Judul: Efektivitas Ekstrak Etanol Akar Purwoceng (Pimpinella Alpina Kds) Pada Induk Tikus Selama 1-13 Hari Kebuntingan Terhadap Siklus Estrus Anak Betinanya
Abstrak: Pemberian ekstrak etanol akar purwoceng (Pimpinella alpina KDS) selama 1-13 hari kebuntingan tikus bertujuan untuk melihat kinerja reproduksi anak betinanya. Delapan ekor tikus bunting yang memiliki 5-7 anak yang digunakan pada penelitian ini dibagi menjadi dua kelompok; kelompok betina bunting sebagai kontrol dan kelompok betina bunting yang diberikan ekstrak etanol akar purwoceng dengan dosis 25 mg/300 gram BB. Setelah pemberian ekstrak etanol akar purwoceng, tikus bunting dipelihara sampai melahirkan. Anak-anak tikus betina yang dilahirkan diamati pembukaan vagina dan siklus estrusnya. Hasil penelitian menunjukkan bahwa purwoceng dapat mempercepat pembukaan vagina dibandingkan kelompok kontrol, tetapi purwoceng tidak memberikan efek pada panjang siklus estrus.
Keyword: pembukaan vagina, purwoceng, siklus estrus

Judul: Siklus Reproduksi Anak Tikus Dari Induk Yang Diberi Ekstrak Etanol Akar Purwoceng Selama 13–21 Hari Kebuntingan.
Abstrak: Purwoceng (Pimpinella alpina) is one of Indonesian medicinal herbals that was originating from high altitudes area such as Dieng at Central Java. Its root has an efficacious as aphrodisiac because of its compound such as isoflavon group. The aim of this study was to test the efficacy of phytoestrogens contained in purwoceng (Pimpinella alpina) on the descended testes, vaginal opening and estrous cycle. This study used two groups of pregnant rats. The first group consist of four pregnant rats which were given purwoceng root ethanol extract with dose of 25 mg / ml per 300 g BW orally at 13–21 gestation. The second group of rats were given water at the 13th day of gestation to 21 as a control. All pregnant rats were selected rats which has delivered 8–9 pups. The results showed that time of descended testes and vaginal opening of purwoceng group was earlier than control, descended testes of purwoceng group was on day 29 and vaginal opening was on day 36. Descended testes of control group was on day 34 and vaginal opening was on day 38. Length of estrous cycle in purwoceng group were longer than control with proestrus and estrus phase were also longer than control.
Keyword: Estrous cycle, ethanol extracted, purwoceng roots, Rattus norvegicus, vaginal opening

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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