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: Pemanenan Energi Listrik dari Kincir Angin Vertikal
Abstrak: Usaha pemanenan energi angin di Indonesia masih sedikit. Sampai Tahun 2016 hanya 3.54 MW alat pemanenan energi angin yang sudah terpasang. Kendala utamanya ialah dibutuhkan investasi yang besar untuk membuatnya. Pembuatan kincir angin dengan ukuran yang lebih kecil dengan bahan yang dapat dibeli di pasar lokal menjadi solusi agar pembuatan kincir angin lebih ekonomis. Pembuatan kincir vertikal tipe Savonius dapat menjadi solusinya. Kincir vertikal Savonius dapat beroperasi pada kecepatan < 3 m/s dan ketinggian < 50 m. Kincir angin ini terdiri dari tiga sistem, yaitu generator, rotor kincir dan transmisi pulley-belt. Generator dibuat dari modifikasi motor AC dan magnet neodymium. Rotor kincir dibuat dari pipa PVC 4”, pipa alumunium ¾”, dan papan polikarbonat. Transmisi pulley-belt dibuat dari plastik dan karet. Kincir ini membutuhkan gaya minimal 3 N untuk dapat berputar atau torsi minimalnya 0.75 Nm. Kecepatan angin yang dibutuhkan untuk merotasikannya sebesar 1.9 m/s. Daya maksimal yang dapat dihasilkan ialah 5.76 watt berupa tegangan sebesar 36 volt dan arus 160 mA.
Keyword: energi terbarukan, generator, motor AC, sudu Savonius