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(A) The characteristic time of the noise produced by the stepwise transients, τ, obtained by fitting Eq. 1 to noise spectra, depends on the bathing solution pH. At pH ∼ 5.3 it is close to 4 ms. Changing pH from 5.3 to 2.5 causes more than fourfold decrease in the characteristic time. (B) The frequency of the transients (number of events per second) increases with proton concentration. Bathing solution was 1 M KCl. Applied voltage was 100 mV.
