Ceylon Journal of Science (Biological Sciences)
Permanent URI for this collectionhttps://dl.nsf.gov.lk/handle/1/7565
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Item The genus Axinandra - Melastomataceae. a missing link in Myrtales?(University of Peradeniya. Peradeniya, 1972) Meijer, W.Item Emilia (Compositae) in ceylon(University of Peradeniya. Peradeniya, 1972) Fosberg, F.R.Item Critical notes on the compositae of Ceylon(University of Peradeniya. Peradeniya, 1972) Grierson, A.J.C.Item Histidine decarboxylation in the Halophile Dunaliella salina(University of Peradeniya. Peradeniya, 1972) Wickramasinghe, R.H.; Le Gal, Y.Item On some aspects of the parasites of Ceylonese fresh water crabs(University of Peradeniya. Peradeniya, 1972) Kannangara, D.W.W.Item A review and revision of the systematics of the genera Hydroides and Eupomatus together with an account of their phylogeny and Zoogeography(University of Peradeniya. Peradeniya, 1972) Pillai, T.G.Item Annelida polychaeta from the Philippines and Indonesia(University of Peradeniya. Peradeniya, 1965) Pillai, T.G.Item The food of the tadpoles of Rhacophorus cruciger cruciger (Blyth)(University of Peradeniya. Peradeniya, 1965) Costa, H.H.; Balasubramaniam, S.1) Examination of food in the alimentary canal of Rhacophorus tadpoles showed that the plankton algae present in the water were ingested without discrimination. @0 Chlorella was the dominant item in the food. Other algae constituted a small fraction. The ingested food also contained a large amount of debris. 3) Except for the diatoms and fragments of green filamentous algae, most of the ingested algae passed out undigested. 4) Experiments showed that starved tadpoles fed on filaments of Spirogyra and the cells of these were partly digested in the alimentary canal.Item Responses of freshwater animals to sodium cyanide solutions III. tadpoles of Rana temporaria(University of Peradeniya. Peradeniya, 1965) Costa, H.H.Experiments with tadpoles of Rana temporaria with sodium cyanide solutions gave generally similar results to those with fish and Gammarus. Tadpoles, however, are less sensitive than than fish but more sensitive than gammarus. The response limit for frog tadpoles is about 0.00001N. Changes of temperature, pH and dissoved oxygen had effects on their reactions similar to those seen with fishes and GammarusItem Responses of freshwater animals to sodium cyanide solutions II. Gammarus pulex(University of Peradeniya. Peradeniya, 1965) Costa, H.H.Experiments with Gammarus puler with cyanide solutions gave generally similar results to those given by experiments with fish. These animals however, appeared to be less sensitive than fish. The response limit for Gammarus, for sodium cyanide, is about 0.0001N. Addition of thiosulphate to sodium cyanide reduce the toxicity but unlike with fish, the reactions are accelerated. Increasing the temperature, increasing or decreasing the pH and lowering the oxygen content had effects on their reactions similar to those seen in fishes