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Phys. Rev. Lett. 89, 158101 (2002) [4 pages]

Origin of 1/fα Noise in Membrane Channel Currents

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Z. Siwy1,2 and A. Fuliński3
1Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland
2Gesellschaft für Schwerionenforschung (GSI), Planckstrasse 1, D-64291 Darmstadt, Germany
3M. Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30-059 Kraków, Poland

Received 4 April 2002; published 20 September 2002

The transport characteristics of nanofabricated synthetic pores of similar dimensions to those of biological channels is reported. By comparison of the ion current through single synthetic and biological channels we show that the 1/fα noise indeed originates from the channel’s opening-closing process. Strong evidence has been provided that the latter is related to the underlying motions of channel wall constituents.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.158101
DOI:
10.1103/PhysRevLett.89.158101
PACS:
87.16.Uv, 05.40.–a, 72.70.+m, 81.16.–c
 
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