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• W2063460473 abstract "The properties of low impedance charged synthetic membranes containing oriented bacteriorhodopsin have been described in previous studies from our laboratory. Two methods of preparation were used: field orientation and surface orientation. Photocurrents measured at short-circuit reached current densities as high as 20 μA/cm2. We have since studied the photovoltaie behavior of these membranes over the entire range from short-circuit to open-circuit. The voltage—current relationships are linear, and can be represented by an equivalent circuit consisting of a “light pathway” and a “dark pathway” in parallel. The dark pathway comprises a resistance in series with an asymmetry potential. The latter may be quite high, and decays only very slowly with time. In the presence of light, the parallel light pathway is “switched on”. This pathway has its own characteristic resistance in series with the photovoltaic electromotive force. The behavior of the components of the equivalent circuit as a function of ambient salt concentration is described. The photocurrent generated by the light pathway in the range 10−1—10−3M KCl is relatively independent of salt concentration. The photovoltage on the other hand reaches maximum values at low salt concentrations (∼10−3M KCl). These values are of the order of 50 mV, which is comparable to the values measured in proteoliposomes containing bacteriorhodopsin. In the case of surface-oriented membranes, the output power of the light pathway tends to a maximum of about 75μW/cm2 at the lowest salt levels. Since the intensity of absorbed illumination in these experiments is about 17 mW/cm2, the efficiency of energy conversion is of the order of 0.5%. In the case of field-oriented membranes a somewhat higher efficiency can be achieved." @default.
• W2063460473 created "2016-06-24" @default.
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• W2063460473 date "1983-01-01" @default.
• W2063460473 modified "2023-09-27" @default.
• W2063460473 title "Photovoltaic behavior of bacteriorhodopsin-loaded cation-exchange membranes" @default.
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• W2063460473 doi "https://doi.org/10.1016/s0376-7388(00)81323-x" @default.
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