Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

Adhesion and biologic behavior of human periodontal fibroblast cells to resin ionomer Geristore: a comparative analysis.

Abstract: Aim The resin ionomer Geristore, originally designed for restorative procedures, has been used extensively in treating subgingival defects (such as root resorption and perforations) and as a retrofilling material. The purpose of this study was to evaluate the cell adhesion as well as in vitro biocompatibility of human periodontal fibroblast cells with resin ionomer Geristore in comparison with mineral trioxide aggregate (MTA) and glass ionomer cement (GIC). Material and method Adhesion, growth, and morphology of human periodontal fibroblasts over test materials were evaluated by scanning electron microscopy (SEM). Biocompatibility was assessed by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide salt (MTT) assay. Results Compared to glass coverslips, cells grew and spread qualitatively better over the surface of Geristore in comparison with the other test materials. In vitro interpretation indicates that Geristore is significantly less cytotoxic to human periodontal ligament cells. Results of statistical analysis revealed that material extracts had significant effect on cell proliferation at both 24 h (F = 547.62, P < 0.05) and at 48 h (F = 6048.18, P < 0.05). Conclusion Our study supports that Geristore has enhanced biologic behavior to human periodontal ligament cells and superior biocompatibility in comparison with MTA and GIC, so it can be suggested as a material of choice in root resorption, perforations, and root-end filling.

The study of optical properties of In2O3 and of mixed oxides In2O3−MoO3 system deposited by coevaporation

Abstract: A discussion of the optical properties of two systems of dielectric films i.e. In2O3 and of mixed oxides In2O3−MoO3 system is presented. Film thickness, substrate temperature, annealing and composition (in molar%) have a profound effect on the structure and optical properties of these films. The decrease in optical band gap with the increase in film thickness of In2O3 is interpreted in terms of incorporation of oxygen vacancies in the In2O3 lattice. The decrease in optical band gap with the increase in substrate temperature and annealing of In2O3 thin films is ascribed to the release of trapped electrons by thermal energy or by the outward diffusion of the oxygen-ion vacancies, which are quite mobile even at low temperature. For the mixed oxides In2O3−MoO3 system the results are found to be compatible with the reduction in the value of optical band gap of these materials as the molar fraction of MoO3 increases in the In2O3 thin films and is attributed to the incorporation of Mo(VI) ions in an In2O3lattice that causes the indium orbital to become a little less tightly bound. The decrease in optical band gap of mixed oxides In2O3−MoO3 system, with increasing film thickness is interpreted in terms of incorporation of oxygen vacancies in both In2O3 and MoO3 lattice which are also believed to be the source of conduction electrons in In2O3–MoO3 complex. The decrease in optical band gap with increasing substrate temperature and annealing of mixed oxides In2O3−MoO3 system is due to the increasing concentration of oxygen vacancies, formation of indium and molybdenum species of lower oxidation state and indium interstitials. The blue colouration of mixed oxides In2O3–MoO3 samples is due to the inter-electron transfer from oxygen 2p to molybdenum 4d level due to which Mo species of lower oxidation states are formed.

A comparative study of thermodynamic properties of structurally related phenothiazine drugs in aqueous solution

Abstract: Association characteristics of amphiphilic phenothiazine drugs Fluphenazine and Trifluperazine dihydrochloride in water have been examined and their thermodynamic parameters have been calculated using conductometry. The electrical conductivity was measured as a function of concentration at various temperatures and cmc was calculated in the temperature range of 20-50C. Thermodynamic parameters i.e. standard free energy of micellization,mG , standard enthalpy of micellization, m H and standard entropy of micellization, m S were calculated from cmc value using closed association model.