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Muthukumarasamy, R.,Kang, U.G.,Park, K.D.,Jeon, W.-T.,Park, C.Y.,Cho, Y.S.,Kwon, S.-W.,Song, J.,Roh, D.-H.,Revathi, G. Blackwell Publishing Ltd 2007 Journal of applied microbiology Vol.102 No.4
<P>Abstract</P><P>Aim: </P><P>This study has been aimed (i) to isolate and identify diazotrophs from Korean rice varieties; (ii) to examine the long-term effect of N and compost on the population dynamics of diazotrophs and (iii) to realize the shot-term inoculation effect of these diazotrophs on rice seedlings.</P><P>Methods and Results: </P><P>Diazotrophic and heterotrophic bacterial numbers were enumerated by most probable number method and the isolates were identified based on morphological, physiological, biochemical and 16s rDNA sequence analysis. Long-term application of fertilizer N with compost enhanced both these numbers in rice plants and its environment. Bacteria were high in numbers when malate and azelaic acids were used as carbon source, but less when sucrose was used as a carbon substrate. The combined application promoted the association of diazotrophic bacteria like <I>Azospirillum</I> spp., <I>Herbaspirillum</I> spp., <I>Burkholderia</I> spp., <I>Gluconacetobacter diazotrophicus</I> and <I>Pseudomonas</I> spp. in wetland rice plants. Detection of <I>nif</I>D genes from different diazotrophic isolates indicated their nitrogen fixing ability. Inoculation of a representative isolate from each group onto rice seedlings of the variety IR 36 grown in test tubes indicated the positive effect of these diazotrophs on the growth of rice seedlings though the percentage of N present in the plants did not differ much.</P><P>Conclusions: </P><P>Application of compost with fertilizer N promoted the diazotrophic and heterotrophic bacterial numbers and their association with wetland rice and its environment. Compost application in high N fertilized fields would avert the reduction of N<SUB>2</SUB>-fixing bacterial numbers and their association was beneficial to the growth of rice plants.</P><P>Significance and Impact of the Study: </P><P>The inhibitory effect of high N fertilization on diazotrophic bacterial numbers could be reduced by the application of compost and this observation would encourage more usage of organic manure. This study has also thrown light on the wider geographic distribution of <I>G. diazotrophicus</I> with wetland rice in temperate region where sugarcane (from which this bacterium was first reported to be associating and thereon from other plant species) is not cultivated.</P>
벼에서 분리한 질소고정 Gluconacetobacter diazotrophicus 와 신규 Acetobacteria 의 접종효과
( R Muthukumarasamy ),( G Revathi ),( M Govindarajan ),( P Longanathan ),김위금 ( Ui Gum Kang ),박기도 ( Ki Do Park ),박창영 ( Chang Young Park ),전원태 ( Weon Tae Jeon ),조영소 ( Young Son Cho ),이동옥 ( Dong Wook Lee 한국토양비료학회 2002 한국토양비료학회 학술발표회 Vol.2002 No.1
Synthesis of garland like ZnO nanorods and their application in dye sensitized solar cells
Thambidurai, M.,Muthukumarasamy, N.,Velauthapillai, D.,Lee, C. North-Holland 2013 Materials letters Vol.92 No.-
Garland like ZnO nanorods have been synthesized by the chemical bath deposition method. Dye sensitized solar cells have been assembled by using natural dye extracted from hibiscus rosasinensis as sensitizer in garland like ZnO nanorod films. X-ray diffraction result shows that garland like ZnO nanorods exhibit hexagonal structure. The ZnO nanorods have an average diameter of 100nm and the length of the nanorods is 2μm. The efficiency of the fabricated dye sensitized garland like ZnO nanorod based solar cell is 0.67%.
Boby Ignatius,Muthukumarasamy Srinivasan,Srinivasan Balakrishnan 한국해양과학기술원 2011 Ocean science journal Vol.46 No.3
The sandbird octopus Amphioctopus aegina (Gray,1849) is one of the important octopod species in trawl catches in Mandapam waters (Palk Bay). The reproductive biology of this species from these waters was studied from October 2001to September 2002. In the majority of months(Jan-June), the sex ratio was biased towards males. The ratios of males to females increased consistently with respect to weight Total weight at first maturity were 78.78g for females and 40.8 g for males. Four maturity stags were recognized for females and two for males. Maturation and spawning occur all year round, with a peak during October and another peak during January-February. In males, no definite seasonal changes were observed in gonadosomatic index (GSI) values. In females there were two peaks in GSI values during October and January-February. For individuals of a DML range of 67-85 mm fecundity varied between 2,962-8,820 oocytes. The average relative fecundity was estimated at 68 to 83 and the average number oocytes per gram of ovary were 488 to 539.
Ganesan Arun,Muthukumarasamy Eyini,Paramasamy Gunasekaran 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.6
Silver nanoparticles, which are small metalliccolloidal particles, ranging 1 ~ 100 nm in size, have severalnano biotechnological applications in medicine, manufacturingand engineering industries. Fungus-mediated synthesis ofsilver nanoparticles is an ecofriendly, green process. Further,extracellular enzymes and proteins elaborated by fungi areinvolved in the synthesis of the silver nanoparticle, whichmakes the downstream processing relatively simpler. In thepresent investigation, Schizophyllum commune, a mushroomfungus, was tested for its ability to synthesize extracellularas well as intracellular silver nanoparticles. When thefungus was challenged with 1 mM silver nitrate, a changein colour of the broth and the mycelium was observed,indicative of extracellular and intracellular synthesis ofsilver nanoparticles. The presence of silver nanoparticleswas confirmed by studying its Surface Plasmon Resonanceabsorption band in the visible wavelength. FTIR spectrumanalysis of the silver nanoparticles indicated the presenceof biomolecules in association with the reduction of silverions. Scanning Electron Microscopic analysis of the silvernanoparticles revealed the nanorange dimensions of boththe extracellular and the intracellular silver nanoparticles. Analysis of biological activities of the silver nanoparticlesdisclosed their significant antibacterial activity againstEscherichia coli, Bacillus subtilis, Klebsiella pneumoniaeand Pseudomonas fluorescens. Additionally, the silvernanoparticles inhibited the growth of the dermatophyticfungal pathogens viz. Trichophyton simii, Trichophytonmentagrophytes and Trichophyton rubrum significantly. Anticancer activity of silver nanoparticles, assayed throughMTT cytotoxicity assay, uncovered that 27.2 and 64%mortality could be obtained in Human Epidermoid LarynxCarcinoma (HEP -2) cell lines at concentrations between10 and 100 μg/mL, respectively. The results obtained indicatethat Schizophyllum commune is capable of synthesizingsilver nanoparticles in shaken broth cultures (120 rpm) at25 ± 2°C and pH 7.
Solution-based synthesis of high yield CZTS (Cu<sub>2</sub>ZnSnS<sub>4</sub>) spherical quantum dots
Rajesh, G.,Muthukumarasamy, N.,Subramanian, E.P.,Venkatraman, M.R.,Agilan, S.,Ragavendran, V.,Thambidurai, M.,Velumani, S.,Yi, J.,Velauthapillai, D. Academic Press 2015 Superlattices and microstructures Vol.77 No.-
High yield CZTS quantum dots have been synthesized using simple precursors by chemical precipitation technique. Formation mechanism of CZTS spherical quantum dots also has been investigated. According to the mechanism, copper sulfide nuclei firstly forms, and serves as the starting point for the nucleation and growth of CZTS. X-ray diffraction pattern, X-ray photoelectron spectra (XPS) and Raman spectra reveals the formation of pure kesterite structure Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> nanoparticles. HRTEM analysis reveals the formation of CZTS quantum dots with an average particle size of ~8.3nm. The elemental distribution of CZTS quantum dots studied using STEM elemental mapping reveals that Cu, Zn, Sn and S are present in the sample. The photoluminescence spectra of CZTS exhibit a broad red emission band at 657nm. The optical band gap is shifted to the higher energy side and it shows the presence of quantum confinement effect.
Senthil, T.S.,Muthukumarasamy, N.,Kang, Misook Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
Dye sensitized solar cells were fabricated using natural dyes extracted from beetroot, rose and strawberry. The ZnO nanorod working electrode has been prepared by simple hydrothermal method. The crystallinity and morphology of the prepared electrode has been studied using X-ray diffraction and scanning electron microscopy techniques. The effect of natural dye extract temperature, pH of the dye and the solvent used for dye preparation on the solar cell characteristics have been studied. The efficiency of strawberry extract sensitized ZnO nanorod solar cells are found to be better than the other solar cells sensitized using beetroot and rose extracts.