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Photosynthetic splitting

The higher plant represents a spatially divided system (organs, tissues, cells, cell compartments) that forms distinct groups of organic compounds in each part. The fundamental reaction is the photosynthetic splitting of water in shoots. The derived hydro-... [Pg.279]

Zero field splitting (zfs) values in photoexcited triplets of primary donor bacteriochlorophyll a in photosynthetic bacteria are much lower than those found for vitro BChla triplets. There is a pronounced difference in kinetics of population and depopulation of the triplet sublevels as well. The differences have been attributed to the effect of BChla dimerization and it is now generally accepted that the primary electron donor in photosynthetic bacteria consists of a BChla dimer (special pair)(l- ). [Pg.140]

Four Steps Involved in Oxidation of Water The photosynthetic process in green plants consists of splitting the elements of water, followed by reduction of carbon dioxide. [Pg.87]

Photosystem II (Fig. 1) bears many similarities to the much simpler reaction center of purple bacteria. Remarkable is, however, the increase in complexity at the protein level. In a recent review on the evolutionary development of the type 11 reaction centres340 this was attributed to the invention of water-splitting by PS II and the necessity to protect and repair the photosynthetic machinery against the harmful effects of molecular oxygen. The central part of PS II and the bRC show a highly conserved cofactor arrangement,19 see Fig. 1. These cofactors are arranged in two branches bound to two protein subunits, L/M and D1/D2 in bRC and PS II, respectively. On the donor side a closely related pair of chlorophylls or bacteriochlorophylls exists the acceptors comprise monomeric chlorophylls, pheophytins (Ph) and 2 quinones QA and QB. Qa and Qb are plas-... [Pg.207]


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See also in sourсe #XX -- [ Pg.279 ]




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Summary Principles of Photosynthetic Water Splitting

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