Science Symposium - Faculty of Science: Recent submissions

Now showing items 101-120 of 163

Critical micelle concentration (CMC) of SDS micelles at different pH, and added salt concentrations

Kulasooriya, E.S.; Gangabadage, C.S. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

Detergents are amphipathic molecules that consisting of hydrophobic tail and a hydrophilic head group. They can self aggregate to form micelles at a threshold concentration called the critical micelle concentration ...
A Study on l-Nitro-2-Napthyl Acetate as a Chromogenic substrate for the determination of Fluoride ions in water

Rathnayaka, S.S.K.; Dissanayaka, A.S. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

0- aryl esters are known to be sensitive to fluoride ions in organic medium. Based on this property, a kinetic method for the spetrophotometric determination of fluoride ion has been investigated. This studies has been ...
Incidences of root-knot nematodes on selected three leafy-vegetable species in Hambantota district and nematicidal properties of aqueous extract of ripe “Goraka” fruits.

Gunasekara, W.M.D.F.; Premachandra, W.T.S.D. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

In the first part of this research project, Meloidogyne infestations on three leafy-vegetable species, i.e., Centella asiatica, “Gotukola”; Ipomea aquatica, “Kangkung”; Alternanlhera sessilis, “Mugunuwenna” in Hambantota ...
Development of modified carbohydrate adhesives

Sandamali, H.M.N.; Panamgama, L.A. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

A process for manufacturing maize starch based high quality and environmental friendly adhesives was investigated by using borax and poly vinyl alcohol as modifiers. Maize starch was denatured by oxidation with Hydrogen ...
Investigation of the malpractices of pesticide application on the population density of Spodoptera litura (Fabricius) and Cassida circumdata (Herst) in Alternanthera sessilis (L)

Fernando, l.D.K.L.; Wickramasinghe, M.G.V. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

Alternanthera sessilis is highly nutritious cheep food item, among the people in Sri Lanka. This is consumed as a raw food or partially cooked meal. Spodoptera litura (Fabricius) and Cassida circumdata (Herst) are the ...
Identification of key insect pollinators and their active pollinating period of the day on selected vegetable plants in mixed cropping system

Silva, M.M.H.; Wegiriya, H.C.E. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

Insects are important as main pollinators of many agricultural crops such as vegetables and fruits. More than 3000 species of insects are important as pollinators and among them insects belong to order Hymenoptera and ...
Initial study on removal of organic pollutants from contaminated water by using coconut shell based activated carbon

Dananjaya, S.H.S.; Edussuriya, M. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

The ability of coconut shell based activated carbon to remove resorcinol (benzene -1 ,3 - diol),a common pollutant from contaminated water has been investigated. Activated carbon was produced using coconut shells as the ...
Investigation of Aquatic Macrophytes Preference by Macro-invertebrates and Comparison of Physico-chemical and Biological Parameters of Godapitiya and Kadawara Tanks in Southern Province.

Nishshanka, N.M.B.G.; Guruge, W.A.H.P. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

Macrophytes are very important component in lentic as well as lotic systems. Macro-invertebrates are directly influenced by macrophytes as they provide refuge and food for macro-invertebrates directly or indirectly. ...
Determination of human impact and environmental factors that effect on the distribution of mollusks in Lunuwila Ela, Galle

Udayantha, H.M.V.; Munasinghe, D.H.N. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

Molluscans are one of the most diverse and dominant animal groups among macroinvertebtares. However due to different reasons many species are under high rate of extinction. For conservation purposes, it is important ...
Manipulation of RECK (Reversion-inducing Cystein-rich proteins with Kazal motifs) in Human Vascular Smooth Muscle Cells and Human Vascular Endothelial Cells

Chandana, E.P.S.; Yoshida, Yoko; Noda, Makoto (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

Previous studies have indicated the importance of the membrane-anchored MMP regulator RECK in several events during mouse development, including maintenance o f tissue integrity, angiogenesis, myogenesis, and chondrogenesis. ...
Study of major insect pest in mushroom farming and effects of selected biological repellants on its survival.

Kulawansa, P.W.L.P.; Wegiriya, H.C.E. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

Many people consume mushrooms because of their nutritional and medicinal properties, in addition to their culinary appeal. Oyster mushroom Pleurotus ostreatus is a good choice to begin the mushroom cultivation, because ...
Mal practice of pesticides and development of resistance in insect pests.

Senewirathne, S.H.S.; Wickramasinghe, M.G.V. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

The chemical control of pesticide is the most popular pest controlling method in Sri Lanka, but it causes many environmental problems as well as health hazards such as kidney failure, cancers, nervous disorders, pest ...
A quality assessment of the Pattiyapola wewa by using physical, chemical, biological parameters.

Wijesundara, W.M.S.R.; Amarasinghe, N.J. De S. (Department of Zoology, University of Ruhuna Matara, Sri Lanka., 2009-12)

The most common fresh water habitats are the irrigation tanks of which there are over 10000 in Sri Lanka. The focus of the present study was the Pattiyapola wewa is a one of the man made tanks in the Hambantota district ...
A low cost automated device to release a certain volume of liquid

Ranatunga, E.M.; Dharmaratna, W.G.D. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

A simple automated device have been designed and constructed in order to release a predetermined amount of liquid from a container. This preliminary study indicates that the device releases water with an accuracy of ± ...
An investigation on cauda storage of sperm in hamster epididymis

Sudarshani, K.A.M.; Wegiriya, H.C.E.; Samayawardhena, L.A. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

Most of the scientific research on epididymal functions of epididymis deal with epididymal sperm maturation but not on sperm storage. Therefore, the present study was undertaken to determine the sperm storage time using ...
Effect of aqueous leaf extract of neem (Azadirachta indica) on different age groups of second stage-juveniles of Meloidogyne incognita

Premachandra, W.T.S.D.; Weeraratne, H.P. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

The effect of aqueous neem leaf extract on the survival of second-stage juveniles at four different age groups, i.e., one, three, five and seven-day-old, second and the egg hatchability of Meloidogyne incognita was ...
Point-Mutation Effects on Charge-Transport Properties of DNA

Roemer, Rudolf A.; Shih, Chi-Tin; Wells, Stephen; Cheng, Yurf-Yin; Hsu, Ching-Ling (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

There is increasing evidence that DNA can support a considerable degree of charge transport along the strand by hopping of holes from one base to another, and that this charge transport may be relevant to DNA regu ation, ...
Analysis of relative growth patterns and sexual dimorphism of selected morphometric and meristic characters of Macrobrachium rosenbergii dacqueti (Sunier 1925)

Gamage, N.T.G.; Munasinghe, D.H.N. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

Freshwater prawn Macrobrachium rosenbergii dacqueti is one of the most economically important crustacean species cultured within its’ natural distribution and beyond. This study was conducted to estimate the sexual ...
Study on the active time period, spatial distribution and nectar plants of recorded butterfly species in Kiralakelle Wetland in Matara District.

Wijekoon, W.M.C.D.; Wegiriya, H.C.E.; Bogahawatte, C.N.L. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

Although, butterflies are a group of charismatic insects, their behaviors have been rather poorly documented in Sri Lanka. Thus, present study investigated the active time period, spatial distribution in different strata ...
A Field survey on ant species in four selected locations in Wellamadama premises of the University of Ruhuna.

Wijekoon, W.M.C.D.; Bogahawatte, C.N.L.; Senevirathna, J.D.M. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2009-12-23)

Ants are very common group of insects and constitute up to 20% of the animal biomass in tropical region. About 65 genera, 12 subfamilies and 210 species were recorded from Sri Lanka. Majority of ants belongs to the ...

Now showing items 101-120 of 163

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