Judul: Diversity and genetic structure of southeast sulawesi  teak populations based on microsat ellite markers
Abstrak: The aim of this research was to study diversity and genetic population structure, dynamical aspect of gene flow through pollens and seeds dispersal and also mating system. This study was carried out at three locations of teak stand populations which indicated human disturbance level using ten markers microsatellite (AGT10, AC44C AC10, AG14, ATC02, AC28, AAG10, and CPIMS). A total of 46 alleles were detected, with six the highest number allele at AAG10 and AG16 loci. The mean value of polymorphic information content (PIC) of the 10 loci ranged from 0.442 to 0.580.
Keyword: Tectona grandis, Microsatellite, Genetic diversity, Genetic structure, Gene flow, Mating system, Sistem reproduksi seksual tanaman

Judul: Keragaman Genetik Pinus merkusii Jungh. et de Vriese Strain Tapanuli berdasarkan Penanda Mikrosatelit
Abstrak: Pinus merkusii of Tapanuli strain, which grows naturally in Tapanuli area to the south of Toba Lake, has decreased considerably due to intensive logging. This research aimed at investigating genetic diversity of strain Tapanuli Pine using microsatellite markers on its three populations, i.e. Dolok Tusam Timur, Lobugala, and Parinsoran. Leaf samples were extracted using combined CTAB (cetyl trimethyl ammonium bromide) and DNeasy plant mini kit, then amplified using seven specific microsatellite primers from P. merkusii Aceh strain, i.e. pm01, pm04, pm05, pm07, pm08, pm09a, and pm12. Those primers could amplify polymorphic fragments with different sizes than reported before. Estimation of genetic diversity parameters showed that Lobugala population has the highest heterozygosity (He = 0.4693) followed by Dolok Tusam Timur (He = 0.4614) and Parinsoran (He = 0.4316). Lobugala population was closely related to Parinsoran with 0.0617 genetic distance, and separated from Dolok Tusam Timur by 0.3798 genetic distance. Partition of genetic variation showed that 81% was found within population, and only 18% was among population
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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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