Judul: Analysis of genetic and phenotypic diversity of mangosteen and related species
Abstrak: Indonesia is a megadiversity country, one of the germplasms is the mangosteen, therefore identification and characterization of the gemplasm is an important link between the conservation and utilization of plant genetic resources. The objectives of this research are to know genetic variability and relationship of mangosteen and related species, to obtain superior parental candidats of mangosteen from Tasikmalaya, and recommendation with which the most effective of characteritation method in genetic variability and clustering of mangosteen and related species
Keyword: progeny analysis, genetic variability, RAPD Markers, DNA fragments

Judul: Analisis konsistensi pola genetik empat generasi manggis (garcinia mangostana l.) berdasarkan marka ISSR
Abstrak: Mangosteen reproduces trough apomixes mechanism, from which the seed develops without fertilization. Mangosteen is an obligate apomicts and it is believed that all of its progenies may have the same genotype as their mother plant. However it was found that genetic variations occurred among mangosteen accessions. This research is aimed to study pattern of morphology variations, genetic consistency among generations and genetic variations in single plant. The study was carried out at Center for Tropical Fruit Studies (PKBT) during February – September 2009. The plant materials used four generations (P1, P2, P3, and P4) of mangosteen were taken from Wanayasa, Purwakarta according to tree height and sector (north, east, west, and west). There are three analysis: morphology, molecular by ISSR, and data. Genetic observations were conducted by using Inter Simple Sequence Repeat (ISSR) technique. Ten primers were used to amplify the genomic DNA of mangosteen. The levels of polymorphism as revealed ISSR were 70.21%. It was found that genetic and morphology variations occurred among tree of different age. Morphology variations was bigger than genetic variations among mother plant. Genetic variation also was occurred within single plant, among progenies, and between progeni and mother plant. This information may be useful to determine of optimum age of mangosteen for becoming mother plant.
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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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