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仪器仪表学报 2013年第S1期34卷 171-177页

作者： K.Meera Saheb C.Shasikanth G.venkateswara rao V.Suresh Babu Department of Mechanical Engineering University college of engineering Department of Mechanical Engineering MallaReddy College of Engineering Hyderabad Department of Mechanical Engineering Vardhaman college of engineering Shamshabad Department of Mechanical Engineering

A simple and efficient coupled displacement field method is developed to study the large amplitude free vibration behavior of the moderately thick square plates.A single term trigonometric admissible displacement field is assumed for one of the variables,say,the total rotations(in both X,Y directions).Making use of the coupling equation,the spatial variation for the lateral displacement field is derived in terms of the total *** coupled displacement field method makes the energy formulation to contain half the number of unknown independent coefficients,in the case of a square plate,contrary to the conventional RayleighRitz *** lesser number of undetermined coefficients significantly simplifies the vibration *** expressions for the linear and nonlinear fundamental frequency parameters for the all edges simply supported moderately thick square plates are *** numerical results obtained from the present formulation are in very good agreement with those obtained from the existing literature.

关键词： vibration behavior coupled displacement field thick square plates

Preparation and Characterization of Nano-Sized (Mg(x)Fe(1–x)O/SiO2) (x = 0.1) Core-Shell Nanoparticles by Chemical Precipitation Method

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Advances in Nanoparticles 2012年第3期1卷 37-43页

作者： Mohsen Ahmadipour Mozhgan Hatami Kalagadda venkateswara rao Center Nano science and Technology Institute of Science and Technology Jawaharlal Nehru Technological University Hyderabad Hyderabad India

Magnetic core-shell nanoparticles have been widely studied because of their excellent and convenient magnetic and electrical *** this present work core-shell magneticnanoparticles (MNPs) were synthesized by simple chemical precipitation method. Firstly Mg(x)Fe(1–x)O (magnesiwuestite) nano powder samples were synthesised by low temperature chemical combustion method. Secondly the as synthesised Mg(x)Fe(1–x)O nanoparticles are used to synthesis magnetic core-shell Nano particles byusing 2-propanol, poly ethylene glycol (PEG), ammonia solution 30 wt%, tetraethyl orthosilicate (TEOS). Separation of the core-shell magnetic nanoparticles from the aqueous suspension using a centrifuge. The synthesised MNPs and core shell MNP were characterized by X-ray diffraction (XRD), Thermal gravimetric-differential thermal analyzer (TG-DTA), Transmission electron microscopy (TEM), scanning electron microscopy (SEM), (EDAX) for structural, thermal and morphological respectively. It is observed that the particle size of spherical sampleis 32.5 nm.

关键词： Magnetic Nanoparticle Core-Shell TG-DTA SEM TEM

Method Development and Validation for Simultaneous Estimation of Montelukast Sodium and Desloratadine by RP-HPLC

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American Journal of Analytical Chemistry 2015年第8期6卷 651-658页

作者： Bonthu Mohan Gandhi Atmakuri Lakshmana rao Jangala venkateswara rao Sri Vasavi Institute of Pharmaceutical Sciences Tadepalligudem India V. V. Institute of Pharmaceutical Sciences Gudlavalleru India Bharat Institute of Pharmacy Mangalpally India

A novel, precise, accurate, rapid and cost effective isocratic reverse-phase high performance liquid chromatographic (RP-HPLC) method was developed, optimized and validated for the simultaneous estimation of Montelukast Sodium (MON) and Desloratadine (DES) in pharmaceutical dosage forms. The drugs were estimated using Hypersil BDS C18 (250 mm × 4.6 mm I.D., 5 μ particle size) column. The mobile phase composed of orthophosphoric acid and water in the ratio of 20:80 v/v, at a flow rate of 1.0 ml/min was used for the separation. Detection was carried out at 280 nm. The linearity range obtained was 10 - 30 μg/ml for MON and 5 - 15 μg/ml for DES with retention times of 2.929 min and 4.439 min for MON and DES respectively. The correlation coefficient values were found to be 0.999. Precision studies showed % RSD values less than 2% for both the drugs in all the selected concentrations. The percentage recoveries of MON and DES were in the range of 99.59% - 99.82% and 99.60% - 99.80% respectively. The limit of detection (LOD) and limit of quantification (LOQ) were 0.176 μg/ml, 0.587 μg/ml for MON and 0.087 μg/ml, 0.292 μg/ml for DES respectively. The method was validated as per the International Conference on Harmonization (ICH) guidelines. The proposed validated method was successfully used for the quantitative analysis of commercially available tablet dosage forms.

关键词： Montelukast Sodium Desloratadine HPLC Validation

Surface Analysis of Carbon Steel Protected from Corrosion by a New Ternary Inhibitor Formulation Containing Phosphonated Glycine, Zn2+and Citrate

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Journal of Surface Engineered Materials and Advanced Technology 2013年第1期3卷 28-42页

作者： Boyapati Venkata Appa rao Madala venkateswara rao Sirugudu Srinivasa rao Bojja Sreedhar Department of Chemistry Andhra Loyola College Vijayawada India Department of Chemistry National Institute of Technology Warangal India Department of Chemistry V. R. Siddhartha Engineering College Vijyawada India Inorganic & Physical Chemistry Division Indian Institute of Chemical Technology Hyderabad India

Studies on surface analysis of carbon steel protected from corrosion in low chloride and nearly neutral aqueous environment by a synergistic mixture containing N,N-bis(phosphonomethyl) glycine (BPMG), zinc ions and citrate ions are presented. The effect of addition of citrate to the binary system, BPMG-Zn2+, is quite significant and is well explored through various studies. The surface protective nature is maintained in the pH range 5 - 9. Potentiodynamic polarization studies inferred that the ternary inhibitor is a mixed inhibitor. Impedance studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of carbon steel in the chosen environment. X-ray photoelectron spectroscopic (XPS) analysis of the surface film showed the presence of the elements namely iron, phosphorus, nitrogen, carbon, oxygen and zinc. Deconvolution spectra of these elements in the surface film inferred the presence of oxides/hydroxides of iron(III), Zn(OH)2 and [Fe(III), Zn(II)-BPMG-citrate] heteropolynuclear multiligand complex. This inference is further supported by the reflection absorption Fourier transform infrared spectrum of the surface film. Analysis by scanning electron microscopy (SEM) is presented for both the corroded and protected metal surfaces. Based on all these results, a plausible mechanism of corrosion inhibition is proposed.

关键词： Carbon Steel Corrosion Inhibitor Protective Film Synergism BPMG Citrate

Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

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Open Journal of Physical Chemistry 2011年第1期1卷 11-22页

作者： Chitturi venkateswara rao Lingam Hima Kumar Balasubramanian Viswanathan National Centre for Catalysis Research Department of Chemistry Indian Institute of Technology Madras

Iron and nitrogen containing carbon catalysts were prepared by the pyrolysis of iron (III) tetramethoxyphenylporphyrin complex adsorbed on as-received as well as nitric acid treated carbon black and employed them as oxygen reduction electrodes for hydrogen-oxygen PEM fuel cells. The influence of carbon surface functional groups on the dispersion of active species and electrocatalytic performance is investigated using electron microscopic and electrochemical techniques. The existence of quinone functional groups on the nitric acid treated carbon was evident from X-ray photoelectron spectroscopy and cyclic voltammetry. Rotating disk electrode voltammetry results affirmed the good electrocatalytic activity and stability of pyrolyzed macrocyclic complex adsorbed on nitric acid treated carbon compared to that of as-received carbon. This is ascribed to the greater number of Fe/N active species as well as good dispersion of metal clusters over nitric acid treated carbon support. Fuel cell tests depicted the comparable performance of pyrolyzed complex adsorbed on nitric acid treated carbon with commercial Pt/C at 353 K. Durability measurements performed under fuel cell operating conditions for 120 h indicate the good stability of the catalysts.

关键词： Iron-Based Clusters Non-Precious Catalysts Oxygen Reduction PEM fuel Cells

Rusty pipe syndrome: A case report

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Health 2013年第1期5卷 157-158页

作者： Usharani Thota Vasudeva Murali Machiraju venkateswara rao Jampana Department of Paediatrics Gandhi Medical College Secunderabad India Department of Paediatrics Gandhi Medical College Secunderabad India

Bloody discharge from the breasts in a lactating woman can be caused by various conditions like cracked nipples, mastitis, trauma or ductal papilloma [1]. A physiological condition called rusty pipe syndrome can also ... 详细信息

关键词： Bloody Discharge from the Nipple Rusty Pipe Syndrome

An Herbal Formula LI85008F Inhibits Lipogenesis in 3T3-L1 Adipocytes

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Food and Nutrition Sciences 2011年第8期2卷 809-817页

作者： Krishanu Sengupta Trimurtulu Golakoti venkateswara rao Chirravuri Ajit Kumar Marasetti 不详

The present study demonstrates a novel herbal formulation LI85008F inhibiting adipocyte differentiation and potentiates lipolysis in 3T3-L1 mouse adipocytes. LI85008F is formulated by combining extracts of three Indian herbs Moringa oleifera, Murraya koenigii and Curcuma longa. Oil red O staining of 3T3-L1 adipocytes reveals that LI85008F is a synergistic formulation that inhibits adipocyte differentiation in a dose dependent manner and concurrently down regulates the key adipogenic transcription factors Peroxisome Proliferator-Activated Receptor gamma (PPAR) and CCAAT/enhancer binding protein α (C/EBP). LI85008F confers significant reductions in intracellular triglyceride content in a dose dependent manner. Evidence suggests that LI85008F antagonizes PPAR through Ser112 phosphorylation via MAPK/ERK activation. Immunoblot analyses reveal that LI85008F treatment also down regulates the protein expressions of key PPAR responsive gene products such as Adipocyte differentiation related protein (ADRP), CD36, Adipocyte specific binding protein 2 (aP2) and perilipin. In differentiated adipocytes culture, LI85008F treatment results in significantly (p = 0.0169) increased lipolysis as measured by the release of glycerol. LI85008F does not exhibit cytotoxic effect on adipocytes. Taken together, the results suggest that LI85008F inhibits lipogenesis in adipocytes and concurrently antagonizes PPAR? and other lipogenic factors and in addition, potentiates triglyceride mobilization from the fat cells or enhances lipolysis.

关键词： Adipocytes Adipogenesis Curcuma longa LI85008F Moringa Oleifera Murraya Koenigii

Evaluation of antihepatotoxic potential of Solanum xanthocarpum fruit extract against antitubercular drugs induced hepatopathy in experimental rodents

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Asian Pacific Journal of Tropical Biomedicine 2012年第6期2卷 454-460页

作者： Talib Hussain Ramesh K Gupta Sweety K Mohd Sajid Khan Md Sarfaraj Hussain Md Arif Arshad Hussain Md Faiyazuddin Chandana venkateswara rao Pharmacognosy and Ethnopharmacology Division National Botanical Research Institute Department of Pharmacology and Toxicology Faculty of Pharmacy Integral University Department of Pharmacology Royal College of Pharmacy and Health Sciences Department of Biotechnology Integral University

Objective:To assess the hepatoprotective effect of Solanum xanthocarpum(S. xanthocarpum) fruit extract against antitubercular drug-induced liver toxicity in experimental ***:Ethanolic(50%) fruit extract ofS. xanthocarpum(100, 200 and 400 mg/kg bw) was administered daily for 35 days in experimental animals. Liver toxicity was induced by combination of three antitubercular drugs [isoniazid(I) 7.5 mg/kg, rifampicin(R) 10 mg/kg and pyrazinamide(P) 35 mg/kg] given orally as suspension for 35 days in rats. The hepatoprotective activity was assessed using various biochemical parameters like aspartate aminotransferase(AST), alanine aminotransferase(ALT), alkaline phosphatise(ALP), total bilirubin(TBL), albumin(ALB), total protein(TP), lactate dehydroginase(LDH), and serum cholesterol(CHL). Meanwhile,in vivoantioxidant activities as lipid peroxidation(LPO), reduced glutathione(GSH), superoxide dismutase(SOD) and catalase(CAT) were measured in rat liver homogenate. The biochemical observations were supplemented by histopathological ***:The results demonstrated that treatment ***(P<0.05-P<0.001) and dose-dependently prevented drug induced increase in serum levels of hepatic enzymes. Furthermore,S. xanthocarpumsignificantly(up toP<0.001) reduced the LPO in the liver tissue and restored activities of defence antioxidant enzymes GSH, SOD and CAT towards normal levels. Histopathology of the liver tissue showed that S. xanthocarpumattenuated the hepatocellular necrosis and led to reduction in inflammatory cells ***:The results of this study strongly indicate the protective effect of S. xanthocarpumagainst liver injury which may be attributed to its hepatoprotective activity, and thereby scientifically support its traditional use.

关键词： Solanum xanthocarpum Rifampicin Isoniazid Pyrazinamide Antioxidant Antihepatotoxicity Hepatoprotective effect Antitubercular drug Liver toxicity Liver injury Biochemical parameter Histopathology

Synthesis of ZnO Nanoparticles by a Novel Surfactant Assisted Amine Combustion Method

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Advances in Nanoparticles 2013年第1期2卷 45-50页

作者： Yendrapati Taraka Prabhu Kalagadda venkateswara rao Vemula Sesha Sai Kumar Bandla Siva Kumari Centre for Nano Science and Technology Institute of Science and Technology Jawaharlal Nehru Technological University Hyderabad India Department of Botany Andhra Loyola College Vijayawada India

The as precursor, HMTA as fuel material and non-ionic surfactant (Triton-X 100). The X-Ray diffraction (XRD) analysis revealed that the synthesized ZnO nanopowder has the pure wurtzite structure. The ZnO powder shows polycrystalline nature having the crystallite size 21.25 nm. Crystallite size is calculated using Debye-Scherrer’s and Williamson-Hall equations. Porosity, Cell Volume, Micro strain, Morphology Index, Lorentz factor and Lorentz Polarization factor are also studied. From differential thermal analysis (DTA) & thermo gravimetric (TGA) it has been confirmed that nano powder has the phase purity. The weight loss percentage of the sample is 2.8385%. The particle size obtained 29 nm is in good agreement with the crystallite size calculated from X-Ray Diffraction pattern with the Particle Size Analyzer. The morphology of as prepared Zinc oxide nanopowders are characterized by scanning electron microscope (SEM). From specific area electron diffraction (SAED) pattern has specified the d-spacing and corresponding planes which coincide with the XRD d-spacing and planes.

关键词： HMTA Transmission Electron Microscope (TEM) Triton-X 100 X-Ray Diffraction (XRD)

X-Ray Analysis by Williamson-Hall and Size-Strain Plot Methods of ZnO Nanoparticles with Fuel Variation

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World Journal of Nano Science and Engineering 2014年第1期4卷 21-28页

作者： Yendrapati Taraka Prabhu Kalagadda venkateswara rao Vemula Sesha Sai Kumar Bandla Siva Kumari Botany Department Andhra Loyola College Vijayawada India Centre for Nano Science and Technology IST Jawaharlal Nehru Technological University Hyderabad India

In this paper, a simple and facile surfactant assisted combustion synthesis is reported for the ZnO nanoparticles. The synthesis of ZnO-NPs has been done with the assistance of non-ionic surfactant TWEEN 80. The effect of fuel variations and comparative study of fuel urea and glycine have been studied by using characterization techniques like X-ray diffraction (XRD), transmission electron microscope (TEM) and particle size analyzer. From XRD, it indicates the presence of hexagonal wurtzite structure for ZnO-NPs. Using X-ray broadening, crystallite sizes and lattice strain on the peak broadening of ZnO-NPs were studied by using Williamson-Hall (W-H) analysis and size-strain plot. Strain, stress and energy density parameters were calculated for the XRD peaks of all the samples using (UDM), uniform stress deformation model (USDM), uniform deformation energy density model (UDEDM) and by the size-strain plot method (SSP). The results of mean particle size showed an inter correlation with W-H analysis, SSP, particle analyzer and TEM results.

关键词： Surfactant Assisted Combustion X-Ray Diffraction (XRD) Transmission Electron Microscope (TEM) Particle Analyzer