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Ahmed G.,University of Rajasthan | Dashora A.,University of Rajasthan | Sharma M.,State Forensic Science Laboratory | Ahuja B.L.,University of Rajasthan
Applied Radiation and Isotopes | Year: 2010

In this paper, we present the first-ever experimental Compton line shapes of HgBr2 and HgI2 using 137Cs Compton spectrometer. To compare our experimental momentum densities, we have computed the Compton profiles using Hartree-Fock and density functional theory within linear combination of atomic orbitals. We have also computed the energy bands and density of states using the linear combination of atomic orbitals and full potential linearized augmented plane wave method. On the basis of equal-valence-electron-density profiles, it is seen that HgI2 is more covalent than HgBr2 which is in agreement with the valence charge densities. The experimental isotropic profiles are found to be relatively in better agreement with the Hartree-Fock data. We have also discussed the photoluminescence and detection properties of both the halides. © 2009 Elsevier Ltd. All rights reserved.

Rana A.K.,State Forensic Science Laboratory | Ankri S.,Technion - Israel Institute of Technology
Frontiers in Genetics | Year: 2016

RNA, the earliest genetic and catalytic molecule, has a relatively delicate and labile chemical structure, when compared to DNA. It is proneto be damaged by alkali, heat, nucleases, or stress conditions. One mechanism to protect RNA or DNA from damage is through site-specific methylation. Here, we propose that RNA methylation began prior to DNA methylation in the early forms of life evolving on Earth. In this article, the biochemical properties of some RNA methyltransferases (MTases), such as 2'-O-MTases (Rlml/RlmN), spOUT MTases and the NSun2 MTases are dissected for the insight they provide on the transition from an RNAworld to our present RNA/DNA/protein world. © 2016 Rana and Ankri.

Islam Q.A.,Indian Central Glass and Ceramic Research Institute | Raja M.W.,State Forensic Science Laboratory | Basu R.N.,Indian Central Glass and Ceramic Research Institute
International Journal of Hydrogen Energy | Year: 2016

The present study aims to develop a series of novel perovskite based materials with a nominal composition of LaxSr1-xBi0.2Co0.35Fe0.45O3-δ (x = 0.5 to 0.8) as oxygen separation membranes. The powder has been synthesized by a soft chemical alanine assisted combustion method. X-ray diffractograms of calcined powders reveal orthorhombic perovskite structure. The optical properties measured by UV-VIS spectroscopy suggest that the variation of lanthanum concentration has mere effect in the electron density as well as band gap of the membranes. Total electrical conductivity as calculated is maximum for the composition with lowest lanthanum concentration (La = 0.5). The permeation flux as measured reveals that the flux generally decreases as the lanthanum concentration increases in the stoichiometry. A highest oxygen permeation flux of 0.23 ml/min/cm2 has been achieved for the composition La0.5Sr0.5Bi0.2Co0.35Fe0.45O3-δ at 900 °C. © 2016 Hydrogen Energy Publications, LLC.

Kumar S.,State Forensic Science Laboratory | Ma Y.G.,CAS Shanghai Institute of Applied Physics
Physical Review C - Nuclear Physics | Year: 2015

The phase space obtained using the isospin quantum molecular dynamical (IQMD) model is analyzed by applying the binding energy cut in the most commonly and widely used secondary cluster recognition algorithm. In addition, for the present study, the energy contribution from momentum-dependent and symmetry potentials is also included during the calculation of total binding energy, which was absent in clusterization algorithms used earlier. The stability of fragments and isospin effects are explored by using the new clusterization algorithm. The findings are summarized as follows: (1) The clusterization algorithm identifies the fragments at quite early time. (2) It is more sensitive for free nucleons and light charged particles compared to intermediate mass fragments, which results in the enhanced (reduced) production of free nucleons (light charged particles, or LCPs). (3) It has affected the yield of isospin-sensitive observables - neutrons (n), protons (p), H3,He3, and the single ratio [R(n/p)] - to a greater extent in the mid-rapidity and low kinetic energy region. In conclusion, the inclusion of the binding energy cut in the clusterization algorithm is found to play a crucial role in the study of isospin physics. This study will give another direction for the determination of symmetry energy in heavy-ion collisions at intermediate energies. © 2015 American Physical Society.

Nirmalkar J.,Pandit Ravishankar Shukla University | Deb M.K.,Pandit Ravishankar Shukla University | Deshmukh D.K.,Pandit Ravishankar Shukla University | Verma S.K.,State Forensic Science Laboratory
Bulletin of Environmental Contamination and Toxicology | Year: 2013

The effects of combustion of the fire crackers on the air quality in eastern Central India were studied for the first time during Diwali festival. This case study analyzes the size distribution and temporal variation of aerosols collected in the rural area of eastern Central India during pre-diwali, Diwali and post-diwali period for the year of 2011. Fifteen aerosol samples were collected during the special case study of Diwali period using Andersen sampler. The mean concentrations of PM10 (respirable particulate matter) were found to be 212.8 ± 4.2, 555.5 ± 20.2 and 284.4 ± 5.8 during pre-diwali, Diwali and post-diwali period, respectively. During Diwali festival PM10 concentration was about 2.6 and 1.9 times higher than pre-diwali and post-diwali period, respectively. PM2.5 (fine) and PM1 (submicron) concentrations during Diwali festival were more than 2 times higher than pre-diwali and post-diwali. © 2012 Springer Science+Business Media New York.

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