Jayabal S.,Alagappa Chettiar College of Engineering And Technology |
Natarajan U.,Alagappa Chettiar College of Engineering And Technology |
Murugan M.,Regional Office
Journal of Composite Materials | Year: 2011
The fiber that serves as a reinforcement in reinforced composites may be artificial or natural. Past studies show that artificial fibers such as glass, carbon, etc., have been generally used in fiber-reinforced composites. Although glass and other synthetic fiber-reinforced composites possess high specific strength, their fields of application are very limited because of their inherent higher cost of production and low biodegradability. In this study, woven coir and woven coir-glass fiber-reinforced polyester composites were developed and their mechanical properties were evaluated. Scanning electron micrographs of fractured surfaces were used for qualitative evaluations of the interfacial properties of woven coir and woven coir-glass hybrid polyester composites. The results indicated that the properties of woven coir composites can be considerably improved by incorporation of glass plies. © 2011 The Author(s).
Hossein S.M.,Regional Office |
Mohapatra P.K.D.,Vidyasagar University |
De D.,Maulana Abul Kalam Azad University of Technology
Journal of Bionanoscience | Year: 2013
A lossless DNA compression algorithm, based on searching for exact reverse is reported. The compression results show that the exact reverses are one of the main hidden regularities in genetic sequences. The proposed DNA sequence compression algorithm is based on reverse substring and creates online Library file acting as a Look Up Table. The reverse substring is replaced by corresponding ASCII character, reverse substring starting corresponding reversible substring starting encoded from 54(6). This substring length depends on user. It can provide the data security, by using ASCII code and on line Library file acting as a signature. The total running time of this on the set of n characters is O(N2). The algorithm can approach a compression rate of 4.246138 bits/base. Copyright © 2013 American Scientific Publishers.
Karunaratne S.H.P.P.,University of Peradeniya |
Weeraratne T.C.,University of Peradeniya |
Perera M.D.B.,Regional Office |
Surendran S.N.,University of Jaffna
Pesticide Biochemistry and Physiology | Year: 2013
Unprecedented incidence of dengue has been recorded in Sri Lanka in recent times. Source reduction and use of insecticides in space spraying/fogging and larviciding, are the primary means of controlling the vector mosquitoes Aedes aegypti and Ae. albopictus in the island nation. A study was carried out to understand insecticide cross-resistance spectra and mechanisms of insecticide resistance of both these vectors from six administrative districts, i.e. Kandy, Kurunegala, Puttalam, Gampaha, Ratnapura and Jaffna, of Sri Lanka. Efficacy of the recommended dosages of frequently used insecticides in space spraying and larviciding in dengue vector control programmes was also tested.Insecticide bioassay results revealed that, in general, both mosquito species were highly resistant to DDT but susceptible to propoxur and malathion except Jaffna Ae. aegypti population. Moderate resistance to malathion shown by Jaffna Ae. aegypti population correlated with esterase and malathion carboxylesterase activities of the population. High levels of acetylcholinesterase (AChE) insensitivity in the absence of malathion and propoxur resistance may be due to non-synaptic forms of AChE proteins. Moderate pyrethroid resistance in the absence of high monooxygenase levels indicated the possible involvement of 'kdr' type resistance mechanism in Sri Lankan dengue vectors.Results of the space spraying experiments revealed that 100% mortality at a 10. m distance and <50% mortality at a 50. m distance can be achieved with malathion, pesguard and deltacide even in a ground with dense vegetation. Pesguard and deltacide spraying gave 100% mortality up to 50. m distance in open area and areas with little vegetation. Both species gave <50% mortalities for deltacide at a distance of 75. m in a dense vegetation area. Larval bioassays conducted in the laboratory showed that a 1. ppm temephos solution can maintain a larval mortality rate of 100% for ten months, and the mortality rate declined to 0% in the eleventh month. In the field, where 1. ppm concentration is gradually decreased with water usage, 100% mortality was observed only for the first four months, <50% mortality for the next two months, and 0% mortality was observed eight months after the application of temephos. Deltacide can be effectively used for space spraying programmes in Sri Lanka. Larval control can be successfully achieved through temephos with public participation. © 2013.
Bundela P.S.,Regional Office |
Kapoor A.,Narmada gelatins factory
Electronic Journal of Environmental, Agricultural and Food Chemistry | Year: 2010
The Narmada Gelatin produces Lime sludge during its manufacturing operations located at Jabalpur in Madhya Pradesh. Narmada Gelatin is being disposed their wastes through environmentally sound technologies. ACC has being co-processed lime sludge waste through co-processing in their kiln at Kymore. Toward this objective, both ACC and Narmada Gelatin have worked together in the past few months to evaluate the feasibility of co-processing the waste in the kiln at ACC Kymore Works. Earliar it was difficult to dispose of lime sludge for the industry. The quantity of lime sludge is being generated 300 ton per month from the process of deliming it is the process where lime get used for ossein maturation for 40 to 65 days. The huge quantity generation of lime sludge was disposing in open areas or low laying areas. That was being created surface and under ground water pollution. ACC has analyzed the lime sludge sample and has being at Kymore works. The cement process perforce requires high temperature in the kiln around 1400-1450 oC with a high residence time of 4-5 see such high temperature conditions ensure that no noxious emission take place during the co-processing of the waste materials.
Surendran S.N.,University of Jaffna |
Surendran S.N.,University of Manchester |
Sarma D.K.,University of Manchester |
Sarma D.K.,Regional Medical Research Center |
And 7 more authors.
Malaria Journal | Year: 2013
Background: Anopheles subpictus sensu lato is a major malaria vector in South and Southeast Asia. Based initially on polytene chromosome inversion polymorphism, and subsequently on morphological characterization, four sibling species A-D were reported from India. The present study uses molecular methods to further characterize and identify sibling species in Sri Lanka. Methods. Mosquitoes from Sri Lanka were morphologically identified to species and sequenced for the ribosomal internal transcribed spacer-2 (ITS2) and the mitochondrial cytochrome c oxidase subunit-I (COI) genes. These sequences, together with others from GenBank, were used to construct phylogenetic trees and parsimony haplotype networks and to test for genetic population structure. Results: Both ITS2 and COI sequences revealed two divergent clades indicating that the Subpictus complex in Sri Lanka is composed of two genetically distinct species that correspond to species A and species B from India. Phylogenetic analysis showed that species A and species B do not form a monophyletic clade but instead share genetic similarity with Anopheles vagus and Anopheles sundaicus s.l., respectively. An allele specific identification method based on ITS2 variation was developed for the reliable identification of species A and B in Sri Lanka. Conclusion: Further multidisciplinary studies are needed to establish the species status of all chromosomal forms in the Subpictus complex. This study emphasizes the difficulties in using morphological characters for species identification in An. subpictus s.l. in Sri Lanka and demonstrates the utility of an allele specific identification method that can be used to characterize the differential bio-ecological traits of species A and B in Sri Lanka. © 2013 Surendran et al.; licensee BioMed Central Ltd.