Judul: Inventarisasi dan Identifikasi Tungau Ektoparasit pada Cicak di Kabupaten Sumedang
Abstrak: Ectoparasite is parasite living outside of its host. One of parasites infects on Reptile body is mite. Pterygosomatidae lizard is infected by Geckobia mites. The aim of this research was to classify, identify, and examine the about infection of ectoparasitic mite on lizard in Sumedang. Lizards were collected and preserved in Alcohol 70%. Mites were taken from head, eyes, armpit, body, thigh, tail, fingers, and toes. Mites were prepared on whole mount method using polyvinyl alcohol (PVA) media and was dried in oven for 2 weeks at temperature 400C. Ectoparasitic mites infecting the lizards were Geckobia sp1, Geckobia glebosum, Geckobia sp4, Geckobia sp5, Geckobia sp6, Geckobia sp10, Geckobia sp13 and Geckobia sp17. Total prevalence of infected lizards valued was 97%. The highest average of mite infection intensity on lizard C. platyurus was mite G6, H. frenatus was mite G. glebosum, H. garnotii was mite G1, and G. mutilata was mite G10. The highest infection intensity of mite was on H. garnotii
Keyword: ectoparasites, mites, Geckobia, intensity, infestation

Judul: Inventarisasi dan Identifikasi Tungau Ektoparasit pada Cicak di Pasar dan Suaka Margasatwa Muara Angke, Jakarta
Abstrak: Ectoparasites are form of parasite that stick on the surface of organism, suck their blood or looking for feed on hair, fur, skin, or skin secretions. This study was aimed to inventory, identify, and analize mites infestation in the lizard ectoparasites on market and Muara Angke conservation area, Jakarta. Lizards were collected and preserved in 70% alcohol. The sticky sites on lizard which could be infested are head, ears, armpits, torso, thighs, forelimbs, hind limbs, and tail. All mites were prepared with PVA media. The results showed that there were four species of Geckos, Cosymbotus platyurus, Hemidactylus garnotii, Hemidactylus frenatus, and Gehira mutilata. Identification results based on characters of mites found six types of Geckobia (G1, G2, G5, G6, G10, G11). However based on chaetotaxy the G5 and G11 were grouped as G. indica, G2 in G. glebosum, G6 were in Geckobia group 1, G10 in group with G. gleadoviana, and unidentified G1 geckos. Hemydactylus garnotii was found to had the largest prevalence values at market and conservation, i.e 94.4% and 73.3%. Hemydactylus garnotii also was found to had the largest infestation intensity values at market and conservation, i.e 28.1 and 7.7
Keyword: lizard, Geckobia, chaetotaxy, ectoparasite mites

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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