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Tumkur, India

Tumkur University was established in 2004 in Tumkur, Karnataka, India. It was carved out of Bangalore University to accommodate the needs of the students from Tumkur district. Established under the Karnataka State Universities Act, 2000, as a multi-faculty university, it has 12 postgraduate departments, 2 constituent colleges and 94 affiliated colleges. It has established 29 research centres to promote advanced multi-disciplinary research and academic collaborations. In 2012, the University was recognized under section 12 of the UGC Act, 1956. In the same year, the National Assessment and Accreditation Council , an inter-university council of the UGC, accredited the University with "B" Grade in the three-grade rating scale. Wikipedia.


Jogaiah S.,University of Mysore | Jogaiah S.,Yamaguchi University | Govind S.R.,Tumkur University | Tran L.-S.P.,Yamaguchi University | Tran L.-S.P.,RIKEN
Critical Reviews in Biotechnology | Year: 2013

Economically important crops, such as maize, wheat, rice, barley, and other food crops are affected by even small changes in water potential at important growth stages. Developing a comprehensive understanding of host response to drought requires a global view of the complex mechanisms involved. Research on drought tolerance has generally been conducted using discipline-specific approaches. However, plant stress response is complex and interlinked to a point where discipline-specific approaches do not give a complete global analysis of all the interlinked mechanisms. Systems biology perspective is needed to understand genome-scale networks required for building long-lasting drought resistance. Network maps have been constructed by integrating multiple functional genomics data with both model plants, such as Arabidopsis thaliana, Lotus japonicus, and Medicago truncatula, and various food crops, such as rice and soybean. Useful functional genomics data have been obtained from genome-wide comparative transcriptome and proteome analyses of drought responses from different crops. This integrative approach used by many groups has led to identification of commonly regulated signaling pathways and genes following exposure to drought. Combination of functional genomics and systems biology is very useful for comparative analysis of other food crops and has the ability to develop stable food systems worldwide. In addition, studying desiccation tolerance in resurrection plants will unravel how combination of molecular genetic and metabolic processes interacts to produce a resurrection phenotype. Systems biology-based approaches have helped in understanding how these individual factors and mechanisms (biochemical, molecular, and metabolic) "interact" spatially and temporally. Signaling network maps of such interactions are needed that can be used to design better engineering strategies for improving drought tolerance of important crop species. © 2013 Informa Healthcare USA, Inc. Source


Sampath Kumar B.T.,Tumkur University | Manoj Kumar K.S.,Library and Information Center
Aslib Proceedings: New Information Perspectives | Year: 2012

Purpose: The main purpose of the present study is to examine the availability and persistence of URL citations in two LIS open access journals. It also intended to calculate the half-life period of URL citations cited in journal articles. Design/methodology/approach: A total of 2,890 URL citations cited in 689 research articles published in LIS journals spanning a period of 14 years (1996-2009) were extracted. In order to check the accessibility of URL citations, W3C link checker was used. After the initial check, inactive URL citations were listed. Domains and HTTP errors associated with inactive URL citations were identified for further analysis. The half-life period was calculated using the formula t(h)=[t ln(0.5)]/[ln W(t)-ln W(0)]. Findings: The research findings indicated that 57.61 percent (397 of 689) of articles have URL citations and percentage of URL citations increased from 5.98 percent in 1996 to 27.79 percent in 2009. It was found that 26.08 percent of all citations were not accessible during the time of testing and the majority of errors were due to HTTP 404 error code (not found). The domains.net and.gov were more stable compared to the domains.com/.co,.org, and.edu. The half-life was computed to be approximately 11.5 years, which compares favorably against earlier research works. Originality/value: This is a comprehensive study on the availability and persistence of URL citations cited in LIS journals articles spanning a period of 14 years. The findings of the study will be helpful to authors, publishers and editorial staff to improve existing URL citation conventions and to promote URL use to ensure that URL citations are accessible in future. © Emerald Group Publishing Limited. Source


Ramesh T.N.,Tumkur University
Particuology | Year: 2012

The diffusion of ammonia vapors into a solution of aluminum nitrate or ferric nitrate results in the precipitation of their respective hydroxides and oxyhydroxides. Polymorphic phase formation of aluminum hydroxide is controlled by the rate of crystallization. The PXRD patterns of products obtained via vapor phase diffusion revealed that poorly ordered aluminum hydroxide is formed during the initial stages of crystallization. After 8 days, the formation of the bayerite phase of aluminum hydroxide was observed. Upon prolonged exposure to ammonia vapors, bayerite was transformed into gibbsite. The infrared spectrum of the product confirmed the presence of different polytypic phases of aluminum hydroxide. The results demonstrated that the crystal structure of metal hydroxides is controlled by the rate of crystallization, nature of the metal ion, site selectivity and specificity and preparative conditions. © 2011 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. Source


Saraf R.,Indian Institute of Science | Shivakumara C.,Indian Institute of Science | Behera S.,Indian Institute of Science | Dhananjaya N.,BMS College of Engineering | Nagabhushana H.,Tumkur University
RSC Advances | Year: 2015

A series of Bi1-xEuxOX (X = F and Br; x = 0, 0.01, 0.03 and 0.05) phosphors were synthesized at relatively low temperature and short duration (500°C, 1 h). Rietveld refinement results verified that all the compounds were crystallized in the tetragonal structure with space group P4/nmm (no. 129). Photoluminescence spectra exhibit characteristic luminescence 5D0 → 7FJ (J = 0-4) intra-4f shell Eu3+ ion transitions. The magnetic dipole (5D0 → 7F1) transition dominates the emission of BiOF:Eu3+, while the electric dipole (5D0 → 7F2) peak was stronger in BiOBr:Eu3+ phosphors. The evaluated CIE color coordinates for Bi0.95Eu0.05OBr (0.632, 0.358) are close to the commercial Y2O3:Eu3+ (0.645, 0.347) and Y2O2S:Eu3+ (0.647, 0.343) red phosphors. Intensity parameters (Ω2, Ω4) and various radiative properties such as transition rates (A), branching ratios (β), stimulated emission cross-section (σe), gain bandwidth (σe × Δλeff) and optical gain (σe × τ) were calculated using the Judd-Ofelt theory. It was observed that BiOBr:Eu3+ phosphors have a long lifetime (τ) and better optical gain (σe × τ) as compared to reported Eu3+ doped materials. Furthermore, these compounds exhibit excellent photocatalytic activity for the degradation of rhodamine B dye under visible light irradiation. The determined radiative properties and photocatalytic results revealed that BiOBr:Eu3+ phosphors have potential applications in energy and environmental remedies, such as to develop red phosphors for white light-emitting diodes, red lasers and to remove toxic organic industrial effluents. © The Royal Society of Chemistry 2015. Source


Saraf R.,Indian Institute of Science | Shivakumara C.,Indian Institute of Science | Behera S.,Indian Institute of Science | Nagabhushana H.,Tumkur University | Dhananjaya N.,BMS College of Engineering
RSC Advances | Year: 2015

Eu3+-activated layered BiOCl phosphors were synthesized by the conventional solid-state method at relatively low temperature and shorter duration (400°C for 1 h). All the samples were crystallized in the tetragonal structure with the space group P4/nmm (no. 129). Field emission scanning electron microscopy (FE-SEM) studies confirmed the plate-like morphology. Photoluminescence spectra exhibit characteristic luminescent 5D0 → 7FJ (J = 0-4) intra-4f shell Eu3+ ion transitions. The electric dipole transition located at 620 nm (5D0 → 7F2) was stronger than the magnetic dipole transition located at 594 nm (5D0 → 7F1). The evaluated Commission International de l'Eclairage (CIE) color coordinates of Eu3+-activated BiOCl phosphors were close to the commercial Y2O3:Eu3+ and Y2O2S:Eu3+ red phosphors. Intensity parameters (Ω2, Ω4) and various radiative properties such as transition probability (Atot), radiative lifetime (τrad), stimulated emission cross-section (σe), gain bandwidth (σe × Δλeff) and optical gain (σe × τrad) were calculated using the Judd-Ofelt theory. The experimental decay curves of the 5D0 level in Eu3+-activated BiOCl have a single exponential profile. In comparison with other Eu3+ doped materials, Eu3+-activated BiOCl phosphors have a long lifetime (τexp), low non-radiative relaxation rate (WNR), high quantum efficiency (η) and better optical gain (σe × τrad). The determined radiative properties revealed the usefulness of Eu3+-activated BiOCl in developing red lasers as well as optical display devices. Further, these samples showed efficient photocatalytic activity for the degradation of rhodamine B (RhB) dye under visible light irradiation. These photocatalysts are useful for the removal of toxic and non-biodegradable organic pollutants in water. © The Royal Society of Chemistry 2015. Source

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