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: Analisis Sebaran Genetik Hasil Persilangan Tanaman Karet RRIM 600 dan PN 1546 Menggunakan Teknik RAPD
Abstrak: The main problem in providing recommended rubber clones for rejuvenating process is breeding cycle length that took 25-30 years. Therefore, before rejuvenated an early detection and selection for superior clones is needed. RAPD (Random Amplified Polymorphic DNA) molecular marker is one of alternative method that can be used for the selection. This research focusing on genetic diversity observation of cross hybrid rubber plant between RRIM 600 and PN 1546. This research used 56 primers that consist of 16 combination primers (named with alphabet from letter A to letter P) and 40 RAPD primers (named OPH-OPJ (1-20)). Version 2.02 of NTSys program was used as tabulation method. DNA amplification of 16 combination primer produced 5 primary candidates for molecular marker, including primer C, primer D, primer N, primer M, and primer I. Each primer has their own specification. Primer D used for RRIM 600 only. Both primer C and M used for PN 1564 only. Primer N and I used for intermediate only. DNA amplification result of 40 RAPD primers has coefficient value range between 0.89 until 0.98. At 0.89 coefficient, 27 rubber plants separated in two major groups. Dendogram analysis also showed that the elders were distantly related.
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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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