4.Journals Published in Sri Lanka
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Item Characterization of soil physical properties in Andigama series in relation to coconut root growth(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1996) Vidhana Arachchi, L.P.; Mapa, R.B.; Yapa, P.A.J.; Somapala, H.Item Soil water dynamics in alley cropping systems in the dry zone of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2001) Keerthisena, R.S.K.; Mapa, R.B.; Yapa, P.A.J.Item The heritability of raw rubber properties in a Hevea population(Rubber Research Institute of Sri Lanka. Agalawatta, 1997) Yapa, P.A.J.; Fernando, D.M.; Wickramasinghe, W.N.; Peiris, B.M.S.G.The heritability of raw rubber properties in a HEVEA population was studied and it was found to be low in the case of the population investigated. However some useful correlations between certain properties such as Wallace Plasticity, colour and mooney viscosity were observed.Item Need for uniformity in properties, novel uses challenges ahead for NR(Rubber Research Institute of Sri Lanka. Agalawatta, 1985) Yapa, P.A.J.Item Coir. a versatile raw material to produce stationary media for biological wastewater treatment systems(Rubber Research Institute. Agalawatta, 2007) Kudaligama, K.V.V.S.; Thurul, W.M.; Yapa, P.A.J.Item Wastewater treatment in rubber industry with special emphasis on anaerobic systems(Rubber Research Institute. Agalawatta, 2007) Kudaligama, K.V.V.S.; Yapa, P.A.J.Item Manufacture of low protein natural rubber (LPNR) by pineapple juice (or Bromelain) treatment of Hevea latex(Rubber Research Institute of Sri Lanka. Agalawatta, 1995) Yapa, P.A.J.Item Accumulation of free proline in bark and latex of Hevea brasiliensis affected by brown bast(Rubber Research Institute. Agalawatta, 1986) Wickramasinghe, S.I.; Yapa, P.A.J.; De Soysa, T.V.W.Free proline accumulation in clone RRIC 101 of Hevea brasiliensis was investigated. The bark and the latex samples collected from both healthy and brown bast effected trees were analysed for free prline content. The average bark proline concentration/unit present in the brown bast trees was found to be considerable higher (P = 0.10) than that of healthy trees. The accumulation of free proline in latex was found to be significant in brown bast trees.Item Serum protein patterns in the healthy and brown bast affected trees of Hevea(Rubber Research Institute. Agalawatte, 1985) Prematillake, S.P.; Yapa, P.A.J.; Bamunuarachchi, A.Serum protein patterns of healthy and brown bast affected Hevea trees of six clones viz, RRIC 7, RRIC 100, RRIC 101, RRIM 600 and PB 86, were investigated. Total protein content in serum decreased noticeably in all six clones when affected by brown bast, the highest reduction being 50perc. in PB 86. Gel electrophoretic separation of serum proteins complemented these findings, with the disappearence of a number of bands and reduced intensity of the remaining bands. Protein content at different heights showed a high degree of reduction extending upwords from the tapping panel. Proteins are indicative of the spread of brown bast to neighbouring tissues at varying degrees although they may not in a noticeable changes in external appearence or in latex yields.Item The preparation and properties of low nitrogen constant viscosity rubber(Rubber Research Institute. Agalawatta, 1975) Yapa, P.A.J.
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