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RETRACTED: Marine actinobacterial metabolites: Current status and future perspectives
Manivasagan, P.,Venkatesan, J.,Sivakumar, K.,Kim, S.K. G. Fischer 2013 Microbiological research Vol.168 No.6
This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor. Authors and Editor agreed to retract this article because substantial parts of the text were copied from the following sources without proper attribution: Lam, K.S. (2006), Discovery of novel metabolites from marine actinomycetes. Current Opinion in Microbiology 9(3), pp. 245-251; Subramani, R., Aalbersberg, W. (2012), Marine actinomycetes: An ongoing source of novel bioactive metabolites. Microbiological Research 167(10), pp. 571-580; Dharmaraj, S. (2010), Marine Streptomyces as a novel source of bioactive substances. World Journal of Microbiology and Biotechnology 26(12), pp. 2123-2139. The authors apologize for this oversight and any inconvenience caused.
S. Kalaivani,K. Sivakumar,J. Vijayarangam 한국전산응용수학회 2022 Journal of applied mathematics & informatics Vol.40 No.3
Many organizations seek statistical modelling facilitated by data analytics technologies for determining the prediction models associated with M\&A (Merger and Acquisition). By combining these data analytics tool alongside with data collection approaches aids organizations towards M\&A decision making, followed by achieving profitable insights as well. It promotes for better visibility, overall improvements and effective negotiation strategies for post-M\&A integration. This paper explores on the impact of pre and post integration of M\&A in a standard organizational setting via devising a suitable statistical model via employing techniques such as Naïve Bayes, K-nearest neighbour (KNN), and Decision Tree \& Support Vector Machine (SVM).
Yoon, J.,Muhammad, S.,Jang, D.,Sivakumar, N.,Kim, J.,Jang, W.H.,Lee, Y.S.,Park, Y.U.,Kang, K.,Yoon, W.S. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.569 No.-
Monoclinic Li<SUB>3</SUB>V<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3,</SUB> is a highly promising cathode material for lithium-ion rechargeable batteries. It has good ion mobility and high lithium capacity due to its ability to reversibly extract all three lithium ions. Here, we present, a systematic investigation of phase transitions and volume variations that occur during lithium extraction from the carbon-coated monoclinic phase of Li<SUB>3</SUB>V<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> by synchrotron based in situ X-ray diffraction and X-ray absorption spectroscopy. This monoclinic Li<SUB>3</SUB>V<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> illustrates complex behavior of four successive two-phase transitions upon extraction of all three lithium ions between 3.0 and 4.8V vs. Li/Li<SUP>+</SUP>. Each XRD pattern of the intermediate compositions can be fully indexed in the monoclinic space group P2<SUB>1</SUB>/n, with net volume reduction of 6.47%. In situ V K-edge XANES in combination with study of structural parameters is applied to find the vanadium valence state at plateau regions, which highlights the variations in electrochemical potential constraining to extraction of lithium ion from different crystal sites.
EXPLICIT SOLUTIONS OF INFINITE QUADRATIC PROGRAMS
Sivakumar, K.C.,Swarna, J.Mercy 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1
Let H be a Hilbert space, X be a real Banach space, A : H \longrightarrow X be an operator with D(A) dense in H, G: H \longrightarrow H be positive definite, $\chi$ $\in$ D(A) and b $\in$ H. Consider the quadratic programming problem: QP: Minimize $\frac{1}{2}$〈p, $\chi$〉 + 〈$\chi$, G$\chi$〉 subject to A$\chi$= b In this paper, we obtain an explicit solution to the above problem using generalized inverses.
Moore-Penrose inverse in an indefinite inner product space
K. Kamaraj,K. C. Sivakumar 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1-2
The concept of the Moore-Penrose inverse in an indefinite inner product space is introduced. Extensions of some of the formulae in the Euclidean space to an indefinite inner product space are studied. In particular range-hermitianness is completely characterized. Equivalence of a weighted generalized inverse and the Moore-Penrose inverse is proved. Finally, methods of computing the Moore-Penrose inverse are presented.
Biosafe Ginseng: A Novel Source for Human Well-Being
Sivakumar, G.,Yu, K. W.,Paek, K. Y. WILEY-VCH Verlag 2005 Engineering in life sciences Vol.5 No.6
<P>Given the enormous biodiversity in field cultivation, bioengineers were only to look within nature to find new promising phytomolecules or biochemical pathways from plant biofactories. The present review discusses pilot-scale bioreactor cultivation of adventitious roots of ginseng and the enhanced production of pesticide-free bioactive phytomolecules. This biotechnological method is described together with a discussion on economic and biosafety aspects. Besides the “classical” tissue culture as a subject of research on ginseng, new developments and efforts in pilot-scale bioreactor tissue modeling and in the generation of artificial adventitious roots are considered. Additionally, recent progress in the field of medicinal and nutritional roles of adventitious roots produced in a pilot-scale bioreactor are discussed.</P> <B>Graphic Abstract</B> <P>The root of Panax ginseng C. A. Mayer, so-called ginseng, has been widely used as a tonic and highly prized medicine since ancient times. Ginseng has been recognized as a miraculous promoter of health and longevity. Pilot-scale bioreactor cultivation of adventitious roots of ginseng and the enhanced production of pesticide-free bioactive phytomolecules are being reviewed.</P>
Photocatalytic and Antimicrobial Activities of Poly(aniline-co-o-anisidine)/Zinc Oxide Nanocomposite
Sivakumar, K.,Kumar, V. Senthil,Shim, Jae-Jin,Haldorai, Yuvaraj Chemic Publishing Company 2014 Asian Journal of Chemistry Vol.26 No.2
<P>The conjugated poly(aniline-co-o-anisidine)/zinc oxide,[poly(Ani-co-oAs)/ZnO] nanocomposite was prepared by in-situ chemical oxidative polymerization of comonomers with ZnO nanoparticles and :applied as a photocatalyst for the degradation of methylene blue dye. Scanning electron microscopy, transmission electron microscopy:X-ray diffraction, Fourier transform infrared spectroscopy and UV-visible spectroscopy measurements were used to characterize the resulting pure copolymer and nanocomposite. Transmission electron microscopy analysis showed that the nano-particles with amean diameter of 15-25 nm were dispersed in the copolymer matrix. Thermogravimetric analysis indicated that the nanocomposite had a higher decomposition temperature than the pure copolymer. The conductivity measurements showed the resulting nanocomposite possessed higher conductivity as compared to the pure copolymer. The photocatalytic activity results indicated the degradation of methylene blue dye by 97%, over the surface of nanocomposite catalyst under UV-irradiation for 3 h. The nanocomposite exhibited good antimicrobial activity against the microbial species and the dear zone diameter Of the microbial inhibition is correlated to the antimicrobial activity of nanocomposite</P>
Biodiversity of Microalgae and Their Elemental Components from Veeranam Lake, Tamilnadu, India
Sivakumar, K.,Senthilkumar, R. The Korean Society of Limnology 2008 생태와 환경 Vol.37 No.1
An attempt was made in the Veeranam freshwater lake with the objectives to collect, identify, describe and document the algae occurring from March 2007 to August 2007. Qualitative and quantitative characterization of phytoplankton and analysis of physico-chemical parameters of water samples were carried out at monthly intervals during the study period in the western and eastern sides of the lake. It was found that the phytoplankton community embraced 68 genera belonging to four classes viz., Bacillariophyceae (40), Chlorophyceae (22), Cynophyceae (4) and Euglenophyceae (2). There were significant influences of various physico-chemical parameters on the phytoplankton population density. Commonly occurred genera, Oscillatoria (Cyanophyceae), Navicula (Bacillariophyceae) and Scenedesmus (Chlorophyceae), were subjected to energy dispersive spectroscopic analysis (EDS). They were found to accumulate different elements such as Zn, P, S, Ca, Mg, Fe, N, Si, Cl and Mn. Among these the member Cyanophyceae contained Zn, P, Mg, Ca, Mn, S and N. Bacillariophyceae Si, Zn, Mg, Cl, N, Fe, and Ca. Chlorophyceae Ca, Mg, N, Fe, Cl, Zn, Si and Mn. Thus these observations would determine the chemical dialogue between the cell structures and role of the elements. Further, it gives the clue about the phytoplankton growth requirements.