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

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; τ_m, membrane time constant; V_1/2, voltage for one-half activation of Porel; k, slope factor.