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: Profil Gula Sederhana dan Oligosakarida Daun Kolesom (Talinum triangulare (Jacq.) Willd) Hasil Pemupukan Organik pada Musim Hujan.
Abstrak: Waterleaf (Talinum triangulare (Jacq.) Willd) is one of tropical plant and has long been used as herbs and vegetables. It contains pectin which is soluble dietary fiber component and performs ability to reduce cholesterol and LDL level in blood. The aim of this research was to study the effect of organic fertilization results on mono- and oligosaccharides profile of waterleaf at wet season. The organic fertilizers were cow manure (CM), rock phosphate (RP), and rice-hull ash (HA). There were four combination of treatment: RP+HA, CM+HA, CM+RP, and CM+RP+HA, also control (no-fertilizer). The result of this research shows that the highest monosaccharides was the waterleaf of control (1025.79 mg/100 g dry basis); the highest oligosaccharides was the waterleaf of CM+RP+HA fertilization (87.61 mg/100 g dry basis); and the highest total carbohydrates was the waterleaf of no-fertilization (1365.20 mg/100 g dry basis). The organic fertilization did not significantly affect the mono-, oligosaccharides, and total carbohydrates in waterleaf (p>0.05).
Keyword: Talinum triangulare (Jacq.) Willd, stachyose, raffinose, organic fertilizers

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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