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50 lines
751 B
50 lines
751 B
: Ca diffusion in a Purkinje cell |
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: Created 8/15/02 - nwg |
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NEURON { |
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SUFFIX cadiff |
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USEION ca READ ica, cai WRITE cai |
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RANGE ca |
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GLOBAL depth, beta |
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} |
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UNITS { |
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(mV) = (millivolt) |
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(mA) = (milliamp) |
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(mM) = (milli/liter) |
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(um) = (micron) |
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} |
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CONSTANT { |
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F = 9.6485e4 (coul) |
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} |
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PARAMETER { |
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cai (mM) |
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dt (ms) |
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depth = 0.1 (um) |
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beta = 1 (/ms) |
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} |
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ASSIGNED { |
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ica (mA/cm2) |
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} |
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STATE { |
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ca (mM) |
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} |
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INITIAL { |
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ca = 0.0001 |
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} |
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BREAKPOINT { |
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ca = ca + (10000.0) * dt * ( ( -1/(2*F)*ica / (depth)) - (0.0001) * beta * ca ) |
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if ( ca < 1e-4 ) {: minimum 100 nM Ca |
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ca = 1e-4 |
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} |
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cai = ca |
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}
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