Kale P.D.,Sant Gadge Baba Amravati University
Journal of Chemical and Pharmaceutical Research | Year: 2013
The required starting material 3-(2-(4-substitutedphenyl)-hydrazono)-pentane-2, 4-dione (2a-b) was synthesized from 4-substitutedaniline reacted with acetyl acetone. The compound (2a-b) react with hydrazine hydrate and phenyl hydrazine to give 4-((4-substitutedphenyl)-diazenyl)-3,5-dimethyl-1H-pyrazole (3a-b) and 4-((4-substituted phenyl)-diazenyl)-3,5-dimethyl-1-phenyl-1H-pyrazole (4a-b) respectively. 1-(4-((4-substitutedphenyl)-diazenyl)-3,5- dimethyl-1H-pyrazol-1-yl)-ethanone (5a-b) has been synthesized by the treatment of 4-((4-substitutedphenyl)- diazenyl)-3,5-dimethyl-1H-pyrazole (3a-b) with acetyl chloride in pyridine. The newly synthesized compounds were characterized by analytical and spectral studies. All the synthesized compounds were evaluated for antimicrobial activity. Some of these compounds show moderate antimicrobial activity as compared to the known reference drug ciprofloxacin.
Dudul S.V.,Sant Gadge Baba Amravati University
IEEE Transactions on Industrial Electronics | Year: 2011
Induction motors are subject to different faults which, if undetected, may lead to serious machine failures. From the scrupulous review of related works, it is observed that neurofuzzy and neural network (NN)-based fault-detection schemes are performed well for large machines and they are not only expensive but also complex. In this paper, the authors developed the radial-basis- functionmultilayer-perceptron cascade-connection NN-based fault-detection scheme for the small and medium sizes of three-phase induction motors. Stator winding interturn short, rotor eccentricity, and both faults simultaneously are selected for demonstration. Simple statistical parameters of stator current are considered as input features. Principal component analysis is used to select suitable inputs to the network. Experimental results are included to show the ability of the proposed classifier for detecting faults. Moreover, the network is tested for the robustness to the uniform and Gaussian noises. Having good classification accuracy with enough robustness to noises, the proposed classifier is suitable for the real-world applications. © 2010 IEEE.
Schoene B.,Princeton University |
Samperton K.M.,Princeton University |
Eddy M.P.,Atmospheric and Planetary science |
Keller G.,Princeton University |
And 4 more authors.
Science | Year: 2015
The Chicxulub asteroid impact (Mexico) and the eruption of the massive Deccan volcanic province (India) are two proposed causes of the end-Cretaceous mass extinction, which includes the demise of nonavian dinosaurs. Despite widespread acceptance of the impact hypothesis, the lack of a high-resolution eruption timeline for the Deccan basalts has prevented full assessment of their relationship to the mass extinction. Here we apply uranium-lead (U-Pb) zircon geochronology to Deccan rocks and show that the main phase of eruptions initiated ∼250,000 years before the Cretaceous-Paleogene boundary and that >1.1 million cubic kilometers of basalt erupted in ∼750,000 years. Our results are consistent with the hypothesis that the Deccan Traps contributed to the latest Cretaceous environmental change and biologic turnover that culminated in the marine and terrestrial mass extinctions.
Kon K.V.,Kharkiv National Medical University |
Rai M.K.,Sant Gadge Baba Amravati University
Expert Review of Anti-Infective Therapy | Year: 2012
Antibiotic resistance is documented to be a serious problem that affects the choice of appropriate antibiotic therapy and increases the probability of unfavorable infection outcome. One of the proposed methods to cope with multidrug-resistant (MDR) bacteria is the use of alternative antibacterial treatments, which include natural antimicrobial substances such as plant essential oils (EOs). The aim of the present article is to review published studies on the activity of EOs and their constituents against MDR bacteria and to formulate perspectives for the future. In general, published studies indicate that EOs can be used as effective antiseptics against many species, including MDR bacteria, such as methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci, resistant isolates of Pseudomonas aeruginosa, Klebsiella pneumoniae and others; certain EOs may potentiate the effectiveness of antibiotics against MDR bacteria; EOs can be synergistic with bacteriophages; and polymeric nanoparticles can be used for delivery of EOs and enhancement of their activity at the site of infection. © 2012 2012 Expert Reviews Ltd.
Bajaj N.S.,Sant Gadge Baba Amravati University |
Omanwar S.K.,Sant Gadge Baba Amravati University
Optical Materials | Year: 2013
The polycrystalline sample of KSr4 (BO3) 3:Dy [KSBD] was successfully synthesized by novel solution combustion synthesis and has been studied for its thermoluminescence (TL) characteristics. The TL glow curve of the compound was composed of two peaks around 183 °C and 314 °C. The peaks are deconvoluted to determine kinetic parameters i.e. trap depth or activation energy and frequency factor from the glow curve by using peak shape method. Though the Zeff of KSBD material is very high, TL sensitivity of the phosphor was found to be as responsive as commercial phosphor TLD-100. Fading effect, variation of TL glow peak intensity with dose also been studied. The emission spectra monitored for 350 nm excitation shows the characteristic emission of Dy3+ ions. © 2013 Elsevier B.V. All rights reserved.
Adhav K.S.,Sant Gadge Baba Amravati University
Astrophysics and Space Science | Year: 2012
The exact solutions of the field equations in respect of LRS Bianchi type-I space time filled with perfect fluid in the framework of f(R, T) gravity (Harko et al., arXiv:1104.2669v2 [gr-qc], 2011) are derived. The physical behavior of the model is studied. In fact, the possibility of reconstruction of the LRS Bianchi type-I cosmology with an appropriate choice of a function f(T) has been proved in f(R, T) gravity. © 2011 Springer Science+Business Media B.V.
Rai M.,Sant Gadge Baba Amravati University |
Ingle A.,Sant Gadge Baba Amravati University
Applied Microbiology and Biotechnology | Year: 2012
Nanotechnology is a promising field of interdisciplinary research. It opens up a wide array of opportunities in various fields like medicine, pharmaceuticals, electronics and agriculture. The potential uses and benefits of nanotechnology are enormous. These include insect pests management through the formulations of nanomaterials-based pesticides and insecticides, enhancement of agricultural productivity using bio-conjugated nanoparticles (encapsulation) for slow release of nutrients and water, nanoparticle-mediated gene or DNA transfer in plants for the development of insect pestresistant varieties and use of nanomaterials for preparation of different kind of biosensors, which would be useful in remote sensing devices required for precision farming. Traditional strategies like integrated pest management used in agriculture are insufficient, and application of chemical pesticides like DDT have adverse effects on animals and human beings apart from the decline in soil fertility. Therefore, nanotechnology would provide green and efficient alternatives for the management of insect pests in agriculture without harming the nature. This review is focused on traditional strategies used for the management of insect pests, limitations of use of chemical pesticides and potential of nanomaterials in insect pest management as modern approaches of nanotechnology. © Springer-Verlag 2012.
Waghuley S.A.,Sant Gadge Baba Amravati University
Indian Journal of Pure and Applied Physics | Year: 2011
Tin dioxide (SnO2) material changes its properties depending on the ambient gas which can be utilized as gas sensing materials. Usually changes in electrical resistance/conductance in response to environmental gases are monitored. SnO2 and double layer (SnO2/Al 2O3) sensors have been prepared by screen-printing technique on glass substrate. The sensors were used for different concentration (ppm) of CO2 gas investigation at different temperature. The sensing response (sensitivity) of SnO2/Al2O3 double layer sensor was found to be higher, compared with pure SnO2 sensor. The average grain size of SnO2 was determined from XRD pattern and found to be 120.7 nm. The activation energy (Ea) of first order reaction (n =1) for SnO2 has been found to be 72.06 kJ/g-mol from endo DDTA and 325.95 kJ/g-mol from exo DDTA. The microstructure of SnO 2 has been studied from SEM analysis. The oxygen ions adsorb onto the surface of material removes electrons from the bulk and create a potential barrier that limits electron movement and resistivity. When exposed to an oxidizing gas such as CO2 then it is chemisorbed on bridging oxygen atoms with the formation of a surface carbonate, subsequently increasing the barrier height and resistivity.
Nemade K.R.,Sant Gadge Baba Amravati University |
Waghuley S.A.,Sant Gadge Baba Amravati University
Solid State Sciences | Year: 2013
Liquid petroleum gas (LPG) sensing characteristics of graphene/Bi 2O3 quantum dots (QDs) composites have been studied. The prepared materials were characterized through X-ray diffraction, atomic force microscopy, Raman, high resolution-transmission electron microscopy along with selected area electron diffraction, ultraviolet-visible spectroscopy, fluorescence spectroscopy and thermo gravimetric-differential thermal analysis. The X-ray diffraction pattern of Bi2O3 showed broad peaks and intense absorption at 362 nm in UV-VIS spectrum confirms that chemically synthesized Bi2O3 particles are quantum dots. The composites show significant better performance towards the LPG. The defects chemistry was employed to analyse the increasing gas sensing properties with an increasing wt.% of graphene. Also, excellent correlation observed between the defects concentration (IUV/IDL) and sensing response as a function of wt.% of graphene. © 2013 Elsevier Masson SAS. All rights reserved.
Dar M.A.,Sant Gadge Baba Amravati University |
Ingle A.,Sant Gadge Baba Amravati University |
Rai M.,Sant Gadge Baba Amravati University
Nanomedicine: Nanotechnology, Biology, and Medicine | Year: 2013
The newly identified pathogenic species of the genus Cryphonectria was exploited for the synthesis of silver nanoparticles (AgNPs). The extracellular synthesis of nanoparticles was fast and eco-friendly. These nanoparticles were analyzed and determined by ultraviolet-visible spectrophotometry, which detected AgNPs in the solution, and by NanoSight LM20, which determined their average size and concentration. The synthesized AgNPs showed a little monodispersity in the range of 30-70 nm with a concentration of 6.82 × 108 particles per milliliter of solution. The AgNPs demonstrated antibacterial activity against Staphylococcus aureus, Escherichia coli, Salmonella typhi, and Candida albicans, with comparatively higher activity against both S. aureus and E.coli than against S. typhi and C. albicans, which showed the lowest activity. The present study demonstrates the possible use of biologically synthesized AgNPs in the field of medicine. Thus, Cryphonectria sp. could be used for simple, nonhazardous, and efficient synthesis of AgNPs. From the Clinical Editor: In this study Cryphonectria sp. was exploited for simple, nonhazardous, and efficient biosynthesis of silver nanopartricles, which had antibacterial activity against a variety of human pathogenic bacteria. © 2013 Elsevier Inc.