transfer is 9–10 ps, whereas the kinetics of the subsequent A0 → A1 electron transfer are still unknown." @default.
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- W1984343886 date "2000-09-01" @default.
- W1984343886 modified "2023-10-12" @default.
- W1984343886 title "Ultrafast Primary Processes in PS I from Synechocystis sp. PCC 6803: Roles of P700 and A0" @default.
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- W1984343886 doi "https://doi.org/10.1016/s0006-3495(00)76408-3" @default.
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