Thiruvarur, India

Central University of Tamil Nadu was established by an Act of Parliament . The University was inaugurated on 30 September 2009 by Kapil Sibal who laid the foundation stone, in the presence of M Karunanidhi and M. K. Stalin. Presently CUTN is functioning in a temporary campus with an area of 55000 sq.ft. in the Thiruvarur District Collectorate. Wikipedia.


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Hemamalini A.,University of Madras | Mohan Das T.,University of Madras | Mohan Das T.,Central University of Tamil Nadu
New Journal of Chemistry | Year: 2013

A series of gel forming symmetrical bis-sugar-triazoles has been developed for the recognition of Hg2+ ions. Preferential interaction of Hg 2+ ions with organogelator based chemosensor 3f led to changes in the morphology as evidenced from FESEM and HRTEM analysis. © 2013 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.


Nithyanandan K.,Pondicherry University | Raja R.V.J.,Central University of Tamil Nadu | Porsezian K.,Pondicherry University
Journal of the Optical Society of America B: Optical Physics | Year: 2013

A theoretical study of modulational instability (MI) in the semiconductor doped dispersion decreasing fiber (SD-DDF) is presented. We consider the combination of saturation of nonlinear response and the dispersion decreasing fiber (DDF). The exact dispersion relation is calculated by means of linear stability analysis. Different fiber systems are considered alongside the proposed SD-DDF for insight and to offer the cutting edge of the proposed model over the others. The two extreme physical effects considered lead to an exciting outcome, where decreasing dispersion leads to broadening the spectral width and saturation, on the other hand, suppresses the MI gain and the bandwidth. A bandwidth relation between different fiber systems is presented, and the idea can open the design of a fiber structure with desired dispersion profile by a suitable manipulation of these effects. We propose that instead of using DDF whose bandwidth is limited by the manufacturing constraints, the use of SDDDF offers better tailoring of the bandwidth profile by suitably altering the saturation parameter. Thus we emphasize that the proposed SD-DDF will be a feature prospect for wide range of applications, especially in the context of ultrashort pulse generation using MI. © 2012 Optical Society of America.


Roopkumar R.,Central University of Tamil Nadu
Optik | Year: 2016

In this paper, we introduce quaternionic fractional Fourier transform of integrable (and square integrable) functions on ℝ and prove that it is satisfying all the expected properties like linearity, inversion formula, Parseval's formula, convolution theorem and product theorem. © 2016 Elsevier GmbH


Gopi D.,Periyar University | Shinyjoy E.,Periyar University | Kavitha L.,Central University of Tamil Nadu
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

The present work is aimed at the synthesis of antibacterial and bioactive silver/magnesium co-substituted hydroxyapatite (Ag/Mg-HAP) powders. For this purpose, firstly, different concentrations (0.5, 1.5, 2.5 wt.%) of silver substituted HAP (Ag-HAP) powders were prepared by ultrasonic irradiation technique and were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). Secondly, magnesium (Mg) is co-substituted as secondary material into Ag-HAP to offset the potential cytotoxicity of Ag, as higher concentration of Ag is toxic. The antibacterial activity of as-synthesized powders was evaluated by Escherichia coli (E. coli) and was found to be effectively high against bacterial colonization. Also, the in vitro cell-material interaction is evaluated with human osteosarcoma MG63 (HOS MG63) cells for cell proliferation. The results showed the evidence of cytotoxic effects of the higher concentration of Ag-HAP characterized by poor cellular viability whereas, Ag/Mg-HAP showed better cell viability indicating that co-substitution of Mg in Ag-HAP effectively offset the negative effects of Ag and improve performance compared with pure HAP. Thus, the as synthesized Ag/Mg-HAP will serve as a better candidate for biomedical applications with good antibacterial property and bone bonding ability. © 2014 Elsevier B.V. All rights reserved.


Nithyanandan K.,Pondicherry University | Raja R.V.J.,Central University of Tamil Nadu | Porsezian K.,Pondicherry University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

Modulational instability (MI) in a twin-core optical fiber with the combined effect of saturation of nonlinearity (SNL) and coupling coefficient dispersion (CCD) is presented. The CCD does not dramatically modify the spectrum of the symmetric or antisymmetric continuous wave (CW) case, but the SNL on the other hand behaves in a perceptible manner such that the gain and the unstable region inherently decrease. In the anomalous dispersion region, the gain of the instability spectrum increases (decreases) monotonously with power (coupling coefficient). The effective nonlinearity and the power threshold for the sustained CW solution becomes a function of power for the SNL case. The so-called nonlinear factor behaves in a unique way such that there exist two powers for the same value of nonlinear factor. The interplay between CCD and SNL is emphasized, where any nonzero value of CCD leads to new instability bands and the saturation on the other hand suppresses the gain of the instability band. We identified a pair of power corresponding to the constant value of the nonlinear factor, where the system becomes invariant, such that the number of instability bands, the gain, and the range of the unstable region are all preserved. In the case of the normal dispersion case, the MI is achieved purely by means of the coupling coefficient. In both cases, a critical CCD is predicted, where the system evolves dramatically in a different manner. © 2013 American Physical Society.


Uthayakumar T.,Pondicherry University | Vasantha Jayakantha Raja R.,Central University of Tamil Nadu | Porsezian K.,Pondicherry University
Optics Communications | Year: 2013

We present the practical design of novel three core photonic crystal fiber (TPCF) for optical switching and logic operations by employing all optical control. To accomplish the proposed aim, we put forth two types of symmetrical TPCF designs, one with cores of planar geometry and the other with equilateral triangular geometry. The dynamics of the individual pulse parameters through the proposed geometries are analyzed numerically using split step Fourier method (SSFM). The steering characteristics of the coupler are demonstrated by the transmission curve. The truth tables expressing Boolean algebra for different logic operations are constructed from the transmission curves of the individual coupler configurations. Out of all configurations, we observe that the chloroform filled triangular core demonstrates all the logic operations namely OR, NOR, AND, NAND, X-OR, X-NOR and NOT with low input power. A figure of merit of logic gates (FOMEL) is also made to compare the performance of all the logic gates. © 2013 Elsevier B.V. All rights reserved.


Nithyanandan K.,Pondicherry University | Raja R.V.J.,Central University of Tamil Nadu | Porsezian K.,Pondicherry University | Kalithasan B.,Chennai Institute of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We investigate the cross-phase-modulation-induced modulational instability (MI) of two co-propagating optical beams in the system of relaxing Kerr nonlinearity with the effect of higher-order dispersion (HOD) and walk-off effect. We identify and discuss the salient features of relaxation of nonlinear responses and HOD using suitable theoretical model. First, we analyzed the impact of HOD and walk-off on the MI spectrum and found both analytically and numerically that the MI exhibits alternate characteristics like the evolution of different spectral bands in addition to the conventional MI bands. The walk-off effects in the virtue of HOD not only consist of the conventional group velocity mismatch (GVM) but also the difference in third-order dispersion (TOD) of the two beams, and thereby significantly modify the dynamical behavior of the MI. We also consider the combined effect of relaxation of nonlinear response and the HOD effects, and we observe that any finite value of delay leads to the evolution of two unstable modes and thereby extends the range of unstable frequency; HOD on the other hand along with the walk-off effect brings other characteristic spectral bands. A detailed discussion about the various combinations of parameters and the relative competence of one over the other on the MI spectrum is presented. Thus the evolution of MI from cross-phase modulation in the system of relaxing Kerr nonlinearity is emphasized in detail and the influence of HOD and the walk-off effect are highlighted. © 2012 American Physical Society.


Dinakar C.,University of Bonn | Dinakar C.,Central University of Tamil Nadu | Bartels D.,University of Bonn
Frontiers in Plant Science | Year: 2013

Most higher plants are unable to survive desiccation to an air-dried state. An exception is a small group of vascular angiosperm plants, termed resurrection plants. They have evolved unique mechanisms of desiccation tolerance and thus can tolerate severe water loss, and mostly adjust their water content with the relative humidity in the environment. Desiccation tolerance is a complex phenomenon and depends on the regulated expression of numerous genes during dehydration and subsequent rehydration. Most of the resurrection plants have a large genome and are difficult to transform which makes them unsuitable for genetic approaches. However, technical advances have made it possible to analyze changes in gene expression on a large-scale. These approaches together with comparative studies with non-desiccation tolerant plants provide novel insights into the molecular processes required for desiccation tolerance and will shed light on identification of orphan genes with unknown functions. Here, we review large-scale recent transcriptomic, proteomic, and metabolomic studies that have been performed in desiccation tolerant plants and discuss how these studies contribute to understanding the molecular basis of desiccation tolerance. © 2013 Dinakar and Bartels.


Hemamalini A.,University of Madras | Mohan Das T.,University of Madras | Mohan Das T.,Central University of Tamil Nadu
New Journal of Chemistry | Year: 2014

A facile regioselective synthesis of bis-triazologlycolipids, a class of organogelators, has been accomplished by "Click reaction". The morphology and self-assembly of the gelators were examined by FESEM and HRTEM analysis. © the Partner Organisations 2014.


Vinoba M.,Korea Institute of Energy Research | Bhagiyalakshmi M.,Central University of Tamil Nadu | Jeong S.K.,Korea Institute of Energy Research | Nam S.C.,Korea Institute of Energy Research | Yoon Y.,Korea Institute of Energy Research
Chemistry - A European Journal | Year: 2012

Bovine carbonic anhydrase (BCA) was covalently immobilized onto OAPS (octa(aminophenyl)silsesquioxane)-functionalized Fe3O 4/SiO2 nanoparticles by using glutaraldehyde as a spacer. The Fe3O4 nanoparticles were coated with SiO2, onto which was grafted OAPS, and the product was characterized using SEM, TEM, XRD, IR, X-ray photoelectron spectroscopy (XPS), and magnetometer analysis. The enzymatic activities of the free and Fe3O4/SiO 2/OAPS-conjugated BCA (Fe-CA) were investigated by hydrolyzing p-nitrophenylacetate (p-NPA), and hydration and sequestration of CO2 to CaCO3. The CO2 conversion efficiency and reusability of the Fe-CA were studied before and after washing the recovered Fe-CA by applying a magnetic field and quantifying the unreacted Ca2+ ions by using ion chromatography. After 30a cycles, the Fe-CA displayed strong activity, and the CO2 capture efficiency was 26-fold higher than that of the free enzyme. Storage stability studies suggested that Fe-CA retained nearly 82 % of its activity after 30a days. Nucleation of the precipitated CaCO3 was monitored by using polarized light microscopy, which revealed the formation of two phases, calcite and valerite, at pHa 10 upon addition of serine. The magnetic nanobiocatalyst was shown to be an excellent reusable catalyst for the sequestration of CO2. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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