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- W2009783969 abstract "The intact photosystem I of maize containing its full antenna complement (PSI-200) has been purified and fractionated into the core and outer antenna (LHCI) components. It is demonstrated by absorption and fluorescence spectroscopy that at least 80% of the long wavelength absorbing antenna pigments (red forms) are located in LHCI. Absorption spectra in the Qy region of all three preparations were measured between 72 and 300 K and subjected to a thermal broadening analysis. Data are interpreted in the linear electron-phonon coupling assumption, and the average optical reorganization energy (Snum) for the bulk pigment band and the red absorption tail determined. A marked asymmetry in Snum values across the absorption band is demonstrated. The bulk pigments in all three preparations have rather low values, in the range of 15-25 cm-1, suggesting that Stokes shifts for the absorption forms are in the 1. 5-3 nm range. On the other hand the red forms have markedly greater reorganization energies. While a direct thermal analysis of the red tail indicates minimum Snum values of around 60 cm-1, when the contribution of the red tail of the bulk pigments is corrected for in LHCI, the more reliable value of 110 cm-1 is obtained. These high Snum values for the red pigment forms suggest that they have unusually wide homogeneously broadened absorption bands and large Stokes shifts (6-11 nm)." @default.
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- W2009783969 date "1998-11-20" @default.
- W2009783969 modified "2023-10-16" @default.
- W2009783969 title "A Thermal Broadening Study of the Antenna Chlorophylls in PSI-200, LHCI, and PSI Core" @default.
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- W2009783969 doi "https://doi.org/10.1021/bi9813227" @default.
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