Judul: Kajian Kualitatif Residu Trenbolon Asetat pada Daging Sapi Beku Impor dengan Metode ELISA
Abstrak: Hormone residues in meat are chemical hazard that can induce reproductive disorders if accumulated in human’s body. One of hormone residue that can be found in meat is trenbolone acetate. Trenbolone acetate is a steroid hormone synthesized from testosterone and commonly used as growth promoter in livestock animals. Inside the body, it will be metabolized in to trenbolone acetate and 17β-trenbolone that deposited in muscles. The presence of residues become a food safety’s issue that needs to be concerned. Therefore, residues check in imported meat must be done as one of customer’s protection effort. Enzyme linked immunosorbant assay (ELISA) is a method that can be used to detect hormone residue’s concentration in food product. Residue’s standard of 17β-trenbolon has range of concentration starts from 0 25, 50, 100, 200, and 400 ppt. The result of ELISA in 64 samples shows that imported frozen meat which have been tested are safe from 17β-trenbolone’s residues which was stated by Codex Alimentarius Commission
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Judul: Analisis kualitatif dan kuantitatif residu hormon trenbolon asetat pada daging sapi beku impor
Abstrak: Pemeriksaan residu hormon dilakukan sebagai bentuk penjaminan mutu dan keamanan kepada masyarakat. Penelitian ini bertujuan untuk menganalisis tingkat residu trenbolon yang digunakan sebagai growth promotor pada daging impor dengan metode high performance liquid chromatography (HPLC). Sampel daging merupakan daging sapi beku yang diimpor melalui pelabuhan laut Tanjung Priok. Pemeriksaan 30 sampel dilakukan terhadap keberadaan residu growth promotor berupa trenbolon asetat (TBA) dan 17β-trenbolon. Residu TBA pada produk hewan terutama produk pangan perlu mendapat pengawasan, pemeriksaan dan pengujian dari otoritas veteriner terutama Balai Besar Karantina Pertanian sebagai pintu gerbang masuknya bahan asal hewan dari luar. Hasil pemeriksaan sampel menunjukkan terdapat dua sampel daging yang terdeteksi mengandung residu senyawa seperti TBA dan 17β-trenbolon lebih dari dari 2 ppb. Akan tetapi konfirmasi puncak panjang gelombang menunjukan kedua sampel tidak berada dalam kisaran panjang gelombang standar. Hasil pemeriksaan sampel dinyatakan negatif terhadap keberadaan residu TBA dan 17β-trenbolon berdasarkan standar yang telah ditetapkan oleh Codex Alimentarius Commission (CAC).
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, 17B-trenbolone, HPLC, Imported meat, TBA

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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