Judul: Deteksi Residu Antibiotik dalam Susu Segar yang Digunakan sebagai Bahan Baku Utama Pembuatan Keju
Abstrak: Antimicrobial drugs have been used in dairy industry for more than five decades. Dairy herd health is closely associated with milk production and economic sustainability. Therefore, maintenance of herd health is closely dependent upon disease prevention and therapeutic drug use for a range of diseases. The presence of antibiotic residues in milk is a public health issue. The purpose of the present study ware to know the relationships of farmer characteristics and antibiotic residues presence in raw milk, wich used as cheese production. Farmer characteristics (age, education, breeding time, training, and number of lactating cows) were used to find the relationship between the farmer’s knowledge and the presence of antibiotic residues in raw milk. The yoghurt tests method was used to figure out the existence of antibiotic residues in raw milk as the basic material for making cheese. Eighteen raw milk samples were taken from three farmer groups that supply the milk to the cheese factory in Sukabumi. Yoghurt test showed that the milk from group A did not contain antibiotic residues, while the milk from group B and C contained antibiotic residues. Farmer characteristics indicating significant correlation with antibiotic residues presence were farmer’s education and number of lactating cows.
Keyword: 

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.
Keyword: 

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.
Keyword: