Judul: Peran ekstrak tempe terhadap kadar DNA dan RNA testis tikus usia lepas sapih
Abstrak: Tempeh is one of soy-based foods containing phytoestrogen which has similar benefit with estrogen. The phytoestrogen in soybean derived from isoflavone group. The objective of this research was to understand the effect of feeding tempeh extract on testes’ DNA and RNA level also testosterone concentration of weaning age rat until before puberty. Eighteen male rats were divided into two groups, which were control group that did not receive any treatment, and group that received 0.5 g/mL/day tempeh-extract-feeding treatment. At the age of 28, 42 and 56 days, testes and blood of male rats were collected. Parameters observed in this research were wet and dry weight testes, DNA and RNA levels, also testosterone concentration. Data obtained were analysed using Independent Samples T-test method with 95% confidence interval. Results showed that there was a significant decreasing (P<0.05) wet and dry weight testes, also total DNA and RNA level on age 28 days, but there were a significant increasing (P<0.05) on age 28 days. Testosteron concentration tended to decrease on 28 and 42 days old but it tended to increase on 56 days old.
Keyword: total of DNA and RNA, testosterone, testes, tempeh, phytoestrogen, Bogor Agricultural University (IPB)

Judul: Peran Pemberian Ekstrak Tempe terhadap Kadar DNA dan RNA Organ Reproduksi Tikus Betina pada Usia Lepas Sapih
Abstrak: Tempe is soybean product that contains phytoestrogen. This research was conducted to study the potential of tempe extract to the reproduction performance in female rats. Eighten female rats 21-days old were divided into two groups, which were control group and treatment group that were given tempe extract 0.5 g per rat everyday for 28 days. Parameters observed were estrogen hormone level, wet and dry weight, water content, total of DNA and total of RNA. Data obtained at the age of 28, 42 and 56 days. Data analyzed using Independent Samples T-test method with 95% confidence interval. Result showed that treatment group increased estrogen hormone level and increased wet weight of uterus but there was no influence on the total of DNA and RNA of organs.
Keyword: total of DNA and RNA, uterus, ovarium, phytoestrogen, tempe extract, Bogor Agricultural University (IPB)

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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