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• W2040953237 endingPage "9025" @default.
• W2040953237 startingPage "9022" @default.
• W2040953237 abstract "The capacitance and dielectric loss factor were measured for a sample of purple membrane of Halobacterium halobium as a function of hydration level (0.017 to >0.2 g of water/g of membrane) and frequency (10 kHz to 10 MHz). The capacitance and the derived conductivity show explosive growth above a threshold hydration level, h c ≈ 0.0456. The conductivity shows a deuterium isotope effect, H/ 2 H = 1.38, in close agreement with expectation for a protonic process. The level h c is frequency independent and shows no deuterium isotope effect. These properties are analogous to those found for lysozyme in a related study. Protonic conduction for the purple membrane can be considered, as for lysozyme, within the framework of a percolation model. The critical exponent, t , which describes the conductivity of a percolative system near the threshold, has the value 1.23. This number is in close agreement with expectation from theory for a two-dimensional percolative process. The dielectric properties of the purple membrane are more complex than those of lysozyme, seen in the value of h c and in the frequency and hydration dependence of the loss factor. There appear to be preferred regions of proton conduction. The percolation model is based upon stochastic behavior of a system partially populated with conducting elements. This model suggests that ion transport in membranes and its control can be based on pathways formed of randomly connected conducting elements and that a fixed geometry (a proton wire) is not the only possible basis for a mechanism of conduction." @default.
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• W2040953237 date "1988-12-01" @default.
• W2040953237 modified "2023-09-27" @default.
• W2040953237 title "Two-dimensional protonic percolation on lightly hydrated purple membrane" @default.
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• W2040953237 doi "https://doi.org/10.1073/pnas.85.23.9022" @default.
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