Judul: Suplementasi somatotropin untuk memperbaiki tampilan fisologis tikus jantan umur 6 dan 12 bulan
Abstrak: Penuaan sangat berhubungan dengan penurunan sekresi growth hormone (GH) dari pituitari anterior. Somatotropin atau grown hormone (GH) bekerja pada semua sel somatik atau sel tubuh. Penurunan sekresi GH mengganggu fungsi sel tubuh. Tujuan penelitian ini adalah untuk mengukur perbaikan tampilan fisiologis tikus umur 6 dan 12 bulan yang disuntik somatotropin.
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Judul: Suplementasi Somatotropin untuk Memperbaiki Tampilan Fisiologis Tikus Betina Usia Enam Bulan dan Satu Tahun.
Abstrak: As age increases, aging symptoms such as decrease of stamina, wrinkle of skin, osteoporosis, increase of body fat and menopause will appear. These symptoms are due to the decrease of somatotropin secretion which plays a significant role in cell proliferation. The objective of this study is to investigate the effects of somatotropin supplementation on physiological performaces of six-month and one-year old female rats. Forty eight female rats were assigned into a randomized block design with 4 factors. The first factor was age with 2 levels (6 months and 12 months). The second factor was somatotropin dosage with 2 levels (0 and 9 mg/kg body weight). The third factor was duration of injection with 2 levels (3 weeks and 6 weeks), and the fourth factor was sampling period with 2 levels (0 and 14 days after somatotropin termination). Parameters measured were body weight, total DNA and total RNA of ovary and uterus, plasma estrogen and progesteron levels, bone collagen and skin collagen consentrations. The results showed that somatotropin supplementation had significant effects on body weight, ovary weight, total cell of ovary, total cell of uterus, plasma estrogen and progesteron levels, bone and skin collagen concentrations. It is concluded that somatotropin improve physiological performances of aging female rats.
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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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