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: Analisis Residu Hormon Melengestrol Asetat dalam Daging Sapi yang Diimpor dari Australia dan Selandia Baru melalui Pelabuhan Laut Tanjung Priok
Abstrak: Melengestrol acetate (MGA) is an orally active progestational steroid used to improve weight gain, feed conversion efficiency, promote growth, and suppress oestrus in beef heifers. The use of MGA can leave residue in meat and may caused carcinogenic effects. The objectives of this research were to detect MGA residue in imported meat, and to analyze the presence of the MGA residue in imported meat from Australia and New Zealand. Sample size was calculated using the formula according to Canon and Roe (1982) cited by Martin et al. (1987) and selected by random sampling. All samples were analyzed using enzym linked immunosorbent assay (ELISA). The test showed that 6 out of 59 samples (10.17%) contained MGA residues in imported meat from Australia, while 2 out of 59 samples (3.39%) contained MGA residues in imported meat from New Zealand. The result showed that MGA mean concentrations in imported meat from Australia and from New Zealand were 0.256 ± 0.018 ppb and 0.315 ± 0.006 ppb. Concentration of MGA in imported meat from Australia and New Zealand did not differ (p>0,05). MGA concentrations in imported meat from Australia and New Zealand were lower than the maximum residue level (MRL) according to the Indonesian National Standard.
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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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