Plot of log|Z| (solid circles) and φ (solid triangles) against logf (Bode plot) for a mercury-supported DPTL/DPhyPC bilayer incorporating gramicidin from its 1 × 10−7 M solution in aqueous 0.1 M KCl at −0.60 V vs. Ag|AgCl|0.1M KCl. The blue and red curves are the best fit of the equivalent circuit shown in the figure to the impedance spectrum, with Cs = 9 μF cm−2, Rs = 0.45 MΩ cm2, Cm = 0.65 μF cm−2, Rm = 2.5 kΩ cm2, CΩ = 0.05 μF cm−2 and RΩ =3.2 Ω cm2. The parameters at the same tBLM in the absence of gramicidin are: Cs = 5 μF cm−2, Rs = 0.60 MΩ cm2, Cm = 0.85 μF cm−2, Rm = 4.5 MΩ cm2, CΩ = 0.05 μF cm−2 and RΩ = 3.2 Ω cm2.