Batticaloa, Sri Lanka

Eastern University of Sri Lanka
Batticaloa, Sri Lanka

The Eastern University, Sri Lanka is a public university in Vantharumoolai, Eastern Province, Sri Lanka. It was established on 1 October 1986. The university was preceded by the Batticaloa University College established on 1 August 1981 which was started in the buildings of the Vantharumoolai Madya Maha Vidyalayam.At present, the Eastern University, Sri Lanka has a main campus at Vantharumoolai, another campusTrincomalee Campus at Trincomalee and an the Swami Vipulananda Institute of Aesthetic Studies at Kalladi with the facilities of Library Network, Centre for Information and Communication Technology and Sports.Like all public universities in Sri Lanka, it receives the bulk of its funding from the University Grants Commission which is a part of the Ministry of Higher Education in Colombo. Therefore the UGC and the central government exert a great deal of control over EUSL. Wikipedia.

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Ragel F.C.,Eastern University of Sri Lanka
Pramana - Journal of Physics | Year: 2012

We study static spherically symmetric spacetime to describe compact objects with anisotropic matter distribution. We express the system of Einstein field equations as a new system of differential equations using a coordinate transformation, and then write the system in another form with polytropic equation of state and obtain two classes of exact models. The models satisfy all major physical features expected in a realistic star. For polytropic index n = 2, we obtain expressions for mass and density which are comparable with the reported experimental observations. © Indian Academy of Sciences.

Sithambaresan M.,Eastern University of Sri Lanka | Kurup M.R.P.,Cochin University of Science and Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound, C16H17N3O3, exists in the E configuration with respect to the azomethine double bond. The molecule is close to planar, with a dihedral angle of 6.7 (1)° between the aromatic rings. The phenolic O atom functions as donor and acceptor by forming intramolec-ular O - H⋯O and inter-molecular N - H⋯O hydrogen bonds, respectively. Two-dimensional packing is fashioned through an inter-molecular hydrogen bonding network in an offset manner. © Sithambaresan and Kurup 2011.

Koneswaran M.,Eastern University of Sri Lanka | Narayanaswamy R.,University of Manchester
Sensors and Actuators, B: Chemical | Year: 2015

A simple and sensitive method for the determination of vitamin B6 was developed based on the fluorescence quenching of l-cysteine capped CdS/ZnS quantum dots (QDs). The synthesised QDs were characterised using UV-vis absorption spectroscopy, fluorescence spectroscopy, FT-IR spectroscopy and transmission electron microscopy. The influence factors on the determination of vitamin B6 were investigated and the optimum conditions were determined. Under optimum conditions, the fluorescence intensity of l-cysteine capped CdS/ZnS QDs was linearly proportional to vitamin B6 over a concentration range from 0.05 mg L-1 to 6.5 mg L-1 with a correlation coefficient of 0.9946. The detection limit of this system was 0.015 mg L-1. The quenching mechanism was studied using the UV-vis absorption and fluorescence spectroscopy. The fluorescence of these core-shell QDs is quenched effectively by the vitamin B6 without obvious shift in maximum photoluminescence wavelength. Similarly, there is no obvious shift observed in the absorption spectra of l-cysteine capped CdS/ZnS QDs before and after adding the different concentrations of vitamin B6. This confirmed that quenching phenomenon in this system is possibly attributed to the effective electron transfer from QDs to vitamin B6. The proposed method was employed to detect vitamin B6 in the pharmaceutical sample with satisfactory results. © 2015 Elsevier B.V. All rights reserved.

Jude P.J.,University of Jaffna | Dharshini S.,Eastern University of Sri Lanka | Vinobaba M.,Eastern University of Sri Lanka | Surendran S.N.,University of Jaffna | Ramasamy R.,University of Brunei Darussalam
Malaria Journal | Year: 2010

Background. Anopheles culicifacies is the major vector of both falciparum and vivax malaria in Sri Lanka, while Anopheles subpictus and certain other species function as secondary vectors. In Sri Lanka, An. culicifacies is present as a species complex consisting of species B and E, while An. subpictus exists as a complex of species A-D. The freshwater breeding habit of An. culicifacies is well established. In order to further characterize the breeding sites of the major malaria vectors in Sri Lanka, a limited larval survey was carried out at a site in the Eastern province that was affected by the 2004 Asian tsunami. Methods. Anopheline larvae were collected fortnightly for six months from a brackish water body near Batticaloa town using dippers. Collected larvae were reared in the laboratory and the emerged adults were identified using standard keys. Sibling species status was established based on Y-chromosome morphology for An. culicifacies larvae and morphometric characteristics for An. subpictus larvae and adults. Salinity, dissolved oxygen and pH were determined at the larval collection site. Results. During a six month study covering dry and wet seasons, a total of 935 anopheline larvae were collected from this site that had salinity levels up to 4 parts per thousand at different times. Among the emerged adult mosquitoes, 661 were identified as An. culicifacies s.l. and 58 as An. subpictus s.l. Metaphase karyotyping of male larvae showed the presence of species E of the Culicifacies complex, and adult morphometric analysis the presence of species B of the Subpictus complex. Both species were able to breed in water with salinity levels up to 4 ppt. Conclusions. The study demonstrates the ability of An. culicifacies species E, the major vector of falciparum and vivax malaria in Sri Lanka, to oviposit and breed in brackish water. The sibling species B in the An. subpictus complex, a well-known salt water breeder and a secondary malaria vector in the country, was also detected at the same site. Since global warming and the rise in sea levels will further increase of inland brackish water bodies, the findings have significant implications for the control of malaria in Sri Lanka and elsewhere. © 2010 Jude et al; licensee BioMed Central Ltd.

Ramasamy R.,University of Brunei Darussalam | Surendran S.N.,University of Jaffna | Jude P.J.,University of Jaffna | Dharshini S.,Eastern University of Sri Lanka | Vinobaba M.,Eastern University of Sri Lanka
PLoS Neglected Tropical Diseases | Year: 2011

Aedes aegypti (Linnaeus) and Aedes albopictus Skuse mosquitoes transmit serious human arboviral diseases including yellow fever, dengue and chikungunya in many tropical and sub-tropical countries. Females of the two species have adapted to undergo preimaginal development in natural or artificial collections of freshwater near human habitations and feed on human blood. While there is an effective vaccine against yellow fever, the control of dengue and chikungunya is mainly dependent on reducing freshwater preimaginal development habitats of the two vectors. We show here that Ae. aegypti and Ae. albopictus lay eggs and their larvae survive to emerge as adults in brackish water (water with <0.5 ppt or parts per thousand, 0.5-30 ppt and >30 ppt salt are termed fresh, brackish and saline respectively). Brackish water with salinity of 2 to 15 ppt in discarded plastic and glass containers, abandoned fishing boats and unused wells in coastal peri-urban environment were found to contain Ae. aegypti and Ae. albopictus larvae. Relatively high incidence of dengue in Jaffna city, Sri Lanka was observed in the vicinity of brackish water habitats containing Ae. aegypti larvae. These observations raise the possibility that brackish water-adapted Ae. aegypti and Ae. albopictus may play a hitherto unrecognized role in transmitting dengue, chikungunya and yellow fever in coastal urban areas. National and international health authorities therefore need to take the findings into consideration and extend their vector control efforts, which are presently focused on urban freshwater habitats, to include brackish water larval development habitats. © 2011 Ramasamy et al.

Thirukkanesh S.,Eastern University of Sri Lanka | Govender M.,University of KwaZulu - Natal | Lortan D.B.,Durban University of Technology
International Journal of Modern Physics D | Year: 2015

We present a new family of spherically symmetric, static solutions of the Einstein field equations in isotropic, comoving coordinates. The radial pressure at each interior point of these models vanishes yet equilibrium is still possible. The constant density Florides solution which describes the gravitational field inside an Einstein cluster is obtained as a special case of our solution-generating method. We show that our solutions can be utilized to model strange star candidates such as Her. X-1, SAX J1808.4-3658(SS2), SAX J1808.4-3658(SS1) and PSR J1614-2230. © 2015 World Scientific Publishing Company.

Thirukkanesh S.,Eastern University of Sri Lanka | Ragel F.C.,Eastern University of Sri Lanka
Pramana - Journal of Physics | Year: 2013

Static spherically symmetric space-time is studied to describe dense compact star with quark matter within the framework of MIT Bag Model. The system of Einstein's field equations for anisotropic matter is expressed as a new system of differential equations using transformations and it is solved for a particular general form of gravitational potential with parameters. For a particular parameter, as an example, it is shown that the model satisfies all major physical features expected in a realistic star. The generated model also smoothly matches with the Schwarzschild exterior metric at the boundary of the star. It is shown that the generated solutions are useful to model strange quark stars. © Indian Academy of Sciences.

Seran T.H.,Eastern University of Sri Lanka
Pakistan Journal of Biological Sciences | Year: 2013

Ginger (Zingiber officinale Rosc.) is a perennial herb. It belongs to the family Zingiberaceae and commercially cultivated in most tropical regions of the world. The underground rhizomes are the planting materials in a conventional propagation of ginger however it has a low multiplication rate. It is known that there are possible methods are available for rapid vegetative propagation of ginger through direct organogenesis or somatic embryogenesis under in vitro conditions but it is necessary to find the best protocol for in vitro multiplication of ginger. Limited studies on the tissue culture technology of ginger are available in Sri Lanka. However, significant efforts have been made in the procedure for in vitro micropropagation in the other ginger growing countries. The available literature with respect to in vitro plant regeneration has been perused and this review mainly focused on the in vitro propagation via direct organogenesis from rhizome buds or shoot tips of ginger often used as explants. This review article may be an appropriate and effective guidance for establishing in vitro cultures and subsequent production of in vitro plantlets in clonal propagation of ginger. © 2013 Asian Network for Scientific Information.

Thirukkanesh S.,Eastern University of Sri Lanka | Ragel F.C.,Eastern University of Sri Lanka
Pramana - Journal of Physics | Year: 2014

We study static spherically symmetric space-time to describe relativistic compact objects with anisotropic matter distribution and derive two classes of exact models to the Einstein- Maxwell system with a modified Van derWaals equation of state. We motivate a Van derWaals-type equation of state to physically signify a high-density domain of quark matter, and the generated exact solutions are shown to contain several classes of exact models reported previously that correspond to various physical scenarios. Geometrical analysis shows that the physical quantities are well behaved so that these models may be used to describe anisotropic charged compact spheres. © Indian Academy of Sciences.

Johnpillai A.G.,Eastern University of Sri Lanka | Yildirim A.,Ege University | Yildirim A.,University of South Florida | Biswas A.,Ege University | Biswas A.,Delaware State University
Romanian Reports of Physics | Year: 2012

We study the chiral nonlinear Schrödinger's equation with Bohm potential by analyzing an equivalent system of nonlinear partial differential equations from the Lie symmetry point of view. These system of equations are obtained by decomposing the underlying equation into real and imaginary components. The Lie point symmetry generators of the system of equations with respect to zero and non zero values of the coefficient of the Bohm potential are obtained. The optimal system of one-dimensional subalgebras of the Lie symmetry algebra of the system in each of the two cases are used to reduce the system of equations to a system of nonlinear first and second-order ordinary differential equations. Exact group-invariant solutions to the system of equations are constructed from the reduced system of ordinary differential equations.

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