Cuddapah, India
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Madhurambal G.,Admcollege For Women | Mariappan M.,Rajahs College | Hariharan S.,Government College for Men | Ramasamy P.,SSN College of Engineering | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2013

Mixed crystals of 0.1 and 0.25 zinc magnesium ammonium sulphate were grown by slow evaporation of aqueous solution at room temperature. The bright and transparent crystals obtained were characterized by thermal (TG-DTA), FTIR and XRD analyses. A fitting decomposition pattern for the compound was formulated on the TG curve which shows two stage mass losses between 133 and 478.75 C. In this temperature range, DTA curve shows exothermic peaks supporting the formulated decomposition pattern. The FTIR spectra show the vibration frequencies due to the formation of zinc magnesium ammonium sulphate mixed crystals. Detailed structural analysis of the compound is under progress. © 2013 Akadémiai Kiadó, Budapest, Hungary.


PubMed | Jayalakshmi Memorial Chest Hospital, Yogi Vemana University and Government College for Men
Type: Journal Article | Journal: International journal of mycobacteriology | Year: 2016

A variant of the protein tyrosine phosphatase nonreceptor type 22 (PTPN22) gene is known to be associated with susceptibility to autoimmune diseases and bacterial infections as it acts as an important regulator of T-cell activation. The objective of this study was to evaluate whether PTPN22-C1858T polymorphism is associated with the resistance to pulmonary tuberculosis (PTB). Single-nucleotide polymorphism of PTPN22-C1858T (rs2476601) was genotyped in 124 patients with PTB and 130 healthy controls from India using restriction fragment length polymorphism and direct sequencing of the amplified DNA. The frequencies of genotypes CC, CT, and TT were 100%, 0%, and 0%, respectively, in PTB; and 99.2%, 0.8% and 0%, respectively, in healthy control individuals. These values did not differ significantly between the patients and controls. The mutant allele C1858T was found to be a rare allele in Indian population.


Kumar A.G.S.,Sri Krishnadevaraya University | Obulapathi L.,Annamacharya Institute of Technology and science | Maddaiah M.,P.A. College | Sarmash T.S.,Sri Krishnadevaraya University | And 4 more authors.
AIP Conference Proceedings | Year: 2015

The Cd doped ZnO have versatile applications in the field of solar cells, Optoelectronic devices. The Cd doped ZnO thin films were prepared by reactive dc magnetron sputtering at different O2 Partial Pressures (1-3sccm) on glass substrate. The structure of the compound was determined by XRD, the mictro structure was studied by FE-SEM, the absorption spectra studies were measured with UV-Vis-NIR spectrometer and electrical properties were studied by four probe method. The optical band gap was variation reported in this study. The minimum resistivity found at PO2=2.0sccm. © 2015 AIP Publishing LLC.


Sivaramaiah G.,Government College for Men | Lakshmanarao J.,Sri Venkateswara University
Journal of Alloys and Compounds | Year: 2013

Electron Spin Resonance and optical absorption spectral studies of Cu 2+ ions in 5 Al2O3 + 75 B2O 3 + (20-z) PbO + z CuO (where z = 0.1-1.5 mol.% of CuO) glasses have been reported. The EPR spectra of all the glasses show resonance signals characteristic of Cu2+ ions at both room and low temperatures. The number of spins and Gibbs energy were calculated at different concentrations and temperatures. From the plot of the ratio of logarithmic number of spins and absolute temperature and the reciprocal of absolute temperature, the entropy and enthalpy have been evaluated. The optical absorption spectra of all the glasses exhibit three bands and these bands have been assigned to 2B 1g → 2Eg, 2B1g → 2B2g, and 2B1g → 2A1g transitions in the decreasing order of energy. It is for the first time to observe three optical absorption bands for Cu2+ ions in oxide glasses. Such type of results is due to excellent sample preparation. From the EPR and optical absorption spectroscopies data, the molecular orbital coefficients have been evaluated. © 2012 Elsevier B.V. All rights reserved.


Sivaramaiah G.,Government College for Men | Rao J.L.,Sri Venkateswara University
Proceedings of the Indian National Science Academy | Year: 2012

Using the electron paramagnetic resonance data of VO2+ and Cr+3centers in alkali lead borotellurite glasses, the thermodynamic properties such as Gibbs free energy AG, entropy AS and enthalpy AH have been evaluated. The effect of temperature, concentration and alkali ions on Gibbs free energy is studied for VO2+ and Cr3+ centers in alkali lead borotellurite glasses. It is observed that the Gibbs free energy has increased with the increase of concentration and temperature. The Pauli magnetic susceptibility is calculated at different temperatures ( 123-433 K) for VO 2+ center in lithium lead borotellurite glass. The Pauli magnetic susceptibility is also calculated for Cr3+center in potassium lead borotellurite glass at different temperatures (123-313 K). The pre-exponential coefficient (PEC) is calculated from the logarithmic of number of spins and the reciprocal of absolute temperature graph of VO2+and Cr3+ centers in alkali lead borotellurite glasses. The preexponential coefficient indicates the collision frequency between the transition metal ion and the glass lattice. The relaxation time Tm or T2, is determined from the number of spins and the temperature effect on relaxation time has been studied for the two ions. The Gibbs free energy, pre-exponential coefficient, Pauli magnetic susceptibility, relaxation time are compared between VO 2+ and Cr3+centers in alkali lead borotellurite glasses. These values are also compared between alkali ions in alkali lead borotellutite glasses. © Printed in India.


Sivaramaiah G.,Government College for Men | Lakshmanarao J.,Sri Venkateswara University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2012

Electron Spin Resonance (ESR) and optical absorption studies of 5Al 2O3 + 75H3BO3 + (20-x)PbO + xMnSO4 (where x = 0.5, 1,1.5 and 2 mol% of MnSO4) glasses at room temperature have been studied. The ESR spectrum of all the glasses exhibits resonance signals with effective isotropic g values at ≈2.0, 3.3 and 4.3. The ESR resonance signal at isotropic g ≈ 2.0 has been attributed to Mn2+ centers in an octahedral symmetry. The ESR resonance signals at isotropic g ≈ 3.3 and 4.3 have been attributed to the rhombic symmetry of the Mn2+ ions. The zero-field splitting parameter (zfs) has been calculated from the intensities of the allowed hyperfine lines. The optical absorption spectrum exhibits an intense band in the visible region and it has been attributed to 5Eg → 5T2g transition of Mn3+centers in an octahedral environment. The optical band gap and the Urbach energies have been calculated from the ultraviolet absorption edges. © 2012 Elsevier B.V. All rights reserved.


SivaRamaiah G.,University of Saskatchewan | SivaRamaiah G.,Government College for Men | Lin J.,University of Saskatchewan | Pan Y.,University of Saskatchewan
Physics and Chemistry of Minerals | Year: 2011

Single-crystal and powder electron paramagnetic resonance (EPR) spectroscopic studies of natural amethyst quartz, before and after isochronal annealing between 573 and 1,173 K, have been made from 90 to 294 K. Single-crystal EPR spectra confirm the presence of two substitutional Fe3+ centers. Powder EPR spectra are characterized by two broad resonance signals at g = ~10.8 and 4.0 and a sharp signal at g = 2.002. The sharp signal is readily attributed to the well-established oxygen vacancy electron center E1′. However, the two broad signals do not correspond to any known Fe3+ centers in the quartz lattice, but are most likely attributable to Fe3+ clusters on surfaces. The absolute numbers of spins of the Fe3+ species at g = ~10.8 have been calculated from powder EPR spectra measured at temperatures from 90 to 294 K. These results have been used to extract thermodynamic potentials, including Gibbs energy of activation ΔG, activation energy Ea, entropy of activation ΔS and enthalpy of activation ΔH for the Fe3+ species in amethyst. In addition, magnetic susceptibilities (χ) have been calculated from EPR data at different temperatures. A linear relationship between magnetic susceptibility and temperature is consistent with the Curie-Weiss law. Knowledge about the stability and properties of Fe3+ species on the surfaces of quartz is important to better understanding of the reactivity, bioavailability and heath effects of iron in silica particles. © 2010 Springer-Verlag.


SivaRamaiah G.,University of Saskatchewan | SivaRamaiah G.,Government College for Men | Pan Y.,University of Saskatchewan
Physics and Chemistry of Minerals | Year: 2012

Samples of a natural amethyst, pulverized in air, and irradiated for gamma-ray doses from 0.14 to 70 kGy, have been investigated by powder electron paramagnetic resonance (EPR) spectroscopy from 90 to 294 K. The powder EPR spectra show that the surface Fe 3+ species on the gamma-ray-irradiated quartz differ from its counterpart without irradiation in both the effective g value and the observed line shape, suggesting marked radiation effects. This suggestion is supported by quantitatively determined thermodynamic properties, magnetic susceptibility, relaxation times, and geometrical radius. In particular, the surface Fe 3+ species on gamma-ray-irradiated quartz has larger Gibbs and activation energies than its non-irradiated counterpart, suggesting radiation-induced chemical reactions. The shorter phase-memory time (T m) but longer spin-lattice relaxation time (T 1) of the surface Fe 3+ species on the gamma-ray-irradiated quartz than that without irradiation indicate stronger dipolar interactions in the former. Moreover, the calculated geometrical radius of the surface Fe 3+ species on the gamma-ray-irradiated quartz is three orders of magnitude larger than that of its counterpart on the as-is sample. These results provide new insights into radiation-induced aerosol nucleation, with relevance to atmospheric cloud formation and global climate changes. © 2012 Springer-Verlag.


Siva Ramaiah G.,Government College for Men
Proceedings of the Indian National Science Academy | Year: 2011

From electron paramagnetic resonance data of Fe3+ and Mn 2+ ions in alkali lead tetraborate glasses, the thermodynamic potentials such as Gibbs potential AG, entropy of activation AS, enthalpy of activation AH have been evaluated. The effect of temperature, concentration and alkali ions on Gibbs potential is studied for Fe3+ and Mn 2+ ions in alkali lead tetraborate glasses. It is observed that the Gibbs potential has increased with the increase of concentration and temperature. The Pauli magnetic susceptibility is calculated at 296 K and different temperatures (123-393 K) for Fe3+ and Mn2+ ions in alkali lead tetraborate glasses. The pre-exponetial coefficient is calculated from the logarithmic of number of spins and the reciprocal of absolute temperature graph of Fe3+ and Mn2+ ions in alkali lead tetraborate glasses. The pre-exponential coefficient indicates the collision frequency between the transition metal ion and the glass host lattice. The phase memory relaxation time Tm (T2) and the spin-lattice relaxation time T1 were calculated for the two ions. The temperature effect of the relaxation times was studied for the two ions. The Gibbs potential, pre-exponential coefficient, Pauli magnetic susceptibility, relaxation times were compared among Fe3+ and Mn2+ ions in alkali lead tetraborate glasses. These values were compared among alkali ions in alkali lead tetraborate glasses. © Printed in India.


PubMed | Government College for Men
Type: Journal Article | Journal: European review for medical and pharmacological sciences | Year: 2016

The irisin, recently identified novel molecule, has been shown to be secreted from fibronectin type III domain containing 5 (FNDC5) of skeletal muscle by an unknown protease. It has been proposed that this molecule plays an important role in converting the white adipose tissue to brown adipose tissue and regulating the energy expenditure. Apart from this, its expression and role in various other conditions such as inflammation, hippocampal neurogenesis, aging and other metabolic conditions have been reported. However, due to conflicting results, several issues have been raised regarding its expression, cleavage, circulating levels, detection, excretion, designation, etc.Complete literature survey was performed using PubMed database search to gather available information regarding FNDC5/irisin.The present review discussed on the discovery of irisin, its possible role in physiological and pathological conditions and controversies. It also discussed the current challenges and future perspectives.

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