Excitonic dynamics of Chlorophyll-a molecules in chitosan hydrogel scaffold.

Biomimetic photo harvesting architecture has been proposed as an alternative for existing solar conversion systems. This fact led us to the successful realization of non-coherent electron hopping [hopping rate 4.28 ns(-1)] through excitonically coupled Chlorophyll-a (Chl-a) molecules within chitosan hydrogel matrix via TCSPC (Time Correlated Single Photon Count) and fluorescence anisotropy measurements.

Study of the release mechanism of Terminalia chebula extract from nanoporous silica gel.

Sol/gel-derived silica gel was prepared at room temperature from tetraethyl orthosilicate precursor. The extracts of Terminalia chebula (Haritoki) were entrapped into the porous silica gel. Fourier transform infrared analysis revealed the proper adsorption of herbal values in the nanopores of the silica gel.

Simple solution phase synthesis of 3-D assembly of ZnO nanoneedles and its efficient field emission.

Three dimensional (3-D) assemblies of ZnO nanoneedles have been synthesized on silicon substrate by a unique chemical process. Each nanoneedle in the assemblies was hexagonal faceted having [001] growth direction and tip diameter approximately 20 nm. The growth of 3-D assemblies was governed by the initial nuclei formation, followed by their aggregation and subsequently nanoneedle formation from each nucleus.

Gastric schwannoma presenting as gastric polyp with gastrointestinal bleeding.

Benign neurogenic tumors of stomach are the commonest of all nonepithelial tumors of the stomach, but solitary gastric schwannomas are rare. We report a 58-year-old man with gastric schwannoma presenting as fundal polyp and upper gastrointestinal bleeding. Endoscopic polypectomy was done.