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Marimuthu A.,Government Arts College Autonomous | Kavitha A.,Kongunadu Arts and Science College Autonomous
International Review on Computers and Software | Year: 2014

Cloud computing is a widely used distributed computing model which offers a wide range of users with distributed access to scalable and virtualized hardware. Scheduling of tasks in cloud computing is a Nondeterministic Polynomial (NP) hard optimization problem and it has become an attractive research area in recent years. In task scheduling, the essential factor to be considered is the load balancing of non-preemptive independent tasks on Virtual Machines (VMs). In cloud computing system, the utilization of resources for the task and efficient detection of VM for task processing becomes difficult, as some VMs are heavily overloaded where as others are not heavily loaded. In order to overcome these problems, an efficient load balancing algorithm is used in this work. In this proposed system, initially overloading of VM are estimated based on the Hidden Semi Markov Model (HSMM) to maximize or minimize lifetime process, less latency and imbalanced degree for the clouds of different sizes. Artificial Fish is used to balance the task allocation for VM after overloaded is detected from HSMM. The proposed artificial fish swarm based algorithm effectively designs the priorities of tasks which in turn minimizes the waiting time of the tasks in the queue. The proposed approach shows that it achieves less unbalancing results and performs task faster with a reduction in waiting time of tasks in queue. © 2014 Praise Worthy Prize S.r.l. - All rights reserved.

Gokul B.,Kongunadu Arts and Science College Autonomous | Matheswaran P.,Kongunadu Arts and Science College Autonomous | Sathyamoorthy R.,Kongunadu Arts and Science College Autonomous
Journal of Materials Science and Technology | Year: 2013

Cadmium oxide (CdO) thin films were prepared by successive ionic layer adsorption and reaction (SILAR) method and annealed at 250-450 °C for 2 h. The prepared films were characterized by X-ray diffraction (XRD), optical spectroscopy, scanning electron microscopy (SEM) and Hall effect measurement. The XRD analysis reveals that the films were polycrystalline with cubic structure. Both crystallinity and the grain size were found to increase with increasing annealing temperature. SEM analysis shows the porous nature of the surface with spherical nanoclusters. Energy dispersive spectroscopic analysis (EDS) confirmed the presence of Cd and O elements without any additional impurities. The films exhibited maximum transmittance (82%-86%) in infra-red (IR) region. Transmittance was found to decrease with increasing annealing temperature and the estimated band gap energy (Eg) was in the range of 2.24-2.44 eV. Hall effect measurement shows an increase in carrier concentration and a decrease in resistivity with increasing annealing temperature. The carrier concentration (N) and resistivity (ρ) of about 1.26 × 1022 cm-3 and 8.71 × 10-3 Ω cm are achieved for the film annealed at 450 °C for 2 h. © 2013.

Gokul B.,Kongunadu Arts and Science College Autonomous | Matheswaran P.,Kongunadu Arts and Science College Autonomous | Abhirami K.M.,Kongunadu Arts and Science College Autonomous | Sathyamoorthy R.,Kongunadu Arts and Science College Autonomous
Journal of Non-Crystalline Solids | Year: 2013

NiO nanoparticles were prepared by wet chemical precipitation and dielectric, AC conductivity, and impedance properties were studied by complex impedance spectroscopy as a function of frequency at different temperatures. Non-stoichiometric sample (Ni40O60) shows diffraction peaks corresponding to cubic NiO and near stoichiometric sample (Ni 48O52) was found to be amorphous. Stoichiometry of NiO nanoparticles was determined using EDS analysis. The estimated dielectric constant was found to be 35 and 40 for Ni40O60 and Ni 48O52 nanoparticles. Loss peak shifts to the higher frequency which is due to long range hopping of charge carriers. Impedance analysis reveals Debye type relaxation process. The presence of two semicircular arcs in Nyquist plot explains that the grain and grain boundary conduction prevails in the sample. Nyquist plot shows that NiO nanoparticles possess negative temperature coefficient of resistance (NTCR). The variation of AC conductivity as function of temperature indicates that the conduction is due to thermally activated charge carriers. © 2012 Elsevier B.V.

Mageshwari K.,Kongunadu Arts and Science College Autonomous | Sathyamoorthy R.,Kongunadu Arts and Science College Autonomous | Sudhagar P.,Hanyang University | Kang Y.S.,Hanyang University
Applied Surface Science | Year: 2011

Nanostructured bismuth sulfide thin films were prepared onto glass substrates with particle size of 21 nm by thermal evaporation using readily prepared bismuth sulfide nanocrystallite powder. The X-ray diffraction pattern revealed that bismuth sulfide thin films exhibit orthorhombic structure. The existence of quantum confinement effect was confirmed from the observed band gap energy of 1.86 eV. AC and DC electrical conductivity of Al/BiSnc/Al structures was investigated in the frequency range 0.5-100 kHz at different temperatures (303-463 K) under vacuum. The AC conductivity (σac) is found to be proportional to angular frequency (ωs). The obtained experimental result of the AC conductivity showed that the correlated barrier hopping model is the appropriate mechanism for the electron transport in the nanostructured bismuth sulfide thin films. DC conduction mechanism in these films was studied and possible conduction mechanism in the bismuth sulfide thin films was discussed. © 2011 Elsevier B.V.

Rajeswari P.,Kongunadu Arts and Science College Autonomous | Krishnakumari S.,Kongunadu Arts and Science College Autonomous
International Journal of Pharmacy and Pharmaceutical Sciences | Year: 2013

Objectives: As vegetables, fruits and medicinal plants, mushrooms have become attractive as a functional food and as a source for the development of drugs and nutraceuticals. The present study was carried to find the antihyperglycemic effect of the milky mushroom, Calocybe indica. Materials and methods: Female swiss albino rats weighing 200-250g were used for the study. Streptozotocin was used to induce diabetes mellitus. Hot and cold water decoctions of the milky mushroom, Calocybe indica (20ml/kg body weight) was orally administered to the diabetic rats for 45 days. The blood glucose, serum insulin, hemoglobin, glycosylated hemoglobin and total blood count and the survival and mortality rate were studied. Results: The blood glucose level was significantly decreased in the decoction treated diabetic rats. Serum insulin level was increased and the glycosylated hemoglobin level was significantly altered back to the near normal level. The treatment has effect also in hematological parameters. The survival rate was significantly increased in the decoction treated rats. Conclusion: The results suggests that both hot and cold water decoction of the mushroom possess antidiabetic activity but when compared, the cold water decoction showed more significant activity than the hot water decoction.

Sindhu S.,Kongunadu Arts and Science College Autonomous | Manorama S.,Kongunadu Arts and Science College Autonomous
Journal of Chemical and Pharmaceutical Research | Year: 2012

Polycarpaea corymbosa are widely used traditional medicinal plant to treat various ailments. The antimicrobial potential of Polycarpaea corymbosa against human pathogenic microorganisms (fifteen bacteria and six fungus) ware investigated. Antimicrobial activity of various plants extracts was compared with commercially available antibiotics. The antimicrobial potential of the above plant extracts was seen against the test organism using disc diffusion method. The phytochemical prospection of the dried aerial and root extracts showed the presence of different classes of secondary metabolites, as phenols, flavonoid, alkaloids and tannins that have demonstrated antimicrobial action. Acetone and methanolic extracts showed considerably good antibacterial activity against all bacteria and fungi. This study shed the light on the ability of extracts from the plant to combat pathogens which will help as natural antimicrobial agents as well as can be used in pharmaceutical and food preservation systems.

Sindhu S.,Kongunadu Arts and Science College Autonomous | Manorama S.,Kongunadu Arts and Science College Autonomous
Asian Journal of Pharmaceutical and Clinical Research | Year: 2012

The methanolic extracts of Polycarpaea corymbosa Lam. root and aerial parts were evaluated for their in vitro antioxidant potential. The crude methanolic extracts exerted significant (P<0.005) antioxidant activity as evidenced by its Total Phenol content, Total Flavanoid content, 1,1-diphenyl-2- picrylhydrazyl radical (DPPH•), reducing power assay, ABTS•+ and metal chelating activities. The methanolic root extract was found to have significant radical scavenging activity as compared to the synthetic antioxidant BHT. From the results of the present investigation, it could be concluded that Polycarpaea corymbosa extracts can be explored as a potential source for the isolation of natural antioxidant agents. However, an appropriate solvent extraction system should be used to recover potent antioxidant components from Polycarpaea corymbosa.

Sangeetha B.,Kongunadu Arts and Science College Autonomous | Krishnakumari S.,Kongunadu Arts and Science College Autonomous
International Journal of Pharma and Bio Sciences | Year: 2010

Herbal drugs are traditionally used in various parts of the world to cure different diseases. The present study has been conducted to evaluate the protective role of the ethanolic extract of the root of Tephrosia purpurea; an important Indian medicinal plant widely used in the preparation of ayurvedic formulations, on CCl 4 induced oxidative damage and resultant dysfunction in the liver of rats. The experiments were performed using five groups of animals. The experimental animals were administered with 30% CCl 4 in liquid paraffin (1ml/kg bw) for 10 days at 72 hr intervals and the fine crude plant root powder ethanolic extract (EETP) and Silymarin a standard drug, 25 mg/kg bw were fed to the CCl 4 treated animals. The effect of EETP and silymarin on Total protein, albumin, bilirubin, cholesterol and glycogen were measured. Further, the effects of the extract on hepatospecific enzymes such as, aspartate transaminase (AST), alanine transaminase (ALT), acid phosphatase (ACP), alkaline phosphatase (ALP), lactate dehydrogenase (LDH) and 5' nucleotidase (5'NT) were estimated. The EETP and Silymarin produced significant effect by decreasing the serum levels of bilirubin and cholesterol whereas Total protein, albumin, glycogen and hepatospecific enzymes were significantly increased. From these results, it was suggested that Tephrosia purpurea protects the liver against CCl 4 induced oxidative damage probably by increasing antioxidative defense activities.

Daniel G.,Kongunadu Arts and Science College Autonomous | Krishnakumari S.,Kongunadu Arts and Science College Autonomous
International Journal of Pharma and Bio Sciences | Year: 2015

In the last few years there has been an exponential growth in the field of herbal medicine and these drugs are gaining popularity both in developing and developed countries because of their natural origin and less side effects. The current study focuses on qualitative phytochemical screening of primary and secondary metabolites in Eugenia uniflora leaves with different solvents like methanol, ethanol, chloroform, petroleum ether, ethyl acetate, acetone, aqueous cold and hot extracts. Primary metabolites like carbohydrates, proteins, amino acids and secondary metabolites like alkaloids, flavonoids, saponins, tanins, phenols, fattyacids, anthraquione, acids, terpenoids, triterpenoids, sterols, cardiac glycosides, coumarins, carbohydrates, protein, resins, gum & mucilages, phlobtanins, quinones, oxalate, anthocyanin, anthracenoids, emodins, chalcones, anthocyanosides and volatile oils were screened successfully using standard methods. The results obtained in the present study indicates Eugenia uniflora leaves have the potential to act as a source of useful drugs because of the presence of various primary and secondary metabolites. The results are very much encouraging but scientific validation is necessary before being put into practice.

Nisha M.C.,Kongunadu Arts and Science College Autonomous
Indian Journal of Natural Products and Resources | Year: 2010

In order to prepare a list of the raw drugs sold in Coimbatore city, a market survey was conducted. There are 72 species spreading over 41 families and according to their life forms, 29 are herbs, 13 shrubs, 23 trees and 7 climbers and 88% of these belong to the dicotyledons. It was also noticed that various plant parts were used as crude drugs. The species like Acacia nilotica (Linn.) Willd. ex Del. subsp. indica (Benth.) Brenan, Andrographis paniculata (Burm. f.) Wall. ex Nees, Eclipta prostrata (Linn.) Linn., Adhatoda zeylanica Medic., Zingiber officinale Rosc., Acorus calamus Linn., Centella asiatica (Linn.) Urban, Phyllanthus amarus Schum. & Thonn., Solanum nigrum Linn. and Gymnema sylvestre (Retz) Schult. have higher market potential. Most of the crude drugs are already commercially cultivated in India but a few endangered plants like Dysoxylum malabaricum Bedd., Rauvolfia serpentina Benth. ex Kurz are also sold in the market. If the same trend continues, we may have to lose our valuable plant heritage by way of over exploitation of the wild and endangered species. There is an urgent need of documentation of this irreplaceable knowledge to meet the ever growing demand of medicinal plants in the market.

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