Judul: Kerentanan kutu ayam Menopon gallinae (Linn) (Mallophaga: Menoponidae) di Bogor dan sekitarnya terhadap beberapa jenis pestisida fosfor-organik dan karbamat bentuk serbuk
Abstrak: Tujuan penelitian ini adalah untuk mengetahui status kerentanan beberapa populasi kutu M. gallinae terhadap coumaphos, carbaryl, trichlorfon, diazinon dan malathion, khususnya untuk mengetahui konsentrasi letal 50 % (KL50), di daerah Bogor dan sekitarnya. Kutu dewasa diambil secara manual dari tubuh ayam-ayam di peternakan-peternakan ayam Sindangbarang, Maseng, Cimanglid, Waru dan Ciapus. Disediakan dua ekor ayam petelur ras coklat untuk memelihara setiap isolat kutu. Ayam-ayam dipelihara terpisah satu dari yang lain agar masing-masing isolat tidak tercampur. Pengujian dilakukan terhadap kutu dewasa yang dikumpulkan dalam gelas-gelas/cawan, menggunakan pestisda i (R) coumaphos (Asuntol 50 WP, carbaryl (Sevin (R) 85 S), diazinon (Neocidol(R) 40 WP), trichlorfon (Neguvon (R)) dan malathion (Malathion (R) 40 WP). Pengujian dilakukan dengan cara menempatkan kutu dewasa ke dalam gelas berisi konsentrasi tertentu masing-masing pestisida, kemudian selama tiga menit gelas digoyang-goyangkan supaya setiap kutu terkena serbuk insektisida dengan cukup. Setelah tiga menit isi gelas dituangkan ke baki dan kutu dibersihkan dari pestisida. Pengamatan dilakukan untuk menghitung respon kutu terhadap pestisida. ...
Keyword: Pesticide resistance, Menopon gallinae

Judul: Efektivitas Sipermetrin terhadap Kutu Menopon galiinae dengan Metode Penyemprotan pada Ayam Petelur
Abstrak: The presence of ectoparasites is one of the obstacles faced by the layer poultry farm. Losses caused by ectoparasites infestation were large enough, such as the decreasing of egg production. Control measures were mostly done by using insecticides. This study aimed to determine the effectiveness of cypermethrin in controlling Menopon gallinae lice infestations by spraying method in laying hens. A total of 51 lice infested laying hens obtained from commercial farms in Ciseeng, Bogor were grouped into fives. Four groups were treated by the cypermethrin, and the rest of the group as a control treated by water. Each group consisted of three chickens, and treated by cypermethrin spraying with four replications. The concentration of cypermethrin for each groups were 0.5 g/L, 0.375 g/L, 0.25 g/L, and 0.125 g/L. Lice were identified and calculated by using the counter. Lice observations were done three times i.e before treatment, 24, and 5 48 hours after cypermethrin treatments. The result showed that the lice found only one species M. gallinae with the largest distribution in the breast region (89.93%). The effect of cypermethrin treatment in different concentration levels showed that the reduction of lice infestations were not significantly differents (p>0.05). The concentration of cypermethrin 0.125-0.5 g/L was effectively to control lice in laying hens by spraying method (reduction values 66.35-100% at 24 hours after treatment).
Keyword: cypermethrin, ectoparasites, insecticide, laying hens, lice, M. gallinae

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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