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# NPP expression
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In the model of Mauritz() the time dependent permeability due to NPPs was described by:
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P = P_max * (1 + exp[(t_12 - t) / s])^-1
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where P_max is the maximal permeability for an ion, t_12 is the timw of half-maximal permeability and s is the steepness of the permeability change.
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Here we use this function to describe the expression of NPPs.
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We describe it with the time derivative as we use ODEs:
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dNPP/dt = NPP_max * exp((t_12 - t) / s) / (s * (1 + exp((t_12 - t) / s))**2) |
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\ No newline at end of file |
