Judul: Keragaman Genetik Kerabat Rambutan Liar (Nephelium spp.) di Kabupaten Sanggau, Kalimantan Barat berdasarkan Marka SSR dan ISSR.
Abstrak: Wild rambutans (Nephelium spp.) are members of Sapindaceae that produce edible fruit. This study aimed to determine the genetic diversity of wild rambutan from district Sanggau, West Kalimantan based on SSR and ISSR markers. Plant materials were colected from five subdistricts, Bonti, Jangkang, Parindu, Mukok and Kapuas, district Sanggau, West Kalimantan. There were four species and five varieties of wild rambutans in West Kalimantan, namely N. cuspidatum, N. lappaceum, N. rubescens, and N. uncinatum. The genetic diversity of wild rambutans in West Kalimantan is high. The highest genetic diversity based on SSR markers was found in Jangkang (He=0,27) and the highest genetic diversity based on ISSR was found in Bonti (He=0,18). Cluster analysis using Simple Matching (SM) index and UPGMA method based on SSR and ISSR showed that there were high similarity among species of wild rambutans in district Sanggau, West Kalimantan with similarity index ranged 0,5 – 1,0.
Keyword: Bogor Agricultural University (IPB), wild rambutan, SSR, Nephelium, ISSR, Genetic diversity

Judul: Keragaman Genetik Kapulasan (Nephelium Ramboutan-Ake) Di Kabupaten Sukabumi Dan Ciamis Berdasarkan Marka Ssr Dan Issr
Abstrak: Kapulasan (Nephelium ramboutan-ake (Labill.) Leenh) adalah kerabat dekat rambutan (N. lappaceum L.). Kedua spesies menghasilkan buah yang hampir sama, tetapi buah kapulasan memiliki kulit buah keras dan tebal serta tidak memiliki rambut. Penelitian ini bertujuan menggambarkan keragaman genetik kapulasan di Kabupaten Sukabumi dan Ciamis dengan menggunakan marka SSR dan ISSR. Sebanyak 27 individu kapulasan ditemukan dari tiga lokasi yaitu di Kecamatan Cibadak, Cijeungjing (Sukabumi) dan Kecamatan Ciamis (Ciamis). DNA dari semua individu yang ditemukan berhasil diamplifikasi dengan dua pasang primer SSR yaitu LMLY6 dan LMLY12, dan dua primer ISSR, ISSR 1 dan ISSR 3. Kapulasan mempunyai tingkat polimorfisme yang tinggi pada keempat primer yang diuji, 88.88% dari primer LMLY6, 96.29% dari primer LMLY12, 92.59% dari primer ISSR 1 dan 88.88% dari primer ISSR 3. Nilai persentase lokus polimorfik tertinggi menggunakan marka SSR adalah pada Kecamatan Ciamis yaitu 62.50% dan terendah pada Kecamatan Cibadak yaitu 37.50% serta menggunakan marka ISSR terbesar pada Kecamatan Cibadak yaitu 84.21% dan terendah pada Kecamatan Ciamis yaitu 47.37%. Analisis gerombol berdasarkan data SSR dan ISSR menggunakan indeks similaritas simple maching dan metode UPGMA mengelompokkan semua individu kapulasan dalam dua kelompok utama, tetapi individu dari lokasi berbeda mengelompok bersama. Tingkat keragaman genetik dalam populasi jauh lebih besar dibandingkan dengan keragaman antar populasi. Hasil ini mengindikasikan bahwa tanaman kapulasan adalah tanaman menyerbuk silang.
Keyword: Nephelium ramboutan-ake, SSR, ISSR, keragaman genetik

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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