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: Genetic structure and variation of five Shorea leprosula natural populations based on microsatellite marker
Abstrak: Shorea leprosula is an economically and ecologically important timber species and one of the most common tropical lowland rain forest tree species in Southeastern Asia. Eleven microsatellites DNA loci were used to investigate the genetic structure and diversity among five natural populations from Sumatera (CS and NS), Peninsular Malaysia (SM) and Borneo (WKa and WKb). Results indicated that expected mean heterozygosity (He) was high (0.721) with values ranging from 0.542 to 0.788, with the highest values found in the populations from west Kalimantan (WKb). Most of the populations showed high and positive fixation indices indicating excess of homozygotes. This implies a high level of inbreeding which may be caused by selfing or/and mating among relatives. A gene diversity analysis showed that 89.9% of the variation was harbored within populations and 11.1% (FST= 0.111) was due to differences among populations. STRUCTURE analysis showed that five natural populations were clustered into two main groups namely: i) Sumatera-Peninsular Malaysia, and ii) Borneo. Mean gene flow (Nm) was high (2.00) indicating extensive gene flow in the past among the natural populations. Three populations (WKb, NS and SM) were identified to be genetically unique and we recommended for further consideration in formulation of genetic conservation strategies.
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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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