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Parhi N.,National Institute of Science Education and Research NISER
Computers and Mathematics with Applications | Year: 2011

In this paper, sufficient conditions in terms of coefficient functions are obtained for non-oscillation of all solutions of a class of linear homogeneous third order difference equations of the form y(n+3)+α(n)y(n+2)+β(n) y(n+1)+γ(n)y(n)=0,n<0,Δ3y(n-1)+a(n) Δ2y(n-1)+b(n)Δy(n)+c(n)y(n)=0,n<1, and Δ(p(n-1)Δ2y(n-1))+q(n)Δy(n)+r(n)y(n)=0,n<1, where γ(n)≠0 and p(n)>0. The technique developed depends on non-oscillation of certain linear homogeneous second order difference equations. © 2011 Elsevier Ltd. All rights reserved. Source


Nasim M.,National Institute of Science Education and Research NISER
Journal of Physics: Conference Series | Year: 2014

We present measurements of φ-meson production and elliptic flow (v 2) at mid-rapidity in Au + Au collisions at 7.7-200 GeV. Energy dependence of nuclear modification factor (RcP) of φ meson is presented. The φ-meson RcP has a value ≥ 1.0 for ≤ 39 GeV. The Ω/φ ratios are also presented and show a different trend at the intermediate transverse momentum (pT) for 11.5 GeV compared to higher beam energies. The number-of-constituent quark (NCQ) scaling of v2 has been studied at various beam energies. The NCQ scaling holds for particles and anti-particles separately including the φ meson for ≥ 19.6 GeV, which can be considered as an evidence of partonic collectivity. We observe that φ-meson v2 falls off the trend from the other hadrons at highest measured pT values by 1.8σ and 2.3σ at 7.7 and 11.5 GeV, respectively. Source


Anju K.S.,Indian National Institute for Interdisciplinary Science and Technology | Ramakrishnan S.,Indian National Institute for Interdisciplinary Science and Technology | Srinivasan A.,National Institute of Science Education and Research NISER
Organic Letters | Year: 2011

Chemical equations presented. Synthesis, spectral, and single-crystal X-ray structural analysis of meso-aryl triphyrin(2.1.1) featuring three pyrrole rings and four meso-aryl rings are described. The title compound represents the first example of a ring-contractedmeso-aryl β-unsubstituted free-base triphyrin containing only pyrrole rings reported to date and generates 2-D supramolecular assembly in the solid state. © 2011 American Chemical Society. Source


Sharma N.K.,National Institute of Science Education and Research NISER | Ganesh K.N.,Indian Institute of Science
Organic and Biomolecular Chemistry | Year: 2011

Nucleic (DNA) acids having contiguous stretch of G sequence form quadruplex structure, which is very critical to control cell division. Recently the existence of G-quadruplex in RNA is also reported in presence of monovalent metal ion. PNA is a promising DNA analogue which binds strongly to DNA to form PNA:DNA duplex or PNA2:DNA triplex. PNA also forms quadruplexes such G-quadruplex and i-motif in G and C-rich sequences respectively. aep-PNA containing a prolyl ring is one of several PNA analogues that provide rigidity and chirality in backbone and has binding affinity to natural DNA which is higher than that of PNA. Here we examine the ability of aep-PNA-G to form a quadruplex by UV, CD and mass spectroscopic techniques. © 2011 The Royal Society of Chemistry. Source


Gunanathan C.,National Institute of Science Education and Research NISER | Milstein D.,Weizmann Institute of Science
Chemical Reviews | Year: 2014

Activation of inert chemical bonds by transition metal complexes is an area of utmost importance. Efficient bond activation can provide a leading entry to successful catalytic design with the potential of providing greener synthetic methods for useful products. These coordinatively saturated and unsaturated ruthenium pincer complexes with heteroaromatic and aliphatic backbones developed in recent years exhibit new reactivities, activate strong chemical bonds, and act as efficient catalysts for several synthetic methods including unprecedented green transformations, the pivotal interest of this Review. One of the characteristic properties of pincer complexes is the ability to stabilize low valent metal complexes with uncommon geometries. Source

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