Charge Recombination and Thermoluminescence in Photosystem II
نویسندگان
چکیده
منابع مشابه
Charge recombination and thermoluminescence in photosystem II.
In the recombination process of Photosystem II (S(2)Q(A)(-)-->S(1)Q(A)) the limiting step is the electron transfer from the reduced primary acceptor pheophytin Ph(-) to the oxidized primary donor P(+) and the rate depends on the equilibrium constant between states S(2)PPhQ(A)(-) and S(1)P(+)Ph(-)Q(A). Accordingly, mutations that affect the midpoint potential of Ph or of P result in a modified r...
متن کاملKinetics and pathways of charge recombination in photosystem II.
The mechanism of charge recombination of the S(2)Q(A)(-) state in photosystem II was investigated by modifying the free energy gap between the quinone acceptor Q(A) and the primary pheophytin acceptor Ph. This was done either by changing the midpoint potential of Ph (using mutants of the cyanobacterium Synechocystis with a modified hydrogen bond to this cofactor), or that of Q(A) (using differe...
متن کاملEvidence from Thermoluminescence for Bicarbonate Action on the Recombination Reactions Involving the Secondary Quinone Electron Acceptor of Photosystem Ii
In this paper, we present the first measurements on thermoluminescence from isolated thylakoids to probe the recombination reactions of S 2 (or possibly $3) with Q ~ or QA, after bicarbonate depletion and its readdition. The effects of bicarbonate depletion on the S2Q ~ (or 8 3 0 ~ ) thermoluminescence band was (1) a 6 1 0 ° C shift to a higher temperature; (2) a reduction in its intensity upon...
متن کاملInvestigations of Charge Carrier Trapping and Recombination in Electroluminescent and Photoconducting Polymers by Means of Thermoluminescence
Phone: (+ 48 42) 631 32 16; Fax: (+48 42) 631 32 18; E-mail: [email protected] Fraunhofer Institute for Applied Polymer Research, D-14476 Golm, Germany University of Potsdam, Institute of Physics, D-14469 Potsdam, Germany SONY International GmbH, Materials Science Laboratories, D-70327 Stuttgart, Germany University of Wuppertal, Institute of Chemistry, D-42097 Wuppertal, Germany 6 Max-Pla...
متن کاملTwo different charge separation pathways in photosystem II.
Charge separation is an essential step in the conversion of solar energy into chemical energy in photosynthesis. To investigate this process, we performed transient absorption experiments at 77 K with various excitation conditions on the isolated Photosystem II reaction center preparations from spinach. The results have been analyzed by global and target analysis and demonstrate that at least t...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 2005
ISSN: 0006-3495
DOI: 10.1529/biophysj.104.050237