N,N?-linked oligoureas are a class of enantiopure, sequence-defined peptidomimetic oligomers without amino acids that form well-defined and predictable helical structures akin to the peptide ?-helix. Oligourea-based foldamers combine number features—such as synthetic accessibility, sequence modularity, folding fidelity—that bode well for their use in range applications from medicinal chemistry ...

background: hemodialysis is a process of removing waste and excess fluid from blood when kidneys cannot function efficiently. it often involves diverting blood to the filter of the dialysis machin to be cleared of toxic substances. fouling of pores in dialysis membrane caused by adhesion of plasma protein and other toxins will reduce the efficacy of the filtre. objective: in this study, the inf...

ba ckground: there have been a number of reports indicating that garlic can inhibit helicobacter pylori ( h. pylori ) in vitro ; however, there is few clinical trials evaluating its effect in human infection. the aim of this study was to assess the effect of garlic consumption on urea breath test (ubt) results in patients with h. pylori infection. m ethods: we performed a randomized case-contro...

one pot solvent less synthesis of amidoalkylnaphthol derivatives via reaction of aldehydes, 2-naphthol and acetamide/urea in the presence of phenylphosphinic acid is  described. this methodology provides a simple synthetic route to amidoalkylnaphthols in good to high yields.

according to the unique properties and many applications of nano gold powder, it was prepared from an acid leaching tail solution. the low value residual gold ions existed in acid leaching tail solution in mouteh gold mine in iran with fellow heavy metals as pollutants (fe2+, cu2+, and zn2+). preparation of nano gold particles is achieved by two steps: first, by addition of ammonia as separatio...