Energy of interaction between solid surfaces and liquids

Article Abstract:

Research was conducted to examine the energy of interaction between solid surfaces and liquids. A mean-field theory was used to investigate how the surface energy is related to molecular interaction. A more precise representation of the surface energy that takes into consideration not only the value of density rho(sub s) but also the contribution from the whole density profile of the fluid is proposed. Results indicate that the method may be extended to the case of nonflat solid surfaces which is important in catalysis chemistry.

Solid-liquid equilibrium, Surfaces (Physics)

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Theory of the linear dichroism in the extended X-ray absorption fine structure (EXAFS) of partially vectorially ordered systems

Article Abstract:

Research was conducted to examine the theory of the linear dichroism in the extended X-ray absorption fine structure (EXAFS) of partialy vectorially ordered systems. A data-evaluation approach is presented that involves a joint-fit of EXAFS spectra calculated for, at least, two excitation angles. Results suggest that the method accounts correctly for partial disorder and it permits an exact single-scattering, curved-wave treatment of the EXAFS originating from an absorber-backscatterer pair of unknown orientation.

Extended X-ray absorption fine structure, Linear topological spaces

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Imaging the molecular dimensions and oligomerization of proteins at liquid/solid interfaces

Article Abstract:

The imaging of individual Concanavalin A molecules at the liquid/solid interface using an atomic force microscope was described. Three-dimensional sizing with significantly high resolution was obtained by a novel technique based on height distributions. This approach avoids the tip convolution effects which normally affect scanning probe microscopy. The complete height distribution takes into consideration the three-dimensional size of the protein sample as well as its tertiary and quaternary structure.

Usage, Proteins, Molecular structure, Protein structure, Atomic force microscopy

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