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Mariappan M.,Thiru Vi Ka Government Arts College | Madhurambal G.,A D M College For Women | Mojumdar S.C.,Trencin University Of bcek | Mojumdar S.C.,University of Guelph
Journal of Thermal Analysis and Calorimetry | Year: 2014

A new semi organic nonlinear optical (NLO) crystal, l-valine thiourea has been synthesized and good optical quality single crystals were grown by slow evaporation technique. The growth conditions of the crystals are studied and the grown crystals are confirmed by powder X-ray diffraction studies. The grown crystal was characterized using powdered XRD, FT-IR, UV-Vis-NIR, EDX, and TG-DTA. The crystalline nature and its various planes of reflections were observed by the powder XRD. The presence of various functional groups was confirmed by FT-IR spectra. The UV-Vis-NIR spectra indicate that the crystal has very good absorption in the entire visible and near IR region spectrum suggesting the suitability of the material for NLO applications. The decomposition temperatures and mass loss have been estimated from the thermogravimetric analysis. © 2014 Akadémiai Kiadó, Budapest, Hungary.

Thushimenan S.,Annamalai University | Baskaran J.,Thiru Vi Ka Government Arts College | Baranitharan M.,Annamalai University | Jeyasankar A.,Post Graduate & Research
Asian Journal of Pharmaceutical and Clinical Research | Year: 2016

Objective: The present study was investigated important medicinal plant extract Terminalia arjuna and Trachyspermum roxburghianum against the fourth instars larvae of groundnut pest Helicoverpa armigera. Methods: The extracts were used as methanol, ethyl acetate, chloroform, and hexane and are used as the different concentration of 25, 75, 125, 175, and 225 ppm level of antifeedant, larvicidal, and ovicidal activity of fourth instars larvae on H. armigera were maintained the laboratory condition. Results: It was noted that antifeedant activity of two important medicinal plants in the experiment of the methanol extract of T. arjuna was 99% at 225 ppm and T. roxburghianum methanol extract was 92% at 225 ppm, respectively. The high percent mortality present in the 225 ppm concentration of both plants are T. arjuna: 100, 98, 90, and 86 ppm and T. roxburghianum: 97, 92, 89, and 82 ppm, respectively. These processes maintained probit analysis, values are detecting and high mortality level of methanol extract T. arjuna with LC50 and LC90 values were 105.81 and 202.80 ppm; T. roxburghianum methanol extract of LC50 and LC90 values were 91.94 and 177.48 ppm, respectively. The maintained in the treatments based on the procedure followed the experiment of ovicidal activity of both plants. The eggs are no hatchability for methanol extract of T. arjuna were 91% at 225 ppm, respectively, and methanol extract of T. roxburghianum were 90% at 225 ppm, respectively. Conclusion: These results have been suggested that the T. arjuna and T. roxburghianum plant methanol extract used as the integral pest management studies of the groundnut pest, H. armigera. © 2016, Innovare Academics Sciences Pvt. Ltd. All rights reserved.

Sasikala S.L.,Manonmaniam Sundaranar University | Aldous V.H.J.,Thiru Vi Ka Government Arts College
Asian Pacific Journal of Tropical Medicine | Year: 2010

Objective: To isolate the multiple drug resistance (MDR) Mycobacterium tuberculosis (M. tuberculosis) and to screen for the bioactive compounds extracted from marine microalgae. Methods: Sixty seven collected samples that were confirmed by 16S rDNA analysis as positive with M. tuberculosis infection were subjected to sensitivity test against commercially used front line and second line drugs by absolute concentration method using LJ slants. Seven bacterial isolates numbered I-78, I-101, I-127, I-173, I-202, I-262, I-327 showed resistant for more than 3 drugs were considered as MDR M. tuberculosis. Thus the percentage of 10.4 were recorded MDRTB. Fifteen marine micro algal extracts were screened for antimycobacterial activity and partial characterization of the active principles was done. Results: The percentage contribution of marine micro algal species on the extraction of antimycobacterials indicated Isochrysis galbana (I. galbana) contain rich bioactive compounds and accounted for 60% inhibition of the total isolates. The percentage contribution of solvents on the extraction of antimicrobials from I. galbana showed that the methanol, chloroform, n-Butanol showed maximum of extraction. The purified eluted compounds (Rf 0.43) from TLC plate were chromatographed by gas chromatography. The eluted sterol compounds showed 13 unsaturated sterols with 3 major sterols. Conclusions: The present study indicates the presence of unsaturated fatty acids may have the effect on MDR M. tuberculosis, indicating a potential natural alternative to antibiotics. © 2010 Hainan Medical College.

Vijayakumaran V.,PRIST University | Arivoli S.,Thiru Vi Ka Government Arts College
Journal of Materials and Environmental Science | Year: 2012

Batch adsorption behavior of Malachite green(MG) from aqueous solution by using Odina Wodier bark carbon (OWC) was investigated as a function of parameters such as initial MG concentration, adsorbent dose, pH, contact time and temperature. The freundlich and langmuir adsorption models were applied to describe the equilibrium. The thermodynamic parameters such as ΔG0, ΔH0 and ΔS 0 were calculated to know the nature of adsorption, these values indicate that the adsorption process is favourable. The pseudo-first-order, pseudosecond-order, elovich and intraparticle diffusion models were used to describe the kinetic parameters. The high correlation coefficient (γ) was found in pseudo-second-order and intraparticle diffusion models.

Madhurambal G.,ADM College for Women | Mariappan M.,Thiru Vi Ka Government Arts College | Selvarajan G.,Thiru Vi Ka Government Arts College | Mojumdar S.C.,University of Trencin | Mojumdar S.C.,University of Guelph
Journal of Thermal Analysis and Calorimetry | Year: 2015

The induction period of various proportions of urea-thiourea mixed crystal (UTMC) in methanol and absolute alcohol has been measured experimentally by the visual observation method. It decreased from 0.1 to 0.5 UTMC and then slightly increased from 0.66 to 0.9 UTMC. The solubility of various proportions of UTMC was determined. It decreases with increase in proportions of thiourea. The induction period, which is inversely proportional to the nucleation rate, has been used to estimate the interfacial tension between the UTMC and methanol, absolute alcohol, hence the nucleation parameters like critical radius (r), number of molecules in the radius (r) and Gibbs free energy change for the formation of a critical nucleus (δG) have been calculated. The δGof UTMC in methanol was lower than absolute alcohol. The morphologies in all proportions of UTMC are completely changed. © 2015 Akadémiai Kiadó, Budapest, Hungary.

Porkalai V.,Thiru Vi Ka Government Arts College | Benny Anburaj D.,Thiru Vi Ka Government Arts College | Sathya B.,Thiru Vi Ka Government Arts College | Nedunchezhian G.,Thiru Vi Ka Government Arts College | Meenambika R.,Thiru Vi Ka Government Arts College
Journal of Materials Science: Materials in Electronics | Year: 2016

Nanoparticles of Zinc oxide (ZnO) are widely used in many fields serving as catalysts, wear resistance materials and advanced of applicable process. Pure and Indium-Silver co-doped ZnO nanoparticles are synthesized via Sol–gel method followed by calcinations at 400, 500 and 600 °C for 2 h. The influence of calcinations temperature on the particle size, the structural, morphological, Elemental composition, Chemical and optical properties were examined by X-ray diffraction, scanning electron microscope, energy dispersive X-ray absorption, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and UV–Vis absorption spectrum. The average particle size of the synthesized ZnO nanoparticles is calculated using the Scherrer formula and is found to be less than 20 nm. These results also indicate that there is an improvement in the crystalline of ZnO nanoparticles with the increase in the calcination temperature. © 2016 Springer Science+Business Media New York

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