Journal of the Rubber Research Institute of Sri Lanka
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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.Item The use of papain as a biological coagulant for natural rubber latex(Rubber Research Institute. Agalawatta, 1973) Nadarajah, M.; Yapa, P.A.J.; Balasingham, C.G.; Kasinathaii, S.Item Proteolytic action of bromelain on Hevea latex(Rubber Research Institute of Sri Lanka. Agalawatte, 1995) Yapa, P.A.J.Item Effect of storage hardening on the PRI of chemically treated rubber(Rubber Research Institute. Agalawatta, 1972) Yapa, P.A.J.; Karunaratne, S.W.Item Some aspects of phenolic discolouration in natural rubber(Rubber Research Institute of Sri Lanka. Agalawaththa, 1976) Yapa, P.A.J.Item Possibility of treating rubber factory wastewater in biological reactors using media with low specific surface area(Rubber Research Institute. Agalawatta, 2007) Kudaligama, K.V.V.S.; Thurul, W.M.; Yapa, P.A.J.Item Enzyme deproteinization of hevea latex 111 clonal suitability for papain treatment(Rubber Research Institute. Colombo, 1979) Yapa, P.A.J.; Lionel, W.A.Item Enzyme deproteinization of hevea latex ii the use of papain in Rss manufacture(Rubber Research Institute. Colombo, 1979) Yapa, P.A.J.; Lionel, W.A.