Current Noise Generated in Lipid Bilayer Membranes by Carrier‐Mediated Ion Transport

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Abstract
Valinomycin‐mediated ion transport generates in lipid bilayer membranes a characteristic type of current noise spectrum completely different from noise spectra in the presence of pore‐forming substances like gramicidin, alamethicin or monazomycin.At equilibrium the current noise of the carrier system yields to a spectral intensity “white” (frequency independent) both at the low and high frequency end of the spectrum. Between the low and high frequency range of the spectrum the spectral intensity increases with frequency. The frequency range of transition is correlated to the characteristic relaxation time constants of this transport system. The experimental behaviour of the spectral intensity can be theoretically described on the basis of the Nyquist theorem applied for the carrier transport model.

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