Pande P.S.,Science and Commerce College
Der Pharma Chemica | Year: 2013
Polar flavanoids and non polar flavanoids have been isolated from the leaves of Ocimum tenuiflorum by chemical method. The isolated extract was screened for antimicrobial activities against Proteus vulgaris, Staphylococcus aureus, Escherichia coli and Salmonella typhi. The extracts showed good to moderate activity against the pathogens.
Kadam R.H.,Materials Research Laboratory |
Birajdar A.P.,Materials Research Laboratory |
Alone S.T.,Science and Commerce College |
Shirsath S.E.,Shinshu University
Journal of Magnetism and Magnetic Materials | Year: 2013
Co0.5Ni0.5CrxFe2-xO4 nanoparticles have been designed by the sol-gel auto combustion method, using nitrates of the respective metal ions, and citric acid as the starting materials. The process takes only a few minutes to obtain as-received Cr-substituted Co-Ni ferrite powders. X-ray diffraction (XRD), vibrational sample magnetometer (VSM), transmission electron microscopy (TEM) are utilized in order to study the effect of variation in the Cr3+ substitution and its impact on particle size, lattice constant, specific surface area, cation distribution and magnetic properties. Lattice parameter, particle size found to decrease with increasing Cr3+ content, whereas specific surface area showed increasing trend with the Cr3+ substitution. Cation distribution indicates that the Cr, Co and Ni ions show preference toward octahedral [B] site, whereas Fe occupies both tetrahedral (A) and octahedral [B] sites. Saturation magnetization (MS) decreased from 65.1 to 40.6 emu/g with the increase in Cr3+ substitution. However, Coercivity increased from 198 to 365 Oe with the Cr3+ substitution. © 2012 Elsevier B.V.
Murade P.A.,Rdik And Kd College |
Sangawar V.S.,Government Vidarbha Institute of Science and Humanities |
Chaudhari G.N.,Nano Technology Research Laboratory |
Kapse V.D.,Science and Commerce College |
Bajpeyee A.U.,Commerce and Science College
Current Applied Physics | Year: 2011
Nanocrystalline La1-xSrxFeO3 (x = 0, 0.1, 0.2, 0.3 and 0.4) was prepared by sol-gel citrate method. The structural and microstructural characterization has been carried out with the help of X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. XRD studies confirm the formation of LaFeO3 with perovskite phase. Further studies by Fourier transform infrared spectroscopy were also conducted. DC electrical properties of the prepared nanoparticles were studied by D.C. conductivity measurements. The gas-sensing performance of the as-prepared La1-xSrxFeO3 nanoparticles was investigated towards different reducing gases like acetone (CH3COCH3), ethanol (C2H5OH), hydrogen sulfide (H2S), hydrogen (H2) and liquefied petroleum gas (LPG). The nanocrystalline La0.7Sr0.3FeO3 exhibited good sensing performance towards acetone gas with rapid response and high sensitivity at 275 °C as compared with LaFeO3. © 2010 Elsevier B.V. All rights reserved.
Pawar P.R.,Science and Commerce College
Marine Pollution Bulletin | Year: 2013
Surface water samples were collected from substations along Sheva creek and Dharamtar creek mangrove ecosystems of Uran (Raigad), Navi Mumbai, west coast of India. Water samples were collected fortnightly from April 2009 to March 2011 during spring low and high tides and were analyzed for pH, Temperature, Turbidity, Total solids (TS), Total dissolved solids (TDS), Total suspended solids (TSS), Dissolved oxygen (DO), Biochemical oxygen demand (BOD), Carbon dioxide (CO2), Chemical oxygen demand (COD), Salinity, Orthophosphate (O-PO4), Nitrite-nitrogen (NO2-N), Nitrate-nitrogen (NO3-N), and Silicates. Variables like pH, turbidity, TDS, salinity, DO, and BOD show seasonal variations. Higher content of O-PO4, NO3-N, and silicates is recorded due to discharge of domestic wastes and sewage, effluents from industries, oil tanking depots and also from maritime activities of Jawaharlal Nehru Port Trust (JNPT), hectic activities of Container Freight Stations (CFS), and other port wastes. This study reveals that water quality from mangrove ecosystems of Uran is deteriorating due to industrial pollution and that mangrove from Uran is facing the threat due to anthropogenic stress. © 2013 Elsevier Ltd.
Deokate R.J.,Science and Commerce College |
Lokhande C.D.,Shivaji University
Sensors and Actuators, B: Chemical | Year: 2014
Undoped and Ga-doped cadmium oxide thin films were prepared by chemical spray pyrolysis technique using (CH3COO)2Cd·2H 2O as a precursor solution without or with (Ga (NO3) 3-x·H2O) as a doping solution, respectively. The dopant concentration (at% Ga to Cd) was varied from 0 to 2.5 at%. X-ray diffraction (XRD) analyses reveals all the films are of polycrystalline cadmium oxide, possessing cubic structure. The film shows the (2 0 0) preferential orientation for undoped CdO and Ga-doped CdO films. The crystallite size for the 1.5 at% Ga-doped film is found to be minimum (15 nm) among all the films. At a higher doping concentration of 2.5 at%, the disorder produced in the lattice causes an increase in the resistivity of the film. It is found that compared to the undoped CdO film, Ga-doped films show high response to LPG. Among all the doped films studied, the 1.5 at% Ga-doped CdO film shows the maximum response (63%) to 1040 ppm of LPG in air at 673 K. Further, the response and recovery times of the films to LPG become shorter at higher operating temperatures. A possible mechanism of LPG sensing has been explained. The photoluminiscence (PL) studies reveal UV emission in pure CdO which shifts to green emission on doping of Ga. © 2013 Elsevier B.V.