http://dr.lib.sjp.ac.lk/handle/123456789/751 Thu, 23 Apr 2026 10:24:37 GMT 2026-04-23T10:24:37Z http://dr.lib.sjp.ac.lk/handle/123456789/784 Effects of Orchiectomy on Exploratory Behaviour of Rats Ratnasooriya, W.D.; Caldera, H.S. This study was designed to assess whether the testes influence the exploratory behaviour of rats. The results show that orchiectomy parameters of exploratory behaviour, namely the number of head dips, locomotory significantly impaired three activity and number of rears, when evaluated using the hole-board technique. The fourth parameter tested, the time spent head dipping however remained unaltered. These fidings suggest that .some [actor]: secreted by testes influence exploratory behaviour. Mon, 01 Jan 1990 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/784 1990-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/783 Food Partitioning in Four Species of Penaeid Prawns in the Bolgoda Lagoon Sri Lanka Jinadasa, J. Penaeid prawns of the Bolgoda Lagoon feed on Carldina spp, clams, Harpacticoid spp, Nerine and Nereis spp fish larvae, diatoms, green leafy matter and detritus. Their frequency of occurance and the number of crops containing a particular diet varies from species to species studied. The overlap co-efficient of food between two species of the same genus is greater than that of two species of two different genera. vacuity index of M. ensis indicated seasonality in feeding. The distribution of prawns in the lagoon has a direct relationship to the benthic fauna fiand ora. Mon, 01 Jan 1990 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/783 1990-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/782 Effect of Carbachol on Fertility of Male Rats When Administered Locally to Epididymis Ratnasooriya, W.D. This study examines the effect of carbachol, a potent cholinoceptor agonist drug, on fertility of male rats, when administered to epididymis using stlastic formulations, in the form of rods. 10% and 25% carbachol rods were found to be toxic, and resulted in death within 25 min. On the other hand, 5% rods were tolerable. These rods significantly reduced sperm numbers both in the cauda epididymis and ejaculate but failed to Impair fertility. Libido (sexual desire) remained essentially unaltered. In organ bath experiments, carbachol induced rhythmic contrations in isolated vasa deferentia and cauda epididymal tubules in a ' dose-related manner. Mon, 01 Jan 1990 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/782 1990-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/781 Theory of the Determination of Refractive Index by the Total Internal Reflection Method Tantrigoda, D.A. Mon, 01 Jan 1990 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/781 1990-01-01T00:00:00Z