Judul: Analisis Keragaman Beberapa Genotipe Durian (Durio zibethinus Murr.) Menggunakan Penanda Morfologi dan Molekuler (ISSR).
Abstrak: Indonesia is one of the durian diversity center. Evaluation and characterization activities should be conducted to identify the genotipes in order to differentiate the individual plant in the spesies. Genetic variation of 21 collected genotipes of Indonesia Agency for Agricultural Research and Development (IAARD) Cipaku orchard, Bogor was evaluated using morphological and Inter Simple Sequence Repeat (ISSR) markers. Variability analysis based on 22 morphological characters gained 64 (100%) polymorphism. Molecular analysis using ten primers of ISSR amplified 48 locus. The 39 locus (81.25%) were polymorphic and the 9 locus (18.75%) were monomorphic, respectively. Both of the markers have different clustering, therefore they should be analysed using Joint Analysis. The result of the study showed genetic variability among 21 genotipes was grouped into 2 clusters on 0.51 similarity coefficient. The first group (A) consisted of the genotipe from Indonesia and the second group (B) consisted of Kanjau genotipe from Thailand with matrix correlation value was 0.83. Kanjau genotipe was suggested as a candidate in durian breeding programme, in order to increase Indonesian durian value in the future.
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Judul: Analisis keanekaragaman genetik durian lokal serang berdasarkan penanda morfologi, isozim, dan gabungan morfologi-isozim
Abstrak: Serang regency was known has high diversity of Durian (Durio zibethinus Murr.) landraces. In order to elucidate the genetics variability of the diversity, eighteen iandraces from four locations were subjected to morphological studies and isoenzymes analysis. The obtained data were ana:yzed for genetics relationshii) among landraces base on morphological and isoenzymes characters and compatibility between morphological and isoenzymes characters. Base on twelve morp:1ological characters there were 58 % of dissimilarity level indicates medium morphological variability. lsoenzymes analysis by using 7 proteins resulted 39 bands, and genetics variability of evaluated tree5 were 93 % of dissimilarity level. The concurrence analysis on morphological and isoenzymes analysis result, showed the very weak Rohlf correlation value (r=0,57). This result vVas indicated that grouping of durian landraces should be using joint of rnorphological-isozyme analysis. Joint morphological-isozyme cluster analysis showed that genetics variability among evaluated trees were 58 % of dissimilarity level, and at 51 % level dissimilarity, the durian landraces in Serang Regency should be r;lassified into four groups i.e., 1) Seureuh, Pedes, Sawah, Paok, (2) Balingbin\j, Emas, Puso, Tolaksana, Potret, Liter, Maslai, Onder, TM, (3) Belu, Carnal, and 4) Montong, Chanee, and Rampayak.
Keyword: Plan breeding, Isozyms, Genetic diversity, Durian (Durio zibethinus Murr.), morphological markers, isozyme analysis, genetic diversity.

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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