Judul: The potential analysis of seed and root of water lily (Nymphaea pubescens Willd) as a functional food prebiotic and antibacterial enteropathogenic Escherichia coli K1.1
Abstrak: The purposes of this study were (1) to determine the antibacterial activities of water lily seed and root, both against pathogenic bacteria causing diarrhea and beneficial bacteria; (2) to identify phytochemical components in water lily seed and root, and to evaluate their activities as antibacterial against pathogenic bacteria causing diarrhea; (3) to measure and evaluate water lily seed’s and root’s prebiotic activities of carbohydrate fraction in vitro; (4) to evaluate biological activity of water lily seed’s and root’s flour and extract as antidiarrheal and prebiotic sources; (5) to evaluate the potential of water lily seed and its extract as immunomodulator. Extraction of antibacterial components used multistage maceration extraction method based on solvent polarity level, i.e. hexane, ethyl acetate and ethanol. Each extract’s activities were tested using diarrhea-causing bacteria, Enteropathogenic E. coli K.1.1 (EPEC K1.1) and S. Typhimurium with agar well diffusion method. The MIC (minimum inhibitory concentration) and MBC (minimum bactericidal concentration) values were calculated with the highest antibacterial activities. Fractination was performed on extract with the largest antibacterial activity using thin-layer chromatography. The activities of each fraction were tested qualitatively by bio-autography method. Qualitative phytochemical tests were performed on all extracts.
Keyword: minimum bactericidal concentration, ethyl acetate extract, anti-diarrheal, phytocompound, minimum inhibitory concentration

Judul: Aktivitas Antibakteri Ekstrak Daun Sengon (Falcataria moluccana (L) Nielsen) terhadap Bakteri Staphylococcus aureus dan Escherichia coli
Abstrak: Disease by infection is most suffered by people and developed from time to time in medicines. The last research showed that Falcataria moluccana leafs had fitochemical compounds and potential as antibactery. The research aimed to study the antibacterial compounds activity of Falcataria moluccana leafs extract at S. aureus and E. coli with gel diffusion (well method). The leafs used in this research were leaf extract from extraction of aquades, ethanol 70%, ethanol 96%, and ethyl acetate. The concentrations were 50, 100, 150, 200, 250, and 300 mg/mL for each solvents. The result showed that aquades extract could not inhibit the growth of bacteria, while ethyl acetate and ethanol extracts showed antibacterial activity. The largest antibacterial activity showed by ethyl acetate extract at concentration 300 mg/mL with inhibiton areas 6.90 and 4.97 mm for S. aureus and E. coli. This values included in medium category. The result of Analysis of Variance with SPSS 16. program for windows showed that variance of solvents and concentration were significantly difference for inhibition areas.
Keyword: Falcataria moluccana (L) Nielsen, S. aureus, E. coli, antibactery

Judul: Pengembangan model markov tersembunyi pada identifikasi pembicara
Abstrak: Model Markov Tersembunyi merupakan suatu model yang tersusun dari dua buah proses stokastik, yaitu rantai Markov untuk menampung kemajuan temporal dan proses yang teramati untuk menampung variasi akustik. Model ini dapat digunakan sebagai metode pencocokan pola pada sistem identifikasi pembicaraan. Setiap model mewakili referensi pola dari seorang pembicara di dalam sistem identifikasi pembicara.
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