Biomedical subjects
Publications and source records attributed to Alexander Wei.
Weakly ferromagnetic cobalt nanoparticles can assemble spontaneously into nanosized "bracelets" when dispersed in organic solvents containing resorcinarenes as surfactants. Bracelet self-assembly occurs in solution and is directed by magnetic dipolar interactions, whereas nanoparticle rings with larger diameters are produced by evaporation-driven flow on wetted surfaces.
[reaction: see text] 4-Deoxypentenosides, which are readily derived from D-sugars, resemble glycals in structure and reactivity and can undergo stereoselective epoxidation and S(N)2 nucleophilic addition to produce L-sugars in pyranosidic form.
Introduction of a stereodefined methyl group at the C-6 position of N-acetylglucosamine mono- and disaccharides creates a strong and predictable orientational bias on the geminal C-6 hydroxyl in solution, as determined by (1)H-(1)H and (13)C-(1)H NMR coupling constants. The conformational directing effect is more pronounced in the disaccharides because of the greater steric demand imposed by the neighboring glycosidic unit.