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Years of genetic, biochemical, and structural work have provided a number of insights into the oxygen evolving complex (OEC) of Photosystem II (PSII) for a variety of photosynthetic organisms. However, questions still remain about the functions and interactions among the various subunits that make up the OEC. After a brief introduction to the individual subunits Psb27, PsbP, PsbQ, PsbR, PsbU, and...
Leaves of Spinacia oleracea inoculated with tobacco mosaic virus (TMV) strain PV230 develop mild chlorotic and mosaic symptoms of infection. Thylakoid membranes isolated from these infected leaves showed a reduced F v /F m ratio for chlorophyll fluorescence kinetics, at 25 o C. The photosystem II (PS Il)-mediated electron-transport rate was inhibited 50%, whereas PS I activity...
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