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- W2052721808 abstract "Abstract Variation of pH and potassium ion (K+) concentration in a medium bathing 48 h sterile, aeroponic dark‐grown sunflower (Helianthus annuus L.) seedling roots were simultaneously monitored using specific non‐combined high‐sensitivity electrodes for pH and K+. Net K+ influx rates for different K+ concentrations (0.25, 0.5, 1, 2 and 5 mM) lagged by ≈ 60 min with respect to the, hydrogen ion (H+) efflux, and showed the biphasic saturable kinetics (Epstein's Systems I and II) described by other authors. However, in our close to natural conditions (H+ extrusion and K+ uptake systems are operating simultaneously), the range of K+ concentrations at which each of the two K+ uptake systems operated was also dependent on the time that the H+ extrusion system was operating too, and hence on the ?pHin,out created. The K+ concentration in the medium had negligible effects on the net root H+ efflux rate: only 5 mM K+ slightly enhanced in = 14% the maximum H+ efflux rate. Valinomycin caused a sharp K+ efflux, foll..." @default.
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- W2052721808 date "1998-01-01" @default.
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- W2052721808 title "Net simultaneous hydrogen and potassium ion flux kinetics in sterile aeroponic sunflower seedling roots: Effects of potassium ion supply, valinomycin, and dicyclohexylcarbodiimide" @default.
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- W2052721808 doi "https://doi.org/10.1080/01904169809365387" @default.
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