Soundar Raju C.,Jamal Mohamed College |
Kathiravan K.,University of Madras |
Aslam A.,Jamal Mohamed College |
Shajahan A.,Jamal Mohamed College
Plant Cell, Tissue and Organ Culture | Year: 2013
A reproducible protocol for somatic embryogenesis was established for mango ginger (Curcuma amada Roxb.)-an important horticultural aromatic rhizomatous plant. Embryogenic callus induction was obtained from leaf sheath explants of in vitro raised plants on Murashige and Skoog (MS) agar medium containing 2.0 mg/L 2,4-dichlorophenoxyacetic acid and 0.5 mg/L 6-benzyladenine (BA). Embryogenic callus proliferation, somatic embryo (SE) formation and subsequent plantlet conversion occurred under optimal culture conditions. The effects of MS medium strength, sucrose and BA on SE formation were also evaluated. Half strength MS liquid medium necessary for SE formation and optimal sucrose concentration was found to be 3.0 %. BA at 0.3 mg/L produced the highest number (84.71 %) of SEs from leaf sheath explants. Secondary somatic embryos originated from primary somatic embryos on the same medium supplemented with 0.4-0.6 mg/L BA. Stereo microscopic and scanning electron microscopic observation revealed that the globular and torpedo shaped somatic embryos resulted in suspension culture during development. Mature somatic embryos germinated readily and developed into normal plantlets after 3 weeks on half strength MS basal agar medium under dark condition. Well rooted plantlets were successfully acclimatized at the survival rate of 70 %. © 2012 Springer Science+Business Media Dordrecht.
Hameed A.S.H.,Jamal Mohamed College |
Karthikeyan C.,Jamal Mohamed College |
Sasikumar S.,Jamal Mohamed College |
Senthil Kumar V.,Rkm Vivekananda College |
And 2 more authors.
Journal of Materials Chemistry B | Year: 2013
Pure ZnO and alkaline metal ion (Mg2+, Ca2+, Sr 2+ and Ba2+)-doped ZnO nanoparticles (NPs) were synthesized by the co-precipitation method. The synthesized nanoparticles retained the wurtzite hexagonal structure, which was confirmed by X-ray diffraction studies. The micro-strain properties were analyzed through Williamson-Hall analysis. The oxidation states of the elements (C (1s), O (1s), Zn (2p), Mg (1s), Ca (2p), Sr (3d) and Ba (3d)) were confirmed by XPS studies. HRSEM studies showed a reduction in the thickness of the ZnO nanoflakes from 63 to 47 nm after doping. EDAX studies determined the amount of dopant (alkaline metals) incorporated into the doped samples. The FT-IR spectra confirmed the Zn-O stretching bands at 432, 416, 414, 426 and 422 cm-1 for the respective ZnO NPs. The photoluminescence measurements revealed that the broad emission was composed of six different bands due to zinc and oxygen vacancies. Thermal analysis revealed that the irreversible structural transition occurred from the cubic phase to the wurtzite phase in the samples. The antibacterial studies performed against a set of bacterial strains showed that the Mg-doped ZnO NPs possessed a greater antibacterial effect than the other alkaline metal ion-doped ZnO NPs. © 2013 The Royal Society of Chemistry.
George Amalarethinam D.I.,Jamal Mohamed College |
Muthulakshmi P.,SRM University
Journal of Theoretical and Applied Information Technology | Year: 2014
The major component of any computing system is the scheduling technique that coordinates the entire system. Heterogeneous environments like grid computing environment provide the accessibility to use wide range of resources that are located around the world. In such environment resource management becomes a complex issue due to various factors like high computational demand, diversity among the tasks, heterogeneity of resources, and heterogeneity of vendors who offer services, dynamic nature of resources. An effective scheduling may increase the efficiency of resource management systems. This paper addresses a grid scheduling algorithm. The algorithm is devised to schedule the tasks on available resources. The performance of the algorithm has been evaluated for arbitrary and regular graphs. The algorithm and the compared algorithms are implemented in Java. The algorithm begins by grouping the tasks. Then tasks from various groups are compared and prioritized for scheduling. The results show that the proposed algorithm outperforms the existing algorithms. The test results of the algorithm justify that the algorithm encourages maximum utilization of resources, minimized makespan and balanced load across resources. © 2005 - 2014 JATIT & LLS. All rights reserved.
Amalarethinam D.I.G.,Jamal Mohamed College |
Muthulakshmi P.,SRM University
Advances in Intelligent and Soft Computing | Year: 2012
Scheduling is absolutely the resource management. A group of interdependent jobs/tasks forms the workflow application and scheduling is to map the jobs/tasks on to the collection of heterogeneous resources available in a massive geographic spread. Most complicated applications consist of interdependent jobs that coordinate to solve a problem. The completion of a particular job is the criterion function essentially to meet in order to start the execution of those jobs that depend upon it . This kind of workflow application may be represented in the form of a Directed Acyclic Graph (DAG). Grid Workflow is such an application and is modeled by DAG. This paper proposes a tool that generates Directed Acyclic Graph through Randomizer, which helps in solving the scheduling problem among the dependent tasks by considering the parameters, computation cost (COMPCost) of the nodes and the communication cost (COMMCost) between the nodes. This tool is developed in Java, considering it as a platform independent and web authoring application developer. The task dependencies are made random, the computation cost and communication cost are also randomly allocated by the randomizer. The output generated by the tool includes (i) a visual component of an actual DAG,(ii) a table with complete information on task, its predecessors, COMPCost, COMMCost and (iii) detailed description about the number of levels, number of tasks at each level, identification of a tasks in a level and relationship between the nodes. © 2012 Springer-Verlag GmbH.
Priya B.,Bharathidasan University |
Uma L.,Bharathidasan University |
Ahamed A.K.,Jamal Mohamed College |
Subramanian G.,Bharathidasan University |
Prabaharan D.,Bharathidasan University
Bioresource Technology | Year: 2011
Ten different strains of marine cyanobacteria were tested for their ability to decolourise and degrade a recalcitrant diazo dye, C.I. Acid Black 1. Of them, Oscillatoria curviceps BDU92191 was able to grow up to a tested concentration of 500mGL -1. The organism degraded 84% of the dye at 100mGL -1 in 8days in a medium free of combined nitrogen. The dye degrading ability is attributed to the activities of the enzymes: laccase, polyphenol oxidase and azoreductase. The absence of the doublet amine peak in addition to the overall reduction of absorption in the IR spectra confirmed the mineralisation of the tested azo dye. The nitrogen assimilating enzyme studies along with nitrogenase assay strongly suggested the ability of the non-heterocystous, filamentous marine cyanobacterium, O. curviceps BDU92191 to use C.I. Acid Black 1 as a nitrogen source in an oligotrophic environment. © 2011.
Velmurugan P.,Jamal Mohamed College |
Kamaraj M.,Jamal Mohamed College |
Prema D.,Biological and Bioinformatics Research Center
International Journal of Phytomedicine | Year: 2010
Cadaba trifoliata Roxb is belongs to the family Capparaceae, important medicinal plant of Indian medicinal plants. The methanol, ethanol, ethyl acetate and aqueous extracts along with dry powder of root were screened for the presence of phytochemicals. The phytochemical constituents were analyzed by qualitative and GC-MS method. Preliminary studies showed that the presence of Tannins, Steroids, Alkaloids, Glycosides, Flavonoids and Phenolic compounds. In the GC-MS analysis, 17 bioactive phytochemical compounds were identified in the alcoholic extract. The identification of phytochemical compounds in very high peak area, 1, 2-Benzenedicarboxylic acid, diisooctyl ester (C24H38O4) with RT 24.95 has peak area 51.86% and 1-Methyl-pyrrolidine-2-carboxylic acid (C6H11NO2) with RT 6.89 has peak area 20.58%. The main important compound phytol (C20H40O) with RT 18.95 ranks with peak area 1.21%. A nature compound contains diterpene activity anti-cancer, anti-diabetic, anti-inflammatory, anti-oxidant activity and antimicrobial activity. © arjournals.org.
Ishaq Ahamed A.,Jamal Mohamed College |
Lakshmanan M.,Bharathidasan University
International Journal of Bifurcation and Chaos | Year: 2013
In this paper, a memristive Murali-Lakshmanan-Chua (MLC) circuit is built by replacing the nonlinear element of an ordinary MLC circuit, namely the Chua's diode, with a three-segment piecewise-linear active flux controlled memristor. The bistability nature of the memristor introduces two discontinuity boundaries or switching manifolds in the circuit topology. As a result, the circuit becomes a piecewise-smooth system of second order. Grazing bifurcations, which are essentially a form of discontinuity-induced nonsmooth bifurcations, occur at these boundaries and govern the dynamics of the circuit. While the interaction of the memristor-aided self oscillations of the circuit and the external sinusoidal forcing result in the phenomenon of beats occurring in the circuit, grazing bifurcations endow them with chaotic and hyperchaotic nature. In addition, the circuit admits a codimension-5 bifurcation and transient hyperchaos. Grazing bifurcations as well as other behaviors have been analyzed numerically using time series plots, phase portraits, bifurcation diagram, power spectra and Lyapunov spectrum, as well as the recent 0-1 K test for chaos, obtained after constructing a proper Zero Time Discontinuity Map (ZDM) and Poincaré Discontinuity Map (PDM) analytically. Multisim simulations using a model of piecewise linear memristor have also been used to confirm some of the behaviors. © 2013 World Scientific Publishing Company.
Kokilavani T.,Bharathiar University |
George Amalarethinam D.I.,Jamal Mohamed College
Advances in Intelligent Systems and Computing | Year: 2013
Grid Computing is the fast growing industry, which shares the resources in the organization in an effective manner. Resource sharing requires more optimized algorithmic structure, otherwise the waiting time and response time are increased, ansd the resource utilization is reduced. In order to avoid such reduction in the performance of the grid system, an optimal resource sharing algorithm is required. The traditional min-min algorithm is a simple algorithm that produces a schedule that minimizes the makespan than the other traditional algorithms in the literature. But it fails to produce a load balanced schedule. In recent days, ACO plays a vital role in the discrete optimization problems. The ACO solves many engineering problems and provides optimal result which includes Travelling Salesman Problem, Network Routing, and Scheduling. This paper proposes Load Shared Ant Colony Optimization (LSACO) which shares the load among the available resources. The proposed method considers memory requirement as a QoS parameter. Through load sharing LSACO reduces the overall response time and waiting time of the tasks. © 2013 Springer-Verlag.
Ahamed M.A.R.,Oxford Engineering College |
Jeyakumar D.,CSIR - Central Electrochemical Research Institute |
Burkanudeen A.R.,Jamal Mohamed College
Journal of Hazardous Materials | Year: 2013
2-Amino-6-nitro-benzothiazole and thiosemicarbazide with formaldehyde (BTF) terpolymer was synthesized by the condensation polymerization technique. The elemental analysis and physico-chemical parameters of the terpolymer were measured. This chelation terpolymer was characterized by infrared, electronic and nuclear magnetic resonance (1H & 13C NMR) spectral studies. The molecular weight of the terpolymer was determined by gel permeation chromatography (GPC). Surface analysis of the terpolymer was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) method. The thermal stability of the terpolymer was analyzed by thermogravimetric analysis (TGA). The cation-exchange property of the terpolymer was determined by batch equilibrium method with the effect of pH, contact time and electrolytes. The reusability of the resin was also studied to estimate the effectiveness of the terpolymer resin. © 2013 Elsevier B.V.
Gandhi V.,Alagappa University |
Ganesan R.,Alagappa University |
Abdulrahman Syedahamed H.H.,Jamal Mohamed College |
Thaiyan M.,Ajou University
Journal of Physical Chemistry C | Year: 2014
Zn1-xCoxO (x = 0, 0.05, 0.10, and 0.15) nanoparticles (NPs) were synthesized by a coprecipitation method. The crystalline sizes of synthesized samples were calculated from the powder XRD patterns, which were found to decrease with the increase of cobalt content. The FT-IR spectra confirmed the Zn-O stretching bands at 468, 456, 452, and 461 cm-1 for the respective ZnO NPs. SEM images demonstrated the distinct flowerlike morphology. The photoluminescence spectra of all the samples exhibited a broad emission in the visible range. XPS studies were carried out for Zn 0.90Co0.10O NPs. The carriers (donors) bound on the Co sites were observed from the micro-Raman spectroscopic studies. The pure and Co-doped ZnO NPs showed significant changes in the M-H loop where the diamagnetic behavior of ZnO changes to ferromagnetic nature when doping with Co. Oxygen vacancies and zinc interstitials were found to be the main reasons for room-temperature ferromagnetism in the Co-doped ZnO NPs with the support of the results obtained from the EPR, photoluminescence, and micro-Raman studies. © 2014 American Chemical Society.