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2 Cellular and Molecular Biology Letters

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Planar, cylindrical and spherical electrical double layers in biological systems. The effect of counterion size

100%

Bohinc K. , Iglic A. , Slivnik T. , Kralj-Iglic V.

Cellular and Molecular Biology Letters

2002

tom 07

nr 3

The effect of counterion size on the electrical properties of an electrolyte solution in contact with charged planar, cylindrical and spherical surfaces is considered. Electrostatic interaction is considered by means of the mean electrostatic field, while the finite size of particles constituting the electrolyte solution is considered via the excluded volume effect within the lattice statistics. Different sizes of counterion are described by different values of the lattice constant. It is shown that the excluded volume effect considerably decreases the calculated number density of counterions near the charged surface. This effect is more pronounced in cylindrical geometry than in spherical geometry, and less pronounced than in planar geometry.

Shape variation of bilayer membrane daughter vesicles induced by anisotropic membrane inclusions

63%

Bohinc K. , Lombardo D. , Kralj-Iglic V. , Fosnaric M. , May S. , Pernus F. , Hagerstrand H. , Iglic A.

tom 11

nr 1

A theoretical model of a two-component bilayer membrane was used in order to describe the influence of anisotropic membrane inclusions on shapes of membrane daughter micro and nano vesicles. It was shown that for weakly anisotropic inclusions the stable vesicle shapes are only slightly out-of-round. In contrast, for strongly anisotropic inclusions the stable vesicle shapes may significantly differ from spheres, i.e. they have a flattened oblate shape at small numbers of inclusions in the membrane, and an elongated cigar-like prolate shape at high numbers of inclusions in the vesicle membrane.