Judul: Jumlah Escherichia coli dalam Kulit Ayam Pedaging Asal Tempat Pemotongan dan Tempat Penjualan di Wilayah Bogor
Abstrak: Tujuan penelitian ini adalah menghitung jumlah Escherichia coli dalam kulit ayam pedaging di tempat pemotongan dan tempat penjualan di wilayah Bogor. Jumlah kulit ayam yang dijadikan sampel dalam penelitian ini sebanyak 48. Jumlah Escherichia coli dihitung menggunakan metode Most Probable Number (MPN). Data yang diperoleh dianalisis secara deskriptif. Hasil menunjukkan rata-rata jumlah Escherichia coli dalam kulit ayam pedaging di tempat potong ayam adalah 749.0±16.4 MPN/g, rumah potong ayam 928.0±198.7 MPN/g, pasar swalayan 643.0±170.3 MPN/g, pasar tradisional 940.0±204.3 MPN/g. Rata-rata jumlah Escherichia coli berdasarkan bagian kulit ayam di dada atas adalah 873.3±163.9 MPN/g, dada bawah adalah 770.0±255.2 MPN/g, punggung atas adalah 677.8±115.5 MPN/g, punggung bawah adalah 938.9±188.2 MPN/g. Jumlah Escherichia coli tertinggi berasal dari pasar tradisional dan bagian kulit area punggung bawah. Jumlah Escherichia coli di atas ambang batas cemaran maksimum yang telah ditetapkan.
Keyword: Escherichia coli, jumlah MPN, kulit ayam pedaging

Judul: Cemaran Enterobacteriaceae pada Daging Ayam dari Tempat Potong Unggas Kota Bogor
Abstrak: One of the popular meat in community of Indonesia is chicken meat. The information on microbiological status in chicken meat is required to determine the quality and safety. The objective of this research was to determine the contamination of Enterobacteriaceae in chicken meat collected from poultry slaughterplace at Sentra Pemotongan Ayam Pondok Rumput, Bogor City. A total of 30 samples of chicken carcass was analysed for total of Enterobacteiaceae using plate count method with violet red bile glucose agar (VRBGA). The average number of Enterobacteriaceae in chicken was 37 536.7 cfu/g (minimum 0 and maximum 500 000 cfu/g). This results indicated a lack of hygiene practices.
Keyword: Enterobacteriaceae, chicken meat, poultry slaughterplace Bogor

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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