Judul: Deteksi Residu Tetrasiklin pada Keju yang Diimpor melalui Pelabuhan Tanjung Priok, Jakarta
Abstrak: Tetrasiklin banyak digunakan di peternakan baik untuk pencegahan dan pengobatan penyakit maupun sebagai pemacu pertumbuhan. Administrasi yang tidak benar dapat mengakibatkan residu antibiotik pada susu dan produknya termasuk keju serta dapat berkontribusi terhadap perkembangan resistensi mikroba terhadap obat, penyebaran bakteri resisten, serta berdampak serius terhadap kesehatan konsumen. Penelitian ini bertujuan mendeteksi keberadaan residu tetrasiklin pada keju yang diimpor melalui Pelabuhan Tanjung Priok, Jakarta selama bulan Januari sampai Maret 2015. Kajian yang digunakan pada penelitian ini adalah kajian lintas seksional. Besaran sampel sebanyak 51 dihitung dengan menggunakan formula n = [1-(1-a)1/D] [N-(D-1)/2] dengan keterangan N = jumlah populasi, n = ukuran sampel, a = tingkat kepercayaan (95%) dan D = nilai dugaan populasi positif (13.33%). Deteksi residu tetrasiklin pada keju impor dilaksanakan dengan menggunakan dua metode uji yakni competitive enzyme-linked immunosorbent assay (ELISA) dan bioassay. Kedua pengujian tersebut dilakukan secara pararel. Data dari penelitian ini dianalisa secara deskriptif. Hasil analisis dengan metode ELISA kompetitif menunjukkan tujuh dari 51 (13.7%) sampel yang diuji mengandung residu tetrasiklin dengan konsentrasi 2.47-11.99 ppb. Hasil analisis dengan metode bioassay menunjukkan 11 dari 51 (21.6%) sampel yang diuji mengandung residu tetrasiklin. Kisaran konsentrasi yang didapat dari hasil pengujian ELISA menunjukkan bahwa konsentrasi residu dalam sampel keju impor berada jauh di bawah BMR yang ditetapkan oleh Standar Nasional Indonesia 01-6366-2000 (50 ppb) dan Codex Alimentarius Commission (100 ppb). Hasil penelitian menunjukkan bahwa surveilans terhadap berbagai residu antibiotik pada keju impor perlu dilakukan secara rutin demi menjamin perlindungan kesehatan konsumen.
Keyword: bioassay, ELISA, keju impor, residu antibiotik, tetrasiklin

Judul: Analisis Residu Antibiotika Tetrasiklin dalam Susu Bubuk yang Diimpor melalui Pelabuhan Laut Tanjung Priok
Abstrak: Using antibiotics in dairy farm are popular for therapy or applied as a stimulant growth. However, the presence of antibiotic residue in milk causes harmful effects on consumer's health. Tetracycline is one of the antibiotic used in an effort to improve the health of livestock, especially in disease treatment. The aim of this research was to analyze tetracycline residue in imported milk powder. Sixty imported milk powder samples were collected at Tanjung Priok Sea Port. All samples were tested using enzym linked immunosorbent assay (ELISA) as a screening test and the result showed 8 out of 60 samples (13.33%) were positive of tetracycline residue. Eight samples which were positive determined by ELISA then were confirmed by high performance liquid chromatography (HPLC) method. Five of the 8 samples contained tetracycline residue in the confirmation method. Five samples contained tetracycline residue in a high concentration, which was above the maximum residue limit according to the National Standardization Agency of Indonesia.
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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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