Judul: Antibiotic resistance in Staphylococcus aureus isolated from one broiler farm at Cibangbara Village, Sukabumi District
Abstrak: Antibiotics are widely used in poultry for therapeutic, prophylactic, and growth promotion purposes. S. aureus resistant to antibiotic, also an opportunist pathogen cause infection in human and animal. The aim of this research was to determine the antibiotic resistance of S. aureus were isolated from the cloaca swabs in from one broilers farm in Cibangbara Village, Sukabumi District. Fifteen S. aureus isolated showed present of S. aureus. The antibiotics that were used in this study were tetracycline, oxytetracycline, erythromycin, nalidixic acid, ampicillin, chloramphenicol and gentamicin. The resistance of S. aureus to various antibiotics was tested by the Kirby-Bauer method. The results were compared with Clinical and Laboratory Standards Institute (CLSI 2008). S. aureus isolates were resistant towards tetracycline (100%), oxytetracycline (100%), erythromycin (100%), nalidixic acid (60%), ampicillin (26.7%), chloramphenicol (20%), and gentamicin (6.7%). In conclusion, S. aureus showed resistant to tetracycline, oxytetracycline and erythromycin while still susceptible toward gentamicin and chloramphenicol.
Keyword: antibiotics, resistance, S. aureus

Judul: Isolasi dan Identifikasi Staphylococcus aureus Resisten Antibiotika dari Ayam Broiler di Kabupaten Cianjur
Abstrak: Staphylococcus aureus merupakan bakteri yang secara normal terdapat di kulit dan selaput lendir hewan ataupun manusia. Ayam broiler sangat rentan terinfeksi Staphylococcus aureus. Penyalahgunaan antibiotika untuk mengobati infeksi bakteri dapat menyebabkan resistensi antibiotika. Resistensi antibiotika merupakan ancaman yang nyata bagi kesehatan hewan dan manusia. Tujuan penelitian ini adalah mengidentifikasi dan mengetahui Staphylococcus aureus yang resisten terhadap beberapa antibiotika pada peternakan ayam broiler di Kabupaten Cianjur. Pengujian resistensi antibiotika menggunakan metode difusi cakram. Hasil penelitian menunjukkan bahwa isolat Staphylococcus aureus yang berasal dari peternakan ayam broiler di Kabupaten Cianjur mengalami resisten terhadap antibiotik ampisilin (83,3%), eritromisin (66,7%), dan asam nalidiksat (100,0%).
Keyword: ayam broiler, Cianjur, metode difusi cakram, resistensi antibiotika, Staphylococcus aureus

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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