Science
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Item Studies on the biology of young grey mullet, Mugil cephalus L.(FAO of United Nations, Rome, Italy, 1976) de Silva, S.S.; Wijeyaratne, M.J.S.Item The ecology of a montane grassland in Sri Lanka. VII. Biomass production(Ceylon Journal of Science, Biological Sciences, 1983) Amarasinghe, L.D.; Pemadasa, M.A.Biomass accumulation was studied monthly on 2 montane grasslands in Sri Lanka at 900 m and 560 m alt. from June 1976 to May 1977. The upper site was a dense sward dominated by Cymbopogon nardus (65.4%), Themeda tremula (25.4%) andEulalia trispicata (10.1% of standing crop) and the lower site was a sparse sward dominated by C. nardus (68.6%) and Panicum maximum (13.9%) with somePennisetum polystachyon (7.7%). Total standing crop biomass was higher at the upper site than at the lower site and increased 4-fold at both sites over the years. Productivity estimates were 911.2 g/m² for the upper sites and 679.5 g for the lower site. There was no significant difference in the amount of C. nardus between sites, but the upper site supported a much denser sward of T. tremula accounting for the higher productivity of this site.Item Estimation of maximum sustainable fish yield and stocking densities of fish fingerlings in fresh water lakes and reservoirs(University of Malaya, Kuala Lumpur, 1982) Wijeyaratne, M.J.S.; Amarasinghe, U.S.Item Water quality criteria for pollution control(University of Malaya, Kuala Lumpur, 1982) Costa, H.H.Item n-type electrical conductivity in cuprous oxide thin films(Natural Resources, Energy and Science Authority of Sri Lanka, 1988) Siripala, W.; Kumara, K.P.Electrodeposited cuprous oxide thin films were investigated to determine whether their electrical conductivity is n-type or p-type. The experimental results based on the measurements of thermoelectric e.m.f, sheet resistance, dark and light current-voltage characteristics of Cu2O/CuxS and Cu2O/CuCNS heterojunctions reveal that the electrodeposited cuprous oxide films produce n-type electrical conductivity. These observations are in very good agreement with the previously reported n-type behavior of the electro-deposited Cu2O film electrodes in a photo-electrochemical cell.Item Effect of maturity on some chemical constituents of turmeric (Curcuma longa L.)(Natural Resources, Energy and Science Authority of Sri Lanka, 1988) Cooray, N.F.; Jansz, E.R.; Ranatunga, J.; Wimalasena, S.Item Ratoon stunting disease of sugarcane in Sri Lanka(Natural Resources, Energy and Science Authority of Sri Lanka, 1987) Jayaratne, D.L.; Widanapathirana, S.Item Some aquatic hyphomycetes from Sri Lanka(Natural Resources, Energy and Science Authority of Sri Lanka, 1984) Gunasekera, S.A.; Rukmani, M.P.R.Item Some Chemical Characteristics of Fresh and Salt-Dried Tilapia mossambica Peters(National Science Council of Sri Lanka, 1979) de Silva, S.S.; Rangoda, M.Item The distribution of Anostraca and Conchostraca (Crustacea) in the Jaffna Peninsula(The Fisheries Research Station, 1979) Selvarajah, N.; Costa, H.H.