Judul: Scfa Profile Of Rice Rs Fermentation By Colonic Microbiota, Clostridium Butyricum Bcc B2571, Or Eubacterium Rectale Dsm 17629
Abstrak: Pati resisten tipe 3 (RS3) yang dihasilkan dari berbagai sumber makanan beramilosa tinggi melalui retrogradation atau proses enzimatik dikenal memiliki fungsi fisiologis sebagai serat makanan. Fermentasi RS3 oleh mikrobiota kolon menghasilkan SCFA (asetat, propionat, dan butirat), yang dapat menjaga kesehatan usus, keseimbangan usus mikrobiota, mencegah penyakit radang usus IBD) dan kanker kolon. RS3 dalam penelitian ini dibuat dari beras patah IR-42 dan Inpari-16 melalui perlakuan enzimatik (kombinasi amilase-pullulanase). Pati resisten difermentasi selama 12 dan 24 jam dengan mikrobiota kolon, Clostiridium butyricum BCC-B2571, atau Eubacterium rectale DSM 17629. SCFA yang dihasilkan dianalisis dengan kromatografi gas. Hasil penelitian menunjukkan bahwa setelah proses enzimatik, kadar RS3 dari IR-42 (41,13%) tidak berbeda nyata (p <0,05) dari yang Inpari-16 (37,70%). Perlakuan dengan kombinasi amilase-pullulanase sangat menguntungkan untuk meningkatkan kadar RS3. Hasil penelitian menunjukkan bahwa konsentrasi tinggi asetat (82,5 mM) diproduksi oleh mikrobiota kolon setelah 12 jam fermentasi. Kadar propionat terbaik (7,5 mM) juga diproduksi oleh mikrobiota kolon setelah 12 jam fermentasi dan konsentrasi terbaik dari butirat (6,8 mM) diproduksi oleh mikrobiota kolon setelah 24 jam fermentasi. Hal ini jelas bahwa produksi SCFA lebih baik pada mikrobiota kolon dan bukan satu strain.
Keyword: Pati resisten, mikrobiota kolon, Clostridium butyricum BCC-B2571, Eubacterium rectale DSM 17629, SCFA

Judul: Skripsi:Fermentasi Pati Resisten pada Tahu Koro OlehClostridium butyricumBCC B2571 dan Eubacterium rectaleDSM 17629
Abstrak: Resistant starch is a starch fraction which is not digested by human starch degrading enzyme and would be fermented by bacterial in the colon to produce short chain fatty acid (SCFA). Fermentation productsdependon the type of substrate and microbes available. This research was aimedto analyze the profile of SCFA produced from resistant starch in Canavalia ensiformisbean curd fermented by Clostridium butyricumBCC B2571 and Eubacterium rectaleDSM 17629. The fermentation was held in 36 hours with C. ensiformisbean curd that contain 16.04- 17.94% of resistant starch and compared to hi maize starch. The results showed similiar pattern of SCFA production from the different substrate and bacteria used. The highest production with C.butyricumoccured at 36 hours fermentation with concentration of acetate, propionate, and butyrate were 51.59, 35.57, 22.05 mM. At the same time, E.rectale was produce the highest concentration of acetate, propionate, and butyrate were 49.70, 34.77, 24.68 mM.
Keyword: Bogor Agricultural University (IPB), short chain fatty acid, resistant starch, Eubacterium rectal, Clostridium butyricum

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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