Abstract
The action of a psychotomimetic agent, N-methyl-3-piperidyl glycolate (NPB), was investigated on the surface pressure and surface viscosity of interfacial monolayers of stearic acid. A comparison was made between the action of calcium and NPB on the physicochemical properties of surface films. Both calcium and NPB interact with the film to promote condensation and increase surface viscosity. There is a close similarity in the pressure-area curves and the viscosity changes obtained with both calcium and NPB that suggests a similarity in their mode of interaction with the film. It is proposed that NPB can interact with two adjacent stearic acid molecules by virtue of electrostatic, hydrogen bond, and van der Waals forces. NPB can also interact with surface films in a manner which is different from calcium, and so impart additional effects to the film. The findings are discussed in terms of their possible significance to an understanding of the role of calcium in the bioelectric membrane.
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