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CdS nanoparticles have been synthesized by chemical co-precipitation method using PVA as a capping agent. Structural characterization of the as synthesized CdS nanoparticles were performed by X-ray diffraction (XRD) study which showed hexagonal structure with average crystallite size of 11 nm and lattice constants a=4.106 Å, c=6.637 Å. Optical characterization of nanocrystalline thin films prepared by Vacuum Evaporation Method from the synthesized powder were done by Photoluminescence spectroscopy and UVVisible absorption spectroscopy. UV-Visible absorption spectrum showed blue shift in absorption edge with respect to bulk CdS. The photoluminescence spectrum of the CdS film exhibited green emission band with a maximum at 528 nm. Radius of the synthesized CdS nanoparticle has been evaluated from the absorption spectrum by using the effective mass approximation formula. [ABSTRACT FROM AUTHOR]

Elemental analysis of some selected medicinal plants of northeast India having anti-diabetic property was conducted using proton-induced X-ray emission (PIXE) technique. Plant samples were excited with a 2.4-MeV proton beam from a 3-MV Tandetron accelerator, and the spectral data were analyzed by using GUPIX, a software package for fitting PIXE spectra from layered specimens. The elements K, Ca, Mn, Fe, Ni, Cu, Zn, Rb, and Sr were identified and concentrations determined. No toxic heavy metals were found in the plants. The accuracy and precision of the technique were assured by analyzing standard reference materials. Results indicated that the analyzed medicinal plants could be considered potential sources for providing a reasonable amount of the required elements along with other food items to diabetes mellitus patients. [ABSTRACT FROM AUTHOR]