Judul: Aktivitas antikanker ekstrak etanol daun surian (Toona sinensis) pada tikus betina galur sprague-dawley yang diinduksi 7,12-Dimetilbenz(α)Antrasena
Abstrak: Surian leaves (Toona sinensis) contain bioactive compounds, which have been reported as an anticancer agent. However, in vivo study of surian leaves as anticancer has not been carried out. This research was conducted to investigate anticancer activity of surian leaves ethanol extract in rats that had been induced with 7,12-dimetilbenz(α)antrasena (DMBA). Twenty female rats were divided into 5 groups (n=4), namely normal, cancer, doxorubicin, extract I and II groups. Cancer induction was carried out once by injecting DMBA via intravena with a dose of 25 mg/Kg BW. The extract I and II groups were administered orally by surian leaves ethanol extract at 500 mg/Kg BW and 750 mg/Kg BW for 30 days, meanwhile doxorubicin group was administered by doxorubicin once a week for 3 weeks at 2 μg/200 g BW via intravena. Anticancer activity was determined by observing the decrease of tumor volume that was calculated based on number of nodules and cancer diameter. Cancer volume of doxorubicin group decreased by 6.438 cm3. In the mean time, cancer, extract I, and extract II groups consecutively increased by 25.832 cm3, 25.836 cm3 and 23.279 cm3 respectively. This results showed that the extract was not effective in repressing cancer growth.
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Judul: Aktivitas Ekstrak Kulit dan Daun Surian (Toona sinensis) sebagai Antihiperglikemia Pada Tikus Diabetes (Sprague-Dawley) Yang Diinduksi Streptozotocin
Abstrak: Ekstrak etanol 70% pada kulit dan daun surian berpotensi sebagai antihiperglikemia. Namun penelitian secara in vivo belum dilakukan. Penelitian ini bertujuan untuk menguji aktivitas antihiperglikemia ekstrak etanol 70% kulit dan daun surian pada tikus diabetes yang diinduksi streptozotocin berdasarkan bobot badan, dan kadar glukosa darah puasa. Tikus terdiri dari 28 ekor yang dikelompokkan menjadi 7 kelompok yaitu kelompok normal, kontrol negatif, kelompok kontrol positif yang diberikan glibenklamida dengan dosis 3,22 mg/kg bb, kelompok ekstrak kulit dengan dosis 150 mg/kg bb, kelompok ekstrak kulit 300 mg/kg bb, kelompok ekstrak daun dengan dosis 150 mg/kg bb dan kelompok ekstrak daun dengan dosis 300 mg/kg bb. Kelompok ekstrak kulit 150 mg/kg bb memiliki aktivitas anyihiperglikemia yang lebih baik dibandingkan kelompok lainya yang ditunjukan oleh persentase penurunan kadar glukosa darah sebesar 72,83% dan kelompok ini memiliki kemampuan mempertahankan bobot badan leih baik dibandingkan kelompok ekstrak lainnya serta konsumsi pakan yang stabil selama proses penelitian.
Keyword: Antihiperglikemia, diabetes mellitus, glukosa darah, surian

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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