Judul: Isolasi dan Identifikasi Salmonella sp. pada Reptil.
Abstrak: Salmonella sp. is a zoonotic pathogenic agent. The incidence of salmonellosis can be spread by exotic pets. Microorganism infection in humans correlates with the popularity of exotic pets. This research aims to determine the presence of Salmonella on reptiles as a spreading factor through direct contact with humans. Cloacal skin swab of reptiles in one of petshops in Dramaga, Bogor were used as samples. This research was conducted through steps: isolation, presumptive test, and confirmation test. The result of this research showed that the prevalence of Salmonella on exotic animals especially reptiles in the mentioned pet shop is 7.5%. The positive results are mostly acquired from samples derived from snakes.
Keyword: isolation, identification, reptile, Salmonella sp., skin swab

Judul: Isolasi dan Identifikasi Salmonella enteritidis pada Telur Saluran Pencernaan dan Feses Ayam Ras dari Peternakan Ayam Petelur di Gunung Sindur Bogor
Abstrak: Salmonella became a major cause of food poisoning. Several types of Salmonella could infect chicken as well as pig, cattle, egg and other fresh product. Poultry could be infected by several types of this bacteria. Adult laying hens infected by Salmonella may carry the organisme in their small intestines and shed it in their faeces, which may lead to contamination of the eggshell surface, alternatively contamination of the laid egg may occur in vivo through the dessemination of the organisme to the egg following localization and colonization of the small intestine by Salmonella, that is by transovarian transmision. Total 6 hens, 12 eggs, and 22 samples of faeces were test. From this case, we must give more our atention to Salmonella so this study evaluated the prevalence of Salmonella in different hatchery by applying Bacteriological Analitycal Methode (BAM) for isolation and identification of this bacteria. The test shown that just faeces from Farm A which were contaminated by Salmonella. Test were not found all kind of species Salmonella in egg and gastrointestine
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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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