Judul: Mikropropagasi Pisang Kepok Merah (Musa paradisiaca) : Pengaruh Media dan Zat Pengatur Tumbuh
Abstrak: Kepok merah has fairly high commercial value as an ingredient in the manufacture of banana chips industry. Kepok merah contains vitamin B complex that is important for energy production and the formation of brain cells in infants. Commercial development of kepok merah can be supported by tissue culture technique. The purpose of this study was to determine which media as well as growth regulators and concentrations is the most favorable for shoot multiplication and root formation in kepok merah. Shoot multiplication used four treatments namely: basic Murashige and Skoog medium (MS) and Woody Plant (WP), each of these media was enriched with 0.5 ppm IAA and two levels of BAP (5 and 7 ppm). Rooting stage used four of treatments : MS with NAA 1 ppm or IBA 1 ppm, and WP with NAA 1 ppm or IBA 1 ppm. Results of the experiment showed that MS medium with 0.5 ppm IAA in combination with 5 ppm BAP produce 6 – 17 buds on each explants and gave better growth for its shoots. Planlet in media MS with NAA 1 ppm produce 3 – 16 roots better than that in MS with IBA 1 ppm.
Keyword: Bogor Agricultural University (IPB), growth regulating substances., multiplication, plantain kepok merah

Judul: Multiplikasi in vitro Tanaman Pisang Kepok Merah (Musa paradisiaca cv. Kepok Merah)
Abstrak: Kepok merah is one of the cooking bananas having yellow redish mesocarp. Kepok merah has a specific benefit as baby food besides breast fed. The major problem in developing this plantain is the lack of plant seedlings. In vitro multiplication was considered as a technique to solve the problem. This research was aimed to select the best media for the multiplication of plantain kepok merah. Two steps of work have been done which were sterilization method and then treatments in the initiation and multiplication media. Sterilization 1 used consecutively substances Bayclin 20%, Bayclin 30%, Agrept, Dithane M-45, and alcohol 70% while sterilization 2 used Bayclin 5%, Bayclin 15%, and alcohol 70%. Two basic media (modified MS and WP) were used, enriched with 0.2 mg/L IAA and two levels of BAP (3 and 5 mg/L). Method 1 of sterilization was better than method 2. BAP at 5 mg/L in both basic media produced noduls on the explants, but further development was more promoted by WP.
Keyword: WP medium., plantain kepok merah, multiplication, modificated MS medium

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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