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Biophysical Journal 10: 664-674 (1970)
© 1970 the Biophysical Society

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Temperature-Dependent van der Waals Forces

V. A. Parsegian and B. W. Ninham

ABSTRACT

Biological systems can experience a strong van der Waals interaction involving electromagnetic fluctuations at the low frequency limit. In lipid-water mixtures the free energy of this interaction is proportional to temperature, primarily involves an entropy change, and has qualitative features of a "hydrophobic bond." Protein-protein attraction in dilute solution is due as much to low frequency proton fluctuation (Kirkwood-Shumaker forces) and permanent dipole forces as to high frequency (infrared and UV) van der Waals intreactions. These conclusions are described in terms of numerical calculations via the Lifshitz theory of van der Waals forces.






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Copyright © 1970 by the Biophysical Society.