Nernst equation
A basic equation of biophysics that describes the relationship between the equilibrium potential difference across a semipermeable membrane, and the equilibrium distribution of the ionic permeant species. It is described by: E = -(RT/zF).ln(C2/C1), where E is the potential on side 2 relative to side 1 (in volts), R is the gas constant (8.314 J K-1 mol-1 ), T is the absolute temperature, z is the charge on the permeant ion, F is the Faraday constant (96,500 C mol-1) and C1 and C2 are the concentrations (more correctly activities) of the ions on sides 1 and 2 of the membrane. It can be seen that this equation is a solution of the more general equation of electrochemical potential, for the special case of equilibrium. The equation described the voltage generated by ion-selective electrodes, like the laboratory pH electrode; and approximates the behaviour of the resting plasma membrane (see resting potential).

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • Nernst equation — nernst n an equation used to find the potential difference across a semipermeable membrane through which an ion diffuses between solutions where its concentration differs and that for a temperature of 37°C (98.6°F) gives a result in millivolts… …   Medical dictionary

  • Nernst equation — In electrochemistry, the Nernst equation is an equation that can be used (in conjunction with other information) to determine the equilibrium reduction potential of a half cell in an electrochemical cell. It can also be used to determine the… …   Wikipedia

  • Nernst equation — Nernsto lygtis statusas T sritis chemija apibrėžtis Apytikslė lygtis dujinių medžiagų reakcijos pusiausvyrai apskaičiuoti. atitikmenys: angl. Nernst equation rus. уравнение Нернста …   Chemijos terminų aiškinamasis žodynas

  • Nernst equation — Nernsto lygtis statusas T sritis chemija apibrėžtis Lygtis, reiškianti elektrodo potencialo priklausomybę nuo jonų aktyvumo tirpale. atitikmenys: angl. Nernst equation rus. уравнение Нернста …   Chemijos terminų aiškinamasis žodynas

  • Nernst equation — A relationship showing that the electromotive force developed by a dry cell is determined by the activities of the reacting species, the temperature of the reaction, and the standard free energy change of the overall reaction …   Dictionary of automotive terms

  • Nernst equation potential — (nernst) [Walther Hermann Nernst, German physical chemist, 1864–1941] see under equation and potential …   Medical dictionary

  • Nernst potential — can refer to: *Nernst equation *Reversal potential …   Wikipedia

  • Équation de Nernst (électrophysiologie) — Potentiel électrochimique de membrane Toute cellule est entourée d une membrane. Cette membrane, constituée d une bicouche lipidique phospholipidique et de protéines insérées, est relativement imperméable aux molecules polaires telles que l eau… …   Wikipédia en Français

  • Nernst, Walther Hermann — born June 25, 1864, Briesen, Prussia died Nov. 18, 1941, Muskau, Ger. German scientist, one of the founders of modern physical chemistry. He taught at the Universities of Göttingen and Berlin until forced to retire in 1933 by the Nazi regime.… …   Universalium

  • Nernst — Walther Hermann Nernst Walther Hermann Nernst Walther Hermann Nernst (25 juin 1864 18 novembre 1941) est un physicien et chimiste allemand. Il a mené de nombreuses recherches dans les domaines de l électrochimie, la thermodynamique, la chimie du… …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”