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Evaluation of antibacterial potential of seaweeds occurring along the coast of Mandapam,India against human pathogenic bacteria

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Journal of Coastal Life Medicine 2014年第3期 196-202页

作者： Gopalraj Karthikai Devi karunamoorthy manivannan Perumal Anantharaman Department of Zoology D.G.G.Arts College for WomenMayiladuthuraiTamil Nadu-609001India Division of Microbial Biodiversity and Bioenergy Department of MicrobiologyBharathidasan UniversityTiruchirapalliTamilnadu-620024India Centre of Advanced Study in Marine Biology Faculty of Marine SciencesAnnamalai UniversityParangipettaiTamilnadu–608502India

Objective:To investigate the antibacterial activity of six seaweeds against twelve human bacterial pathogens using seven different ***:Antibacterial activity was evaluated using the disc diffusion technique on Mueller Hinton *** dilution assays are standard method used to compare the inhibition efficiency of the antimicrobial ***:Among the six seaweeds tested,the antibacterial activity was higher in the brown seaweeds when compared to red and green *** gymnospora was found exerting a strong antibacterial activity with a high range inhibition[(6.00±0.82)to(22.67±1.25)mm].Broth dilution assay was conducted against Salmonella *** the chloroform extract of Padina gymnospora and the growth inhibition was found in the range of 74.26%to 82.56%.Conclusions:Further research studies are being carried out on other species of seaweeds of different habitats in order to provide complete data of the antimicrobial potential of these *** is also essential to study the principle compound present in the seaweeds which is responsible for antimicrobial *** can be achieved by using advanced separation techniques.

关键词： Antibacterial Seaweeds Mandapam Human pathogenic bacterium Different extracts

A novel n-CeO2/n-CdO heterojunction nanocomposite for enhanced photodegradation of organic pollutants under visible light irradiation

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Journal of Rare Earths 2019年第8期37卷 853-860,I0003页

作者： karunamoorthy Saravanakumar Subramani Muthupoongodi Velluchamy Muthuraj Department of Chemistry V.H.N.S.N CollegeVirudhunagar626 001TamilnaduIndia Department of Chemistry Sri Kaliswari CollegeSivakasi626 130TamilnaduIndia Department of Chemistry Thiagarajar CollegeMadurai625 009TamilnaduIndia

In this study,a series of novel visible light driven n-CeO2/n-CdO heterojunction(CeO2/CdO)nanoco mposites we re successfully fabricated by simple ultrasonication *** characte rization tools including X-ray diffraction(XRD),scanning electro n microscopy(SEM),transmission electron microscopy(TEM)and UV-vis diffuse reflectance spectroscopy(UV-DRS),etc.,were utilized to investigate the physicochemical properties of the catalyst and confirm the formation of *** visible light irradiations,the photocatalytic activities of the as-prepared CeO2/CdO nanocomposites were evaluated by degrading of Congo red(CR)and Rhodamine B(RhB)*** a result,the CeO2/CdO(mass percentage ratio 1:3)nanocomposite displays remarkable performance for CR and RhB *** enhancement in the photocatalytic performance of CeO2/CdO(1:3)nanocomposite can be attributed not only to the strong visible-light absorption region,separating the photogenerated electronhole pairs but also to the formation of n-n type *** results also indicate that the CeO2/CdO(1:3)nanocomposite has good stabilization and high *** addition,the mechanism is proposed for the coupled semiconductors and possible reasons for the enhancement of visible-light photocatalytic efficiency are also *** work can provide a new gateway to fabricate visible photocatalysts and promising candidate catalysts for poisonous wastewater treatment in the near future.

关键词： n-CeO2/n-CdO Heterojunction Visible light Photocatalysis Photodegradation Rare earths

Parametric Optimization to Minimise the Surface Roughness on the Machining of GFRP Composites

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Journal of Materials Science & Technology 2006年第1期22卷 66-72页

作者： K.Palanikumar L.karunamoorthy R.Karthikeyan Department of Mechanical & Production Engineering Sathyabama Institute of Science & TechnologyDeemed UniversityChennai-119TamilnaduIndia Department of Mechanical Engineering College of EngineeringAnna UniversityChennai-25TamilnaduIndia Department of Manufacturing Engineering Annamalai UniversityChidambaramIndia

The present investigation focuses on the parametric influence of machining parameters on the surface finish obtained in turning of glass fiber reinforced polymer （GFRP） composites. The experiments were conducted based on Taguchi＇s experimental design technique. Response surface methodology and analysis of variance （ANOVA） were used to evaluate the composite machining process to perform the optimization. The results revealed that the feed rate was main influencing parameter on the surface roughness. The surface roughness increased with increasing the feed rate but decreased with increasing the cutting speed. Among the other parameters, depth of cut was more insensitive. The predicted values and measured values were fairly close to each other, which indicates that the developed model can be effectively used to predict the surface roughness on the machining of GFRP composites with 95% confidence intervals. Using such model could remarkablely save the time and cost.

关键词： Orthogonal arrays GFRP composites Surface finish Response surface method Optimization

Optimizing the Machining Parameters for Minimum Surface Roughness in Turning of GFRP Composites Using Design of Experiments

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Journal of Materials Science & Technology 2004年第4期20卷 373-378页

作者： K.Palanikumar L.karunamoorthy R.Karthikeyan Department of Mechanical & Production Engineering Sathyabama Institute of Science & Technology Deemed University Chennai-119 IndiaDepartment of Mechanical Engineering College of Engineering Anna University Chennai-25 IndiaDepartment of Manufacturing Engineering Annamalai University Chidambaram-608 001 India

In recent years, glass fiber reinforced plastics (GFRP) are being extensively used in variety of engineering applications in many different fields such as aerospace, oil, gas and process industries. However, the users of FRP are facing difficulties to machine it, because of fiber delamination, fiber pull out, short tool life, matrix debonding, burning and formation of powder like chips. The present investigation focuses on the optimization of machining parameters for surface roughness of glass fiber reinforced plastics (GFRP) using design of experiments (DoE). The machining parameters considered were speed, feed, depth of cut and workpiece (fiber orientation). An attempt was made to analyse the influence of factors and their interactions during machining. The results of the present study gives the optimal combination of machining parameters and this will help to improve the machining requirements of GFRP composites.

关键词： Optimization Turning GFRP composites Surface roughness

Photocatalytic degradation of environmental perilous gentian violet dye using leucaena-mediated zinc oxide nanoparticle and its anticancer activity

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Rare Metals 2019年第4期38卷 277-286页

作者： Krishnaswamy Kanagamani Pitchaipillai Muthukrishnan karunamoorthy Saravanakumar Karikalan Shankar Ayyasami Kathiresan Department of Chemistry SNS College of Technology Coimbatore 641035India Department of Chemistry Faculty of Engineering Karpagam Academy of Higher Education Coimbatore 641021 India Department of Chemistry VHNSN College Virudhunagar 626001 India

Phytomediated synthesis of metal oxide nanoparticles has become a key research area in nanotechnology due to its wide applicability in various biomedical fields. The present work explores the biosynthesis of zinc oxide nanoparticles（ZnO-NPs） using Leucaena leucocephala leaf extract. The synthesised ZnO-NPs were characterised by ultraviolet-visible（UV-Vis） spectroscopy, scanning electron microscopy（SEM）, energydispersive X-ray spectroscopy（EDX）, Fourier transform infrared spectroscopy（FTIR）, X-ray diffraction（XRD）,transmission electron microscopy（TEM） and selected area electron diffraction（SAED） studies. Biosynthesised ZnONPs are found to have wurtzite hexagonal structure with particles distributed in the range of 50-200 nm as confirmed by TEM studies. The anticancer activity of ZnONPs against MCF-7（breast cancer） and PC-3（human prostate cancer） cell lines was evaluated using 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide（MTT） assay. From the assay, biosynthesised ZnO-NPs have better cytotoxic activity on PC-3 cell lines than MCF-7 cell lines. The in vitro cytotoxicity studies of biosynthesised ZnO-NPs against Dalton lymphoma ascites（DLA）cells reveal better antitumor activity of 92% inhibition with concentration of 200 μg·ml-1 of ZnO-NPs,and as the concentration increases, the anticancer efficiency as well increases, and also, it has excellent photocatalytic activity to degrade crystal violet dye in aqueous solution after irradiation of 90 min. The result suggests that the green synthesis of ZnO-NPs could be easily recovered and reused several times without any significant loss of the catalytic activity. The advantage of this technique lies in its low cost, easily climb able and non-use of toxic agents.

关键词： Nanostructured materials Catalysis Scanning electron microscopy X-ray diffraction