The Rate Constants of Valinomycin-Mediated Ion Transport through Thin Lipid Membranes

The Effect of Valinomycin on the Ionic Permeability of Thin Lipid Membranes

Optically black membranes prepared from sheep red cell lipids have a high electrical resistance (1-3 x 10(8) ohm-cm(2)). The ionic transference numbers (T(i)) for cations (Na(+) or K(+)) are equal to each other but at least four to five times greater than for Cl(-). The cyclic depsipeptide valinomycin produces a striking decrease in the membrane resistance when K(+), but not when Na(+) is in th...

Boronic acid mediated ion transport through bilayer membranes

The Effect of Valinomycin on the Ionic Permeability of Thin Lipid Membranes

A B S T R A (3 T Optically black membranes prepared from sheep red ceU lipids have a high electrical resistance (1-3 X 10 s ohm-cm2). The ionic transference numbers (Ti) for cations (Na + or K +) are equal to each other but at least four to five times greater than for C1-. The cyclic depsipeptide valinomycin produces a striking decrease in the membrane resistance when K+, but not when Na + is i...

Ion transport mediated by the valinomycin analogue cyclo(L-Lac-L-Val-D- Pro-D-Val)3 in lipid bilayer membranes

Cyclo(L-Lac-L-Val-D-Pro-D-Val)3 (PV-Lac) a structural analogue of the ion-carrier valinomycin, increases the cation permeability of lipid bilayer membranes by forming a 1:1 ion-carrier complex. The selectively sequence for PV-Lac is identical to that of valinomycin; i.e., Rb+ greater than K+ greater than Cs+ greater than or equal to NH+4 greater than Na+ greater than Li+. The steady-state zero-...

Selective Mass Transport of CO2 Containing Mixtures through Zeolite Membranes

In this work, the main aspects regarding the permeation of mixtures containing CO2 and permanent gases such as H2 , N2 and CH4 through zeolite membranes have been investigated, focusing on the description of the mass transport mechanisms taking place inside the pores. First, a brief overview about the performance of the main zeolite membranes used in gas separation (e.g. DDR, CHA, AEI, FAU, etc...