Binding effects in multivalent Gibbs-Donnan equilibrium

Details Binding effects in multivalent Gibbs-Donnan equilibrium Binding effects in multivalent Gibbs-Donnan equilibrium

2005-12-19

arxiv.org/abs/physics/0512164v1

Europhysics Letters 73 (06/01/2006) 635-641

Physics

Biological Physics

Scientific paper

10.1209/epl/i2005-10425-3

The classical Gibbs-Donnan equilibrium describes excess osmotic pressure associated with confined colloidal charges embedded in an electrolyte solution. In this work, we extend this approach to describe the influence of multivalent ion binding on the equilibrium force acting on a charged rod translocating between two compartments, thereby mimicking ionic effects on force balance during in vitro DNA ejection from bacteriophage. The subtle interplay between Gibbs-Donnan equilibrium and adsorption equilibrium leads to a non-monotonic variation of the ejection force as multivalent salt concentration is increased, in qualitative agreement with experimental observations.

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