Judul: Bobotkering, Kadar DNA Dan RNA Organ Ovarium, Uterus Dan Testistikus Putih (Sprague Dawley)Setelah Pemberian Genisteinumur 5-11 Hari
Abstrak: Genistein adalah salah satu senyawa fitoestrogen yang tergolong kedalam isoflavon yang dapat mengikat reseptor estrogen.Genistein dapat ditemukan dalam kedelai dan produk olahan kedelai.Penelitian ini dilakukan untuk mempelajari efektivitas genistein yang diberikan pada anak tikususia 5-11 hari terhadap bobot kering, kadar DNA dan RNA ogan ovarium, uterus dan testis. Tikus dibagi menjadi 2 kelompok dari setiap jenis kelamin yaitu kelompok kontrol yang tidak diberi perlakuan dan kelompok perlakuan yang diberi genistein sebanyak 50 mg/kg BB.Pada saat tikus berusia 4 dan 7 minggu diambil sampel organ ovarium, uterus dan testis. Parameter yang diamati meliputi bobot kering organ, kadar DNA dan RNA. Data hasil penelitian dianalisis menggunakan dengan analisa sidik ragam (ANOVA) dengan pola rancangan acak lengkap. Hasil penelitian menunjukkan bobot kering organ ovarium, uterus, dan testis pada usia 4 dan 7 minggu cenderung mengalami penurunan (P>0.05).Kadar DNA organ ovarium dan testis pada usia 4 dan 7 minggu lebih tinggi dari kontrol tetapi pada uterus menunjukkan hasil yang lebih rendah dari kontrol. Kadar RNA diusia 4 minggu pada organ ovarium dan uterus cenderung lebih tinggi daripada kontrol tetapi pada testis cenderung lebih rendah dari kontrol. Kadar RNA pada ovarium diusia 7 minggu cenderung lebih rendah dari kontrol, pada uterus lebih tinggi dan pada testis tidak ada perubahan.
Keyword: Fitoestrogen, Genistein, Kadar DNA dan RNA, Reproduksi

Judul: Peran Ekstrak Etanol Tempe Terhadap Kadar DNA dan RNA Testis Tikus Jantan Usia 70 hari
Abstrak: Phytoestrogen is a subtance in soybean that have similiar structure with natural estrogen. Soybean is the main raw material of making tempe. Phytoestrogen are natural estrogen in isoflavon group. This study was conducted to investigate the role of tempe extract in reproduction performance of adult male rats. Nine male rats weaning age (21 days) were divided into 3 groups, control, treatment groups that were given a tempe extract 0.25 g/rat/day and 0.5 g/rat/day until ages of 48 days. Testicular wet weight, testicular dry weight, concentration of DNA levels, concentration of RNA levels, and sperms quantity in each group were measured. Data were collected at the age of 70 days and were analyzed using ANOVA test and Duncan test with 95% confidence interval (a=0.05).The results show that tempe extract of 0.25 g/rat/day could decrease the concentration of DNA levels and 0.5 g/rat/day increase the RNA levels and the sperm quantity.
Keyword: Bogor Agricultural University, tempe extract, male rats, rna, dna

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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