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KINETIC STUDIES OF PHOTOSYSTEM II IN PHOTOSYNTHESIS *
Author(s) -
Joliot P.
Publication year - 1968
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1968.tb05889.x
Subject(s) - photosystem ii , photochemistry , photosynthetic reaction centre , photosynthesis , chemistry , kinetic energy , oxygen , quantum yield , kinetics , substrate (aquarium) , quantum , oxygen evolution , electron transport chain , chemical physics , electron transfer , physics , quantum mechanics , fluorescence , biology , ecology , biochemistry , organic chemistry , electrode , electrochemistry
— It appears that even if some kinetic aspects of the activation and stimulation phenomena of photosystem II remain not understood. the only interpretation we can propose involves the addition of the effect of two photoreactions on the same photochemical center. The main arguments we developed in favour of this hypothesis are: (1) the formation of one atom of oxygen requires the addition of the effect of two photo‐reactions (one photoreaction per electron). (2) after a dark period two quanta must be absorbed by the same photochemical center in order to produce oxygen. (3) the existence of a form of the photochemical substrate in which energy is stored is proved by the fact that. after a preillumination by two flashes, the quantum requirement for the production of one molecule of oxygen can reach a value almost two times lower than the quantum requirement measured in stationary conditions.