Judul: Kandungan curcin, komposisi kimia, retensi bahan kering, kalsium dan fosfor bungkil biji jarak pagar (Jatropha curcas) terdetoksifikasi
Abstrak: The rise of Jatropha curcas processing factor for biodiesel causes an increase in production of Jatropha curcas mela. Jatropha curcas meal has high protein content, 53-58% (Becket and Makkar, 1998) and it is potential to substitute soya bean meal that is commonly used polutry diets. Toxic substances present in Jatropha curcas meal such as curcin and phorbolester reduced its use as feed. Therefore, it is realized to detoxify toxin present in Jatropha curcas meal.
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Judul: Pengaruh Perlakuan Kimiawi dan Biologis terhadap Penyusutan Bahan, Kandungan Antitripsin, Lektin dan Nutrien Bungkil Biji Jarak Pagar (Jatropha curcas L.)
Abstrak: The Jatropha curcas meal is by product of Jatropha curcas oil production and contain high amount of nutrient (56-68% protein). The problem in using of Jatropha curcas meal as feed is its antinutritive content and toxic compounds such as lectin (curcin) and trypsin inhibitor. This experiment was conducted to evaluate the effectiveness of chemical and biological methods in decreasing or eliminating antinutrient content and to know the change of nutrient content due to processing of Jatropha curcas meal. This research consisted of four treatments : P0 (control, non treated meal), P1 (methanol 90% extraction, with the proportion of meal and methanol was 1:4), P2 (fermentation using Rhizopus oryzae) and P3 (fermentation using Trichoderma viride). The parameters observed were weight loss, trypsin inhibitor, lectin activity and nutrient content. The data were analyzed with descriptive analysis. The results showed that chemical and biological treatments decreased the weight with the values P1 (3.18%), P2 (14.44%) and P3 (3.7%). The results showed that fermentation using Rhizopus oryzae was the most effective in decreasing the activity of trypsin inhibitor (67.95%). However, this treatment decreased protein content (9.39%), increased crude fiber (35.73%) and it did not influence lectin activity. The fermentation using Trichoderma viride was the most effective in degrading lectin activity with the value of 50% compared to the untreated meal. The conclusion of this experiment is that fermentation Jatropha curcas meal using Rhizopus oryzae could decrease the trypsin inhibitor up to 67.95% and the fermentation Jatropha curcas meal using Trichederma viride could decrease lectin activity up to 50%.
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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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