| Nernst e. |
an equation for the voltage produced by an electrochemical reaction: E = E° - RTzF ln Q , where E is the voltage produced, E° is the standard reduction potential for the reaction, R is the gas constant, T the absolute temperature, z the number of electrons transferred in the reaction, F Faraday's constant, Q the reaction quotient (q.v.), and ln the natural logarithm. The same formula gives the membrane potential produced by a concentration of a diffusible ion across a membrane; in this case E° is zero, z is the ionic charge, and Q is the ratio of the concentrations on the two sides of the membrane.
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| Nernst equation, potential |
see under equation and potential.
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| Nernst p. |
the voltage produced across a membrane by a concentration gradient of an ion that can diffuse through pores in the membrane while oppositely charged ions cannot pass through the membrane; see Nernst equation under equation.
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| Nernst's l. |
the current required to stimulate muscle action varies as the square root of its frequency.
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