Average single-channel conductance, G, of OmpW of C. crescentus in different salt solutions and radii, hydrated radii and limiting molar conductivity of the cations.

The membranes were formed from diphytanoyl phosphatidylcholine dissolved to 1% in n-decane. The aqueous solutions were used unbuffered and had a pH of 6 unless otherwise indicated. The applied voltage was 20 mV, and the temperature was 20°C. The average single-channel conductance, G (± SD), was calculated from at least 80 single events by averaging over all fluctuations or using a Gaussian distribution of the single-channel conductance (1 M KCl). The ionic radii of the ions were taken from literature sources [38–40]. The radii of the hydrated cations were calculated from the limiting conductivities using the Stokes equation and were taken from [37]. The data for the limiting conductivities of the different ions were taken from [41]. The fact that the hydrated ion radius (Stokes radius) is in some cases smaller than the crystal radius is a phenomenon that is known from the literature (see ref. [42]).Average single-channel conductance, G, of OmpW of C. crescentus in different salt solutions and radii, hydrated radii and limiting molar conductivity of the cations.