Abstract
The fundamental units of excitability are membrane ionic channels. Excitation requires fast switches in membrane permeability, and these are effected by channels that are ion-selective and can be “gated” open and closed. A variety of experimental methods have contributed to establishing the present picture of discrete channels of molecular dimensions, each capable of carrying a rather high ion flux. In this chapter, we discuss an experimental method, membrane noise analysis, which allows one to estimate the ionic currents carried by individual channels. The reason gated ionic channels give rise to a special type of electrical noise is that channels can open and close at random under steadystate conditions. Because the ion flux through a single channel is relatively large, random channel transitions generate observable electrical current fluctuations. These characteristic current fluctuations, often called channel noise, can be distinguished from other types of electrical noise which may be generated in an excitable-cell preparation.
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© 1981 Plenum Press, New York
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Lecar, H., Sachs, F. (1981). Membrane Noise Analysis. In: Nelson, P.G., Lieberman, M. (eds) Excitable Cells in Tissue Culture. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3803-1_5
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DOI: https://doi.org/10.1007/978-1-4684-3803-1_5
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