The effect of an increase in the viscosity of the medium on cyclic photophosphorylation in chlo roplast thylakoids and the Ca 2+ dependent ATP hydrolysis by the chloroplast coupling factor CF 1 was stud ied. Using 0.1-0.2 mM ADP, it was found that the rate of ATP synthesis decreases after the addition of various agents that increase the viscosity of the medium (sucrose, dextran 40, or polyethylene glycol 6000) provided that these agents cause neither uncoupling nor electron transport inhibition in the absence of ADP. Dextran and polyethylene glycol inhibited ATP synthesis by 50% when their concentrations were much lower (6-10%) than that of sucrose (30-40%), while 50% inhibition of the Ca 2+ dependent ATP hydrolysis by CF 1 ATPase was observed at higher concentrations of dextran and polyethylene glycol (9-13%) and lower con centrations of sucrose (about 20%). For ADP, the effective Michaelis constant (K M ) was shown to increase by factors of 2-3 with increasing viscosity, while the maximum rate of cyclic photophosphorylation remained virtually unchanged. The dependence of K M on the medium viscosity can serve as a criterion for the operation of diffusion controlled photophosphorylation. Possible mechanisms of the diffusion of ADP and ATP are discussed.
Рассмотрены некоторые проблемы совместной интерпретации данных GPS и спутниковой радарной интерферометрии на примере землетрясения Горха в Непале 25.04.2015. Для анализа выбраны парные интерферограммы, полученные по снимкам спутника ALOS-2 ScanSAR, геометрия поверхности косейсмического разрыва построена по геофизическим и геологиче
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