Healing promoting potentials of roots of Ficus benghalensis L.in albino rats

Objective:To screen the wound healing activity of aqueous and ethanolic extract of roots of Ficus benghalensis.Methods:Both the extracts were evaluated for wound healing by three models ie. incision,excision and dead space wound.In incision and dead space the extracts were applied ilaily topically till the 10th post wounding days while in excision model it was till the complete epithelialization process.Standard group were administered Povidone iodine ointment topically daily.The breaking strength,percentage of wound contraction,period of epithelialization,dry granulation weight and hydroxyproline content were observed.Results:The result of the present study showed that both extracts were able to increase the breaking strength(incision model), decrease period of epithelialization.increase percentage wound contraction(excision model), increase hydroxyproline content(Dead space wound model) significantly compared with control group(P【0.05).Conclusions:Based on result we conclude that aqueous extract is more effective than ethanolic extract.However,it is needed more research to be carried out especially on toxicity studies of ethanolic extract.

Enhancement of wound healing with roots of Ficus racemosa L.in albino rats

Objective:To establish the wound healing activity of aqueous and ethanolic extract of roots of Ficus racemosa(F.racemosa).Methods:Two models were performed to evaluate the wound healing activity Le.incision and excision models.In incision model the purameler which was carried out was breaking strength of wounded skin.In excision model percentage wound contraction and period of epithelialization were established for both the extracts.Reference standard drug was povidone iodine ointment for comparison with other groups.Results:From the observation in both two models,aqueous extract of F.racemosa was found to have greater wound healing activity in terms of breaking strength in incision model and percentage wound contraction,period of epithelialization in excision model than that of other groups.Conclusions: In conclusion,our findings suggest that aqueous extract of F.racemosa possesses better wound healing ability than the ethanolic extract.

Electrical Studies on Pentacene Thin Film Transistors with Different Channel Widths

In order to conduct electrical studies on organic thin film transistors, top-contact devices are fabricated by growing polycrystalline films of freshly synthesized pentacene over Si/SiO2 substrates with two different channel widths under identical conditions. Reasonable field effect mobilities in order of 10^-2-10^-3 cm^2V^-1s^-1 are obtained in these devices. An elaborative electrical characterization of all the devices is undertaken to study the variance in output saturation current, field effect mobility, and leakage current with aging under ambient conditions. As compared to the devices with longer channel width, the devices with shorter channel width exhibit better electrical performance initially. However, the former devices sustain the moderate performance much longer than the latter ones.

Study of structural, electrical, and photoluminescent properties of SrCeO3 and Sr2CeO4

Phase pure powders of SrCeO3 and Sr2Ce O4 have been synthesized by calcination at 1000℃for 14 h via solid state ceramic route.Ceramics/pellets of these samples have been obtained by sintering at 1200℃for 12 h.The Rietveld refinement of X-ray diffraction(XRD)pattern of sintered powders confirmed orthorhombic structure of both the samples with space group Pnma and Pbam for SrCeO3 and Sr2CeO4,respectively.Scanning electron microscopic(SEM)studies indicated that both the compounds have dense microstructure,but morphology and size of the grains are different.The impedance spectroscopy technique has been employed to study the relaxation phenomenon.DC conductivity of the samples has been measured in the temperature range of 200–600℃to understand the conduction mechanism.The activation energy for relaxation(Erelax)and DC conduction(Econd)are found to be the same for both the compounds.Based on the numerical value of activation energies,relaxation and conduction mechanism in both the samples are attributed to migration of doubly ionized oxygen vacancies(Vo··).Photoluminescence technique has been employed to confirm the existence of oxygen vacancies.These studies have indicated that migration of oxygen vacancies in Sr2CeO4 is occurring mainly along a and c direction,i.e.,via perovskite cells.Further,the present work has clearly indicated that besides optical properties,electrical properties of Sr2CeO4 are also interesting and can be utilized for various applications such as oxide ion conduction electrolyte in solid oxide fuel cells(SOFCs).