No abstract

No abstract

By employing separable potentials for the binary, i.e., n-n and n-core subsystems, we compute the threebody integral equations to solve for the 2n-separation energies in the ground and excited states of halo nuclei like 19 B, 22 C, and 20 C. We show through numerical analysis and also from analytical considerations that Borromean-type halo nuclei like 19 B and 22 C, where n-n and n-core are both unbound, are much less vulnerable to respond to the existence of the Efimov effect. On the contrary, those nuclei, like 20 C in which the halo neutron is supposed to be in the intruder low lying bound state with the core, appear to be the promising candidates to search for the occurrence of Efimov states at energies below the n-(nc) breakup threshold which can be within the experimental limits to measure.

A one-pot synthesis of various symmetrical and unsymmetrical 2-pyridyl-, 2-bromo-5-pyridyl-, and 2,5-dibromo-3-pyridyltellurium compounds has been carried out, at room temperature, by selective single bromine-magnesium exchange of 2-bromo-, 2,5-dibromo-and 2,3,5-tribromopyridine, respectively, with isopropylmagnesium chloride. This exchange reaction gives the corresponding pyridylmagnesium chlorides, which, upon insertion of elemental tellurium (activated), give the pyridyltelluromagnesium chlorides, and,

No abstract

No abstract

Self-assembled peptide-based nanostructures have been the focus of research in the past decade because of their potential applications in various biological systems. Normally, small self-assembled peptide nanostructures contain hydrophobic moieties, therefore, their solubility in aqueous systems poses the important challenge in the field of molecular self-assembly in order to make effective use of these in a wide variety of applications. To improve their aqueous solubility, the self-assembled amphiphilic α,β-dehydrophenylalanine containing small glyco-dehydropeptides, Boc-Phe-ΔPhe-εAhx-GA (I) and H-Phe-ΔPhe-εAhx-GA (II) with glucosamine (GA) attached at the C-terminal through a 6-aminocaproic acid linker, were synthesized, demonstrating the formation of nanostructures in aqueous media, which were characterized by DLS, AFM and TEM. Further, nanostructure II reduced auric chloride to gold nanoparticles and formed a peptide-gold conjugate (VII). The feasibility of using the nanostructures I and II as nanovectors for drug delivery was demonstrated by loading hydrophobic molecules, eosin and N-fluoresceinyl-2-aminoethanol (FAE) dyes. Besides, these peptides displayed antimicrobial activity against Micrococcus flavus, Bacillus subtilis and Pseudomonas aeruginosa. All these results advocate the potential of these nanostructures as efficient vectors for drug delivery applications.

No abstract