Judul: Occurance of Escherichia coli O157:H7 in Chicken Meat at Traditional Markets in Pangkalpinang City
Abstrak: Penelitian ini bertujuan untuk mengetahui keberadaan E. coli O157:H7 dan menganalisis hubungan faktor-faktor dengan kejadian E. coli pada daging ayam yang dijual di Pasar Kaget, Pasar Pagi, dan Pasar Pembangunan Kota Pangkalpinang. Sampel daging ayam diambil sebanyak 30 sampel secara proporsional menggunakan simple random sampling. Metode cross sectional digunakan untuk penelitian ini. Pengujian E. coli berdasarkan SNI 2897:2008 tentang Metode Pengujian Cemaran Mikroba dalam Daging, Telur, dan Susu serta Hasil Olahannya. E. coli O157 dikonfirmasi dengan uji aglutinasi lateks O157 dan uji antiserum H7. Analisis data menggunakan uji deskriptif dan analisis faktor risiko menggunakan chi-square dan odds ratio. Hasil penelitian menunjukkan bahwa E. coli O157:H7 ditemukan pada 2 dari 30 sampel (6,7%) yang diisolasi dari Pasar Kota Pangkalpinang. Faktor risiko yang signifikan (P<0,005) terhadap keberadaan E. coli adalah pedagang yang berumur lebih dari 45 tahun, jarak kios kurang dari 5 m dari jalan raya, dan cuci tangan menggunakan air yang tidak bersih. Keberadaan E. coli O157:H7 dapat menimbulkan risiko bagi kesehatan konsumen.
Keyword: chicken meat, E. coli O157:H7, risk factors

Judul: Identifikasi cemaran escherichia coli pada daging ayam yang dijual di pasar tradisional dan pasar modern daerah Bogor Barat
Abstrak: The aim of this research was acknowledge about contaminated chicken meat from Eschericia coli which sold in traditional market and modern market. About two traditional markets and two modern markets where the samples were takenly for thirteen times, frequently once for a week. The research used Gram colouring test and biochemical test (IMViC test). Result of Gram colouring test shown that all the samples from both of traditional markets and both of modern markets was Gram negative bacterian, from IMViC test, all samples from both of traditional markets and both of modern markets were negative from Indol test and Red Metil test and positive from Voges Proskauer test and Sitrat test. Otherwise, from the result of Gram colouring test and IMViC test, bacteria which was found in thirteen samples from both of traditional and modern markets was not Eschericia coli.
Keyword: Escherichia coli, chicken meat, traditional markets, modern markets.

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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