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Search Results: 1 - 10 of 401526 matches for " Gajanan M. Pawar "
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Ring opening metathesis polymerization-derived block copolymers bearing chelating ligands: synthesis, metal immobilization and use in hydroformylation under micellar conditions
Gajanan M. Pawar,Jochen Weckesser,Siegfried Blechert,Michael R. Buchmeiser
Beilstein Journal of Organic Chemistry , 2010, DOI: 10.3762/bjoc.6.28
Abstract: Norborn-5-ene-(N,N-dipyrid-2-yl)carbamide (M1) was copolymerized with exo,exo-[2-(3-ethoxycarbonyl-7-oxabicyclo[2.2.1]hept-5-en-2-carbonyloxy)ethyl]trimethylammonium iodide (M2) using the Schrock catalyst Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(OCMe(CF3)2)2 [Mo] to yield poly(M1-b-M2). In water, poly(M1-b-M2) forms micelles with a critical micelle-forming concentration (cmc) of 2.8 × 10 6 mol L 1; Reaction of poly(M1-b-M2) with [Rh(COD)Cl]2 (COD = cycloocta-1,5-diene) yields the Rh(I)-loaded block copolymer poly(M1-b-M2)-Rh containing 18 mg of Rh(I)/g of block copolymer with a cmc of 2.2 × 10 6 mol L 1. The Rh-loaded polymer was used for the hydroformylation of 1-octene under micellar conditions. The data obtained were compared to those obtained with a monomeric analogue, i.e. CH3CON(Py)2RhCl(COD) (C1, Py = 2-pyridyl). Using the polymer-supported catalyst under micellar conditions, a significant increase in selectivity, i.e. an increase in the n:iso ratio was accomplished, which could be further enhanced by the addition of excess ligand, e.g., triphenylphosphite. Special features of the micellar catalytic set up are discussed.
Bone Marrow Derived Mesenchymal Stem Cells –A Boon for the Treatment of Complications in Diabetes Mellitus
Pratik M. Pawar
International Journal of Pharmaceutical and Phytopharmacological Research , 2012,
Abstract: Mammal Bone marrow is an invaluable source of Mesenchymal stem cells. Bone Marrow derived Mesenchymal Stem Cells (BM-MSCs) are multipotent, self-renewing cells found in almost all postnatal organs / tissues and are used in the treatment of various disease conditions. Diabetes mellitus is a metabolic syndrome characterized by increased levels of blood glucose leading to various complications like Diabetic Foot, Diabetic Neuropathy, Diabetic Retinopathy, Diabetic Cardiomyopathy and Diabetic Nephropathy. BM-MSCs are able to differentiate into many cell types, and to proliferate ex vivo. These attributes makes them a potential therapeutic tool for cell replacement therapy in diabetes and other diseases. The present review discusses the isolation and culturing of BM-MSCs along with their potential as new therapeutic agent in the treatment of Diabetes related complications and its limitations.
Evaluation of gasifier based power generation system using different woody biomass
Surendra R. Kalbande,Mrudulata Deshmukh,Harsha M. Wakudkar,Gajanan wasu
Journal of Engineering and Applied Sciences , 2010,
Abstract: Biomass based power generation system having power rating of 10 kW was established at Department of Unconventional Energy Sources, College of Agricultural Engineering and Technology, Dr. Panjabrao Deshmukh Agriculture University, Akola. The system was evaluated for power generation using Prosopis juliflora (Vilaytee babool) and Leucaena leucocephala (Subabool) wood. Specific biomass consumption was found to be decreased from 3.9 to 1.7 kg/kWh at different loading conditions. Thermogram of Leucaena leucocephala and Prosopis juliflora are found better for getting sufficient amount of tar in case of gasification of this material. The quantum of lighter volatile for Leucaena leucocephala (Subabool), and Prosopis juliflora ranges from 55 and 52 %, respectively. Heavier volatile for Leucaena leucocephala (Subabool) and Prosopis juliflora during gasification range from 15 and 17%, respectively. However, on the basis of TGA analysis biomaterial can be gasified effectively.
Pulmonary manifestations of gastroesophageal reflux disease
Gaude Gajanan
Annals of Thoracic Medicine , 2009,
Abstract: Gastroesophageal reflux disease (GERD) may cause, trigger or exacerbate many pulmonary diseases. The physiological link between GERD and pulmonary disease has been extensively studied in chronic cough and asthma. A primary care physician often encounters patients with extra esophageal manifestations of GERD in the absence of heartburn. Patients may present with symptoms involving the pulmonary system; noncardiac chest pain; and ear, nose and throat disorders. Local irritation in the esophagus can cause symptoms that vary from indigestion, like chest discomfort and abdominal pain, to coughing and wheezing. If the gastric acid reaches the back of the throat, it may cause a bitter taste in the mouth and/or aspiration of the gastric acid into the lungs. The acid can cause throat irritation, postnasal drip and hoarseness, as well as recurrent cough, chest congestion and lung inflammation leading to asthma and/or bronchitis/ pneumonia. This clinical review examines the potential pathophysiological mechanisms of pulmonary manifestations of GERD. It also reviews relevant clinical information concerning GERD-related chronic cough and asthma. Finally, a potential management strategy for GERD in pulmonary patients is discussed.
Effect of Camphor Sulfonic Acid Doping on Structural, Morphological, Optical and Electrical Transport Properties on Polyaniline-ZnO Nanocomposites  [PDF]
S. L. Patil, M. A. Chougule, S. G. Pawar, Shashwati Sen, V. B. Patil
Soft Nanoscience Letters (SNL) , 2012, DOI: 10.4236/snl.2012.23009
Abstract: In the present work, we report on effect of camphor sulfonic acid (CSA) doping on polyaniline-ZnO (50%) nanocomposites prepared by spin coating method on glass substrates. The XRD analysis revealed that the addition of CSA has no effect on crystallinity of PANi-ZnO nanocomposites. Surface morphological studies (SEM) showed that CSA has a strong effect on morphology of PANi-ZnO. The FTIR & UV-Vis spectroscopy confirmed the interaction between CSA and PANi-ZnO nanocomposite. DC electrical conductivity studies showed an increase in conductivity of PANi-ZnO nanocomposites by one order due to addition of CSA (10% - 50%).
Finite Elemental Analysis of Influence of Shape and Profile of Cutting Edge of Twist Drill on Drilling Process
M. J. Pawar,V. S. Jadhav
International Journal of Engineering and Advanced Technology , 2012,
Abstract: The aims of the investigations presented in thispaper were to measure the tool load under conditions of drillingand to analyze if changes of the cutting edge shape and profilesignificantly influence the edge stresses. The described methodsto analyze the influences of edge shape modifications willcontribute to the optimization of drilling tools. Based on aspecific cutting edge shape of a drill, systematic changes to theedge were made. Forces and temperatures on the cutting edgewere measured as well as the heat flow into the chips and theworkpiece. Using a quick-stop device, length and type of chip forthe different drills under various machining parameters wereobserved. It could be shown that the modification of thetransition from the chisel to the cutting edge influences thestress developed, heat in chip and chip formation. Machiningwith a rounded cutting edge shape compared to a sharp edgereduces the mechanical load but slightly increases thermal toolload. The presented experimental and FEA method show thepossibility of determining influences of modified cutting edgeshapes and to adapt the drill to the needs of the drilling process.The cutting force and stress developed during drilling processeshas direct influence on the generation of heat, tool wear, qualityof machined surface and accuracy of workpiece. Due to complextool geometry, cutting conditions and some unknown factorstheoretical cutting force and stress calculation failed to produceaccurate results. To see the behavior of drill either experimentalor Finite Elemental Analysis can be used. By using both themethods validation of results can be possible.
B. P. Ladgaonkar,A. M. Pawar
International Journal of Advances in Engineering and Technology , 2011,
Abstract: Wireless Sensors Network is a novel field shows tremendous application potential. To monitor the environmental parameters of high-tech polyhouse the Wireless Sensors Network (WSN) is developed. The heart of this ubiquitous field is the Wireless Sensor Node. Moreover, the field of microcontroller based embedded technology is innovative and more reliable. Therefore, based on an embedded technology and the RF module Zigbee a wireless senor node is designed about highly promising AVR ATmega8L microcontroller and implemented for WSN development. Recently, the modern agriculturists are demanding sophisticated instrumentation for measurement and control of environmental parameters of the polyhouse. To enhance crop yield one has to provide controlled environment to the crop. The humidity is important parameter, which plays vital role on the crop yield. Therefore, a Wireless Sensors Network (WSN) is designed and implemented for monitoring of humidity of polyhouse and the results of implementation are interpreted in this paper.
Pawar Harshal Ashok,D’mello Priscilla M
International Journal of Research in Ayurveda and Pharmacy , 2011,
Abstract: Fungal infections remain a significant cause of morbidity and mortality despite advances in medicine and the emergence of new antifungal agents. Treatment of these infections is a real challenge to health professionals. The available antifungal drugs produce many adverse effects, show recurrence or lead to development of resistance. To overcome these problems, the development of newer antifungal compound against new targets is the matter of urgency. The present investigation was aimed at evaluation of antifungal activity of methanolic extract of Cassia tora leaves. The extract was prepared by hot continuous percolation method in Soxhlet apparatus using 90% methanol as an extracting solvent. The cup plate method was used to investigate the antifungal activity. The methanolic extract of Cassia tora leaves demonstrated significant antifungal activity against Candida albicans.The minimum inhibitory concentration was found to be 2mg/ml.Amphotericine-B was used as standard to compare the activity.
Extraction and separation studies of Ga(III), In(III) and Tl(III) using the neutral organophosphorous extractant, Cyanex-923
Journal of the Serbian Chemical Society , 2003,
Abstract: The neutral extractant, Cyanes-923 has been used for the extraction and separation of gallium(III), indium(III) and thallium(III) from acidic solution. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the pH range 4.5 5.5, 5.0 6.5 and 1.5 3.0, respectively, and from the organic phase they can be stripped with 2.0 mol dm-3 HNO3, 3.0 mol dm-3 HNO3 and 3.0 mol dm-3 HCl, respectively. The effect of pH equilibration period, diluents, diverse ions and stripping agents on the extraction of Ga(III), In(III) and Tl(III) has been studied. The stroichiometry of the extracted species of these metal ions was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were [MCl3. 3Cyanex-923] [where M = Ga(III) or In(III) ] and [HTlCl4. 3Cyanex-923]. Based on these results a sequential procedure for the separation of Ga(III), In(III) and Tl(III) from each other was developed.
Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant
Ghag Snehal M.,Pawar Suresh D.
Journal of the Serbian Chemical Society , 2010, DOI: 10.2298/jsc090617118g
Abstract: A systematic study of the solvent extraction of uranium(VI) and thorium(IV) from hydrobromic acid media was performed using the neutral phosphine oxide extractant Cyanex-923 in toluene. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the acidity range 5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The effect of the equilibrium period, diluents, diverse ions and stripping agent on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the extracted species of these metal ions was determined based on the slope analysis method. The extraction reactions proceed by solvation and their probable extracted species found in the organic phase were UO2Br2 2Cyanex-923 and ThBr4 2Cyanex-923. Based on these results, a sequential procedure for their separation from each other was developed.
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