Judul: The  performance  of  offspring  male  rats  (rattus  norvegicus) from its mother whose had been threatened by adding ethanol that  is extracted from purwoceng roots (pimpinella  alpine) on  day  1 to  day  13 of  pregnancy
Abstrak: Purwoceng (Pimpinella alpina) adalah tanaman obat langka asli Indonesia yang digunakan sebagai obat tradisional. Akarnya berkhasiat sebagai afrodisiak. Tujuan penelitian ini adalah mengkaji pemberian ekstrak etanol akar purwoceng pada induk tikus (Rattus norvegicus) dengan dosis 25 mg/300 g bobot badan selama 1-13 hari kebuntingan terhadap perkembangan tulang, bobot badan dan penurunan testis anak tikus jantan. Sebanyak 10 ekor anak tikus jantan yang berasal dari 2 kelompok induk tikus yaitu kelompok kontrol dan kelompok perlakuan (diberi purwoceng) dipelihara dan diamati perkembangannya. Hasil penelitian menunjukkan bahwa ekstrak etanol akar purwoceng dapat meningkatkan perkembangan tulang kepala pada hari ke-42, tulang punggung pada hari 1 sampai hari ke-70, tulang kaki belakang pada hari ke-56 dan hari ke-70, penambahan bobot badan pada hari ke-21 dan hari ke-49, dan penurunan testis pada hari ke-42., Purwoceng (Pimpinella alpine) is a native Indonesian medical plant species that is used to be traditional medicine. It’s root has an efficacious as aphrodisiac. This research is aimed to observe the effectivity of 25 mg/300 BW dosage of purwoceng root’s ethanol which given to pregnant rat during day 1 to day 13 on the development of skeleton, body weight, and testicle emerge of its male offspring. A total of 10 male rats have been birth from control group and treatment group (given Purwoceng) were being cared, observed, and measured for the development of skeleton, body weight, and testicle emerge. The results showed that ethanol extract purwoceng root’s could improve the development of cranial on day 42, backbone on day 1 to day 70, rear leg bones on day 56 and day 70, increased body weight on day 21 and day 49, and caused testicle emerging on day 42.
Keyword: Afrodisiak, Ekstrak Etanol, Purwoceng, Rattus norvegicus

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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