Judul: Kajian semi-kuantitatif residu zeranol pada daging sapi beku impor dengan metode ELISA
Abstrak: Residu hormon pertumbuhan pada daging dapat berbahaya bagi organ reproduksi manusia. Zeranol merupakan salah satu hormon pertumbuhan yang dapat ditemukan terakumulasi pada daging. Tujuan penelitian ini adalah menganalisis kadar residu zeranol secara semi-kuantitatif pada daging sapi beku impor tahun 2012 dengan uji Enzyme linked immunosorbent assay (ELISA). Sampel daging sapi beku impor sebanyak 64 sampel berasal dari Balai Besar Karantina Pertanian Tanjung Priok Jakarta. Hasil uji dari 64 sampel daging terhadap residu zeranol dengan ELISA diperoleh sebanyak 68.75% atau 44 sampel dari 64 sampel terdeteksi mengandung zeranol. Rentang nilai kandungan zeranol dengan uji ELISA yang terdeteksi pada sampel daging sebesar 0.204- 2.038 ppb, dengan nilai rata-rata residu zeranol sebesar 0.167 ± 0.102 ppb. Namun terdapat satu sampel dari 43 sampel yang terdeteksi memiliki residu zeranol di atas Maximum Residue Limit (MRL) yang telah ditetapkan oleh Codex Alimentarius Commission (CAC) dan Badan Standardisasi Nasional (BSN).
Keyword: frozen meat, ELISA, zeranol

Judul: Kajian Kualitatif Residu Melengesterol Asetat (MGA) pada Daging Sapi Beku Impor dengan Metode ELISA
Abstrak: Melengesterol Acetate (MGA) is a synthetic anabolic steroid hormone used as growth promoter and suppress estrus in some feedlot exporter. Most of the synthetic anabolic steroids have a poor metabolism so it can be stored in an unchanging state in the liver, kidney, muscle, and fat of animals. MGA residues in beef can lead the risk of health problems in humans if it is high accumulates in the body such as toxicity, hypersensitivity, carcinogenic to teratogenic disorders, therefore the presence of MGA residues in beef have become the government and the world concern in the safety of foods from animal origin. Enzyme Linked Immunosorbant Assay (ELISA) is a serological method that can detect the presence and concentration of MGA residues in beef. Results obtained by using the ELISA method in this study shows that 83,72 % samples have concentration of MGA residues in imported beef is below the maximum residue limits established by Standar Nasional Indonesia (SNI 2000)
Keyword: residue., Melengesterol Acetate (MGA), ELISA, Imported Beef

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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