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Screening of membrane surface charges by divalent cations: an atomic representation

Screening of membrane surface charges by divalent cations: an atomic representation THEORY . describing An abstract some of the PHYSIOLOGICAL LITERATURE COIdiIlS INIIIIWOUS C?XZWl- ples of cation at the charged surfaces of both biological membranes and artificial lipid bilayers (10, 31, 41, 44). Past theoretical treatments of ionic (based on diffuse double-layer theory) have incorporated assumptions that are oversimplified at the chemical level into their sophisticated mathematical logic. As a result, no readily visualized, reasonably complete, mechanistic description has yet been formulated for the molecular events involved in the “’ process, that is, the process which the surface potential of a charged membrane interface is altered to the same extent all ions of the same valence. One fundamental question needs to be answered at an atomic level. What physical picture will explain how different ions (of the same valence) in solution can have virtually the same interaction (or ) energies with the membrane charge sites, despite very definite differences in the atomic radii and hydration energies of the ions? Furthermore, how do the energies compare and interrelate with the corresponding binding energies for the individual ions? This study provides a workable atomic model that answers the above questions for the case with the greatest biological 0363-6143/78/0000-0000$01.25 Copyright cation model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Cell Physiology The American Physiological Society

Screening of membrane surface charges by divalent cations: an atomic representation

J. S. D'Arrigo
AJP - Cell Physiology , Volume 235: C109 – Sep 1, 1978
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Publisher
The American Physiological Society
Copyright
Copyright © 1978 the American Physiological Society
ISSN
0363-6143
eISSN
1522-1563
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Abstract

THEORY . describing An abstract some of the PHYSIOLOGICAL LITERATURE COIdiIlS INIIIIWOUS C?XZWl- ples of cation at the charged surfaces of both biological membranes and artificial lipid bilayers (10, 31, 41, 44). Past theoretical treatments of ionic (based on diffuse double-layer theory) have incorporated assumptions that are oversimplified at the chemical level into their sophisticated mathematical logic. As a result, no readily visualized, reasonably complete, mechanistic description has yet been formulated for the molecular events involved in the “’ process, that is, the process which the surface potential of a charged membrane interface is altered to the same extent all ions of the same valence. One fundamental question needs to be answered at an atomic level. What physical picture will explain how different ions (of the same valence) in solution can have virtually the same interaction (or ) energies with the membrane charge sites, despite very definite differences in the atomic radii and hydration energies of the ions? Furthermore, how do the energies compare and interrelate with the corresponding binding energies for the individual ions? This study provides a workable atomic model that answers the above questions for the case with the greatest biological 0363-6143/78/0000-0000$01.25 Copyright cation model.

Journal

AJP - Cell Physiology – The American Physiological Society

Published: Sep 1, 1978

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