Judul: Pembuatan Yogurt Sinbiotik Menggunakan Bakteri Asam Laktat Indigenus sebagai Pangan Fungsional Antidiare
Abstrak: Yoghurt is a product of fermented milk using lactid acid bacteria (LAB) as a starter. An indigenous probiotic LAB, Lactobacillus plantarum 2C12 and Lactobacillus fermentum 2B4, were applied in the making of functional synbiotic yoghurt with fructo-oligosaccharide (FOS) 5% as a prebiotic source. The aim of this study was to determine the best formula of functional synbiotic yoghurt as an alternative to protect human gastrointestinal against diarrhea. The best formula with the highest antidiarrheal effect was then applied with the addition of stabilizer and flavor to improve the product quality and consumer acceptance. The results showed that the synbiotic yogurt made from mixed culture L. bulgaricus, S. thermophillus, and L. fermentum 2B4 has the highest antibacterial effect in preventing Enteropathogenic Escherichia coli (EPEC) growth. Addition of 1.75% natural corn starch as a stabilizer produced optimum improvement in yoghurt consistency and minimize whey separation. Result of sensory evaluation indicated that the yoghurt with addition of 1% strawberry flavor and 0.1% vanilla flavor were ranked at first and second. Yoghurts could still good to consume after 15 days storage period at the refrigeration temperature (10oC).
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Judul: Pengaruh pemberian yogurt sinbiotik berbasis probiotik indigenus terhadap profil histologi dan kandungan Imunoglobulin A (IgA) usus halus tikus percobaan
Abstrak: Penelitian ini dilakukan untuk melihat potensi aktivitas antidiare dan imunomodulator beberapa formula yogurt dengan penambahan bakteri asam laktat indigenus (Lactobacillus plantarum 2C12 dan Lactobacillus fermentum 2B4) dan prebiotik (fruktooligosakarida) terhadap profil histologi dan kandungan Imunoglobulin A (IgA) usus halus. Penelitian ini diawali dengan uji antibakteri penyebab diare pada empat formula yogurt, yaitu yogurt F1 (L.bulgaricus + S. thermophillus + FOS 5%), F2 (L. bulgaricus + S. thermophillus + L. plantarum 2C12 + FOS 5%), F3 (L. bulgaricus + S. thermophillus + L. fermentum 2B4 + FOS 5%), dan F4 (L. bulgaricus + S. thermophillus + L. plantarum 2C12 + L. fermentum 2B4 + FOS 5%). Pengujian antibakteri ini menggunakan metode kontak, dimana formula yogurt dikontakkan dengan Enteropatogenik E.coli K1.1 (EPEC K1.1) selama 2, 4 dan 6 jam. Analisis statistik menunjukkan bahwa masing-masing formula yogurt tidak memberikan pengaruh nyata terhadap rata-rata log kematian EPEC K1.1 pada setiap waktu kontak (P>0.05). Derajat keasaman (pH) pada seluruh formula yogurt menunjukkan nilai pH yang tidak berbeda nyata (P>0.05). Dari segi organoleptik, yogurt F3 memiliki tekstur paling baik dilihat dari whey yang paling sedikit
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Judul: Penentuan Harga Opsi Put Amerika dengan Simulasi Monte Carlo
Abstrak: An American option is an option that can be exercised at the strike price anytime before or on the date of expiration. In this thesis, Monte Carlo simulation for valuation of American option is presented. Monte Carlo simulation is one of the numerical methods used to determine the price of American options. The simulation provides several examples of initial stock price , rate of interest , exercise time , volatility , and strike price K. The simulation study shows the cost of the option c decreases when S increases, c decreases when r increases, c increases when T increases, c increases when  increases, and c increases when K increases.
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