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RISS 인기검색어
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- 저자 : Nagarathinam, Mangayarkarasi (검색결과 3 건)
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Mechanochemical reactions of coordination polymers by grinding with KBr
Nagarathinam, Mangayarkarasi,Chanthapally, Anjana,Lapidus, Saul H.,Stephens, Peter W.,Vittal, Jagadese J. The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.20
<P>Grinding of a one-dimensional (1-D) ladder coordination polymer (CP), [Zn(μ-CH<SUB>3</SUB>CO<SUB>2</SUB>)(CF<SUB>3</SUB>CO<SUB>2</SUB>)bpe] (<B>1</B>), and a hydrogen-bonded 1-D CP, [Cd(CH<SUB>3</SUB>CO<SUB>2</SUB>)<SUB>2</SUB>bpe(H<SUB>2</SUB>O)] (<B>2</B>), with KBr resulted in the exchange of carboxylate by bromide ions and the formation of 1-D zigzag and 2-D CPs respectively.</P> <P>Graphic Abstract</P><P>When two different one-dimensional (1-D) coordination polymers are ground with KBr, ligand exchange takes place to furnish new 1-D and 2-D coordination polymers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc17358a'> </P>
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Shahul Hameed, A.,Nagarathinam, Mangayarkarasi,Reddy, M. V.,Chowdari, B. V. R.,Vittal, Jagadese J. The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.15
<P>The layer structured α<SUB>I</SUB>-LiVOPO<SUB>4</SUB> was obtained <I>via</I> a two step chemical synthesis. In the first step, a hydrated phase, LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O, was obtained by a simple hydrothermal route at 120 °C. Single crystal X-ray diffraction analysis revealed the structure of LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O to be orthorhombic with lattice parameters: <I>a</I> = 8.9454(7) Å, <I>b</I> = 9.0406(7) Å and <I>c</I> = 12.7373(10) Å. Dehydration of the parent compound led to its structural transformation to tetragonal α<SUB>I</SUB>-LiVOPO<SUB>4</SUB>, which was only identified previously during the lithium insertion in VOPO<SUB>4</SUB>. We have investigated the solid-state dehydration of LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O and proposed a possible mechanism for the crystal structure transformation. Electrochemical characterization of this rarely studied tetragonal phase revealed its good lithium cycling at high operating voltage. Galvanostatic charge–discharge cycling of α<SUB>I</SUB>-LiVOPO<SUB>4</SUB> was studied in a voltage window of 2.5–4.5 V, which shows a stable reversible capacity of 103(±3) mA h g<SUP>−1</SUP> at a current density of 16 mA g<SUP>−1</SUP> (0.1 C). At higher current rates, although it exhibited good cyclability, the capacity was found to decrease with increasing current rates. The long term cycling stability of the above material was demonstrated at a current rate of 0.5 C up to 200 cycles.</P> <P>Graphic Abstract</P><P>Highly reversible lithium insertion and extraction with a good capacity are observed for the rarely studied α<SUB>I</SUB>-LiVOPO<SUB>4</SUB> which was obtained by the thermal dehydration of LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm00062h'> </P>
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Chavan Priyanka Yashwant,Vijay Rajendran,Srinivasan Krishnamoorthy,Baskaran Nagarathinam,Ashish Rawson,Arunkumar Anandharaj,Vignesh Sivanandham 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.6
The present study evaluated antibiotic resistance (ABR) in bacteria isolated from different food wastes viz., meat slaughterhouses, dairy and restaurants. About 120 strains isolated from the food waste were subjected to ABR screening. More than 50% of all the strains were resistant to Vancomycin, Neomycin and Methicilin, which belong to third-generation antibiotics. Two lactic acid bacteria (LAB) free of ABR were chosen to be used as starter cultures in media formulated from food waste. Food waste combination (FWC-4) was found to be on par with the nutrient broth in biomass production. The non-ABR LAB strains showed excellent probiotic properties, and in the fed-batch fermentation process, adding a nitrogen source (soya protein) enhanced the microbial biomass (3.7 g/l). Additionally, exopolysaccharide production was found to be 2.3 g/l. This study highlights the ABR incidence in food waste medium and its economic advantage for starter culture biomass production.
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