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: Pengaruh Media Tanam dan Zat Pengatur Tumbuh Sitokinin (BA) terhadap Perbanyakan Tunas Pisang Raja Bulu (Musa Paradisiaca L.) dari Cacahan Bonggol.
Abstrak: Banana is the important and the highest production of Indonesian fruits. The propagation of banana using corm pieces known as the cheap and effective method, that also gives diseases resistance to shoots. Furthermore, this research aimed to determine the effect of growing media types and doses of BA to increase the healthy shoots and to make the propagation of Raja bulu banana from corm pieces faster. Research used Randomize Complete Block Design (RKLT) with two factors. The first factor were cytokines (BA) with four dosages (A1:10 ppm, A2:10 ppm, A3:20 ppm, and A4:30 ppm). The second factor was growing media composition consisting of B1: soil, B2: husk charcoal, B3: husk charcoal + soil, B4: and husk charcoal + cow manure. The results showed that no interaction between media and cytocines, except from dead corm percentage at 9 weeks after planting. The media's treatment only affected the variable number of buds on the hump, number of roots, number of root corms, number of roots of the root corms, and the dead corm percentage. The most number of buds on the hump was obtained from the husk charcoal + cow manure media at 2 weeks after planting. The highest of roots on 9 weeks after planting, the highest of root corms on 7 weeks after planting, and the highest of roots of the root corms on 9 weeks after planting were obtained from the husk charcoal media. The highest dead corm percentage was obtained from the soil media at 9 weeks after planting. Cytokines BA did have no significant influence to plantain bud multiplication of Raja bulu banana from corm pieces.The pests and diseases in the soil were reduced by using of husk charcoal + cow manure media. Hence, it was suggested to use husk charcoal + cow manure media without application of cytokines to produce Raja bulu banana’s shoots.
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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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