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## #76 Goldman & Nernst Equations

open
Nick Juty
5
2011-06-23
2011-04-27
Lukas Endler
No

Esteemed curators of the mighty SBO,
These terms might go under SBO:0000391 steady state expression.
Goldman equation:
synonyms: Goldman-Hodgkin-Katz voltage equation, Constant field equation
An expression for estimating the electrical potential across a semipermeable membrane under consideration of the concentration of all ions and their permeabilities.
http://en.wikipedia.org/wiki/Goldman_equation
Nernst equation:
Synonyms:
An expression to calculate the electrical redox potential of a redox reaction in a half cells in dependence on the concentrations of the reactants.
http://en.wikipedia.org/wiki/Nernst_equation
E_red = E0_red -R*T/(n*F)*ln Q
under SBO:0000308 - equilibrium or steady-state characteristic or under voltage?
E_red: electrical redox potential
E0_cell: standard reduction potential
n: number of electrons
Q: mass action ratio or reaction quotient http://en.wikipedia.org/wiki/Reaction_quotient wikipedia distinguishes between those two :(
Nernst equation (ionic transport): (child of general nernst)
An expression to calculate the equilibirum electrical potential of an ion across a permeable membrane at given concentrations on both sides of the membrane. It can be used to calculate the reversal potential of an ion.
V_m = -R*T/(z*F)*ln [A_in]/[A_out]
Also we could use the quantitative parameters:
(under Voltage and/or better SBO:0000308 )reversal potential, resting potential
somewhere under the rainbow:
charge of an entity,
All the best
Lukas

## Discussion

• Nick Juty
2011-06-23

• assigned_to: nobody --> njuty