Role of the Coulombic interaction in ligand-induced biopolymer aggregation

Article Abstract:

Aqueous solutions of a polynucleotide, polyadenylic acid (PolyA), which imitates the helix arrangement of RNA or single-stranded DNA but has a simpler structure, are used as a model system to investigate the role of the electrostatic interactions in the binding process between some platinum(II) complexes and PolyA and in the aggregation among PolyA molecules. The findings indicate that the presence of large, planar aromatic moiety in the dicationic platinum(II) complexes is essential for the binding with PolyA.

Ligand binding (Biochemistry), Biopolymers, Optical properties, Light scattering, Electrostatic interactions, Structure, Coulomb potential

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Models of adsorption at a line of three-phase contact

Article Abstract:

An analysis of two model density distributions at a line of three-phase contact, for which the adsorptions are readily calculated, is presented. A form of the line analogue of the Gibbs adsorption equation is conjectured, and it is observed that the conjecture is in principle testable by computer simulation and by experiment.

Thermal properties, Adsorption, Thermodynamics, Gibbs' equation

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