Physics – Biological Physics
Scientific paper
2010-04-07
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.
Bier Martin
Gallaher Jill
Heimburg Thomas
Wodzinska Katarzyna
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