Judul: Analisis Variasi Genetik Populasi Tanaman Karet (Hevea brasiliensis) Sumber Eksplan untuk Perbanyakan in vitro Berdasarkan RAPD
Abstrak: Information on genetic diversity is needed to support breeding and conservation programs. Research on genetic variation in rubber plant population (Hevea brasiliensis) with RAPD (Randomly Amplified Polymorphic DNA) technique has been performed in the Biotechnology Research Institute of Plantation Indonesia (BPBPI). The observed population include 57 of 100 genotypes that was resulted from selection of 3 parental seed groups (GT 1, PB 260 and RRIM 600). This study used 7 primers, OPA 02, OPA 07, OPA 15, OPB 04, OPC 05, OPC 11 and OPC 20. The results of research showed that RAPD technique can be used to analyze the relationship between 57 genotypes of rubber plants with 3 parental seed. The most genotypes of rubber plant had closest relationship with PB 260 clone, that is similiar with genotypes showed a good response to in vitro culture. Genetic similarity coefficient values were ranged from 62-96%. The highest genetic similarity (96%) were found between genotype 70 and genotype 78.
Keyword: 

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.
Keyword: 

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.
Keyword: