Judul: Efek Berbagai Jenis Pakan Kedelai (Glycine max L. Merrill) terhadap Produksi Hormon Estrogen pada Tikus Sprague Dawley Betina
Abstrak: Soybean (Glycine max L. Merrill) is a plant that contains high nutritional components. Researchs suggested that soybean contains high phytoestrogens, called isoflavones. This study aimed to measure the effect of soy feed contained isoflavones with three different concentration through the estrogen hormone level of Sprague Dawley female rats. There are 7 groups treatment (each group of 4 rats) which consists of a negative control group with feed casein (KN), 3 groups of feed with soybean powder 100% concentration (K1), 50% (K2), and 10% (K3) and 3 three other groups were given feed with soy protein isolate 100% concentration (IPK1), 50% (IPK2), and 10% (IPK3). The concentration of the hormone estrogen in the blood serum was measured by ELISA method (Enzyme-Linked Immunosorbent Assay). Results showed the source of isoflavones and the different protein levels were significantly different (p <0.05) the levels of the hormone estrogen of female mice with soybean powder treatment and not significantly different (p> 0.05) for soy protein isolate treatment. The concentration of the hormone estrogen increased as fed treatment soy 10% (K3), isolate 10% (IPK3), 50% (IPK2), and 100% (IPK1). Its concentration is 1455 ± 942.15 pg/mL, 939 ± 430.30 pg/mL, 869.44 ± 685.38 pg/mL, and 850 ± 46.39 pg/mL
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Judul: Perubahan Kadar Hormon Estrogen Pada Tikus Yang Diberi Tepung Kedelai Dan Tepung Tempe
Abstrak: Soybean and tempeh contains isoflavon compound. The isoflavon molecule structure is similar with endogen estrogen. Hence, isoflavon is able to bond with estrogen reseptor so it can replace estrogen function. Estrogen hormone level have a large variation depend on estrus cycle phase. The objective of the research was to prove exogenous estrogen that produced by soybean flour and tempeh flour increases estrogen hormone level of ovariectomy rat, and to compare the ovariectomy rat estrogen hormone level that given soybean flour and tempeh flour. The experimental method used in this research is Randomized complete design with 6 block of treatments and 5 times repetition. The block of treatments are non-ovariectomy rat fed by pelet/control (Non-ov K), non-ovariectomy rat fed by 10 g dry weight/100 g body weight/day soybean flour (Non-ov Kd), nonovariectomy rat fed by 10 g dry weight/100 g body weight/day tempeh flour (Non-ov T), ovariectomy rat fed by pelet/control (Ov K), ovariectomy rat fed by 10 g dry weight/100 g body weight/day soybean flour (Ov Kd), ovariectomy rat fed by 10 g dry weight/100 g body weight/day tempeh flour (Ov T). The data of estrogen level is analyzed by Analysis of Variance (ANOVA) and then continued by Duncan Multiple Range Test at 95% confidence interval (5% significance level). Non-ovariectomy rat that given tempeh flour have longer estrus cycle than the non ovariectomy rat that given soybean flour. The isoflavon contained on the tempeh flour and soybean flour have an effect on vagina epitel, that is the proliferation and cornification on vagina epitel cell. Estrogen hormone level on non-ovariectomy rat fed by tempeh flour is higher than the estrogen hormone level on non- ovariectomy rat fed by soybean flour. The length of the estrus phase between the ovariectomy rat fed by tempeh flour, and ovariectomy rat fed by soybean flour equal to non ovariectomy rat fed by pelet. The added of soybean flour and tempeh flour to ovariectomy rat optimize estrogen hormone in order to happening the estrus phase. The added of tempeh flour to non ovariectomy and ovariectomy rat is better than the soybean flour.
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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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