Judul: Cacing endoparasit pada kadal kebun (Eutropis multifasciata) di sekitar kampus IPB Dramaga dan Gunung Salak Endah Bogor
Abstrak: Worm symbionts, inhabitant in gastrointestinal tract of animal need studied for building a database of symbion fauna. The objective of this research was identifying the worms in the gastrointestinal tract of lizard Eutropis multifasciata, which lives around IPB Campus Dramaga and Salak Endah Mount. Worm dehydrated and stained by eosin for microscopic observation. Lizard more found in the Salak Endah Mount (66.67%) than in the IPB Campus Dramaga (30%). The endoparasite worm were mostly found in large intestine (46.8%), in cloaca (31.6%), small intestinal (16.5%), and stomach (5%) respectively. The worms belong to four families, that are Davaineidae (46.8%), Tetrarhynchobothriidae (36.0%), Trichostrongyloidae (15.8%), and Rhabditidae (1.4%).
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Judul: Cacing endoparasit pada kadal kebun (Eutropis multifasciata) di sekitar Kampus IPB Dramaga dan Gunung Salak Endah Bogor
Abstrak: Cacing simbion yang hidup di dalam saluran pencernaan hewan perlu dipelajari untuk membangun database fauna simbion. Penelitian ini bertujuan untuk mengidentifikasi cacing endoparasit pada saluran pencernaan kadal kebun Eutropis multifasciata (Scincidae, Squamata), yang hidup di sekitar kampus IPB Dramaga dan Gunung Salak Endah Bogor. Untuk pengamatan mikroskopis, cacing didehidrasai dan diwarnai eosin. Kadal yang terinfestasi cacing lebih banyak ditemukan di daerah Gunung Salak (66.67%) dibanding di Kampus IPB (30%). Di dalam tubuh kadal, cacing endoparasit terbanyak ditemukan di usus belakang (46.8%), kemudian berturut-turut di bagian kloaka (31.6%), usus depan (16.5%), dan lambung (5%). Cacing yang ditemukan dapat dikelompokkan menjadi Davaineidae (46.8%), Tetrarhynchobothriidae (36.0%), Trichostrongyloidae (15.8%), dan Rhabditidae (1.4%).
Keyword: Endoparasite worm, Lizard, Nematode, Plathyhelminthes, Bogor Agricultural University

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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