Judul: Gambaran darah, bursa fabricius, timus dan populasi mikroba sekum ayam broiler yang diberi prebiotik (Xilooligosakarida) dari tongkol jagung
Abstrak: Penelitian ini dilakukan karena dilatarbelakangi oleh adanya kesadaran masyarakat akan produk peternakan yang aman dan sehat yaitu produk peternakan yang bebas dari residu obat-obatan dan bebas patogen. Penggunaan antibiotik secara rutin akan menimbulkan resistensi bakteri dan menimbulkan masalah terhadap kesehatan manusia, karena bakteri akan membawa faktor resistensi yang akan menginfeksi manusia ketika manusia mengkonsumsi produk hasil ternak (Chekee, 2004). Kondisi tersebut perlu diperbaiki dengan mengurangi penggunaan antibiotik pada unggas yang stres atau terserang penyakit dengan menggunakan prebiotik yang salah satunya berasal dari limbah pertanian yaitu tongkol jagung. Penelitian ini bertujuan untuk membandingkan efektivitas pemberian antibiotik bambermycin dan prebiotik berasal dari tongkol jagung terhadap gambaran darah, persentase bobot bursa fabricius, persentase bobot timus, jumlah mikroba, dan VFA sekum ayam broiler yang diinfeksi dengan E.coli. Penelitian ini menggunakan 180 ekor ayam broiler strain cobb umur satu hari (Day Old Chick) dipelihara selama 5 minggu. Penelitian ini menggunakan menggunakan Rancangan Acak Lengkap (RAL) faktorial dengan pola 2 x 3 dengan 3 ulangan, dimana faktor A yaitu perlakuan diinfeksi E.coli dan tanpa diinfeksi E.coli , sedangkan faktor B yaitu perlakuan kontrol (tanpa antibiotik dan prebiotik), perlakuan dengan penambahan prebiotik 2,5%, dan perlakuan dengan penambahan antibiotik 0,01%. Peubah yang diamati adalah eritrosit, hematokrit, hemoglobin, leukosit, diferensiasi leukosit, bursa fabricius, timus dan populasi mikroba sekum ayam broiler. Data yang diperoleh dianalisis dengan analysis of variance (ANOVA) dan jika perlakuan berbeda nyata terhadap peubah yang diukur dilanjutkan dengan uji lanjut kontras ortogonal.
Keyword: pathogenic bacteria, non-pathogenic bacteria, E.coli bacteria, Factorial Completly Randomized Design, ANOVA, bursa fabricius

Judul: Pengaruh Pemberian Prebiotik Dari Tongkol Jagung Terhadap Retensi Nitrogen Dan Energi Metabolis Ransum Ayam Broiler Pasca Infeksi Bakteri Escherichia Coli.
Abstrak: An experiment has been conducted to study the effect of feeding corncob prebiotic on nitrogen retention and metabolizable energy of broiler diet post-infected with Escherichia coli bacteria. Thirty broiler chickens at five week of age were used in this experiment and divided into six treatment groups and each consisted of five replications. The treatments were K1 (basal diet, non infected E. coli), K2 (basal diet, infected E. coli), P1 (basal diet + prebiotic 2.5%, non infected E. coli), P2 (basal diet + prebiotic 2.5%, infected E. coli), B1 (basal diet + antibiotic 0.05%, non infected E. coli), B2 (basal diet + antibiotic 0.05%, infected E. coli). The diets contained 3150 kcal/kg ME and 18% crude protein according to Leeson and Summers (2005). Antibiotic used in this experiment was Bambermycin. A Completely Randomized Factorial Design was used in this experiment and Duncan’s multiple range test used as further test. Adding prebiotics in the diet of broilers infected with E. coli significantly (P<0.05) increased metabolizable energy. Adding prebiotics in the diet of broilers significantly (P<0.01) decreased nitrogen consumption and nitrogen retention. The conclusion of this study is that prebiotics supplementation in the diet of broiler improved on metabolizable energy.
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: