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Search Results: 1 - 10 of 223825 matches for " R. Ranjini "
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PRELIMINARY PHYTOCHEMICAL SCREENING OF SEEDS OF PSORALEA CORYLIFOLIA
Mohammed RafiqKhan,Ranjini R
International Research Journal of Pharmacy , 2013,
Abstract: Psoralea corylifolia known as “Babchi” is a medicinal plant for the treatment of skin diseases. In India, indigenous herbal remedies such as Ayurveda and other Indian traditional medicines have since ancient times used plants in treatment of various disorders. In our present investigation preliminary phytochemical analysis of Psoralea corylifolia has been evaluated for the presence of bioactive constituents using various polarity solvents including hexane, butanol, ethanol and water. The phytochemical screening of the plant extracts revealed the presence of maximum compounds including carbohydrates, terpenoids, alkaloids, phenols, tannins, amino acid and proteins, cardiac glycosides. The results suggest that the ethanolic extract of Psoralea corylifolia has promising therapeutic potential and can be used as a base for the development of novel potent drugs in phytomedicine.
Dynamic Key Management Scheme for HWSN Using Efficient Pair Wise Key Distribution Technique
N. Sugandhi,S. Mirdula,D. Manivannan,R. Ranjini
Journal of Artificial Intelligence , 2012,
Abstract: Wireless Sensor Network (WSN) is the well growing technology in the fields of defence, industrial automation, building automation, environmental forecasting, asset management, health care etc. In WSN, each and every node should be secured and this security is achieved by secure group communication. There are many key management techniques used to implement group communication in a secured manner but the key distribution is always being an issue in WSN because of limited capabilities and vulnerable nature of WSN. The proposed WSN totally uses three sort of keys namely Master key, session key and pair wise keys for secured communication are used in WSN. The main goal is to provide secured node to node communication by using efficient pair wise keying mechanism and it uses secret code for secure communication. It provides the better robustness, authentication and more security. The proposed WSN architecture has two hierarchy layers known as H end and L end sensor layers in a cluster. Secured communication between Low end node (L) to Low end node (L) and High end node (H) to High end node (H) follows efficient pair wise keying mechanism. To establish secured communication between Low end node (L) to High end node (H) and Cluster Head (CH) to Cluster Head (CH), new node key should be established before establishing pair wise keying mechanism. Master key is established for the broadcasting of Base Station (BS) to all other nodes. In performance analysis, computation, communication and storage cost are calculated and analysed.
Novel Experimentally Observed Phenomena in Soft Matter
Ranjini Bandyopadhyay
Physics , 2013, DOI: 10.1007/s12043-013-0555-y
Abstract: Soft materials such as colloidal suspensions, polymer solutions and liquid crystals are constituted by mesoscopic entities held together by weak forces. Their mechanical moduli are several orders of magnitude lower than those of atomic solids. The application of small to moderate stresses to these materials results in the disruption of their microstructures. The resulting flow is non-Newtonian and is characterised by features such as shear rate-dependent viscosities and non-zero normal stresses. This article begins with an introduction to some unusual flow properties displayed by soft matter. Experiments that report a spectrum of novel phenomena exhibited by these materials, such as turbulent drag reduction, elastic turbulence, the formation of shear bands and the existence of rheological chaos, flow-induced birefringence and the unusual rheology of soft glassy materials, are reviewed. The focus then shifts to observations of the liquid-like response of granular media that have been subjected to external forces. The article concludes with examples of the patterns that emerge when certain soft materials are vibrated, or when they are displaced with Newtonian fluids of lower viscosities.
Iodido{4-phenyl-1-[1-(1,3-thiazol-2-yl-κN)ethylidene]thiosemicarbazidato-κ2N′,S}{4-phenyl-1-[1-(1,3-thiazol-2-yl)ethylidene]thiosemicarbazide-κS}mercury(II)
Samuel S. R. Dasary,Sri Ranjini Arumugam,Hongtao Yu,Ramaiyer Venkatraman
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681101974x
Abstract: In the title compound, [Hg(C12H11N4S2)I(C12H12N4S2)], the Hg atom is in a distorted square-pyramidal coordination, defined by the iodide ligand, by the S atom of the neutral ligand in the apical position, and by the N atom of the thiazole ring, the thioureido N and the S atom of the deprotonated ligand. The deprotonated ligand intramolecularly hydrogen bonds to the thiazole ring N atom, while the deprotonated ligand forms an intermolecular hydrogen bond to the thiolate S atom. The deprotonation of the tridentate ligand and its coordination to Hg via the S atom strikingly affects the C—S bond lengths. In the free ligand, the C—S bond distance is 1.685 (7) , whereas it is 1.749 (7) in the deprotonated ligand. Similarly, the Hg—S bond distance is slightly longer to the neutral ligand [2.6682 (18) ] than to the deprotonated ligand [2.5202 (19) ]. The Hg—I distance is 2.7505 (8) .
Chloridodiphenyl{[1-(1,3-thiazol-2-yl-κN)ethylidene]-4-phenylthiosemicarbazidato-κ2N1,S}tin(IV) methanol monosolvate
Sri Ranjini Arumugam,Samuel S. R. Dasary,Ramaiyer Venkatraman,Hongtao Yu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811037627
Abstract: The title compound, [Sn(C6H5)2(C12H11N4S2)Cl]·CH4O, is formed during the reaction between 2-acetylthiazole 4-phenylthiosemicarbazone (Hacthptsc) and diphenyltin(IV) dichloride in methanol. In the crystal structure, the Sn atom exhibits an octahedral geometry with the [N2S] anionic tridentate thiosemicarbazone ligand having chloride trans to the central N and the two phenyl groups trans to each other. The Sn—Cl distance is 2.5929 (6), Sn—S is 2.4896 (6) and Sn—N to the central N is 2.3220 (16) . The MeOH molecules link the Sn complexes into one-dimensional chains via N—H...O and O—H...Cl hydrogen bonds.
Isolation of Psychrotrophic multiple drug resistant Pseudomonas from Pasteurised milk
Beena A.K.,Ranjini A.R. and Riya. T.G
Veterinary World , 2011,
Abstract: The present study was taken up with the objective of assessing the microbiological quality of milk processed in an organized dairy plant. The standard plate count and coliform count of all the samples tested were within the limits specified by Prevention of Food Adulteration standards. However microbiological analysis of pasteurized milk revealed a unique bacterial profile characterized by the predominance of Pseudomonas aeruginosa. Assessment of potential of the isolate to multiply at 7oC confirmed its psychrotrophic nature. Antibiogram of the isolate revealed that, of the seven antibiotics tested, the isolate was sensitive only to enrofloxacin. Results are suggestive of the trait of multiple drug resistance in the isolate. Such multiple drug resistant (MDR) bacteria in processed foods are potent biological hazards as there are possibilities for resistance genes to be spread to human beings via food. Isolation of such Multiple drug resistant (MDR) bacteria in pasteurised milk, an essential component of human diet is highly significant from the public health point of view. Presence of Pseudomonas species in processed products implies that post processing contamination can hinder even the quality of properly processed products. The result signifies the importance of appropriate handling practices of processed food to assure safe products at consumer level. [Vet. World 2011; 4(8.000): 349-352]
Mineral Composition of Four Edible Mushrooms
S. E. Mallikarjuna,A. Ranjini,Devendra J. Haware,M. R. Vijayalakshmi
Journal of Chemistry , 2013, DOI: 10.1155/2013/805284
Abstract:
New Bounds on Zagreb indices and the Zagreb Co-indices
Ranjini P. S,V.Lokesha,A. R. Bindusree,M. Phani Raju
Boletim da Sociedade Paranaense de Matemática , 2013,
Abstract: In this short note, we studied the first, second Zagreb indices and the Zagreb Co-indices. Also, established the connections of bounds to the above sighted indices.
Open access on a zero budget: a case study of Postcolonial Text
John Willinsky,Ranjini Mendis
Information Research: an international electronic journal , 2007,
Abstract: Introduction. The founding of a new open access journal is described in terms of its use of the open source software Open Journal Systems, its contribution to a new field of inquiry and its ability to operate on a zero budget in terms of regular expenses. Method. A case study method is deployed describing the circumstances of the journal's founding and current manner of publishing. Analysis. The use of online and open source software, as well as a global team of volunteers is presented as the basis of sustaining an open access approach to publishing. Results. The journal has been able to operate with a zero dollar operating budget over the course of its first six issues and is in a position to continue in this manner. Conclusion. . A strong commitment to the principles of developing a new field of inquiry committed to global issues of access to knowledge, in combination with open source and Internet technologies, has lowered the barriers to the exercise of academic freedom on a modest, but nonetheless global scale.
Use of ultrasound attenuation spectroscopy to determine the size distribution of clay tactoids in aqueous suspensions
Samim Ali,Ranjini Bandyopadhyay
Physics , 2014, DOI: 10.1021/la402478h
Abstract: The dispersion processes of aqueous samples of clay are studied using ultrasound attenuation spectroscopy. The attenuation spectra that are acquired in the frequency range $10-100$ MHz are used to determine the particle size distributions (PSDs) for different concentrations and ages of the clay suspensions. Our analysis, using equivalent spherical diameter (ESD) for circular discs under Stokes drag in samples of concentrations greater than 1.5\% w/v, shows that a substantial fraction of the aggregates in suspension are actually tactoids that are composed of more than one platelet. This is in contrast to the general belief that clay disperses into individual platelets in the concentration range where their suspensions exhibit glassy behavior. We conclude that the incomplete fragmentation of the clay tactoids arises from the rapid enhancement of the inter-tactoid Coulombic repulsion.
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