Browsing by Author "Ratnasooriya, W.D."
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Item Absence of synchronization either in defaecation or urination of the Sri Lankan elephants(Elephas maximus maximus) in captivity(1994) Ratnasooriya, W.D.; Molligoda, P.S.; Molligoda, W.H.M.The main aim of this study was to examine whether synchronization in defaecation is present in the Sri Lankan elephant as is reported for the African elephants. The other secondary aims were to investigate whether such a phenomenon exists with respect to urination and to obtain baseline data related to these two phenomena. The study was conducted at the National Zoological Gardens of Sri Lanka using eight captive elephants. The results show that there is no synchronization either in defaecation or in urination. Furthermore, the study shows that the Sri Lankan elephant, in captivity, defaecates approximately 13 times per day, each episode lasting for about 33 sec. About 5 faecal boluses are passed at each defaecation episode and each single bolus weighted approximately 1.5kg. Amoung the parameters monitored and computed, a gender defference was seen only in the weight of the boluses, where the weight was significantly lower in the females in comparison to the males. On the other hand, the elephants urinated approximately 10 times per day, each episode having a mean duration of about 22 sec.Item Activity-directed fractionation of Pleurotus ostreatus in the search for Analgesics(2008) Vasudewa, N.S.; Abeytunga, D.T.U.; Ratnasooriya, W.D.Item An assessment of potential healt benefits of Sri Lankan black tea by studying its bioactivitiesFernando, S.P.; Ranatunga, A.R.; Madhubashini, P.P.; Ratnasooriya, W.D.Item An eco-ethological study of the false vampire bats Megaderma lyra and Megaderma spasma in Sri LankaNandasena, M.; Yapa, W.B.; Ratnasooriya, W.D.Item An investigation of in vivo antimalarial activity of black tea brew of Camellia sinensis L. O. kuntze in mice(Tea Research Institute. Colombo, 2007) Ratnasooriya, W.D.; Jayasinghe, C.D.; Udagama - Randeniya, P.V.Item Anti inflammatory activity of leafs of Ixora cdccinea:use of in vitro and in vivo assays for activity-directed fractionation(2008) Kumara, R.R.; Nanayakkara, A.A.; Deraniyagala, S.A.; Ratnasooriya, W.D.; Handunnethi, S.M.Item Anti-inflammatory activity effects of methanolic leaf extract of Ixora coccinea in rats.(2009) Handunnetti, S.M.; Kumara, P.R.; Deraniyagala, S.A.; Ratnasooriya, W.D.Item Anti-inflammatory activity of rhizome of Alpinia calcaraia(2008) Kaiaiarashi, K.; Kumara, R.R.; Ratnasooriya, W.D.; Handunnetti, S.M.Item Antigestational effects of Icon. a pyrethroid insecticide on mid pregnancy of rats(University of Colombo. Colombo, 2004) Ratnasooriya, W.D.; Ratnayake, S.S.K.; Jayatunge, Y.N.A.Item Antinociceptive activity of Pleurotus cystidiosus, an edible mushroom in rats(2008) Kudahewa, D.D.; Abeytunga, D.T.U.; Ratnasooriya, W.D.Item Antinociceptive activity of Pleurotus ostreatus, an edible mushroom in rats(2007) Vasudewa, N.S.; Abeytunga, D.T.U.; Ratnasooriya, W.D.Item Antioxidant activity of Caryota urens L. (Kithul) sap(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2012) Ranasinghe, P.; Premakumara, G.A.S.; Wijayarathna, C.D.; Ratnasooriya, W.D.Item Antipyretic activity of Sri Lankan black tea (Camellia sinensis)(Tea Research Institute. Talawekelle, 2007) Ratnasooriya, W.D.; Fernando, T.S.P.; Senevirathna, C.D.W.Y.Item Antireproductive effects in male rats exposed to methamidophos(University of Peradeniya. Peradeniya, 1995) Peiris, L.D.C.; Jayatunga, Y.N.A.; Ratnasooriya, W.D.Item The body condition of Sri Lankan domesticaded elephants (Elephas maximus maximus)(University of Peradeniya. Peradeniya, 1998) Godagama, W.K.; Wemmer, C.; Ratnasooriya, W.D.The body condition of domesticated Sri Lankan elephants has not been scientifically evaluated although many believe that it is poor. The objective of this study was to evalute the body condition of domesticated elephants in Sri Lanka using an index developed by Wemmer and Krishnamurthy (1992). This method of assessing relies on visual assessment and numerical scoring of six criteria (temporal depression, scapula, thoracic region, flank area, lumbar vertibrae and pelvic bone) resulting in a scale of 0-11. The study was conducted between 1st April 1993 and 1st April 1994 in 13 administrative districts using 140 domesticated elephants. The results show that the mean body condition index of the present day domesticated elephants is 6.95+/- 0.26 points (mean +/- SEM). MAles had significantly lower body condition index (6.63+/-0.22 points) than that of females (7.3+/-0.21points) and there was no significant (r=0.398, p=1, n=140) correlation between the age and the body condition index of elephants. Further, the body condition index was not significantly different between the elephants which were owned by private individuals or temples and dewales (p=0.71) and maintained by the mahouts or the owners(p=0.21)Item Distribution, abundance and roosting preference of fruit bats (Megachiroptera) in Sri Lanka(1998) Digana, P.M.C.B.; Yapa, W.B.; Randeniya, P.V.; Ratnasooriya, W.D.Item DNA fingerprints of the Asian elephant in Sri Lanka Elephas maximus maximus using multilocus probe 33.15 (Jeffreys)(National Science Foundation:Colombo, 2004) Vendebona, H.; Gunasekera, M.B.; Ratnasooriya, W.D.; Goonesekere, N.C.W.; Kodikara, D.S.Item Ecological investigation of the macro- and Micro- habitat selection of small mammals in SinharajaRatnasooriya, W.D.; Wijesinghe, M.Item Ecology and biology of bats in Sri Lanka.Digane, P.M.C.B.; Ratnasooriya, W.D.; Randeniya, P.; Yapa, W.Item Effect of acetylcholine on the contractility of the vas deferens and epididymis and on fertility of male rats(National Science Council:Colombo, 1986) Ratnasooriya, W.D.
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