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 Kabupaten Cianjur
Abstrak: Ectoparasite mites are parasitic organisms that live on the surface of the host, sucking the blood or feed on hair, fur, skin, or skin secretions. This research aim to inventarisation and identification of mites ectoparasites on gecko in Cianjur areas. The research was conducted from January 2012 until July 2012. Gecko and mites were collected and preserved in 70% alcohol. Whole mount of the mites was prepared used polyvinyl alcohol media. The result showed that there are three species of gecko (Cosymbotus platyurus, Hemidactylus frenatus, and Gehyra mutilata) was infested by Geckobia mites. There are new seven spesies of Geckobia (G4, G5, G6, G7, G10, G11, and G12). Analysis of the presence of mites done by calculate the value of prevalence (P), the average intensity of infestation (I), and the total intensity (It). The prevalence in C. Platyurus gecko (P = 74.38%) is higher than G. mutilata (P = 50%), and H. frenatus (P = 33.33%), while the average infestation intensity (I) and total intensity (It) is the highest found in G. mutilata (I = 10 and It = 11). Geckobia G4 and Geckobia G10 were found only on C. platyurus; Geckobia G5 and Geckobia G12 were found on C. platyurus and G. mutilata; Geckobia G6 were found on whole infected gecko; Geckobia G7 were found on C. platyurus and H. frenatus; and Geckobia G11 were found on H. frenatus and G. mutilata. So it is concluded that the new seven species mites has not a specific distribution pattern of their hosts.
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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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