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Phytochemical composition and in vitro antioxidant activity of aqueous extract of Aerva lanata(L.) *** ***(Amaranthaceae)

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Asian Pacific Journal of Tropical Medicine 2013年第3期6卷 180-187页

作者： Gaurav Kumar Loganathan karthik Kokati Vankata Bhaskara Rao Molecular and Microbiology Research Laboratory Environmental Biotechnology DivisionSchool of Bio Sciences and TechnologyVIT UniversityVelloreTamil Nadu-632 014India

Objective:To analyze the phytochemical composition and in vitro antioxidant properties of aqueous extract of Aerva Lanata（***） ***:During the preliminary phytochemical analysis,the aqueous extract of *** was screened for the presence of carbohydrates,proteins,phenolic compounds,oil and fats,saponins,flavonoids,alkaloids. tannins and *** activity of the extract was determined by 2.2-dipbenyl- 1-picrylhydrazyl radical scavenging activity,metal chelating activity,reducing power activity and DNA damage inhibition *** of phenolic compounds was performed by FolinCiocaiteau reagent method and gradient high performance liquid chromatography technique. Results:Preliminary phytochemical analysis exhibited the presence of phenolic compounds, *** and phytosterols as major phytochemical *** extract exhibited high 2.2—diphenyl-1-picrylhydrazyl radical scavenging activity(IC50= 110.74μg/ mL).metal chelating activity(IC50= 758.17μg/mL).reducing power activity and DIA damage inhibition *** extract was reported to possess a high amount of total phenolic content and some of them were identified as gallic acid（3,4,3-OH）,apigenin-7—O-glucoside tapigetrin), quercetin-3—O-rutinoside（rutin） and myricetin（3,5,7,3,4,5-OH）by high performance liquid chromatography *** extract was found non toxic towards human erythrocytes in the hemolytic assay(IC50= 24.89 mg/mL).Conclusions:These results conclud that *** stem possesses high antioxidant activity and can he used for the development of natural and sale antioxidant compounds.

关键词： Aerva lanata Antioxidant DPPH radical scavenging assay Phenolic compounds Hemolytic activity

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A Quasi-Newton Neural Network Based Efficient Intrusion Detection System for Wireless Sensor Network

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Computer Systems Science & Engineering 2023年第4期45卷 427-443页

作者： A.Gautami J.Shanthini S.karthik Department of Electronics and Communication Engineering SNS College of TechnologyCoimbatoreTamilnaduIndia Department of Computer Science&Engineering Dr.N.G.P Institute of TechnologyCoimbatoreTamilnaduIndia Department of Computer Science&Engineering SNS College of TechnologyCoimbatoreTamilnaduIndia

In Wireless Sensor Networks(WSN),attacks mostly aim in limiting or eliminating the capability of the network to do its normal *** this misbehaviour is a demanding *** so far the prevailing research methods show poor ***3 centred efficient Intrusion Detection Systems(IDS)is proposed in WSN to ameliorate the *** proposed system encompasses Data Gathering(DG)in WSN as well as Intrusion Detection(ID)*** DG,the Sensor Nodes(SN)is formed as clusters in the WSN and the Distance-based Fruit Fly Fuzzy c-means(DFFF)algorithm chooses the Cluster Head(CH).Then,the data is amassed by the discovered ***,it is tested with the trained *** IDS encompasses‘3’steps:pre-processing,matrix reduction,and *** pre-processing,the data is organized in a clear ***,attributes are presented on the matrix format and the ELDA(entropybased linear discriminant analysis)lessens the matrix ***,the output as of the matrix reduction is inputted to the QN3 classifier,which classifies the denial-of-services(DoS),Remotes to Local(R2L),Users to Root(U2R),and probes into attacked or Normal *** an experimental estimation,the proposed algorithm’s performance is contrasted with the prevailing *** proposed work attains an enhanced outcome than the prevailing methods.

关键词： Distance fruit fly fuzzy c-means(DFFF) entropy-based linear discriminant analysis(ELDA) Quasi-Newton neural network(QN3) remote to local(R2L) denial of service(DoS) user to root(U2R)

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Antioxidant activity of newly discovered lineage of marine actinobacteria

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Asian Pacific Journal of Tropical Medicine 2013年第4期6卷 325-332页

作者： Loganathan karthik Gaurav Kumar Kokati Venkata Bhaskara Rao Environmental Biotechnology Division School of Bio Sciences and TechnologyVIT UniversityVelloreTamil NaduIndia

Objective:To investigate the antioxidant activity of marine ***:The content of total phenolics,the level of antioxidant potential by DPPH radical scavenging activity,metal chelating activity,FRAP method,βcarotene assay and NO scavenging activity in extract were ***:In all the methods the extract exhibited good scavenging activity except NO scavenging *** IC50 values of marine actinobacteria extract on DPPH radical were found to be 41.09μg/*** zone of color retention was 12 mm inβ-carotene bleaching assay. DNA protective efficiency of the extracts was also studied using UV- photolysed H2O2-driven oxidative damage to *** analysis identified some of the major phenolic compounds in extracts,which might he responsible for the antioxidant potential and *** showed a 100%cytotoxic effect in brine shrimp lethality assay within 10 *** novel actinobacteria was identified as Streptomyces LK-3（JF710608） through I6S rDNA ***:The results obtained suggest that the extracts bear anti-cancer metabolites and could be considered as a potential source for anti-cancer drug development.

关键词： Streptomyces LK-3 Antioxidant DPPH radical scavenging assay Cytotoxicity

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Graphene-Based Coronal Hybrids for Enhanced Energy Storage

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Energy Material Advances 2021年第1期2021卷 218-232页

作者： karthik Kiran Sarigamala Shobha Shukla Alexander Struck Sumit Saxena Centre for Research in Nanotechnology and Science Indian Institute of Technology Bombay400076MumbaiIndia Nanostructures Engineering and Modelling Laboratory Department of Metallurgical Engineering and Materials ScienceIndian Institute of Technology Bombay400076MumbaiIndia Faculty of Technology and Bionics Rhein-Waal University of Applied SciencesKleveGermany 47533

Functional materials with designer morphologies are anticipated to be the next generation materials for energy storage *** this manuscript,we have developed a holistic approach to enhance the surface area and hence the properties of nanostructures by synthesizing coronal nanohybrids of *** nanohybrids provide distinctive advantages in terms of performance and stability over vertically stacked nanocomposites reported in *** double hydroxide materials self-assembled as coronal lamellae on graphene shells have been synthesized and systematically *** coronal nanohybrids result in about a threefold increase in energy storage capacity as compared to their traditionally synthesized nanocomposite *** 3D graphene-based nanofibrils in the synthesized coronal nanohybrids provide mechanical support and connect the nodes of the double hydroxide lattices to inhibit *** morphologies such as coronal nanostructures increase the interaction surface of the nanostructure *** an approach is also expected to bring a paradigm shift in development of functional materials for various applications such as sensors,energy storage,and catalysis.

关键词： hydroxide hence shells

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Prospects for discriminating Zingiberaceae species in India using DNA barcodes

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Journal of Integrative Plant Biology 2014年第8期56卷 760-773页

作者： Meenakshi ramaswamy Vinitha Unnikrishnan Suresh Kumar Kizhakkethil Aishwarya Mamiyil Sabu George Thomas Plant Molecular Biology Rajiv Gandhi Centre for BiotechnologyThiruvananthapuram Kerala 695014 India Regional Facility for DNA Fingerprinting Rajiv Gandhi Centre for BiotechnologyThiruvananthapuram Kerala 695014 India Department of Botany University of Calicut

We evaluated nine plastid （matK, rbcL, rpoCl, rpoB, rp136-rpsS, ndhJ, trnL-F, tmrnH-psbA, accD） and two nuclear （ITS and ITS2） barcode loci in family Zingiberaceae by analyzing 60 accessions of 20 species belonging to seven genera from India. Bidirectional sequences were recovered for every plastid locus by direct sequencing of polymerase chain reaction （PCR） amplicons in all the accessions tested. However, only 35 （58%） and 4o accessions （66~） yielded ITS and ITS2 sequences, respectively, by direct sequencing. In different bioinformatics analyses, matK and rbcL consistently resolved 15 species （75%） into monophyletic groups and five species into two para- phyletic groups. The 173 ITS sequences, including 138 cloned sequences from 23 accessions, discriminated only 12 species （6o%）, and the remaining species were entered into three paraphyletic groups. Phylogenetic and genealogic analyses of plastid and ITS sequences imply the possible occurrence ofnatural hybridizations in the evolutionary past in giving rise to species paraphyly and intragenomic ITS heterogeneity in the species tested. The results support using matK and rbcL loci for barcoding Zingiberaceae members and highlight the poor utility of iTS and the highly regarded ITS2 in barcoding this family, and also caution against proposing ITS loci for barcoding taxa based on limited sampling.

关键词： Concerted evolution DNA barcoding ITS heterogeneity natural hybridizations Zingiberaceae

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Effect of fusion welding processes on tensile properties of armor grade, high thickness, non-heat treatable aluminium alloy joints

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Defence Technology（防务技术） 2019年第3期15卷 353-362页

作者： K. Vasu H. Chelladurai Addanki ramaswamy S. Malarvizhi V. Balasubramanian Department of Mechanical Engineering PDPM Indian Institute of Information Technology Design and Manufacturing Jabalpur Madhya pradesh 482005 India Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing Engineering Annamalai University Annamalai Nagar -(P.O) Tamil nadu 608002 India

AA5059 is one of the high strength armor grade aluminium alloy that finds its applications in the military vehicles due to the higher resistance against the armor piercing (AP) threats. This study aimed at finding the best suitable process among the fusion welding processes such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) by evaluating the tensile properties of AA5059 aluminium alloy joints. The fracture path was identified by mapping the low hardness distribution profile (LHDP) across the weld cross section under tensile loading. Optical and scanning electron microscopies were used to characterize the microstructural features of the welded joints at various zones. It is evident from the results that GTAW joints showed superior tensile properties compared to GMAW joints and this is primarily owing to the presence of finer grains in the weld metal zone (WMZ) and narrow heat-affected zone (HAZ). The lower heat input associated with the GTAW process effectively reduced the size of the WMZ and HAZ compared to GMAW process. Lower heat input of GTAW process results in faster cooling rate which hinders the grain growth and reduces the evaporation of magnesium in weld metal compared to GMAW joints. The fracture surface of GTAW joint consists of more dimples than GMAW joints which is an indication that the GTAW joint possess improved ductility than GMAW joint.

关键词： Gas tungsten arc welding Gas metal arc welding Armor grade aluminium alloy Tensile properties Microhardness

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Improved Load-Balanced Clustering for Energy-Aware Routing(ILBC-EAR)in WSNs

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Computer Systems Science & Engineering 2023年第1期44卷 99-112页

作者： D.Loganathan M.Balasubramani R.Sabitha S.karthik Department of Electronics and Communication Engineering Info Institute of EngineeringCoimbatore641107India Department of Computer Science and Engineering SNS College of TechnologyCoimbatore641035India

Sensors are considered as important elements of electronic *** many applications and service,Wireless Sensor Networks(WSNs)are involved in significant data sharing that are delivered to the sink node in energy efficient man-ner using multi-hop ***,the major challenge in WSN is the nodes are having limited battery resources,it is important to monitor the consumption rate of energy is very much ***,reducing energy con-sumption can increase the network lifetime in effective *** that,clustering methods are widely used for optimizing the rate of energy consumption among the sensor *** that concern,this paper involves in deriving a novel model called Improved Load-Balanced Clustering for Energy-Aware Routing(ILBC-EAR),which mainly concentrates on optimal energy utilization with load-balanced process among cluster heads and member *** providing equal rate of energy consumption among nodes,the dimensions of framed clusters are ***,the model develops a Finest Routing Scheme based on Load-Balanced Clustering to transmit the sensed information to the sink or base *** evaluation results depict that the derived energy aware model attains higher rate of life time than other works and also achieves balanced energy rate among head ***,the model also provides higher throughput and minimal delay in delivering data packets.

关键词： Wireless sensor networks energy consumption load balanced clustering finest routing

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Evolution of stellated gold nanoparticles:New conceptual insights into controlling the surface processes

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Nano Research 2022年第2期15卷 1260-1268页

作者： Gurvinder Singh Hesamodin Jami Pooria Lesani Shubhayan B.hattacharya Yogambha ramaswamy Prem BBisht Hala Zreiqat ARC Centre for Innovative BioEngineering Tissue Engineering and Biomaterials Research UnitSydney Nano Institute and the School oj Biomedical EngineeringThe University of SydneyNSW 2008Australia Department of Physics Indian Institute of Technology MadrasChennaiIndia

Understanding the surface processes(deposition and surface diffusion)that occur at or close to the surface of growing nanoparticles is important for fabricating reproducibly stellated or branched gold nanoparticles with precise control over arm length and spatial orientation of arms around the *** employing a simple seed-mediated strategy,we investigate the key synthetic variables for precise tuning of in situ surface processes(competition between the deposition and surface diffusion).These variables include the reduction rate of a reaction,the packing density of molecules/ions on the high surface energy facets,and *** a result,the thermodynamically stabilized nanoparticles(cuboctahedron and truncated cube)and kinetic products(cube,concave cube,octapod,stellated octahedron,and rhombic dodecahedron)in different sizes with high quantitative shape yield(>80%)can be obtained depending on the reduction rate of reaction and the packing density of molecules/*** computer simulation,we studied the stability of stellated(branched structure)and non-stellated(non-branched structure)gold nanoparticles at high *** construct a morphology phase diagram by varying different synthetic parameters,illustrating the formation of both stellated and non-stellated gold nanoparticles in a range of reaction *** stellated gold nanoparticles display shape-dependent optical properties and can be self-assembled into highly ordered superstructures to achieve an enhanced plasmonic *** strategy can be applied to other metal systems,allowing for the rational design of advanced new stellated metal nanoparticles with fascinating symmetry dependent plasmonic,catalytic,and electronic properties for technological applications.

关键词： surface diffusion shape control stellated nanoparticles self-assembly nanoplasmonics octapod stellated octahedron

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Ferromagnetic–paramagnetic transition temperature in bulk and nanostructured La_(0.7)Sr_xCa_(0.3-x)MnO_3(x=0.10, 0.15, and 0.20) manganite materials

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Rare Metals 2017年第6期36卷 501-511页

作者： Somasundaram Praveen Kumar Kathiresan Sakthipandi Ramamurthy Gayathiri Mathu Sridhar Panday Arumugam karthik Venkatachalam Rajendran Centre for Nano Science and Technology K.S. Rangasamy College of Technology Anna University Research and Development Centre Bharathiar University

Series of bulk and nanostructured La0.7SrxCa0.3-xMnO3（x = 0.10, 0.15, and 0.20） manganites were synthesized and characterized using different techniques. In the series, both the bulk and nanostructured La0.7Sr0.10Ca0.20MnO3 and La0.7Sr0.20Ca0.10MnO3 manganites have orthorhombic and rhombohedral structures, whereas La0.7Sr0.15Ca0.15MnO3 manganite has rhombohedral and orthorhombic structures, respectively. Online ultrasonic velocity and attenuation measurements were taken through an indigenously designed ultrasonic setup, and the analysis was done from 300 to 400 K during the aging of the samples to explore the structural/phase transitions. The bulk and nanocrystalline La0.7SrxCa0.3-xMnO3 perovskite samples show the particle size distribution in the range of 197-943 and 24-93 nm, respectively. The addition of Sr^2＋ alters the size of particles, which decrease in size. The observed anomaly in ultrasonic velocities, attenuations, and elastic moduli is correlated with the ferromagnetic-paramagnetic（FM-PM） transition temperature（TC） in both bulk and nanocrystalline perovskites. In addition, the shift in TC and the magnitude and width of observed anomaly are correlated with the value of x to study the behavior of TC.

关键词： Magnetic material Ultrasonic measurements Elastic properties Phase transition

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Evaluating the effectiveness of marine actinobacterial extract and its mediated titanium dioxide nanoparticles in the degradation of azo dyes

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Journal of Environmental Sciences 2014年第4期26卷 775-782页

作者： S Priyaragini S Veena D Swetha L karthik G Kumar K V Bhaskara Rao Molecular and Microbiology Research Laboratory Environmental Biotechnology Division School of Bio Sciences and Technology VIT University

Aim of the present study was to synthesize titanium dioxide nanoparticles （YiO2 NPs） from marine actinobacteria and to develop an eco-friendly azo-dye degradation method. A total of five actinobacterial isolates were isolated from Chennai marine sediments, Tamilnadu, India and analyzed for the synthesis of TiO2 NPs using titanium hydroxide. Among these, the isolate PSV 3 showed positive results for the synthesis of TiO2 NPs, which was confirmed by UV analysis. Further characterization of the synthesized TiO2 NPs was done using XRD, AFM and FI＇-IR analysis. Actinobacterial crude extract and synthesized TiO2 NPs was found efficient in degrading azo dye such as Acid Red 79 （AR-79） and Acid Red 80 （AR-80）. Degradation percentage was found to be 81% for AR-79, 83% for AR-80 using actinobacterial crude extract and 84% for AR-79, 85% for AR-80 using TiO2 NPs. Immobilized actinobacterial ceils showed 88% for AR-79 and 81% for AR- 80, dye degrading capacity. Degraded components were characterized by FT-IR and GC-MS analysis. The phytotoxicity test with 500 μg/mL of untreated dye showed remarkable phenotypic as well as cellular damage to Tagetes erecta plant. Comparatively no such damage was observed on plants by degraded dye components. In biotoxicity assay, treated dyes showed less toxic effect as compared to the untreated dyes.

关键词： actinobacteria azo dye degradation ZiO2 NPs biotoxicity Tagetes erecta

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