Effects of Ligand-receptor geometry and stoichiometry on protein-induced aggregation of biotin-modified colloidal gold

Article Abstract:

The effects of ligand-receptor geometry and stoichiometry on protein-induced aggregation of biotin-modified colloidal gold nanoparticles after the addition of streptavidin is studied using a model, which is developed, by the combination of the classical Smoluchowski model of aggregation and the model of linker induced aggregation. The extra parameters that must be considered while dealing with aggregation of incompressible particles with fixed binding sights is highlighted by the results.

Ligands, Ligands (Chemistry), Biotin

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Diffusion of gold clusters on defective graphite surfaces

Article Abstract:

The diffusion characteristics of gold clusters on two types of defective graphite surfaces, one with a one-layer deep hole and the other with a one-layer high step edge, are studied with the use of molecular dynamics simulations. It is found that the hole defect acts as a repulsive barrier to the diffusing clusters, resulting in an excluded zone around the hole with a radius close to the sum of the cluster and hole radii.

Diffusion bonding (Metals)

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DFT study of cysteine adsorption on Au(111)

Article Abstract:

The adsorption of cysteine amino acid (H-SC(sub beta)H2-C(sub alpha)H-Nh2-COOH) on the (111) surface of gold is studied by means of periodic density functional calculations. The results for different adsorption sites and molecular configuration show that the chemisorption involving S(thiolate)-Au bonds on Au(111) is favored by starting with either cysteine or cystine gas-phase molecular precursors.

Adsorption, Cysteine

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