after imposition of a potassium gradient across the epithelium by replacement of the mucosal solution by k+ ringer 's ( containing 50 microm amiloride ) , a lorentzian component appeared with an average corner frequency , fc = 15.6 +/- 0.91 hz and a mean plateau value so = ( 7.04 +/- 2.94 ) x 10 ( -20 ) a2 sec/cm2 .
C0032821
potassium
C0002502
amiloride