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Charge fluctuations and boundary conditions of biological ion channels: effect on the ionic transition rate

Research output: Contribution in Book/Report/ProceedingsChapter


Publication date2009
Host publicationNoise and Fluctuations : 20th International Conference on Noise and Fluctuations (ICNF-2009)
EditorsM. Macucci, G. Basso
Place of publicationMelville, N. Y.
PublisherAmerican Institute of Physics
Number of pages4
Original languageEnglish

Publication series

NameAIP Conference Proceedings
PublisherAmerican Institute of Physics


A self-consistent solution is derived for the Poisson-Nernst-Planck (PNP) equation, valid both inside a biological ion channel and in the adjacent bulk fluid. An iterative procedure is used to match the two solutions together at the channel mouth. Charge fluctuations at the mouth are modeled as shot noise flipping the height of the potential barrier at the selectivity site. The resultant estimates of the conductivity of the ion channel are in good agreement with Gramicidin experimental measurements and they reproduce the observed current saturation with increasing concentration.

Bibliographic note

Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in AIP Conference Proceedings, 1129 (535), 2009 and may be found at http://link.aip.org/link/?APCPCS/1129/535/1