Judul: Seleksi Primer Simple Sequence Repeat (SSR) untuk Identifikasi 17 Klon Karet (Hevea brasiliensis)
Abstrak: Rubber tree (Hevea brasiliensis) breeding have problem because it takes long time and wide area to select new superior clones. On the other hand, the effort to increase rubber trees planting is not followed by availability of original clone seeds. Quick and accurate identification is needed to solve these problems. One of strategy that can be used to solve these problems is by using Simple Sequence Repeats (SSR) molecular marker. The aim of this research was to select SSR primer that identify the 17 rubber clones specifically by its DNA pattern and polymorphism degree. Nine primers used to amplified the 17 DNA of rubber clones. SSR results was evaluated by 3% agarose and 6% polyacrilamide. Eight of nine primers in this research can identify some rubber clones. Those primers are SSRH403, SSRH548, gSSR165, gSSR212, gSSR268, EHB109, EHB169, and HBE280. The most informative primer that is SSRH403 (PIC: 0.7069) can identify five clones, while the weakest primer that is HBE280 (PIC: 0) can identify just one clone.
Keyword: Bogor Agricultural University (IPB), PIC, SSR, Hevea brasiliensis, rubber tree

Judul: Evaluasi marka simple sequence repeat (ssr) untuk membedakan 17 genotip klon karet (hevea brasiliensis).
Abstrak: Masa seleksi tanaman karet (hevea brasiliensis) secara konvensional tergolong cukup lama sekitar 25-30 tahun, sehingga dibutuhkan identifikasi secara molekuler untuk mempercepat masa seleksi. Marka ssr merupakan marka polimorfis, kodominan dan sudah banyak digunakan pada penelitian dna tanaman karet. Penelitian ini dilakukan untuk mengevaluasi kemampuan sembilan pasang marka ssr dalam membedakan tujuh belas klon tanaman karet (hevea brasiliensis) melalui pola pita hasil pcr ssr dan nilai pic-nya. Berdasarkan nilai pic dan skoring, kesembilan primer ini dapat mengamplifikasi sebagian besar klon karet yang digunakan dalam penelitian ini namun hanya enam primer yang dapat digunakan untuk membedakan klon karet sehingga dapat dimanfaatkan dalam mempercepat proses seleksi tanaman karet.
Keyword: hevea brasiliensis, pic, ssr, tanaman karet

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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