TITLE Cerebellum Golgi Cell Model COMMENT Calcium first order kinetics Author: A. Fontana Revised: 12.12.98 ENDCOMMENT NEURON { SUFFIX Golgi_CALC_ca2 USEION ca2 READ ica2, ca2o WRITE ca2i VALENCE 2 RANGE d, beta, ca2i0, ca2_pump_i } UNITS { (mV) = (millivolt) (mA) = (milliamp) (um) = (micron) (molar) = (1/liter) (mM) = (millimolar) F = (faraday) (coulomb) } PARAMETER { ica2 (mA/cm2) celsius (degC) d = .2 (um) ca2o (mM) ca2i0 (mM) beta = 1.3 (/ms) } ASSIGNED { ca2_pump_i (mA) } STATE { ca2i (mM) } INITIAL { ca2i = ca2i0 } BREAKPOINT { SOLVE conc METHOD derivimplicit } DERIVATIVE conc { : outward ionic current with valence 2+ ca2_pump_i = 2*beta*(ca2i-ca2i0) : total outward Ca2 current ca2i' = -ica2/(2*F*d)*(1e4) - beta*(ca2i-ca2i0) }