Table I.

Parameters of linear properties and relative open probabilities

  Linear properties after 9-AC addition Porel 
 n Cm Rm Rs τm V1/2 k 
  pF mΩ kΩ µs mV mV 
Population studies       
Naive 20 463 ± 35 244 ± 31 574 ± 27 197 ± 6 −61.0 ± 1.7 20.5 ± 0.8 
Detubulated 18 316 ± 22 326 ± 52 500 ± 33 211 ± 10 −64.5 ± 2.8 22.8 ± 1.2 
Paired studies       
15–16 d 10 366 ± 20 248 ± 15 541 ± 30 193 ± 5   
4 mo 4 934 ± 40 137 ± 64 302 ± 77 306 ± 94   
  Linear properties after 9-AC addition Porel 
 n Cm Rm Rs τm V1/2 k 
  pF mΩ kΩ µs mV mV 
Population studies       
Naive 20 463 ± 35 244 ± 31 574 ± 27 197 ± 6 −61.0 ± 1.7 20.5 ± 0.8 
Detubulated 18 316 ± 22 326 ± 52 500 ± 33 211 ± 10 −64.5 ± 2.8 22.8 ± 1.2 
Paired studies       
15–16 d 10 366 ± 20 248 ± 15 541 ± 30 193 ± 5   
4 mo 4 934 ± 40 137 ± 64 302 ± 77 306 ± 94   

All linear properties in the paired studies were obtained after detubulation. n, number of fibers; Cm, cell capacitance; Rm, membrane resistance; Rs, uncompensated series resistance; τm, membrane time constant; V1/2, voltage for one-half activation of Porel; k, slope factor.

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