Figure 3. Power density spectra of HA1383 induced current noise of ∼450 PA₆₃-channels (added to the cis-side).

Trace 1 shows the control (PA₆₃ without substrate). Trace 2–4: The aqueous phase contained 0.1, 6.3 and 24.9 µM HA1383, respectively and the power density spectrum of trace 1 was subtracted. Membrane was formed from diphytanoyl phosphatidylcholine/n-decane. The aqueous phase contained 150 mM KCl, 10 mM MES, pH 6.0, and about 1 ng/ml PA₆₃ on the cis-side; V_m = 20 mV; T = 20°C.