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Search Results: 1 - 10 of 189911 matches for " Vidyasagar G "
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G. Vidyasagar
Journal of Global Research in Mathematical Archives , 2013,
Abstract: This paper deals with the combined effect of thermal diffusion and heat absorption on the MHD free convection heat and mass transfer flow of a viscous incompressible fluid past a continuously moving infinite plate. Closed form of solution for the velocity, temperature and concentration field are obtained and discussed graphically for various values of the physical parameters present. In addition, expressions for the skin friction is also derived and finally discussed with the help of table and graphs. Keywords: Free convection, Heat and Mass transfer, Heat Sink, Thermal radiation, Magnetic Field.
G. Vidyasagar
Journal of Global Research in Mathematical Archives , 2013,
Abstract: We study a two-dimensional free convection effects on the steady incompressible laminar MHD heat and mass transfer characteristics of a linearly started porous vertical plate, the velocity of the fluid far away from the plate surface is assumed zero for a quiescent state fluid. The variations of surface temperature and concentration are linear. All the fluid properties are assumed to be constant except for the density variations in the buoyancy force term of the linear momentum equation. The magnetic Reynolds number is assumed to be small, so that the induced magnetic field is neglected. No electrical field is assumed to exist and both viscous and magnetic dissipations are neglected. The Hall effects, the viscous dissipation and the joule heating terms are also neglected. The governing equations are solved numerically by using shooting method. Dimensionless velocity, temperature and concentration profiles are displayed graphically for different values of suction parameter (fw), magnetic parameter ( ), permeability parameter (K), local temperature Grashof number (Gr), local concentration Grashof number (Gc), Prandtl number ( ) and Schmidt number (Sc). The values of skin-friction, Nusselt number and Sherwood number for different physical parameters are also presented through tables. Keywords: Porous medium, MHD, Heat transfer and Mass transfer, Vertical plate.
Antimicrobial activity of α-(2-hydroxy-2-methylpropyl)-ω-(2-hydroxy-3-methylbut-2-en-1-yl) polymethylene from caesalpinia bonducella (L.) flem
Sagar Kavitha,Vidyasagar G
Indian Journal of Pharmaceutical Sciences , 2010,
Abstract: The compound, α-(2-hydroxy-2-methylpropyl)-w-(2-hydroxy-3-methylbut-2-en-1-yl)polymethylene, isolated from ethyl acetate leaf extract of Caesalpinia bonducella (L.) Flem. was evaluated for antimicrobial activity against clinical isolates, Proteus vulgaris, Pseudomonas aeruginosa, Klebsiella sp., Staphylococcus citrus, Staphylococcus aureus, Escherichia coli, Candida albicans and Rhodotorula sp. using agar diffusion method. The compound exerted inhibitory zone at all concentrations and revealed the concentration-dependent activity against all tested bacterial and yeast strains comparable to standards streptomycin sulphate and gentamycin for bacteria and fluconazole and griseofulvin for Candida albicans and Rhodotorula sp. The inhibition zones were wider and clear for C. albicans and Rhodotorula sp. (IZ >20 mm) and for Pseudomonas aeruginosa, P. vulgaris and E. coli zones were greater than standards tested, whereas, zones for Klebsiella sp. and S. aureus were similar to standards.
Babanagare Shankaravva S.,Vidyasagar G.M.
International Research Journal of Pharmacy , 2011,
Abstract: Antifungal compound obtained by Streptomyces sp. JF714876 was examined for its effect on morphological and biochemical alteration in Aspergillus terreus. Microscopic observation revealed swelling of hyphae with deformation and distortion in mycelial structure in presence of moderate concentration of antifungal compound. At high concentration, the compound exhibited fungicidal action. Antifungal treated Aspergillus terreus showed changes in its biochemical content such as, protein, carbohydrates, peroxidase, catalase and amylase as compared to untreated.
Antimicrobial activity of blue-green and green algae
Prashantkumar P,Angadi S,Vidyasagar G
Indian Journal of Pharmaceutical Sciences , 2006,
Abstract: The methanolic extract of a blue-green alga and two green algae have been investigated for in vitro antimicrobial activity against Proteus vulgaris, Bacillus cereus, Escherichia coli, Pseudomonas aeruginosa, Aspergillus niger, Aspergillus flavus and Rhizopus nigricans using agar cup-plate method. Blue-green alga, namely, Microchaete tenera ; and green algae, namely, Nitella tenuissima and Sphaeroplea annulina , showed significant antibacterial activity against Pseudomonas aeruginosa . Microchaete tenera showed good antimicrobial activity against Proteus vulgaris and Aspergillus niger. Sphaeroplea annulina showed feeble antifungal activity against Aspergillus flavus .
Brain targeted nasal midazolam microspheres
Desai Sapna,G.Vidyasagar,Desai Dhruv
International Journal of Pharmacy and Biomedical Sciences , 2010,
Abstract: The purpose of this research was to formulate and systematically evaluate the performances of mucoadhesive microspheres of midazolam. Midazolam microspheres containing carbopol 934P were prepared by emulsion cross linking technique using glutaraldehyde as a cross-linking agent. Results of preliminary trials indicate that volume of cross-linking agent, time for cross-linking, polymer-to-drug ratio and speed of rotation affected characteristics of microspheres. Microspheres were discrete, spherical, and free flowing. The microspheres exhibited good mucoadhesive and also showed high percentage drug entrapment efficiency. The best batch exhibited a high drug entrapment efficiency of 93% and a swelling index of 1.11; in vitro bioadhesion was 89%. The drug release was also sustained for 12 h. The polymer- to-drug ratio had a more significant effect.
Biosynthesis, Characterization, and Antidermatophytic Activity of Silver Nanoparticles Using Raamphal Plant (Annona reticulata) Aqueous Leaves Extract
P. Shivakumar Singh,G. M. Vidyasagar
Indian Journal of Materials Science , 2014, DOI: 10.1155/2014/412452
Abstract: The present work investigated the biosynthesis of silver nanoparticles using Annona reticulata leaf aqueous extract. The biosynthesised silver nanoparticles were confirmed by visual observation and UV-Vis spectroscopy. Appearance of dark brown colour indicated the synthesis of silver in the reaction mixture. The silver nanoparticles were found to be spherical, rod, and triangular in shape with variable size ranging from 23.84 to 50.54?nm, as evident by X-ray diffraction studies, TEM. The X-ray diffraction studies, energy dispersive X-ray analysis, and TEM analysis indicate that the particles are crystalline in nature. The nanoparticles appeared to be associated with some chemical compounds which possess hydroxyl and carbonyl groups, confirmed by FTIR. This is the first and novel report of silver nanoparticles synthesised from Annona reticulata leaves extract and their antidermatophytic activity. 1. Introduction The field of nanotechnology is one of the most active areas of research in modern materials science and technology. It provides the ability to create materials, devices, and systems with fundamentally new functions and properties [1]. Recently, research in synthesis of nanoparticles using microbes and plant extracts gained more importance due to its eco-friendliness; flexible and main point is the evasion of toxic chemicals [2]. When compared to microbes, plant mediated synthesis is actively being practiced by the researchers for its positive advantages like avoidance of maintaining the microbial culture, being time-consuming, and being cost effective [3]. Previously, various plants have been successfully used for the synthesis of biogenic metal nanoparticles [4]. Nanoparticles are synthesized using plant materials such as, Mucuna pruriens [5], Cassia occidentalis [6], banana peel [7], Azadirachta indica [8], Aloe vera [9], Emblica officinalis [10], Capsicum annuum [11], Cinnamomum camphora [12], Gliricidia sepium Jacq. [13], Carica papaya [14], Opuntia ficus-indica [15], Murraya koenigii [16], Ocimum sanctum [17], and Saururus chinensis [18]. The various phytochemicals present within the plant result in effective reduction of silver salts to nanoparticles but their chemical framework is also effective at wrapping around the nanoparticles to provide excellent robustness against agglomeration [19]; the synthesised silver nanoparticles were used effectively against multidrug resistant bacteria [20]; it can be used in many antimicrobial preparations [21]; Durán et al. [22] successfully developed silver nanoparticle impregnated wound dressings and
On the uncertainty inequality as applied to discrete signals
Y. V. Venkatesh,S. Kumar Raja,G. Vidyasagar
International Journal of Mathematics and Mathematical Sciences , 2006, DOI: 10.1155/ijmms/2006/48185
Abstract: Given a continuous-time bandlimited signal, the Shannon sampling theorem provides an interpolation scheme for exactly reconstructing it from its discrete samples. We analyze the relationship between concentration (or compactness) in the temporal/spectral domains of the (i) continuous-time and (ii) discrete-time signals. The former is governed by the Heisenberg uncertainty inequality which prescribes a lower bound on the product of effective temporal and spectral spreads of the signal. On the other hand, the discrete-time counterpart seems to exhibit some strange properties, and this provides motivation for the present paper. We consider the following problem: for a bandlimited signal, can the uncertainty inequality be expressed in terms of the samples, using thestandard definitions of the temporal and spectral spreads of the signal? In contrast with the results of the literature, we present a new approach to solve this problem. We also present a comparison of the results obtained using the proposed definitions with those available in the literature.
D Ramakrishna,,G Vidyasagar,,K Pavan Kumar,,I Madhusudhana Reddy
International Journal of Pharma Sciences and Research , 2011,
Abstract: The present study aims to evaluate medicinal use of Triumfetta pilosa for the treatment of diabetes. Antidiabetic activity of ethanolic extract of Triumfetta Pilosa Roth was evaluated for in-vivo hypoglycemic activity using Streptozotocin induced diabetic rats. Different biochemical parameters were used to determine the bloodglucose levels using streptozotocin induced diabetes and analyzed it effect in kidneys after 21 days treatment. Ethanol extract had shown significant protection and lowered the blood glucose levels when compared to normal in glucose tolerance test. In kidney the changes caused after induction of diabetes showed degeneration’s in proximal tubular epithelial cells in the cortex of kidneys, hemorrhage in the interstitial area and periglomerular lympolytic infiltration and hyalinization of the arterioles which was reduced after feeding withTriumfetta Pilosa .Ethanolic extract of Triumfetta Pilosa prevented alteration in kidney pathology.
An overview on applications of optical spectroscopy in cervical cancers
Chilakapati Murali,Sockalingum G,Vidyasagar M,Manfait M
Journal of Cancer Research and Therapeutics , 2008,
Abstract: Despite advances in the treatment modalities, cervical cancers are one of the leading causes of cancer death among women. Pap smear and colposcopy are the existing screening methods and histopathology is the gold standard for diagnosis. However, these methods have been shown to be prone to reporting errors, which could be due to their subjective interpretation. Radiotherapy is the mainstay of treatment for the locally advanced stages of cervical cancers. The typical treatment regimen spans over 4 months, from the first fraction of radiation to clinical assessment of tumor response to radiotherapy. It is often noticed that due to intrinsic properties of tumors, patients with the same clinical stage and histological type respond differently to radiotherapy. Hence, there exists a need for the development of new methods for early diagnosis as well as for early prediction of tumor radioresponse. Optical spectroscopic methods have been shown to be potential alternatives for use in cancer diagnosis. In this review, we provide a brief background on the anatomy and histology of the uterine cervix and the etiology of cervical cancers; we briefly discuss the optical spectroscopic approach to cervical cancer diagnosis. A very brief discussion on radiation therapy and radiation resistance is also provided. We also share our experiences with the Raman spectroscopic methodologies in cervical cancer diagnosis as well as in the prediction of tumor radioresponse.
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