Pretransitional Effects in Dimyristoylphosphatidylcholine Vesicle Membranes: Optical Dynamometry Study

Pretransitional effects in dimyristoylphosphatidylcholine vesicle membranes: optical dynamometry study.

We used micron-sized latex spheres to probe the phase state and the viscoelastic properties of dimyristoylphosphatidylcholine (DMPC) bilayers as a function of temperature. One or two particles were manipulated and stuck to a DMPC giant vesicle by means of an optical trap. Above the fluid-gel main transition temperature, T(m) congruent with 23.4 degrees C, the particles could move on the surface...

Electric Field Effects on the Pretransitional Optical Activity of CB15

The influence of applied electric fields on the pretransitional optical activity Ii) in the chiral nematic 4-cyano-4-(2-methyl)butylphenyl (CB15) was investigated. A rotating analyzer system was used to measure the optical activity and fields

Pretransitional Effects in the Rayleigh-benard Instability

Adhesion of multicomponent vesicle membranes.

In this work, we study the adhesion of multicomponent vesicle membrane to both flat and curved substrates, based on the conventional Helfrich bending energy for multicomponent vesicles and adhesion potentials of different forms. A phase field formulation is used to describe the different components of the vesicle. For the axisymmetric case, a number of representative equilibrium vesicle shapes ...

Studies by Trypsin Digestion in Vesicle Membranes

Purified adrenocortical microsomal P-450~21 was incorporated into vesicle membranes composed of phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine a t a molar ratio of 5 3 : 1. Trypsinolysis of the incorporated P 4 5 0 ~ ~ ~ resulted in the formation of 30-, 2 5 , and 20-kDa fragments. Similar fragment formation was observed by trypsinolysis of bovine adrenocortical microsome...