4.Journals Published in 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 Proteolytic action of bromelain on Hevea latex(Rubber Research Institute of Sri Lanka. Agalawatte, 1995) Yapa, P.A.J.Item Some aspects of biochemical changes due to maturation of acid and papain treated Hevea latex(Rubber Research Institute. Agalawatta, 1998) Dissanayake, W.; Yapa, P.A.J.Biochemical changes that occur due to maturation of acid and papain treated Hevea latex were investigated. An increase in bacterial population in latex of both acid and papain treated, was significantly higher than that in acid treated latex. Higher microbial activity correlated with decreases in carbohydrate and amino acid levels in serum. Maturation of papain treated latex, enhances protein digestion and reduction in ash content without any adverse effect on major raw rubber properties.