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Plasma Science and Technology 2013年第6期15卷 562-569页

作者： B.DEBALINA m.kamaraj S.R.CHAKRAVARTHI N.J.VASA R.SARATHI Dept.of metallurgical and materials Engg. IIT MadrasChennai 600036India Dept.of Aerospace Engg. IIT MadrasChennai 600036India Dept.of Engineering Design IIT MadrasChennai 600036India Dept.of Electrical Engg. IIT MadrasChennai 600036India

In the present study nano-tungsten carbide particles were generated in a wire explosion *** plasma generated during the wire explosion process was analyzed using optical emission spectroscopy（OES）.The impact of ambient pressure on the plasma temperature,electron density and plasma lifetime was *** variations of the plasma produced under different experimental conditions were *** produced nanoparticles were characterized through wide angle X-ray diffraction（WAXD） and transmission electron microscopy（TEm） studies. Particles produced with a negative DC charging voltage had a larger mean size when compared to a positive charging *** dependence on the plasma duration was observed where plasma was sustained for a longer duration with a negative DC charging voltage.

关键词： optical emission wire explosion tungsten carbide life time nano particle

AZ31B镁合金及其纳米复合材料的滑动磨损行为(英文)

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Transactions of Nonferrous metals Society of China 2012年第1期22卷 60-65页

作者： m.SRINIVASAN C.LOGANATHAN m.kamaraj Q.B.NGUYEN m.GUPTA R.NARAYANASAmY Department of mechanical Engineering Saranathan College of EngineeringTiruchirappalliTamilnadu 620012India St.Jospeh's College of Engineering and Technology ThanjavurTamilnadu 613403India Department of metallurgical and materials Engineering Indian Institute of Technology MadrasChennaiTamilnadu 600036India Department of mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Production Engineering National Institute of TechnologyTiruchirappalliTamilnadu 620015India

采用复合铸造工艺制备AZ31B镁合金及其纳米复合材料,再对所得材料在350°C进行热挤压。采用标准的销-盘式摩擦磨损试验机对AZ31B镁合金及其纳米复合材料的室温滑动磨损行为进行研究。实验条件为法向载荷10N、滑移速度0.60~1.2m/s、滑移... 详细信息

采用复合铸造工艺制备AZ31B镁合金及其纳米复合材料,再对所得材料在350°C进行热挤压。采用标准的销-盘式摩擦磨损试验机对AZ31B镁合金及其纳米复合材料的室温滑动磨损行为进行研究。实验条件为法向载荷10N、滑移速度0.60~1.2m/s、滑移距离2000m。采用SEm观察来研究磨损表面的磨损机理。通过构建一个线性回归模型来研究试验参数对磨销磨损率的影响。与AZ31B镁合金相比,由于增强体的作用而导致的硬度增强使复合材料表现出低的磨损率。犁削、犁沟、分层和氧化构成混合的磨损机理。

关键词： AZ31B镁合金纳米复合材料磨损机理

Photocatalytic degradation of endocrine disruptor Bisphenol-A in the presence of prepared Ce_xZn_(1-x)O nanocomposites under irradiation of sunlight

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Journal of Environmental Sciences 2014年第11期26卷 2362-2368页

作者： kamaraj m. Ranjith K.S. Rajeshwari Sivaraj Rajendra Kumar R.T. Hasna Abdul Salam Department of Biotechnology Dr.N.G.P. Arts and Science College Coimbatore 641048 Tamil Nadu India Advanced materials and Devices Laboratory Department of Physics Bharathiar University Coimbatore 641046 Tamil Nadu India Department of Biotechnology School of Life Sciences Karpagam University Coimbatore 641021 Tamil Nadu India

Photocatalytic degradation of Bisphenol A （BPA）, a representative endocrine disruptor chemical, was carried out under irradiation of sunlight in the presence of CexZn1-xO nanophotocatalyst. Cerium （Ce） ions were successfully incorporated into the bulk lattice of ZnO by simple co-precipitation process. The CexZn1-xO composite nanostructures exhibited higher photocatalytic efficiency than pure ZnO in the degradation of BPA under sunlight irradiation and nearly complete mineralization of BPA was achieved. The degradation rate was strongly dependent on factors such as the size and structure of catalyst, doping material concentration, BPA concentration, catalyst load, irradiation time and pH levels. This work suggested that the CexZn1-xO assisted photocatalytic degradation is a versatile, economic, environmentally benign and efficient method for BPA removal in the aqueous environment.

关键词： Bisphenol A (BPA) ZnO CexZn1-xO Sunlight Co-precipitation Cerium

Larvicidal potential of selected indigenous lichens against three mosquito species–Culex quinquefasciatus, Aedes aegypti and Anopheles stephensi

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Chinese Herbal medicines 2018年第2期10卷 152-156页

作者： Syed Zameer Ahmed Khader Sidhra Syed Zameer Ahmed Kisore Perundurai Venkatesh kamaraj Chinnaperumal Sanjeeva Nayaka Department of Biotechnology K.S.Rangasamy College of Technology Department of Biotechnology Periyar University Indian Lichenological Society Lichenology Laboratory Plant Diversity Systematics and Herbarium Division CSIR-National Botanical Research Institute (Govt. of India)

Objective：mosquitoes are the major transmitting vectors of serious human diseases,causing millions of deaths every year with undesirable effects,including toxicity to non-target *** plants with insecticidal properties have been used in recent years for the control of a variety of pest insects and *** the quest for alternative natural biological control agents against mosquito larvae lichens were ***：Larvicidal activity was assessed with methanolic extracts of Parmotrema reticulatum,Parmotrema kamatti,Parmotrema tinctorum,Parmelia erumpens,Leptogium papilosum,and Roccella montagnei against Aedes aegypti,Anopheles stephensi,and Culex *** standard WHO protocols with minor modifications were adopted and the bioassay was evaluated at the concentrations of 100–500μg/m L for each *** all the lichen extracts showed complete mortality against *** in100μg/m L,the concentrations were decreased to 100,50,25,12.5,and 6.25μg/m L for *** mortality was observed for 24 h after ***：All the lichen extracts exhibited activity against third instar larvae of *** and *** at 100μg/m L,and 100%mortality was observed against the vector *** at 100μg/m *** highest larvicidal activity was found with *** against ***（81.127μg/m L）and ***（89.10μg/m L）.Similarly,*** and *** when tested against *** with minimum concentration〈100μg/m L exhibited significant activity withof 5.32and 6.97μg/m ***：The bioassay results revealed larvicidal potential of lichens especially against *** with high mortality even at lower ***,lichens can be used as an ideal sustainable approach for the control of lymphatic filariasis caused by vector ***.

关键词： larvicidal lichen mortality mosquito vectors

Effect of angiotensin converting enzyme gene I/D polymorphism in South Indian children with nephrotic syndrome

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The Journal of Biomedical Research 2019年第3期33卷 201-207页

作者： Aravind Selvin Kumar Ramanathan Balakrishnan Karuppiah murali Vijayan kamaraj Raju Dhivakar mani Rathika Chinniah manikandan Thirunavukkarasu Padma malini Ravi Jeyaram Illiayaraja Krishnan Prabha Senguttuvan Department of Pediatric Nephrology Institute of Child Health and Hospital for Children Department of medical Genetics The Tamil Nadu Dr.M.G.R.Medical University Department of Immunology School of Biological SciencesMadurai Kamaraj University Department of Biotechnology and Genetic Engineering Bharathidasan University Department of Clinical Research Narayana Health City Department of Pediatric Nephrology Dr.Mehta’s Children’s Hospital

Nephrotic syndrome is one of the most common childhood kidney diseases. It is mostly found in the age group of 2 to 8 years. Around 10%-15% of nephrotic syndrome cases are non-responders of steroid treatment(SRNS).Angiotensin converting enzyme(ACE)(I/D) gene association studies are important for detecting kidney disease and herein we assessed the association of ACE(I/D) polymorphism with nephrotic syndrome in South Indian children. We recruited 260 nephrotic syndrome(162 boys and 98 girls) and 218(140 boys and 78 girls) control subjects. ACE I/D polymorphism was analyzed by PCR using genotype allele specific primers. In ACE(I/D), we did not find significant association for the ungrouped data of nephrotic syndrome children and the control subjects. Kidney biopsies were done in 86 nephrotic syndrome cases(minimal change disease, n = 51;focal segmental glomerulosclerosis, n = 27;diffuse mesangial proliferation, n = 8). We segregated them into the minimal change disease/focal segmental glomerulosclerosis groups and observed that the ACE’D’ allele was identified with borderline significance in cases of focal segmental glomerulosclerosis and the ’Ⅰ’ allele was assessed as having very weak association in cases of minimal change disease. ’Ⅱ’ genotype was weakly associated with minimal change disease. Gender specific analysis revealed weak association of’ID’ genotype with female nephrotic syndrome in females. Dominant expression of DD genotype was observed in males with nephrotic syndrome. Our finding indicated that ACE(I/D) has moderate association with focal segmental glomerulosclerosis. However, due to the limited number of biopsy proven focal segmental glomerulosclerosis subjects enrolled, further studies are required to confirm these results.

关键词： angiotensin converting enzyme focal segmental glomerulosclerosis minimal change disease nephrotic syndrome

Biosynthesis of silver nanoparticles by using mangrove plant extract and their potential mosquito larvicidal property

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Asian Pacific Journal of Tropical medicine 2011年第10期4卷 799-803页

作者： m Gnanadesigan m Anand S Ravikumar m maruthupandy V Vijayakumar S Selvam m Dhineshkumar AK Kumaraguru School of Energy Environmental and Natural ResourcesDepartment of Marine and Coastal StudiesMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi-623409Ramanathapuram DistrictTamil NaduIndia School of Chemistry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of Chemistry Department of Industrial ChemistryAlagappa UniversityKaraikudi-630003Tamil NaduIndia

Objective:To identify the larvicidal activities of silver nano particles synthesised with Rhizophora mucronata（***） leaf extract against the larvae of Aedes aegypti（***） and Culex quinquefasciatus（***）.methods:In vitro larvicidal activities such as LC50 and LC90 were assessed for the *** and *** larval ***, characterisation such as UV,XRD,FTIR and AFm analysis were carried out for the synthesised silver nano ***:The LC50 value of the synthesised silver nano particle was identified as 0.585 and 0.891 mgg/L for *** and *** larvae respectively. Further,the LG90 values are also identified as 2.615 and 6.291 mg/L for *** and Cx. quinquefasciatus species *** synthesised silver nanoparticles have maximum absorption at 420 nm with the average size of 60-95 *** XRD data showed 20 intense values with various degrees such as 37.10°,47.66°,63.97°and 70.01°.The FTIR data showed prominent peaks in（3 426.89,2 925.49,2 869.56,2 346.95,1 631.49,1 031.73,669.18 and 455.12） different ***:The biosynthesis of silver nanoparticles with leaf aqueous extract of R. mucronata provides potential source for the larvicidal activity against mosquito borne diseases.

关键词： Biosynthesis mangroves Larvicidal

Effect of imidazole based polymer blend electrolytes for dye-sensitized solar cells in energy harvesting window glass applications

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2807-2814页

作者： K.m.manikandan A.Yelilarasi S.S.Saravanakumar P.Senthamaraikannan Anish Khan Abdullah m.Asiri Department of Physics Kamaraj College of Engineering and TechnologyK.VellakulamVirudhunagar625701 MaduraiTamil NaduIndia Department of mechanical Engineering Kamaraj College of Engineering and TechnologyK.VellakulamVirudhunagar625701 MaduraiTamil NaduIndia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Center of Excellence for Advanced materials Research King Abdulaziz UniversityJeddah 21589P.O.Box 80203Saudi Arabia

The exploration of polymer electrolyte in the field of dye sensitized solar cell(DSSC) can contribute to increase the invention of renewable energy applications. In the present work, the influence of imidazole on the poly(vinylidene fluoride)(PVDF)–poly(methyl methacrylate)(PmmA)–Ethylene carbonate(EC)–KI–I2 polymer blend electrolytes has been evaluated. The different weight percentages of imidazole added into polymer blend electrolytes have been prepared by solution casting. The prepared films were characterized by Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), thermogravimetric analysis(TGA), UV–visible spectra, photoluminescence spectra and impedance spectroscopy. The surface roughness texture of the film was analyzed by atomic force microscopy(AFm). The ionic conductivity of the optimized polymer blend electrolyte was determined by impedance measurement, which is 1.95 × 10-3 S·cm-1 at room temperature. The polymer electrolyte containing 40 wt% of imidazole content exhibits the highest photo-conversion efficiency of 3.04%under the illumination of 100 m W·cm-2. moreover, a considerable enhancement in the stability of the DSSC device was demonstrated.

关键词： Polymer blend electrolyte Imidazole Dye-sensitized solar cell Surface roughness Ionic conductivity

Phylogenetic analysis and protective effects of thymol and its chromatographic fractions from a novel wild mushroom in combating oxidative stress

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Food Science and Human Wellness 2021年第4期10卷 452-459页

作者： m.Subbulakshmi Sugapriya Dhanasekaran S.Abirami m.Kannan R.Palaniappan Divya Venugopal Department of microbiology K.R.College of Arts and ScienceKovilpattiTamil NaduIndia Department of medical Laboratory Sciences College of Applied Medical SciencesPrince Sattam Bin Abdulaziz UniversityWadi Al DawaserSaudi Arabia Department of microbiology Kamaraj CollegeThoothukudiTamil NaduIndia Research Department of Zoology V.H.N.Senthikumara Nadar College(Autonomus)VirudhunagarTamil NaduIndia Research Department of Computer Science V.H.N.Senthikumara Nadar College(Autonomus)VirudhunagarTamil NaduIndia

mushrooms are good sources of phytochemicals that have antioxidant and anti-proliferative *** study identifi ed a unique isoform of 18S rRNA gene(864 bp)from a novel wild mushroom(SmK-1)(GenBank accession number:SUB3267363).Thin layer chromatographic(TLC)profiling of the methanolic extract of the dried mushroom fruiting bodies of SmK-1 revealed the presence of phenolic and fl avonoid fractions with retention factor(Rf)values of 0.955 and 0.927 *** GC/mS chromatograms of the SmK-1 methanolic extract identifi ed the main bioactive compound was phenol,5-methyl-2-(1-methylethyl)(74.00%)(thymol).The radical scavenging activity for the fl avonoid fraction was greater than the phenolic fractions(Rf–phenolics fractions>Rf–fl avonoid fractions)with the antioxidant activity more than that of standard ascorbic ***,the phenolic and flavonoid fractions of SmK-1 expressed cytotoxic effects in HeLa cells with IC50 values ranging from 5μg/mL to 80μg/mL in a dose-dependent *** present research highlights the presence of high thymol concentration in a novel wild mushroom that has antioxidant and anti-poliferative potential with therapeutic benefi *** application of thymol natural products from novel mushroom SmK-1 as nutrition supplements could inhibit oxidative stress triggered by numerous pathologies that may pave the way to develop a new therapeutic natural drug.

关键词： Antioxidant Anti-proliferation Dietary mushrooms HeLa cells Novel mushrooms Thymol

Fabrication and characterization of Ti6A14V/TiB2-TiC composites by powder metallurgy method

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Rare metals 2017年第10期36卷 806-811页

作者： m. Anandajothi S. Ramanathan V. Ananthi P. Narayanasamy Department of manufacturing Engineering Annamalai University Chidambaram Tamil Nadu 608 002 India Physics Section Faculty of Engineering and Technology Annamalai University Chidambaram Tamil Nadu 608 002 India Department of mechanical Engineering Kamaraj College of Engineering and Technology Virudhunagar Tamil Nadu 626 001 India

Titanium matrix （Ti6Al4V） composites rein- forced with TiB2 and TiC were produced through powder metallurgy method. The effect of addition of both TiB2 and TiC with different contents （2.5 wt%, 5.0 wt% and 7.5 wt%） on the density, microstructure and hardness properties of titanium matrix was investigated. The size distributions of the matrix alloy and reinforcement particles were measured by particle size analyzer. microhardness of the sintered composites was evaluated using Vickers＇s hardness tester with a normal load of 3 N and a dwell time of 10 s. Ti6Al4V alloy and Ti6Al4V/TiB2-TiC composites were characterized through X-ray diffraction （XRD） and field emission scanning electron microscope （FESEm） equipped with energy-dispersive spectrometer （EDS）. The addition of TiB2 and TiC particles enriches the properties of Ti6Al4V alloy. The sintered Ti6Al4V/TiB2-TiC composite features a dense and pore-free microstructure with varying TiB2 and TiC particle distribution in the metal matrix. The results of this study show that the development of new phases plays a significant role in the properties of these composite materials.

关键词： Ti6Al4V TiB2 TiC microstructure

In vitro antiplasmodial activity of methanolic extracts from seaweeds of South West Coast of India

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Asian Pacific Journal of Tropical medicine 2011年第11期4卷 862-865页

作者： S Ravikumar G Ramanathan m Gnanadesigan A Ramu V Vijayakumar School of marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi - 623 409Ramanathapuram DistrictTamil NaduIndia Department of microbiology V.H.S.N.College.Virudhunagar DistrictTamil NaduIndia School of Chemistry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai DistrictTamil NaduIndia

Objective:To identify the in vitro antiplasmodial activity of seaweed plants against Plasmodium falciparum ***:A total of eight seaweeds were collecled from Kanvakumari district,Tainilnadu,*** in vitro antiplasmodial activity was performed in 96 well plates against Plasmodium falciparum,and preliminary phytochemcial analysis were performed for the ***:Of the selected plants Enteromorpha intestinalis（2.61%） showed maximum percentage of *** minimum concentration of inhibitory(IC50) value was observed with Chaetomorpha antennina[（26.37±4.14）μg/ml.]further,the positive controls such as chloroquine and artemether showed antiplasmodial activities(IC50) with（19.10±5.93） and（6.03±0.21）μg/mL concentrations,*** preliminary phytochemical analysis of the seaweed extracts showed a variety of phytochemical constituents such as carboxylic acids,phenols,protein, resins,steroids and ***:The antiplasmodial activity of the seaweed extract might due to the presence of sugars and phenolic *** the present findings,it is concluded that,the seaweed extract of Chaetomorpha antennina can be further used as a putative antiplasmodial drugs in near future.

关键词： Antiplasmodial activity IC50 Phytochemical Seaweeds Plasmodium falciparum