Judul: Peran Ekstrak Tempe pada Masa Prapubertas terhadap Kinerja Reproduksi Tikus Betina Rattus norvegicus
Abstrak: Tempe extract is one of soybean processed that has phytoestrogens within it. Research was conducted to analyse the potency of tempe estrogenic at prepuberty periode to reproduction system in female rats (Rattus nonvergicus) at the age of 21 days. Rats were divided into control group (without given tempe extract) and treatment group (given 6.25 g/kgBW tempe extract). Tempe extract were given during 28 days. At the age of 28, 42, and 56 days, samples of ovarium, uterus, and blood were collected from the female rats. Parameters observed were body weight, ovarium weight, uterus weight, and reproduction hormone content which were estrogen and testosteron. Data were analysed using Independent Samples T-Test methode with 95% confidence interval. Results showed that increasing of ovarium weight of treatment group is higher than control group at the age of 42 days. Phytoestrogens given is assumed to increase estrogen and testosteron at female rats at the age of 42 days.
Keyword: estrogen, ovarium, phytoestrogen, prepuberty, tempe extract, uterus

Judul: Peran ekstrak tempe pada masa prapubertas terhadap kinerja reproduksi tikus betina Rattus norvegicus
Abstrak: Ekstrak tempe merupakan salah satu bentuk olahan kedelai yang mengandung fitoestrogen. Penelitian dilakukan untuk menganalisa potensi estrogenik tempe pada masa prapubertas terhadap kinerja reproduksi yang dilakukan menggunakan tikus (Rattus nonvergicus) betina berusia 21 hari. Tikus dibagi menjadi kelompok kontrol (tanpa diberi ekstrak tempe) dan kelompok perlakuan (diberi ekstrak tempe dengan dosis 6.25 g/kgBB). Pemberian ekstrak tempe dilakukan selama 28 hari. Pada umur 28, 42, dan 56 hari dilakukan pengambilan sampel ovarium, uterus dan darah. Parameter yang diamati adalah bobot badan, bobot ovarium, bobot uterus dan kadar hormon reproduksi berupa estrogen dan testosteron. Analisis data menggunakan metode Independent Samples T-Test dengan selang kepercayaan 95%. Hasil penelitian menunjukkan peningkatan bobot badan, bobot ovarium, dan bobot uterus kelompok perlakuan lebih tinggi dibandingkan dengan kelompok kontrol pada umur 42 hari. Pemberian fitoestrogen diduga dapat memberikan pengaruh berupa peningkatan estrogen dan testosteron yang terjadi pada umur 42 hari.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Estrogen, Ovarium, Phytoestrogen, Prepuberty, Tempe extract, Uterus

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.
Keyword: