Judul: Analisis Kekerabatan Progeni Hasil Persilangan Durio zibethinus Murr. x Durio kutejensis Taman Buah Mekarsari Berdasarkan Karakter Vegetatif dan Marka Mikrosatelit.
Abstrak: Durian (Durio sp.) merupakan tanaman buah asli Indonesia dari famili Malvaceae yang memiliki keragaman genetik tinggi di alam. Analisis keragaman genetik durian menjadi informasi dasar untuk pelaksanaan kegiatan seleksi dan persilangan lanjutan dalam program pemuliaan durian. Marka mikrosatelit merupakan salah satu metode analisis penanda molekuler kodominan. Penelitian ini bertujuan mengidentifikasi kekerabatan 5 aksesi durian Mekarsari hasil persilangan Durio zibethinus Murr. (Durian Matahari) x Durio kutejensis (Lai) dan kedua tetuanya dengan 1 outgrup Durio dulcis berdasarkan karakter vegetatif dan marka mikrosatelit. DNA diisolasi menggunakan DNeasy® Plant Pro Kit. Delapan primer mikrosatelit yang digunakan adalah MS1CT-5FD2, MS1CT-6FA1, MS1CT-12FB2, MS1GT-15FB1, MS1GT-22FA2, MS1GT-27FC1, MS1AAC-5FC2, MS1AAC- 19FD1. Analisis marka mikrosatelit menggunakan PCR Type-it Multiplex Master Mix. Analisis filogenetik menggunakan metode algoritma UPGMA (Unweighted Pair Group Method with Arithmetic Mean) pada software Phylip. Rata-rata alel yang didapat dari 8 lokus yang diuji ± 7. Terdapat 2 pasang lokus yang memiliki NA paling tinggi yaitu lokus MS1AAC-19 dan MS1GT-22 yang memiliki alel masing-masing 9 serta lokus MS1GT-15 dan MS1GT-27 yang masing-masing memiliki alel 8. DPR 1, DPR 6, DPR 7, DPR 8, dan DPR 13 memiliki jarak kekerabatan yang dekat dengan durian Matahari sebagai tetua betina secara genetik dan morfologi dibanding Lai.
Keyword: Alel, hibridisasi, lokus, simple sequence repeats

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.
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: