Abstract
A mathematical treatment is given for 1/f noise observed in the ion transport through membranes. It is shown that this noise can be generated by current or voltage fluctuations which occur after step changes of the membrane permeability. Due to diffusion polarization in the unstirred solution layers near the membrane these fluctuations exhibit a 1/√t time course which produces noise with a 1/f frequency dependence. The spectral density of 1/f noise is calculated for porous membranes with random switches between a finite and zero pore permeability. A wide frequency range and a magnitude of 1/f noise are obtained which are compatible with experimental data of 1/f noise reported for nerve membranes.
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Supported by Deutsche Forschungsgemeinschaft, Sonderforschungsbereich 38 „Membranforschung“.
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Neumcke, B. 1/f Membrane noise generated by diffusion processes in unstirred solution layers. Biophys. Struct. Mechanism 1, 295–309 (1975). https://doi.org/10.1007/BF00537643
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DOI: https://doi.org/10.1007/BF00537643