Judul: Kandungan Serat Pangan Daun Kolesom (Talinum Triangulare (Jacq.) Willd) pada Budidaya dengan Pemupukan Organik dan Anorganik
Abstrak: Water leaf (Talinum triangulare (Jacq.) Willd is one of tropical vegetables which widely grown in Indonesia and has long been used as traditional medicinal plant. Water leaves are sticky presumably due to its pectin content. Pectin is soluble dietary fiber component that performs ability to reduce LDL level in blood. The aim of this research is to study the effect of organic and inorganic fertilization to the level of TDF, IDF, SDF, and pectic substances in water leaf vegetable. This research was conducted in four phases: sample cultivation, sample preparation, chemical analysis, and data analysis. This research used five samples cultivated with organic fertilizers and five samples cultivated with inorganic fertilizers. Samples were dried using drying oven for 17 hours at 60 C. The result shows that TDF, IDF, and SDF level of organic and inorganic water leaf vegetables are significantly different with each p-value of 0,026; 0,022; and 0,215 respectively. Meanwhile, the level of pectic substance is not significantly different for both treatments with p-value of 0,718. Overall result shows that inorganically cultivated samples contain higher dietary fiber and pectic substance than organically fertilized samples. IDF content in water leaf vegetable is higher than its SDF content. It means that dietary fiber in water leaf can help the intestinal health. However, pectic substance contents, which is also part of SDF, are relatively similar in all samples and did not affected by the cultivation treatment. It indicates that water leaf vegetable has the potential to be developed as functional food.
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Judul: Analisis Perbandingan Kandungan Serat Pangan Daun Kolesom (Talinum triangulare (Jacq.) Willd) dengan Pemupukan Organik dan Anorganik pada Perbedaan Musim
Abstrak: Waterleaf (Talinum triangulare (Jacq.) Willd) is one of tropical plant and has long been used as herbs and vegetable in daily menu. Its leaves are fleshy and sticky, presumably due to the high pectin content. Pectin is soluble dietary fiber component that performs ability to reduce cholesterol and LDL level in blood. The aim of this research was to study the effect of organic and inorganic fertilization as well as the cultivating season to the level of TDF, IDF, SDF and pectic substance in waterleaf. The research was conducted in five steps, i.e. cultivation, sample preparation, chemical analysis, data analysis, and meta analysis. The samples were ten waterleaf cultivated in dry season with organic and inorganic fertilizations, each in five different concentration of fertilizers. The TDF, IDF, SDF, and pectic substance in waterleaf cultivated with organic fertilizer were 40.52 2.72; 27.12 1.54; 13.40 1.68; and 6.58 0.74 g/100 dry basis respectively, while in waterleaf with inorganic fertilizer were 42.57 1.84; 27.12 0.75; 15.41 1.85; and 6.01 0.35 g/100 g dry basis respectively. All parameters, except IDF, were significantly different (p < 0.05). The meta analysis showed that the dry season waterleaf contain less TDF and IDF, and more SDF and pectic substance than the wet season waterleaf do (p < 0.01). The SDF and pectic substance content of the dry season waterleaf are relatively higher compared to other vegetables. It indicates that waterleaf is potential to be developed as functional food for lowering cholesterol and LDL level in blood.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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