Protein adsorption and inactivation on surfaces. Influence of heterogeneities

Article Abstract:

The application of ellipsometry, total internal reflection fluorescence and circular dichroism in various interfacial models confirmed the presence of heterogeneity in protein adsorption processes. This variation led to conformational changes which could either hasten or limit the rate of absorption and subsequent reactions on the surface. Results implied that the formation of adsorption models incorporating realiable heterogeneity parameters could greatly improve the analysis of these systems.

Proteins

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Reconstruction of clean and adsorbate-covered metal surfaces

Article Abstract:

Surface lattice structures are not firmly rigid ones but are dynamic structures. These structures have the ability to change in response to changes in surface conditions. These dynamic changes include simple interlayer relaxation, interlayer reconstruction by displacement, reconstruction involving large scale atom transport, or a combination of all these. These dynamic surface modifications are related with the redistribution of surface electronic density for surfaces without adsorbed atoms.

Lattice dynamics, Metals, Metal surfaces

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High-resolution helium atom time-of-flight spectroscopy of low-frequency vibrations of adsorbates

Article Abstract:

Application of helium time-of-flight spectroscopy in analyzing the lowest energy thermally excited vibration of adsorbates on single crystals is described. Calculations using the measured energies give the entropy of adsorbates. These energies are useful in understanding the curvature of potential energy surface at the binding sites. The helium time-of-flight spectroscopy gives the quantitative microscopic measurement of adsorbate-adsorbate interaction.

Usage, Time-of-flight mass spectrometry, Surface energy

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