Judul: Analisis Keragaman Genetik Ganoderma spp. Menggunakan Penanda Molekuler Random Amplified Polymorphic DNA (RAPD)
Abstrak: Information on genetic diversity of Ganoderma spp. as a cause of root rot disease in crops is necessary in the development of protection technique from Ganoderma disease. The objectives of this research is to study the genetic diversity of Ganoderma spp. that associated with cacao and its shade trees (sengon, mahoni, and lamtoro) by random amplified polymorphic DNA (RAPD) marker analysis. DNA amplification using 10 arbitrary oligonucleotide primers produced 220 polymorphic DNA fragments which are 100% polymorphic. The cluster analysis showed that 45 number of Ganoderma samples had a high variability with the coefficient value ranged from 0.71 to 0.91. Further analysis using Winboot software showed that three groups of Ganoderma spp. had a high degree of confidence (>50%), which were Ganoderma samples from sengon Tasikmalaya, sengon Palembang, and mahoni Jember; whereas the other groups of samples had a low degree of confidence (<50%).
Keyword: 

Judul: Genetic Diversity Analysis of Oil Palm (Elaeis guineensis Jacq) Based on RAPD (Random Amplified Polymorphic DNA) Using Primer OPJ.
Abstrak: Random Amplified Polymorphic DNA (RAPD) dapat menjadi salah satu alternatif untuk menyeleksi tanaman kelapa sawit berproduktivitas tinggi dan tahan terhadap Ganoderma sp. Pada penelitian ini RAPD digunakan untuk mempelajari keragaman genetik 58 pohon kelapa sawit. Tahapan penelitian dimulai dari isolasi DNA, amplifikasi menggunakan primer OPJ, dan analisis filogenetik menggunakan metode UPGMA (Unweighted Pair Group Method Arithmatic Mean) dengan software NTSYS. DNA hasil isolasi memiliki kualitas yang baik berdasarkan analisis spektofotometri dan elektroforesis gel. Amplifikasi DNA dengan 20 primer seri OPJ menghasilkan 1.592 pita DNA dari 115 lokus, sebesar 68% diantaranya merupakan pita polimorfik. Analisis kemiripan genetik menunjukkan nilai koefisien kemiripan genetik sebesar 49% - 95%. Hasil pengelompokkan populasi kelapa sawit pada nilai kemiripan genetikRandom Amplified Polymorphic DNA (RAPD) dapat menjadi salah satu alternatif untuk menyeleksi tanaman kelapa sawit berproduktivitas tinggi dan tahan terhadap Ganoderma sp. Pada penelitian ini RAPD digunakan untuk mempelajari keragaman genetik 58 pohon kelapa sawit. Tahapan penelitian dimulai dari isolasi DNA, amplifikasi menggunakan primer OPJ, dan analisis filogenetik menggunakan metode UPGMA (Unweighted Pair Group Method Arithmatic Mean) dengan software NTSYS. DNA hasil isolasi memiliki kualitas yang baik berdasarkan analisis spektofotometri dan elektroforesis gel. Amplifikasi DNA dengan 20 primer seri OPJ menghasilkan 1.592 pita DNA dari 115 lokus, sebesar 68% diantaranya merupakan pita polimorfik. Analisis kemiripan genetik menunjukkan nilai koefisien kemiripan genetik sebesar 49% - 95%. Hasil pengelompokkan populasi kelapa sawit pada nilai kemiripan genetik
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: