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- W2495535767 abstract "A major breakthrough in our understanding of how plants oxidize water to molecular 02 was the discovery by P. Joliot and co-workers that the 02 yield per flash, in a series of light flashes, oscillates with a periodicity of 4. This led to the concept by B. Kok and co-workers that these reactions involve accumulation of four positive charges in independent centers, which undergo a series of changes in their redox state (the so-called S states). In the present paper, we have applied optical techniques (such as thermolumines- cence and delayed light emission, both discovered by W. Ar- nold and co-workers) to monitor charge storage on the 02- evolving system in leaves from higher plants. We observed a period of four oscillations in both thermoluminescence and de- layed light emission, with maxima on flashes 2 and 6, estab- lishing a relationship with the charge accumulation process in photosynthesis. These measurements provided additional new information: the deactivation of the centers, which cannot be measured by the 02 method in the leaves, is in the 20- to 30-s range; and in the dark-adapted leaves, the sec- ondary bound plastoquinone molecule (the so-called secondary electron acceptor QB) is in equal concentration in its reduced and oxidized forms. The origin of thermoluminescence and de- layed light emission, in terms of the recombination of charges on the 02-evolving and plastoquinone sides, is also discussed. In spite of some new developments, the chemistry of oxida- tion of water to molecular 02 remains a poorly understood" @default.
- W2495535767 created "2016-08-23" @default.
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- W2495535767 date "2016-01-01" @default.
- W2495535767 modified "2023-09-27" @default.
- W2495535767 title "Charge accumulation and photoche thermoluminescence and delayed li (photosynthesis/electron transfer/oxygen-evolving enzyme/deactivatih" @default.
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