... bilayers, and theirdependence on calcium. Therefore, the objectives of this study were to analyze (a) the effect of KL4on the physical properties of membranes, in the absence and presence of Ca2+, ... properties of KL4 -containing membranes Next, we used the nonperturbing technique of DSC tostudy the effect of KL4on the thermotropic properties of surfactant-like membranes (Fig. 2). In the absence ... compilation ê 2006 FEBS Physical properties and surface activity of surfactant-like membranes containing the cationic and hydrophobic peptide KL4Alejandra Sa´enz1,*, Olga Can˜adas1,*,...