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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
Importance of halide perovskites for next generation solar cells – A review
Kalaiselvi, C.R.,Muthukumarasamy, N.,Velauthapillai, Dhayalan,Kang, Misook,Senthil, T.S. Elsevier 2018 Materials letters Vol.219 No.-
<P><B>Abstract</B></P> <P>Halide perovskites have recently emerged as a promising material for low cost and high efficiency solar cells. Dye Sensitized Solar Cells (DSSCs) are the forerunners of perovskite solar cells. In liquid based dye sensitized solar cell the power conversion efficiency is low and also it had some stability issues. In 2012, a long term stable and high efficiency perovskite solar cell emerged by replacing liquid electrolyte with the solid hole conductor. The attractiveness of organometal halide perovskites are having suitable direct bandgap with large absorption coefficients, low cost and solution based fabrication process. This review summarizes the basic concepts of perovskite, their fabrication and its eminent properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Importance of organic metal halide perovskite presented clearly. </LI> <LI> The basic concepts of perovskite, fabrication and its eminent properties summarized. </LI> <LI> The effect of hole transporting material to achieve remarkable photovoltaic performance was explained. </LI> </UL> </P>
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.