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- W2001087663 abstract "In this paper the model and simulation of primary photochemical and photo-electrochemical reactions in dark-adapted intact plant leaves is presented. A descriptive algorithm has been derived from analyses of variable chlorophyll a fluorescence and P700 oxidation kinetics upon excitation with multi-turnover pulses (MTFs) of variable intensity and duration. These analyses have led to definition and formulation of rate equations that describe the sequence of primary linear electron transfer (LET) steps in photosystem II (PSII) and of cyclic electron transport (CET) in PSI. The model considers heterogeneity in PSII reaction centers (RCs) associated with the S-states of the OEC and incorporates in a dark-adapted state the presence of a 15-35% fraction of Q(B)-nonreducing RCs that probably is identical with the S₀ fraction. The fluorescence induction algorithm (FIA) in the 10 μs-1s excitation time range considers a photochemical O-J-D, a photo-electrochemical J-I and an I-P phase reflecting the response of the variable fluorescence to the electric trans-thylakoid potential generated by the proton pump fuelled by CET in PSI. The photochemical phase incorporates the kinetics associated with the double reduction of the acceptor pair of pheophytin (Phe) and plastoquinone Q(A) [PheQ(A)] in Q(B) nonreducing RCs and the associated doubling of the variable fluorescence, in agreement with the three-state trapping model (TSTM) of PS II. The decline in fluorescence emission during the so called SMT in the 1-100s excitation time range, known as the Kautsky curve, is shown to be associated with a substantial decrease of CET-powered proton efflux from the stroma into the chloroplast lumen through the ATPsynthase of the photosynthetic machinery." @default.
- W2001087663 created "2016-06-24" @default.
- W2001087663 creator A5080594744 @default.
- W2001087663 date "2011-02-01" @default.
- W2001087663 modified "2023-09-30" @default.
- W2001087663 title "Kinetic analyses and mathematical modeling of primary photochemical and photoelectrochemical processes in plant photosystems" @default.
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- W2001087663 doi "https://doi.org/10.1016/j.biosystems.2010.10.016" @default.
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