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Mayiladuthurai, India

Rajkumar S.,Avc College | Jebanesan A.,Annamalai University
European Review for Medical and Pharmacological Sciences | Year: 2010

Background: Plant based repellent against mosquito borne diseases are used recently because synthetic repellents cause side effects like breathing problem, eye irritation, head ache, cough, etc. The use of natural products for dengue control would protect the environment, reduce dependence on expensive synthetic repellents and also generate local employment. Material and Methods: Essential oil was isolated by steam distillation which was used against the bites of Aedes aegypti and duration of protection period was assessed. Skin-irritant potential test was also conducted on 25 healthy volunteers by using four-point scale. Results: The increase in the concentrations of essential oil increased the mean protection time against the bites of Aedes aegypti. The lowest mean protection time was 180.0 min for 2.5% and highest time of 255.0 min for 10%. The mean score of zero for skin-irritant potential test for all the concentrations indicated that the essential oil did not cause irritation to human skin. Conclusions: Results indicated that the use of plant based repellent for the control of dengue fever would replace the currently used synthetic repellents which causes many side effects. Source


Karthikeyan N.,Parisutham Institute of Technology and Science | Joseph Prince J.,Anna University | Ramalingam S.,Avc College | Periandy S.,Tagore Arts College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

In the present methodical study, FT-IR, FT-Raman and NMR spectra of the (2,4,5-Trichlorophenoxy) Acetic acid are recorded. The observed fundamental frequencies (IR and Raman) are assigned according to their distinctiveness region. The hybrid computational calculations are carried out by HF and DFT (B3LYP and B3PW91) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets and the corresponding results are tabulated. The impact of the presence of tri-chlorine atoms in phenyl structure of the compound is investigated. The vibrational sequence pattern of the molecule related to CH2COOH is analyzed. Moreover, 13C NMR and 1H NMR are calculated by using the gauge independent atomic orbital (GIAO) method with B3LYP methods and the 6-311++G(d,p) basis set and their spectra are simulated and the chemical shifts related to TMS are compared. A study on the electronic and optical properties; absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies, are performed by HF and DFT methods. The Kubo gap of the present compound is calculated related to HOMO and LUMO energies which confirm the occurring of charge transformation between the base and ligand group. Besides frontier molecular orbitals (FMO), molecular electrostatic potential (MEP) was performed. NLO properties related to Polarizability and hyperpolarizability are also discussed. © 2014 Published by Elsevier B.V. All rights reserved. Source


Ayeshamariam A.,Khadir Mohideen College | Ramalingam S.,Avc College | Bououdina M.,University of Bahrain | Jayachandran M.,CSIR - Central Electrochemical Research Institute
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

In this work, pure and singe phase SnO2 Nano powder is successfully prepared by simple sol-gel combustion route. The photo luminescence and XRD measurements are made and compared the geometrical parameters with calculated values. The FT-IR and FT-Raman spectra are recorded and the fundamental frequencies are assigned. The optimized parameters and the frequencies are calculated using HF and DFT (LSDA, B3LYP and B3PW91) theory in bulk phase of SnO2 and are compared with its Nano phase. The vibrational frequency pattern in nano phase gets realigned and the frequencies are shifted up to higher region of spectra when compared with bulk phase. The NMR and UV-Visible spectra are simulated and analyzed. Transmittance studies showed that the HOMO-LUMO band gap (Kubo gap) is reduced from 3.47 eV to 3.04 eV while it is heated up to 800 C. The Photoluminescence spectra of SnO 2 powder showed a peak shift towards lower energy side with the change of Kubo gap from 3.73 eV to 3.229 eV for as-prepared and heated up to 800 C. © 2013 Published by Elsevier B.V. All rights reserved. Source


Krishna K.S.,Jawaharlal Nehru Centre for Advanced Scientific Research | Vivekanandan G.,Avc College | Ravinder D.,Jawaharlal Nehru Centre for Advanced Scientific Research | Eswaramoorthy M.,Jawaharlal Nehru Centre for Advanced Scientific Research
Chemical Communications | Year: 2010

Unusual morphologies of silica, gold and carbon were obtained by using ZnO nanostructures as templates. Microdrums and pencil-shaped ZnO nanostructures are successfully replicated into silica, gold and carbon analogues which are otherwise difficult to make. © The Royal Society of Chemistry 2010. Source


Prabhu T.,Avc College | Periandy S.,Tagor Arts College | Mohan S.,Hawassa University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

A combined experimental and theoretical study on molecular and vibrational structure of 2,3-dimethyl naphthalene (2,3-DMN) has been undertaken in the present work. The FTIR and FT Raman spectra of 2,3-DMN were recorded in the region 4000-100 cm-1. The optimized geometries were calculated by HF and DFT (B3LYP) methods with 6-31++G (d, p), 6-311G (d, p) and 6-311++G (d, p) basis sets. The harmonic vibrational frequencies, infrared intensities and Raman activities of the 2,3-DMN were evaluated with these methods. After scaling the computational wave numbers are in very good agreement with the experimental values. A detailed interpretation of the infrared and Raman spectra of 2,3-DMN is presented. The effects of substitution of methyl group on the molecule have also been discussed. © 2010 Elsevier B.V. All rights reserved. Source

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