Judul: Pengaruh Auksin (2,4-D) dan Sitokinin (BAP) dalam Kultur In Vitro Buah Makasar (Brucea javanica [L.] Merr.)
Abstrak: Buah makasar merupakan salah satu potensi tumbuhan obat yang hidup di hutan tropis Indonesia. Tumbuhan ini dimanfaatkan masyarakat untuk mengobati berbagai penyakit antara lain kanker, disentri, dan malaria. Para ahli banyak meneliti tumbuhan ini yang terkait dengan bahan bioaktif yang terkandung di dalamnya untuk meningkatkan manfaatnya mengobati berbagai penyakit. Hanya saja tumbuhan ini sudah susah dijumpai di Indonesia. Sedangkan perbanyakan secara bioteknologi belum dilakukan dimana selama ini buah makasar diperbanyak secara konvensional dengan biji. Hal ini lama kelamaan dapat mengancam kelestarian buah makasar. Oleh karena itu, berdasarkan permasalahan tersebut maka dilakukan penelitian perbanyakan buah maksar melalui kultur in vitro dengan menggunakan media tumbuh MS ditambah zat pengatur tumbuh (ZPT) auksin dan sitokinin. Tujuan penelitian ini adalah untuk mengetahui pengaruh penggunaan ZPT berupa sitokinin (BAP) dan auksin (2,4-D) dalam pertumbuhan buah makasar (Brucea javanica [L.] Merr.) secara kultur in vitro.
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Judul: Potensi Buah Makasar (Brucea javanica) sebagai Antikanker
Abstrak: Brucea javanica or makasar fruit is a plant having anticancer potency. This research aimed to obtain toxic fraction of makasar fruit against Artemia salina shrimp larvae and identify the compounds. Partition of the fruit’s crude methanol extract resulted n-hexane, dichloromethane, and n-butanol + methanol 50% extracts. Dichloromethane extract was the most toxic extract with 50% lethal concentration value of 4.2 ppm. Fractionation of the extract with column chromatography gave 21 fractions. Fraction 3 having single spot was characterized using Fourier transformed infrared spectrophotometer and gas chromatograph-mass spectrometer to identify the compounds. Three dominant compounds were obtained in fraction 3, which were alkaloid and phenolic group, namely vanillin, 1,3-diacetylindole, and 1-(1H-indol-3-yl)-3-methylbut-2-en-1-one
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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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