Time filter

Source Type

Umapathy V.,Bharathiar University | Umapathy V.,Caplin Point Laboratories Ltd | Manikandan A.,Presidency College at Chennai | Arul Antony S.,Presidency College at Chennai | Ramu P.,Meenakshi Academy of Higher Education and Research
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2015

Bismuth molybdate (Bi2MoO6) nano-particles (NPs) were synthesized using bismuth nitrate, ammonium molybdate, citric acid and ethyl cellulose by a simple sol-gel method. The structure, morphology, opto-magnetic and photocatalytic properties of the obtained powder were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, high resolution scanning electron microscopy (HRSEM), energy dispersive X-ray (EDX), ultraviolet-visible diffuse reflectance spectra (DRS), photoluminescence (PL) spectra and vibrating sample magnetometer (VSM) techniques. The XRD, FT-IR and EDX results indicate that the resultant powder is pure and single phase crystalline Bi2MoO6 with orthorhombic structure. The HRSEM image shows that the morphology of obtained powder consists with well defined nano-particles structure. The VSM results show superparamagnetic behavior of the obtained nano-particles. The photocatalytic activity of Bi2MoO6 nano-particles was performed. The addition of TiO2 catalyst enhances the photocatalytic activity of Bi2MoO6 nano-particles. The catalysts Bi2MoO6, TiO2 and mixed oxide catalyst Bi2MoO6-TiO2 nano-composites (NCs) were tested for the photocatalytic degradation (PCD) of 4-chlorophenol (4-CP). It is found that the PCD efficiency of Bi2MoO6-TiO2 NCs is higher than that of pure Bi2MoO6 and TiO2 catalysts. © 2015 The Nonferrous Metals Society of China.

Ramu P.,Meenakshi Academy of Higher Education and Research | Augustine Arul Prasad T.,D G Vaishnav College | Vithiya S.M.,Auxilium College | Arul Antony S.,Presidency College at Chennai
Der Pharma Chemica | Year: 2014

Reaction of isatin with acetophenone derivatives gave 3-hydroxy-3-phenacyl oxindole derivative (6), dehydration of (6) gave 3-phenacylidene-2-indolinone derivative (7). Reaction of (7) with sarcosine and acenaphthenequinone yield novel spirooxindole derivatives which are characterized by various spectral methods. The compounds were subjected to antibacterial and antifungal studies and the results are very promising.

Chinnaraj K.,Bharathiar University | Manikandan A.,Presidency College at Chennai | Ramu P.,Meenakshi Academy of Higher Education and Research | Antony S.A.,Presidency College at Chennai
Journal of Superconductivity and Novel Magnetism | Year: 2014

Spinel iron oxide (Fe3O4) nanostructures were synthesized by a simple microwave-assisted combustion method (MACM) using glycine as the fuel. For the purpose of comparative study, it was also prepared by a simple sol-gel-assisted combustion method (SACM). The as-prepared samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, high-resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray spectroscopy (EDX), UV-Visible diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, and vibrating sample magnetometry (VSM) techniques. XRD and EDX results confirmed that the as-prepared products were pure spinel Fe3O4 without any impurity. Average crystallite size is found to be 12.15 and 28.47 nm for MACM and SACM products, respectively. HR-SEM analysis shows that nanospheres (NSs) and nanoparticles (NPs) have like morphologies by MACM and SACM methods, respectively. Band-gap (Eg) energy of the sample NSs is 2.44 eV, whereas the sample NPs have 2.19 eV. Magnetic hysteresis (M-H) loops revealed that the as-prepared Fe3O4 samples have superparamagnetic behavior at room temperature with saturation magnetization (Ms) values in the range of 38.53 and 46.51 emu/g for the sample NSs and NPs, respectively. The oxidation of benzyl alcohol into benzaldehyde reached a maximum of 67.43 % for NSs, whereas for NPs, the conversion was only 59.67 % with 100 % selectivity. © 2014, Springer Science+Business Media New York.

Rama Krishna Reddy Y.V.,Frontier Lifeline Hospital | Mahendra J.,Meenakshi Ammal Dental College | Gurumurthy P.,Meenakshi Academy of Higher Education and Research | Jayamathi,Meenakshi Ammal Dental College | Babu S.,Frontier Lifeline Hospital
Journal of Clinical and Diagnostic Research | Year: 2015

Introduction: Although the cardiovascular disease (CVD) burden is rising in different countries, the morbidity and mortality rate is not reduced to much extent because of lack of application of the biomarkers for diagnosing CVD. Hence, we aimed to establish the predictable biomarkers in conjunction to framingham risk score in order to predict the risk for CVD in non cardiac patients.Materials and Methods: Three hundred subjects were screened for the study who came for the master health checkup. Out of them 50 patients were excluded as they were under medication. 23 patients were excluded due to various systemic diseases like fever and infection etc. The remaining of 227 patients with age range of 30-80 y was randomly selected for investigation. These subjects were divided into four different groups: Group I – controls with age range: 30-60 y (n=50) these subjects were free from all the systemic ailments and risk factors. Study groups comprised of Group II - (n=44) with age range: 30-40 y, Group III - (n=50) with age range: 41-50 y and Group IV - (n=83) with age range: 51-80 y. Patients with different risk factors without medication participated as study groups. Routine biochemical parameters were analysed using fully automated analyser and atherosclerotic biomarkers was analysed using ELISA kit. In addition to this, framingham risk scores was calculated in all the groups, for 30 y risk prognosis for CVD.Results: The atherosclerotic biomarkers such as E-selectin, Leptin, osteoprotegerin (OPG) and Ox-LDL were elevated among the study groups as compared to control group. Pearson correlation showed a significant association between the individual risk score (30 y framingham risk for CVD) of individuals, and the above biomarkers. The Receiver operating curve (ROC) analysis also showed a greater area under curve with higher sensitivity and specificity.Conclusion: We conclude the application E-Selectin, leptin, OPG and Ox-LDL as biomarkers along with the framingham risk scores in prediction risk for CVD in the individuals with subclinical atherosclerosis. It is more reliable and predictable as compared to the individual biomarkers alone. © 2015, Journal of Clinical and Diagnostic Research. All rights reserved.

Yuvaraja T.,Meenakshi Academy of Higher Education and Research | Gopinath M.,NGP
Asian Journal of Pharmaceutical and Clinical Research | Year: 2015

The modern heuristic techniques mainly include the application of the artificial intelligence approaches such as genetic algorithm, particle swarm optimization algorithm, ant colony optimization, stochastic diffusion search, differential evolution, etc. The main aspect of these techniques is their flexibility for solving the optimization problems that have different mathematical constraints. In a power system area, the competition between the electric utilities is gradually increased due to the deregulation of the electrical markets. For this reason, the generation expansion problem presents itself as an important issue that needs to be considered in order to achieve reasonable economic decisions. © 2015, Asian Journal of Pharmaceutical and Clinical Research. All rights reserved.

Discover hidden collaborations