Judul: Deteksi Bakteri Gram Negatif pada Permukaan Daun Kemangi Ocimum basillicum dari Tiga Pasar Tradisional di Bogor.
Abstrak: Ocimum basilicum atau kemangi umumnya dikonsumsi secara mentah oleh masyarakat Indonesia, namun sayuran mentah mudah terkontaminasi bakteri patogen. Penelitian sebelumnya menemukan sayuran mentah terkontaminasi bakteri patogen Gram-negatif dan memiliki kemampuan produksi hemolisin. Penelitian ini bertujuan mendeteksi bakteri Gram-negatif pada daun kemangi (Ocimum basilicum) yang diperoleh dari tiga pasar tradisional di Bogor. Isolasi dan kuantifikasi bakteri menggunakan pengenceran berseri yang disebar pada media nutrient agar menunjukkan bahwa rata-rata jumlah bakteri pada permukaan daun kemangi adalah 9.6 x 107 CFU/g. Daun kemangi yang diperoleh dari Pasar 2 memiliki jumlah bakteri terbanyak yaitu 11.3 x 107 CFU/g. Masing-masing bakteri dengan morfologi koloni yang sama yaitu basil selanjutnya dimurnikan dan dikarakterisasi secara fisiologis. Sembilan isolat bakteri yang diperoleh mampu tumbuh pada media selektif (SSA, BSA, dan EMBA). Pewarnaan Gram menunjukkan seluruh isolat bakteri tergolong bakteri Gram-negatif. Kemampuan hemolisis isolat bakteri diuji menggunakan media blood agar base, tiga dari sembilan isolat bakteri mampu menghasilkan hemolisin. Identifikasi molekular dengan 16S rRNA menunjukkan isolat-isolat bakteri tergolong kelompok Providencia sp., Proteus sp., Pseudomonas sp., dan Kluyvera sp..
Keyword: Gram-negative bacteria, raw vegetable, tradisional market

Judul: Sifat Antibakteri Dari Ekstrak Daun Kemangi (Ocimum basilicum L.) Dan Daun Tespong (Onanthe javanica D.C.)
Abstrak: Antimicrobial test in the Ocimum basilicumL and Onanthe javanica D.C. done to find out teh potential of antibacterial at the plant as a herbs plant utilization. Herb plants used as raw material for traditional medicine and modern. Antibacterial test was carried using Kirby-Bauer method.Based on the results of the study, extracts of Ocimum basilicum L , Onanthe javanica D.C, ampicillin and chloramphenicol can’t inhibit the growth of E.coli and B.cereus. This is caused due to bacteris that are resistant to the antibiotics used in the synthesis and natural.
Keyword: antibiotic resistant, antimicrobial, Onanthe javanica D.C, Ocimum basilicumL

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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