Browsing Department of Chemistry by Issue Date

Now showing items 1-20 of 72

Preparation and characterization of edible soy protein films

Liyanage, Duminda Shiromalee (2001)
Presence of unsaturated sphingomyelins and changes in their composition during the life cycle of the moth Manduca sexta

Abeytunga, D.T.U.; Glick, J.J.; Gibson, N.J.; Oland, L.A.; Somogyi, A.; Wysocki, V.H.; Plot, R. (2001)

NMR and electrospray ionization tandem mass spectrometry were used to show for the first time the presence of sphingomyelins in extracts of the tobacco hornworm Manduca sexta (Lepidoptera). The sphingosine in the ceramide ...
Antibacterial activities of volvariella volvacea

Perera, W.A.S.W.; Abeytunga, D.T.U.; Wijesundara, R.L.C. (2001)

: Extracts of twenty- one basidiomycctc fungi were tested against the bacteria, Staphylococcus aureus, Streptococcus. Pseuciornor~c~s mruginosa, Escherichia coli, and Klebsiella. Among them Volvariella oolvacea showed ...
Phototransposition Reactions of Methyl-Substituted Benzotrifluorides: Proof of the Role of Trifluoromethyl-Substituted Carbon

Costa, M.D.P. De; Pincock, J. (2002)

Irradiation in acetonitrile of any one of the six isomers of dimethylbenzotrifluoride 8 resulted in efficient photoisomerization to the others. The dominant processes in these phototransposition reactions divides the isomers ...
Preliminary Assessment of U.K. Human Dietary and Inhalation Exposure to Polybrominated Diphenyl Ethers

Harrad, R.; Halliwell, C.; Baker, S.; Wijesekera, R.D.; Hunter, S. (2004)

This study reports concentrations of BDEs 47, 99, 100, 153, and 154 in outdoor air [median SigmaPBDE (sum of BDEs 47, 99, 100, 153, and 154) = 18 pig m(-3)] in air from a range of office and home indoor microenvironments ...
Detailed studies on complexation behaviour and mechanism of fluorescence quenching of naphthalene linked hydroxamic acid with transition metal ions by UV-visible and fluorescence spectra

Costa, M.D.P. De; Jayasinghe, W.A.P.A. (Journal of Photochemistry and Photobiology A: Chemistry, 2004)

The stoichiometry of the complex formation and mechanism of fluorescence quenching of compounds 1 and 2 with Fe(III), Cu(II) and Zn(II) were carried out in great detail by spectrometric and fluoromertric methods. Complexes ...
Use Patterns and Residue Levels of Pesticides on Mukunuwenna, a Leafy Vegetable Grown in Sri Lanka

De Alwis, G.K. Hemakanthi; Wijesekera, R.D.; Jayasekera, T.A.D.N.A. K. (2006)

Intensive use of chemical imputs such as pesticides and fertilizers as a means of expanding domestic food production in Sri Lanka began in the 1960's (Abeysekera 1988). Pesticides also showed spectacular success in control ...
Simple aromatic acids and their salts in controlling the growth of Rhizoctonia solani under laboratory conditions

Abeytunga, D.T.U.; Hapuarachchi, H.S.S.; Jayasundara, W.A.; Wijesundara, R.L.C. (Ceylon J. Sci. (Bio. Sci.), 2006)

Rhizoctonia solani is a fungus pathogenic in many economically important plants. Ten aromatic acids were examined for activity against Rhizoctonia solani using poisoned food technique. All the acids were inhibitory to ...
DNA FINGERPRINTING ELICITED EVOLUTIONARY TREND OF ORAL CANDIDA TROPICALIS ISOLATES FROM DIVERSE GEOGRAPHIC LOCALES

Dassanayake, R.S.; Samaranayake, Y.H.; Samaranayake, L.P. (2006)

Purpose: To study molecular profiles of oral Candida tropicalis isolates from five different geographic locales to determine the molecular diversity, clonality and evolutionary trends of this opportunistic pathogen. Methods: ...
In situ determination of copper (II) and cobalt (II) using adsorptive cathodic stripping voltammetry with hydroxamic acid modified carbon paste electrode

Senthilnithy, R.; Costa, M.D.P. De; Gunawardhana, H.D. (2006)
Absolute pKa determination for N-phenylbenzohydroxamic

Senthilnithy, R.; Gunawardhana, H.D.; Costa, M.D.P. De; Dissanayake, D.P. (Journal of Molecular Structure, 2006)

Ab initio calculations on isomers of N-phenylbenzohydroxamic acid derivatives and their deprotonation process have been performed. Gas phase geometries were optimised using complete basis set method, CBS-QB3 as implemented ...
activity of Pleurotus Ostreatus, an edible mushroom, in rats

Vasudewa, N.S.; Abeytunga, D.T.U.; Ratnasooriya, W.D. (2007)

The antinociceptive potential of Pleurotus ostreatus. (Jacquin: Fries) P. Kummer (Tricholomataceae) was investigated in rats (doses used: 125, 500, and 1000 mg/kg). Male rats and female rats in proestrous, estrous, and ...
Antioxidant and cytotoxic properties of three traditional decoctions used for the treatment of cancer in Sri Lanka.

Perera, M.G.A.N.; Soysa, S.S.S.B.D.P.; Abeytunga, D.T.U.; Ramesh, R. (Pharmacognosy Magazine, 2008)

Many plant-based treatments are being recommended for the cancer patients by traditional medical practitioners of Sri Lanka. Three such decoctions D1 (Terminalia bellerica, Terminalia chebula, Phyllanthus emblica ...
The pK value of ligands and stability constants of the complexes of Fe(III), Cu(II) Ni(II) with some hydroxamic acids: a comparative study of three diifferent potentiometric methods

Senthilnithy, R.; Costa, M.D.P. De; Gunawardhana, H.D. (2008)

The determination of ionization constants and the chelating properties exhibited by a series of derivatives of N-phenylbenzohydroxamic acid, N-phenyllaurohydroxamic acid and 1-naphmalenememylimminodiacetohydroxamic acid ...
Fluorescence quenching and bonding properties of some hydroxamic acid derivatives by iron(III) and manganese(II)

Senthilnithy, R.; Costa, M.D.P. De; Gunawardhana, H.D. (2008)

Spectrophotometric investigations of highly fluorescent metal chelating molecules are of relevance due to their potential application in novel, selective fluorescence-based sensors. Benzene and naphthalene chromophores are ...
Structural studies on the neutral glycosphingolipids of Manduca sexta. Bio Organic Chemistry

Abeytunga, D.T.U.; Oland, L.A.; Somogyi, A.; Polt, R. (2008)

Glycosphingolipids (GSLs) have been implicated as playing major roles in cellular interactions and control of cell proliferation in muticellular organisms. Moreover GSLs and other sphingolipids such as sphingomyelins, ...
Activity directed fractionation of Pleurotus Ostreatus in search of analgesics.

Vasudewa, N.S.; Abeytunga, D.T.U.; Ratnasooriya, W.D. (Pharmaceutical Biology, 2008)

Pleurotus ostreatus. (Jacquin: Fries) P. Kummer (Tricholomataceae) was subjected to an antinociceptive activity-guided fractionation procedure in order to identify the fraction having highest activity. Three extracts, ...
Inhibition of lipid peroxidation by extracts of Pleurotus ostreatus

Dissanayake, D.P.; Abeytunga, D.T.U.; Ratnasooriya, W.D.; Vasudewa, N.S. (Pharmacognosy Magazine, 2009)

Abstract: The inhibition of lipid peroxidation by Pleurotus ostreatus was established using Thiobarbituric (TBARS) assay. Three solvent extracts of P. ostreatus namely, the acetone, dichloromethane and hexane extracts were ...
An oxidized ergosterol from Pleurotus cystidiosus active against anthracnose causing Colletotrichum gloeosporioides, Mycopathologia,

Menikpurage, I.P.; Abeytunga, D.T.U.; Jacobsen, N.E.; Wijesundara, R.L.C. (2009)

This study was undertaken to study the antifungal activity of Pleurotus cystidiosus against Colletotrichum gloeosporioides. This was achieved by fractionating the mushroom, P. cystidiosus initially to acetone (A), ...
A low cost nutrient formulation with a buffer for simplified hydroponics systems

Saparamadu, J.S.; Wijesekera, R.D.; Gunawardhana, H.D.; Weerakkody, W.A.P. (2010)

The pH of the nutrient solution is a major determinant of nutrient uptake by the plants. The most suitable pH range for the plants is recognized as 5.8 - 6.5. Therefore, the pH of the nutrient solution has been adjusted ...

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