Judul: Efikasi Antibiotik D-1 terhadap Bakteri Escherichia coli dan Mycoplasma gallinarum pada Ayam Pedaging
Abstrak: Broilers is a superior breed that as cross breed chickens with high productivity. Productivity can be decreased due to the disease such as colibacillosis and mycoplasmosis. Antibiotics could support the productivity of chickens. The aims of the research is to determine the effectiveness of antibiotic D-1 against Escherichia coli and Mycoplasma gallinarum. Research was conducted from August 2, 2012 until August 24, 2012. Observations during research has been conducted including on body weight, morbidity and mortality of each cage after infections. The results showed that antibiotic D-1is more effective against Mycoplasma gallinarum than Escherichia coli. The right time to give the antibiotic D-1 to againt Escherichia coli is between 6 hours to 3 days post-infection, while for Mycoplasma gallinarum is 6 hours post-infection.
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Judul: Efikasi antibiotik berbahan aktif enrofloxacin terhadap Escherichia coli dan Mycoplasma gallinarum pada ayam pedaging
Abstrak: Ayam pedaging merupakan ras unggulan yang memiliki produktivitas tinggi dan masa panen yang singkat. Produktivitas ayam ini dapat menurun karena adanya penyakit seperti colibacillosis dan mycoplasmosis. Pemberian antibiotic merupakan salah satu tindakan yang dapat dilakukan dalam mencegah dan mengobati penyakit ini. Penelitian ini bertujuan untuk mengetahui efikasi antibiotik yang mengandung enrofloxacin terhadap bakteri Escherichia coli dan Mycoplasma gallinarum. Penelitian ini dilaksanakan pada tanggal 1 Agustus 2012 sampai dengan 24 Agustus 2012. Pengamatan meliputi morbiditas, mortalitas, dan bobot badan ayam dari masing-masing kandang. Hasil yang diperoleh menunjukkan antibiotik ini efektif digunakan pada bakteri Escherichia coli dan Mycoplasma gallinarum. Waktu pemberian antibiotik pada ayam antara 6 jam sampai 7 hari pasca infeksi terbukti efektif dalam mencegah penyakit…
Keyword: Broiler, Efficacy, Enrofloxacin, Escherichia coli, Mycoplasma gallinarum

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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