Faculty of Science: Recent submissions

Now showing items 141-160 of 655

Anopheles culicifacies sibling species B and E in Sri Lanka differ in longevity and in their susceptibility to malaria parasite infection and common insecticides

Surendran, S.N.; Ramasamy, M.S; De Silva, B.G.D.N.K; Ramasamy, R (The Royal Entomological Society, 2006)

Members of the Anopheles culicifacies Giles complex (Diptera: Culicidae) are well established as the predominant vectors of malaria in Sri Lanka. Until recently, only sibling species B was reported to be present in Sri ...
Some characteristics of the larval breeding sites of Anopheles culicifacies species B and E in Sri Lanka

Surendran, S.N.; Ramasamy, R (Journal of Vector Borne Diseases, 2005-06)

Background & objectives: Anopheles culicifacies Giles, the major malaria vector in Sri Lanka, exists as a species complex comprising two sympatric sibling species-species B and E. Species E is reported to be the major ...
Some aspects on the feeding of Gerres oblongus (Cuvier, 1830) dwelling from the Jaffna lagoon

Abyerami, B; Sivashanthini, K (Asian Network for Scientific Information, 2008)

A total of 179 fishes of Gerres oblongus (Cuvier, 1830) ranging in standard length 40 to 169 mm were collected in the morning from four collection sites in tire Jaffna lagoon. The stomach contents were assessed qualitatively ...
Molecular studies of Anopheles culicifacies (Diptera: Culicidae) in Sri Lanka: Sibling species B and E show sequence identity at multiple loci

Surendran, S.N.; Hawkes, N.J; Steven, A; Hemingway, J; Ramasamy, R (2006)

The anomaly that Anopheles culicifacies (Diptera: Culicidae) species B is a major vector of malaria in Sri Lanka, but a non-vector in India, has been noted for several years. In 1999, a Y chromosome dimorphism associated ...
The anopheles culicifacies and an. subpictus species complexes in Sri Lanka and their implications for Malaria control in the country

Surendran, S.N.; Ramasamy, R (The Japanese Society of Tropical Medicine., 2010)

Anopheles culicifacies, the major vector of malaria in Sri Lanka, and An. subpictus, a secondary vector, exist as species complexes in the country. Among the globally reported five sibling species (A-E) of the An. culicifacies ...
Morphometric and meristic characterization of Phlebotomus argentipes species complex in northern Sri Lanka: Evidence for the presence of potential leishmaniasis vectors in the country

Gajapathy, K; Jude, P.J; Surendran, S.N. (2011)

The transmission of cutaneous leishmaniasis (CL) is of public health concern in Sri Lanka. The parasite Leishmania donovani is reported to be the causative agent for CL in Sri Lanka. However there is no report on the vector ...
Perception and personal protective measures toward mosquito bites by communities in Jaffna District, northern Sri Lanka

Surendran, S.N.; Kajatheepan, A (The American Mosquito Control Association, Inc, 2007-06)

Mosquito-borne diseases are of public health importance in war-torn northern Sri Lanka. The severity of mosquito bites and attitudes of the public toward mosquito problems were investigated using a structured questionnaire ...
A note on the larvicidal efficacy of saponin constituted crude extracts of plant and animal origin against Aedes aegypti l.

Surendran, S.N.; Kumaran, V; Sivarajah, R; Krishnarajah, S.R; Srikaran, R; Raghavendra, K (Journal of the National Science Foundation of Sri Lanka, 2009)

Natural products of plant and animal origin are preferred over synthetic insecticides due to their eco-friendly nature. The use of natural products and their derivatives are being advocated for the control of insect vectors ...
Morphometric description of sandflies belong to genus Sergentomyia (Sergentomyia) (Diptera; Psychodidae; Phlebotominae) in Sri Lanka; evidence for the presence of Sergentomyia (Sergentomyia) pondicherriensis and Sergentomyia (Sergentomyia) dentata in the country

Gajapathy, K; Surendran, S.N. (Academic Journals Inc, 2011)

Leishmaniasis, mainly a zoonotic disease vectored by sand flies, emerges as major public health concern in Sri Lanka. The role of the old world sandfly genus Sergentomyia in the disease transmission is emphasized in recent ...
Predatory efficacy of culex (Lutzia) fuscanus on mosquito vectors of human diseases in Sri Lanka

Surendran, S.N.; Jude, P.J; Thavaranjit, A.C; Eswaramohan, T; Vinobaba, M; Ramasamy, R (The American Mosquito Control Association, Inc., 2013-06)

Larvae of Culex (Lutzia) fuscanus were collected from ovitraps in a natural breeding site. Collected larvae were used to establish a self-mating colony, and larval progeny were then used to determine their predatory efficacy ...
Report of the presence of phlebotomus (phlebotomus) salehi mesghali in Sri Lanka: A potential cutaneous leishmaniasis vector

Gajapathy, K; Surendran, S.N. (BioMed Central Ltd, 2012)

Cutaneous leishmaniasis (CL) is emerging as a serious public health threat in Sri Lanka and more than 2000 cases have been reported during the past nine years. The parasite responsible for CL has been identified as Leishmania ...
Strain gradient influences on apparent dependences of hydrogen diffusion coefficients on hydrogen content in the Pd81Pt19H n system

Kandasamy, K; Tong, X.Q; Lewis, F.A (Elsevier B.V., 1992)

Consolidating studies are reported of 'uphill hydrogen diffusion' effects produced by lattice strain gradients during hydrogen permeation through tubular membranes of a Pt81Pt19 alloy at 25 degrees C. Hydrogen permeation ...
Efficient hybrid polymer/TiO2 solar cells using a multilayer structure

Ravirajan, P.; Green, A.; Haque, S.A.; Durrant, J.R.; Bradley, D.D.C.; Nelson, J. (Elsevier B.V., 2004)

This study focuses on systems consisting of high hole-mobility MEHPPV based polymers or a fluorene-bithiophene co-polymer in contact with different nanocrystalline TiO2 films. We use photoluminescence quenching, time of ...
Hybrid polymer/zinc oxide photovoltaic devices with vertically oriented ZnO nanorods and an amphiphilic molecular interface layer

Ravirajan, P.; Peiró, A.M.; Nazeeruddin, M.K.; Graetzel, M.; Bradley, D.D.C.; Durrant, J.R.; Nelson, J. (Elsevier B.V., 2006-04)

We report on the effect of nanoparticle morphology and interfacial modification on the performance of hybrid polymer/zinc oxide photovoltaic devices. We compare structures consisting of poly-3-hexylthiophene (P3HT) polymer ...
Efficient charge collection in hybrid polymer/ TiO2 solar cells using poly(ethylenedioxythiophene)/polystyrene sulphonate as hole collector

Ravirajan, P.; Bradley, D.D.C.; Nelson, J.; Haque, S.A.; Durrant, J.R.; Smit, H.J.P.; Kroon, J.M. (Elsevier B.V., 2005-04)

We report a study of the optimization of power conversion efficiency in hybrid solar cells based on nanostructured titanium dioxide and a poly[2-(2-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV) based conjugated ...
The influences of induced elastic fields on permeation of hydrogen in palladium and palladium alloys

Kandasamy, K; Lewis (Elsevier B.V., 1997)

Recent hydrogen permeation studies in Palladium and Palladium alloys have provided definite evidence for the influence of diffusion induced elastic stress on permeation processes. Such influence will introduce an important ...
Hybrid nanocrystalline TiO2 solar cells with a fluorene-thiophene copolymer as a sensitizer and hole conductor

Ravirajan, P.; Haque, S.A.; Durrant, J.R.; Poplavskyy, S.A.; Bradley, D.D.C.; Nelson, J. (Elsevier B.V., 2004-02)

The charge separation and photovoltaic properties of TiO2/polymer hybrid structures was reported. As such, efficient photoinduced charge transfer was observed from a fluorene-thiophene copolymer to the TiO2 film, while ...
The interaction of titanium films with water vapour over a wide range of pressures and exposures

Kandasamy, K; Surplice, N.A (Elsevier B.V., 1982)

The changes of work function phi and resistance R were studied when titanium films were exposed to water vapour at pressures p from UHV to 1.5 Torr and exposures q from 0-104 Torr s. The work function was reduced by ...
Influences of self-induced stress on permeation flux and space-time variation of concentration during diffusion of hydrogen in a palladium alloy

Kandasamy, K (Elsevier B.V., 1995-06)

The nature of hydrogen diffusion in a tubular membrane of a Pd81Pt19 alloy is discussed. The effect of self-induced stress on (a) the space-time variation of hydrogen concentration and (b) the diffusion flux in the steady ...
The interaction of titanium films with oxygen over a wide range of pressures and exposures

Kandasamy, K; Surplice, N.A (Elsevier B.V., 1980)

The interaction of titanium films with oxygen has been studied by observing their change of resistance R and workfunction phi over the range of gas pressures from UHV to 5 Torr and exposures from 0-106 Torr s. The changes ...

Now showing items 141-160 of 655

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