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- W1966551197 abstract "Manganese x-ray absorption spectra (XAS) are reported for the S{sub 1} state of highly purified, highly concentrated preparations of the oxygen-evolving complex (OEC) from photosystem II (PSII). Improvements in concentration (ca. 1.5 mM Mn) and detection efficiency (13-element solid-state detector array) have permitted a substantial improvement in data quality relative to previous solution XAS studies of PSII. Principal findings are that there is no need to include a shell of oxygens at ca. 1.75 {angstrom} in order to account for the Mn EXAFS, that there are 2-3 Mn-Mn distances of ca. 2.7 {angstrom}, and that there are one and possibly two shells of additional scatterers at longer distance (ca. 3.3 and 4.2 {angstrom}) from the Mn. Even with this higher quality data, it is not possible to use EXAFS to determine whether chloride is coordinated to the Mn. The structure consequences of these results are discussed in the context of proposed structural models. It is concluded that neither a cubane nor previously prepared butterfly type clusters can account for the observed features." @default.
- W1966551197 created "2016-06-24" @default.
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- W1966551197 date "1990-03-01" @default.
- W1966551197 modified "2023-09-26" @default.
- W1966551197 title "Structural characterization of the manganese sites in the photosynthetic oxygen-evolving complex using x-ray absorption spectroscopy" @default.
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- W1966551197 doi "https://doi.org/10.1021/ja00163a011" @default.
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