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Fig. 5. Doseresponse curves showing % inhibition of fluid secretion rate
(mean ± S.E.M., N=614)
versus bumetanide concentration for tubules bathed in control saline
(
) and K+-free saline (
). Percentage inhibition was
calculated as 1(secretion rate of bumetanide-treated tubule/mean
secretion rate of control tubules)x100. Data were calculated using the
t=55 min values in Fig.
4 and were fit to the MichaelisMenten equation using
non-linear regression analysis, giving r2 values for the
control and K+-free data of 0.94 and 0.98, respectively.