Judul: Analisis Residu Antibiotik pada Daging dan Hati Itik di Kabupaten Bogor
Abstrak: Itik merupakan salah satu sumber protein hewani yang banyak dikonsumsi di Indonesia. Kualitas dan keamanan daging itik yang dikonsumsi perlu diperhatikan dari bahaya adanya residu antibiotik yang terkandung di dalam daging. Penelitian ini bertujuan untuk mendeteksi residu antibiotik yang terkandung pada daging dan hati itik. Sebanyak 52 sampel daging dada, daging paha dan hati itik yang diperoleh dari 7 kelompok ternak itik di 5 kecamatan di wilayah Kabupaten Bogor yaitu Kecamatan Ciomas, Gunung Sindur, Klapanunggal, Jasinga dan Jonggol. Sampel yang diambil dari setiap kecamatan berdasarkan proporsi jumlah kelompok ternak itik di setiap kecamatan di Kabupaten Bogor. Hasil pengujian residu antibiotik dengan metode bioassay pada masing-masing sampel daging dan hati itik yang diambil dari peternakan itik di Kabupa-ten Bogor menunjukkan adanya residu antibiotik pada daging dada (7.69%), daging paha (9.61%) dan hati (32.69%). Residu antibiotik golongan makrolida dideteksi pada sampel daging dada, paha, dan hati. Pada sampel daging dada dideteksi residu antibiotik golongan tetrasiklin, sedangkan golongan aminoglikosida dideteksi pada sampel hati. Sampel yang menunjukkan hasil positif pada metode bioassay dikonfirmasi dengan metode high performance liquid chromatography (HPLC). Pada sampel daging dada dan paha yang positif antibiotika dideteksi adanya residu antibiotik jenis tilosin dari golongan makrolida dengan kadar 0.07–0.360 mg/kg. Antibiotika jenis tetrasiklin dari golongan tetrasiklin dideteksi pada sampel daging paha dengan kadar 0.201–0.321 mg/kg.
Keyword: antibiotic residue, bioassay, duck liver, duck meat, HPLC.

Judul: Deteksi Residu Antibiotik pada Hati Itik Berasal dari Peternakan di Kabupaten Bogor
Abstrak: The research was aimed to detect the existence of antibiotic residue in ducks liver at poultry in Bogor District. There were 53 samples which were taken from 5 Sub-districts in Bogor District. The research was done by bioassay method. The result showed that antibiotic residue in ducks liver was detected positive (32.1%) from aminoglicoside and macrolide group. Antibiotic residue came from poultry in Ciomas Sub-district (29.4%), Gunung Sindur (11.8%), Jasinga (35.3%), and Jonggol (23.5%). Based on aminoglicoside group, it was 3.77% came from Jonggol Sub-district (12.5%), while tetrasiclin and penicilin was not found. In Klapanunggal Sub-district was detected negative antibiotic residue in the result of testing. Therefore, it is needed to control toward the excistence of antibiotics residue in order to guarantee the consumens health
Keyword: duck., bioassay method, antibiotic residue

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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