Judul: Efektivitas Antibiotik Enrofloxacin Terhadap Ayam Pedaging Yang Diinfeksi Bakteri Escherichia Coli Dan Mycoplasma Gallinarum
Abstrak: Penelitian ini bertujuan untuk mengetahui waktu pemberian antibiotik Enrofloxacin yang paling efektif untuk mengobati colibacillosis dan mycoplasmosis ditinjau dari bobot badan, morbiditas, dan mortalitas. Pelaksanaan penelitian ini adalah dari tanggal 2 sampai 24 Agustus 2014 di kandang ayam Unit Pengelola Hewan Laboratorium (UPHL), Fakultas Kedokteran Hewan, IPB. Ayam pedaging dibagi menjadi 2 kelompok besar yaitu ayam yang diinfeksi Escherichia coli (colibacillosis) dan ayam yang diinfeksi Mycoplasma gallinarum (mycoplasmosis). Setiap kelompok besar dibagi menjadi 5 kelompok kecil yaitu Kelompok A (perlakuan 6 jam pasca infeksi), Kelompok B (perlakuan 3 hari pasca infeksi), Kelompok C (perlakuan 7 hari pasca infeksi), Kontrol positif (tidak diberi perlakuan), dan Kontrol negatif (tidak diinfeksi maupun diberi perlakuan). Perlakuan adalah pemberian dosis antibiotik sebanyak 1 gram dalam 6 liter air minum. Pengamatan meliputi bobot badan, morbiditas, dan mortalitas. Data bobot badan dihitung rata-ratanya menggunakan metode analisis ragam (ANOVA) untuk menganalisa perbedaan signifikan pada bobot badan. Hasil yang diperoleh menunjukkan antibiotik Enrofloxacin efektif mengobati mycoplasmosis pada 3 hari pasca infeksi dan tidak efektif terhadap colibacillosis.
Keyword: antibiotika, efektivitas, Echerichia coli, Mycoplasma gallinarum, enrofloxacin

Judul: Efektivitas antibiotik Enrofloxacin terhadap ayam pedaging yang diinfeksi bakteri Escherichia coli dan Mycoplasma gallinarum
Abstrak: The aim of this study is to determine the most effective time to administer Enrofloxacin to broiler infected with Escherichia coli (colibacillosis) and Mycoplasma gallinarum (mycoplasmosis), in terms of body weight, morbidity, and mortality. This research was held from August 2nd until 24th 2012 in Laboratory Animal Management Unit’s (UPHL) Henhouse, Faculty of Veterinary Medicine, Bogor Agricultural University. The broilers were divided into 2 major groups, the first was infected with Escherichia coli and the second was infected with Mycoplasma gallinarum. Each group were divided into 5 small groups, namely group A (Treatment 6 hours post-infection), Group B (Treatment 3 days post-infection), Group C (Treatment 7 days post-infection), Group positive control (untreated), and Group negative control (not infected, untreated). The treatment is a dose of Enrofloxacin as much as 1 gram in 6 litre of broiler’s drinking water. The parameters observed are bodyweight, morbidity, and mortality. The bodyweight were calculated with Analysis of Variance (ANOVA) method. The results obtained showed that Enrofloxacin is effective if given 3 days post-infection and not effective against colibacillosis.
Keyword: Bogor Agricultural University, antibiotic, effectiveness, effectiveness, Escherichia coli, Mycoplasma gallinarum, enrofloxacin

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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