Judul: Studi Kekerabatan dan Morfologi Padi Lokal Adan Hasil Mutasi Sinar Gamma
Abstrak: Adan rice is a variety of rice grown in the highlands of East Kalimantan with only once harvest every year. Mutation by gamma rays on this Adan rice make its age of ripening more early in order to increase its productivity. Analysis of molecular and morphological from Adan rice mutant has not been done before. That analysis needs to be conducted to compare the differences between wildtype of rice and mutant Adan rice. This research aimed at showed diversity or similarity of wildtype Adan rice and mutant Adan rice used microsatellite or SSR markers. The dendogram obtained from molecular analysis SSR showed that wildtype Adan rice and mutant Adan rice (BMA 1-9) are located in same large group with 58% similarity coefficient. Mutant rice is similar to the wildtype in the BMA 3 and BMA 9 groups. Mutations with gamma rays shortened on flowering and increased the number of productive tillers to 96%. Mutations of gamma rays also shortened the height of rice mutants until 20%, reduced the total number of tillers from mutant rice until 44%, and reduced the number of leaf yellowing mutant rice until 66%.
Keyword: similarity coefficient, microsatellite (SSR), Adan rice

Judul: Seleksi BC2F2 Padi Adan x Nipponbare Berbasis Marka Mikrosatelit dan Pengamatan Karakter Agronomi
Abstrak: Padi Adan merupakan padi lokal Kecamatan Krayan (Kalimantan Timur) memiliki nilai jual tinggi dengan bentuk berasnya kecil, bundar, halus, beraroma harum, dan cita rasa baik, namun memiliki umur 5-6 bulan. Perbaikan genetik kultivar padi Adan untuk meningkatkan potensi hasil padi Adan telah dilakukan. Penelitian ini bertujuan menyeleksi galur tanaman BC2F2 padi Adan x Nipponbare yang memiliki gen umur berbunga (Hd2) menggunakan marka molekuler serta analisis karakter agronomi tanaman padi tersebut. Padi BC2F2 Adan x Nipponbare yang digunakan merupakan hasil persilangan balik antara BC1F2 Adan x Nipponbare dan Tetua Adan. Sebanyak 200 individu BC2F2 diseleksi secara molekuler menggunakan marka Simple Sequence Repeat (SSR) RM1362, dan RM7601. Berdasarkan analisis molekuler telah dipilih 43 individu BC2F2 yang memiliki pola genotipe homozigot gen Nipponbare. Berdasarkan pengamatan agronomi, terlihat bahwa tanaman BC2F2 tidak berbeda nyata dalam hal jumlah gabah isi dengan tetua Adan, serta memiliki umur berbunga lebih cepat 10 hari dari tetua sebelumnya.
Keyword: Adan, Nipponbare, Padi, SSR

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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