Abstract
Ion current through individual pores in track-etched polyethyleneterephthalate filters can have the following properties which are shared by a number of biological ion channels: 1. 1) selectivity for cations over anions, or vice versa depending on the surface charge of the filter and the diameter of the pore; 2. 2) fluctuations between high- and low-conductance states; 3. 3) inhibition by protons and divalent cations with efficacy H + > Zn 2+ > Ca 2+ ∼ Mg 2+. Pore topography in differing states can be imaged by scanning probe microscopy. We conclude that track-etched filters provide a useful model system for studying the physical and chemical basis for some of the characteristic behaviour of biological channels.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
