Judul: Peran Ekstrak Etanol Tempe Terhadap Kadar Dna Dan Rna Testis Tikus Usia 70 Hari
Abstrak: Fitoesterogen merupakan senyawa mirip estrogen yang terkandung didalam kedelai. Kedelai adalah bahan baku utama pembuatan tempe. Fitoesterogen termasuk esterogen alami golongan isoflavon. Penelitian ini dilakukan untuk mengetahui pengaruh kinerja ekstrak tempe terhadap kinerja reproduksi tikus jantan dewasa. Sebanyak 9 ekor tikus jantan usia 21 hari dibagi menjadi 3 kelompok yaitu kelompok kontrol, kelompok perlakuan 0.25 g/ekor/hari, dan kelompok perlakuan 0.5 g/ekor/hari yang diberi ekstrak tempe sampai usia 48 hari. Parameter yang diamati meliputi bobot basah testis, bobot kering testis, kadar DNA, kadar RNA, dan jumlah spermatozoa. Pengambilan data dilakukan ketika tikus berusia 70 hari. Data yang dihasilkan dianalisis dengan uji ANOVA dan dilanjutkan dengan uji Duncan dengan selang kepercayaan 95% (a=0.05). Hasil penelitian pemberian ekstrak tempe terjadi penurunan kadar DNA pada perlakuan 0.25 g/ekor/hari, peningkatan kadar RNA dan peningkatan jumlah spermatozoa pada perlakuan 0.5 g/ekor/hari.
Keyword: dna, rna, ekstrak tempe, tikus jantan

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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