Government College for Women

Chintāmani, India

Government College for Women

Chintāmani, India
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Ali B.,Government College for Women
Indian Journal of Plant Physiology | Year: 2017

Aluminium (Al) is one of the major constraints reducing the growth and productivity of many crops in acidic soils throughout the world. In order to explore a possible measure to counter Al toxicity in plants salicylic acid (SA) was used as a treatment in this investigation. The seedlings of mung bean were grown in a plant growth chamber under controlled conditions in a sand culture. The seedlings were subjected to Al (0.0, 1.0 or 10.0 mM) stress, at 1 week old stage and were sprayed with 0 or 10−5 M of SA, at 14 day stage. The analysis of the plants at the completion of 3 weeks of growth revealed that the presence of Al in the nutrient medium caused a sharp reduction in growth (length, fresh and dry mass of root and shoot), the activity of carbonic anhydrase (E.C. 4.2.1.1), relative water content, water use efficiency, chlorophyll content and the rate of photosynthesis. However, the activity of antioxidative enzymes [catalase (E.C. 1.11.1.6), peroxidase (E.C. 1.11.1.7) and superoxide dismutase (E.C. 1.15.1.1)] in leaves and the content of proline, both in leaves and roots increased in the Al stressed plants. The spray of SA, in absence of Al strongly favoured the above parameters and also improved them in the plants grown under Al stress. Moreover, SA caused a further stimulation of antioxidative enzymes and proline content, which were already enhanced by Al stress. This implies that the elevated level of proline in association with antioxidant system, at least in part, was responsible for the amelioration of Al stress in mung bean seedlings. © 2017, Indian Society for Plant Physiology.


Manjunatha H.C.,Government College for Women
International Journal of Modern Physics E | Year: 2016

We have studied the α-decay half-life and spontaneous fission half-lives of isotopes of superheavy element Z = 122 in the range 275 ≤ A ≥ 326. A comparison of calculated alpha half-lives with the literature [D. N. Poenaru, R. A. Gherghescu and W. Greiner, Phys. Rev. C 83 (2011) 014601, D. N. Poenaru, R. A. Gherghescu and W. Greiner, Phys. Rev. C 85 (2012) 034615] and the analytical formulas of Royer [G. Royer, J. Phys. G; Nucl. Part. Phys. 26 (2000) 1149] shows good agreement with each other. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by [C. Xu, Z. Ren and Y. Guo, Phys. Rev. C 78 (2008) 044329]. A comparative study on the competition of alpha decay versus spontaneous fission of superheavy nuclei (SHN) reveals that around eight isotopes (307-314122) survive fission and have alpha decay channel as the prominent mode of decay and hold the possibility to be synthesized in the laboratory. The alpha decay half-lives and spontaneous fission half-lives of SHN with Z = 122, A = 299-306, with Z = 120, A = 294-300, and with Z = 119, A = 292-297 are also studied. The present study will be useful in the synthesis of superheavy elements Z > 118 by using the actinide based reactions with stable projectiles heavier than 48Ca. © 2016 World Scientific Publishing Company.


Manjunatha H.C.,Government College for Women
International Journal of Modern Physics E | Year: 2016

We have studied the α-decay properties of superheavy nuclei (SHN) Z = 124 in the range 282 ≤ A ≤ 333 using the Coulomb and proximity potential model for deformed nuclei (CPPMDN). The calculated α half-lives agree with the values computed using the Viola-Seaborg systematic, the universal curve of Poenaru et al. [Phys. Rev. C 83 (2011) 014601; 85 (2012) 034615] and the analytical formulas of Royer [J. Phys. G, Nucl. Part. Phys. 26 (2000) 1149]. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by Xu et al. [Phys. Rev. C 78 (2008) 044329]. The calculated half-lives help to predict the possible isotopes of this superheavy element Z = 124. As we could observe α chain consistently from the nuclei 288-312124, we have predicted that these nuclei could not be synthesized and detected experimentally via α decay as their decay half-lives are too small. The nuclei 313-318124 were found to have long half-lives and hence could be sufficient to detect them if synthesized in a laboratory. © 2016 World Scientific Publishing Company.


Manjunatha H.C.,Government College for Women | Sridhar K.N.,Government First grade College
Nuclear Physics A | Year: 2017

We have studied the fusion cross section, survival cross section, fission cross section, compound nucleus formation probability (PCN) and survival probability (PSurv) of superheavy nuclei 126307, 126318, 126319, and 126320. Hence, we have identified the most probable projectile–target combination to synthesis these superheavy nuclei. From the detail study of these parameters, it is clear that for the superheavy nuclei 126307, the projectile target combinations such as 54Fe + 253Fm and 58Ni + 249Cf are most probable projectile target combination for synthesis. The projectile target combinations such as 64Ni + 254Cf and 80Se + 238U are most probable projectile target combination for the synthesis of 126318. The projectile target combinations such as 72Zn + 247Cm and 66Ni + 253Cf are most probable projectile target combination for synthesis the superheavy nuclei 126319. The projectile target combinations such as 66Ni + 254Cf and 82Se + 238U are most probable projectile target combination for synthesis the superheavy nuclei 126320. Thus, we hope that our predictions may be guide for the future experiments in the synthesis of superheavy nuclei Z=126. © 2017 Elsevier B.V.


Manjunatha H.C.,Government College for Women
Applied Radiation and Isotopes | Year: 2014

A dosimetric study of beta-induced bremsstrahlung in bone is important in the field of radiation protection. The beta-induced bremsstrahlung spectra produced by 113 pure beta nuclides in the bone are computed. The spectral shapes are primarily responsible for variations in the shapes by depth-dose distributions. They are intended to provide a quick and convenient reference for spectral shapes and to give an indication of the wide variation in these shapes. The computed bremsstrahlung spectrum is used in the evaluation of bremsstrahlung dose in bone. The evaluated beta bremsstrahlung dose as a function of distance for the studied nuclides is also presented. The beta bremsstrahlung dose decreases with the increase in distance. Present work also estimates the dosimetric parameters of bremsstrahlung such as yield, intensity and dose rate of bremsstrahlung by various pure beta nuclides in tissues of human skeleton such as cortical bone, red marrow, yellow marrow, spongiosa and cartilage. The yield, intensity and dose rate of bremsstrahlung in the cortical bone are higher than that of red marrow, yellow marrow, spongiosa and cartilage. Hence cortical bone is more beta/bremsstrahlung radiosensitive than that of other tissues of human skeleton. The estimated bremsstrahlung efficiency, intensity, photon spectra and photon track-length distributions determine the quality and quantity of the radiation. Precise estimation of this source term is very important in planning for radiotherapy and diagnosis. © 2014 Elsevier Ltd.


Manjunatha H.C.,Government College for Women | Rudraswamy B.,Bangalore University
Health Physics | Year: 2013

Effective atomic numbers' (Zeff) effective electron density (Nel) for human organs and tissues have been computed in the energy region of 1 keV to 100 GeV using WinXCOM. The computed data of Zeff and Nel are tabulated. The computed values are compared with previous results. The computed data of Zeff and Nel for almost all tissues (34 tissues of different human organs) in the given energy range are not available in literature and find application in radiotherapy and dosimetry. Copyright © 2013 Health Physics Society.


Lathika Devi S.K.,Government College for Women | Sudarsana Kumar K.,Government College for Women | Balakrishnan A.,Grenoble Institute of Technology
Materials Letters | Year: 2011

Pure ZnO:Eu 3+ nanoparticles (∼ 50 nm) were prepared by a solution combustion method. ZnO and Eu 2O 3 were used as starting materials and dissolved in nitric acid. Citric acid was used as a fuel. The reaction mixture was heated at 350 °C resulting into a rapid exothermic reaction yielding pure nanopowders. The atomic weight concentration of Eu 3+ doped in ZnO was 20%. Transmission electron microscopy (TEM) was used to study the particle size and morphology. The nanopowders were characterized for phase composition using X-ray diffractrometry (XRD). Particle size distribution (PSD) analysis of ZnO: Eu 3+ showed particle sizes ranging from 30 to 80 nm.The photoluminescence emission spectra of ZnO:Eu 3+ nanostructures showed a strong band emission around 618 nm when excited with 515 nm wavelength. © 2010 Elsevier B.V. All rights reserved.


Manjunatha H.C.,Government College for Women
Nuclear Physics A | Year: 2016

We have studied the possible isotopes of superheavy nuclei Z=126 in the range 288≤A≥339 by studying through their α-decay properties. α-Decay half-life for the isotopes of Z=126 superheavy nuclei in the range 288≤A≥339 is performed within the Coulomb and proximity potential model for deformed nuclei (CPPMDN). The calculated α half-lives agree with the values computed using the Viola-Seaborg systematic, the universal curve of Poenaru et al. (2011) [61]; (2012) [62] and the analytical formulas of Royer (2000) [63]. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by Xu et al. (2008) [72]. As we could observe α chains consistently from the nuclei 288-306126, we have predicted that these nuclei could not be synthesized and detected experimentally via α decay as their decay half-lives are too small, which span the order 10-9 to 10-6 s. Most of the predicted, unknown nuclei in the range 307≤A≥326 were found to have relatively long half-lives. Of these the nuclei 307126, 318126, 319126, 320126 and 323-326126 were found to have long half-lives and hence could be sufficient to detect them if synthesized in a laboratory. © 2015 Elsevier B.V.


Manjunatha H.,Government College for Women
Indian Journal of Nuclear Medicine | Year: 2013

In the nuclear medicine, beta nuclides are released during the treatment. This beta interacts with bone and muscle and produces external Bremsstrahlung (EB) radiation. Present work formulated a new method to evaluate the EB spectrum and hence the Bremsstrahlung dose of therapeutic beta nuclides (Lu-177, Sr-90, Sm-153, I-153, Cs-137, Au-201, Dy-165, Mo-99, Sr-89, Fe-59, P-32, Ho-166, Sr-92, Re-188, Y-90, Pr-147, Co-60, K-42) in bone and muscle. The Bremsstrahlung yields of these beta nuclides are also estimated. Bremsstrahlung production is higher in bone than that of muscle. Presented data provides a quick and convenient reference for radiation protection and it can be quickly employed to give a first pass dose estimate prior to a more detailed experimental study.


Manjunatha H.C.,Government College for Women
Radiation Physics and Chemistry | Year: 2016

Poly methyl methacrylate (PMMA) and Kapton polyimide are polymers used for various aerospace applications. We have measured the gamma attenuation parameters such as mass attenuation coefficient, effective atomic number and electron density of PMMA and Kapton polyimide for various gamma sources of energy ranging from 84keV to 1330keV (170Tm, 57Co, 141Ce, 203Hg, 51Cr, 113Sn, 22Na, 137Cs, 60Co, 22Na and 60Co). The measured values agree with the theoretical values. In the present work, we have also computed energy absorption build-up factors and exposure buildup factor of PMMA and Kapton polyimide for wide energy range (0.015-15MeV) up to the penetration depth of 40 mean free path using Geometrical Progression fitting method. The values of these parameters have been found to change with energy and interaction of gamma with the medium. The present study on gamma attenuation parameters are expected to be helpful in dosimetry, radiation shielding and other radiation physics based applications. The experimental data on the mass attenuation coefficients for Kapton and PMMA is not available in literature. To my knowledge data available e.g. in the NIST data base are based on extrapolations from the measurement of mass attenuation coefficients for the elements. Hence this work is first of its kind and it is useful in the various field of Polymers. © 2016 Elsevier Ltd.

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