Ion-channel-like behavior in lipid bilayer membranes at the melting transition

Details Ion-channel-like behavior in lipid bilayer membranes at the melting transition Ion-channel-like behavior in lipid bilayer membranes at the melting transition

2010-04-07

arxiv.org/abs/1004.1126v1

Phys. Rev. E 81, 061925 (2010)

Physics

Biological Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevE.81.061925

It is well known that at the gel-liquid phase transition temperature a lipid bilayer membrane exhibits an increased ion permeability. We analyze the quantized currents in which the increased permeability presents itself. The open time histogram shows a "-3/2" power law which implies an open-closed transition rate that decreases like $k(t) \propto t^{-1}$ as time evolves. We propose a "pore freezing" model to explain the observations. We discuss how this model also leads to the $1/f^{\alpha}$ noise that is commonly observed in currents across biological and artificial membranes.

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