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Search Results: 1 - 10 of 191294 matches for " Sivaraj D. "
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On $ mbf{gamma} $-semiopen sets
P. Sivagami,D. Sivaraj
Tamkang Journal of Mathematics , 2008, DOI: 10.5556/j.tkjm.39.2008.303-308
Abstract: Characterizations of $ gamma $-semiopen sets, $ gamma $-semiclosed sets, $ gamma$-semiclosure and $ gamma $-semi-interior are given. Properties of $ gamma $-semiopen sets and $ gamma $-semiclosed sets are also discussed.
Some separation axioms in generalized topological spaces
D. Sivaraj,V. Pankajam
Boletim da Sociedade Paranaense de Matemática , 2013,
Abstract: We give different definitions for g-closed sets, R_0, and R_1 spaces in generalized topological spaces, characterize such spaces and compare with the existing results.
Microwave Assisted Synthesis of Novel 1,2,3,4-Tetrahydrocarbazolyl thiazolidin-4-ones and Azetidin-2-ones and its Biological Behavior
T. Surendiran,S. Balasubramanian,Sivaraj D.
Journal of Chemistry , 2009, DOI: 10.1155/2009/424172
Abstract:
Properties of some -dense-in-itself subsets
V. Renuka Devi,D. Sivaraj,T. Tamizh Chelvam
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204403391
Abstract: ℐ-open sets were introduced and studied by Janković and Hamlett (1990) to generalize the well-known Banach category theorem. Quasi-ℐ-openness was introduced and studied by Abd El-Monsef et al. (2000). These are ∗-dense-in-itself sets of the ideal spaces. In this note, properties of these sets are further investigated and characterizations of these sets are given. Also, their relation with ℐ-dense sets and ℐ-locally closed sets is discussed. Characterizations of completely codense ideals are given in terms of semi-preopen sets.
Prediction of Mechanical Properties of Hybrid Fiber Reinforced Polymer Composites
P Sivaraj, G Rajeshkumar
International Journal of Engineering Research , 2014,
Abstract: This work presents a systematic approach to evaluate and study the effect of process parameters on tensile flexural and impact strength of coir and bagasse fiber reinforced polyester-based hybrid composites and also predicts the properties of random oriented hybrid composites. The composite panel was fabricated using hand lay-up method to the size of 300mmx200mmx3mm with various weight percentage of natural fibers namely coir (10, 20 and 30 wt %) and bagasse (10, 20 and 30 wt %) combined with polyester resin. The mechanical properties testing such as tensile, flexural and impact strength were carried out for the samples cut from the fabricated composite panel to the dimensions as per ASTM standard. The significant contribution of mixing of fiber was determined by analysis of variance. The second-order polynomial curve fitting equations are modelled to predict the mechanical properties such as tensile, flexural and impact strength. Also scanning electron microscopy testing was conducted on tensile test specimen to find the fiber matrix interfacial adhesion.
ANTIBACTERIAL ACTIVITY OF BARK EXTRACT OF ACACIA CONCINNA (L)
Xavier Vergeese raja,Rajeshwari Sivaraj
International Journal of Pharma Sciences and Research , 2012,
Abstract: Antimicrobial properties of Bark extract of Acacia concinna (L) were investigated against laboratory isolates of bacteria using well diffusion method. Chloroform extract (13 mm zone diameter of inhibition) demonstrated the highest activity followed by methanol extract (12 mm zone diameter of inhibition.Phytoconstituents present included phenol, tannin, fat and fixed oil, flavanoids, saponin and quinone. The results of antibacterial activity revealed that all the extract showed good inhibitory activity against all the tested pathogens and the chloroform extract showed comparative by better activity than the other extracts against P.aerogenosa and s. aureus. The activities of the extract were compared with standard antibiotics. These results indicate that A. concinna Bark possesses potential broad spectrum antibacterial activity.
SCREENING OF SECONDARY METABOLITES AND ANTIBACTERIAL ACTIVITY OF ACACIA CONCINNA LEAVES
Xavier Vergeese raja,Rajeshwari Sivaraj
International Research Journal of Pharmacy , 2012,
Abstract: The preliminary phytochemical study and in vitro antibacterial activity of the leaf extracts of Acacia concinna having ethno medicinal uses were investigated. The preliminary phytochemical analysis of the extracts revealed the presence of phenol, tannin, fat and fixed oil, flavanoids, saponin and quinone. The extracts were subjected for screening of in vitro antibacterial activity against various pathogens at the concentrations of 500 and 250 μg/ml by well diffusion assay method. The results of antibacterial activity revealed that all the extract showed good inhibitory activity against all the tested pathogens and the chloroform extract showed comparative by better activity than the other extracts against S.pyogens and s. aureus. The activities of the extract were compared with standard antibiotics. These results indicate that A. concinna leaves possesses potential broad spectrum antibacterial activity.
Micrococcal botryomycosis of the left temporal region
Sivaraj S,Muthu Sekhar M,Baig M
Indian Journal of Dental Research , 2007,
Abstract: Botryomycosis arises from chronic infections produced by low-virulence organisms in an altered host environment. Staphylococci have been the most common organisms implicated, but various other bacteria have also been identified in human botryomycosis lesions. The relative balance between the host′s resistance and the microorganism′s virulence may be altered in some way that perpetuates the growth of the lesions in a symbiotic fashion. The diagnosis of botryomycosis is one that is often easily overlooked because it can be confused with other mycetomas such as actinomycosis and nocardosis. We report here a case of micrococcal botryomycosis that occurred in the left temporal region in a 70 year-old male, which was diagnosed by the help of a histopathological examination and microbial cultures.
Plant genetic resources conservation and use in light of recent policy developments
K.S. Varaprasad and N. Sivaraj
Electronic Journal of Plant Breeding , 2010,
Abstract: Plant genetic resources constitute our invaluable assets to meet the growing needs to increase crop production andproductivity. Plant genetic resources constitute a unique global heritage and their conservation and utilization is ofimmediate concern. Over six million accessions of crop germplasm are currently being conserved worldwide in gene banks.Despite its overall advantage and promotion by the international community, in-situ conservation is still inadequate.Various international conventions have addressed the topic of genetic erosion and declining use of agrobiodiversity inmodern agriculture. Concern about the future vulnerability of agricultural production, food security and environmentalstability has moved the conservation and sustainable use of plant genetic resources to the top of the internationaldevelopment agenda. Implications and impact of global conventions/ treaties/ agreements such as Convention on BiologicalDiversity, Trade related intellectual property rights and Sanitary and phytosanitary agreements under WTO, Internationalplant protection convention, Global plan of action, International treaty on plant genetic resources for food and agricultureConvention on international trade in endangered species of wild fauna and flora, Intergovernmental Committee onIntellectual Property and Genetic Resources, Traditional Knowledge and Folklore (ICGTK) was set up in 2001, Internationalunion for protection of plant varieties, Global crop diversity trust and Cartagena Protocol on Biosafety on plant geneticresource activities are discussed. The changing national scenario in light of the above global developments particularly theprovisions under Biological diversity Act and Protection of plant varieties and farmers’ rights act are discussed.The status of PGR conservation, documentation and utilization at global and national level is briefly discussed. Measures topromote PGR utilization including core development, prebreeding, gene prospecting, allele mining, public privatepartnerships and safe transboundary movement are discussed. Major issues and future thrust areas in the field of plant geneticresources are listed.
Oscillation of solutions to third-order half-linear neutral differential equations
Jozef Dzurina,Ethiraju Thandapani,Sivaraj Tamilvanan
Electronic Journal of Differential Equations , 2012,
Abstract: In this article, we study the oscillation of solutions to the third-order neutral differential equations $$ Big(a(t)ig([x(t)pm p(t)x(delta(t))]''ig)^alphaBig)' + q(t)x^alpha( au(t)) = 0. $$ Sufficient conditions are established so that every solution is either oscillatory or converges to zero. In particular, we extend the results obtain in [1] for $a(t)$ non-decreasing, to the non-increasing case.
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