Judul: Indentifikasi bibit asal biji dan bibit klonal durian (Duria zibethina Murray) berdasarkan ciri morfologi bagian vegetatif
Abstrak: Penelitian bertujuan mengidentifikasi bibit asal biji durian lokal Bogor varietas Entin, Koclak, Pagar, dan Mentega, mengidentifikasi bibit klonal durian dengan batang atas varietas unggul nasional yang diokulasikan dengan varietas lokal berdasarkan ciri morfologi bagian vegetatif, serta mengetabui pertumbuhan tunas baru setiap varietas yang diokulasikan. Penelitian dilakukan di kebun percobaan IPB, Baranangsiang Bogor. Penelitian menggunakan bibit durian asal biji varietas Entin, Koclak, Pagar, dan Mentega sebagai batang bawab serta Hepe, Monthong, Entin, Koclak, Pagar, dan Mentega sebagai batang atas. Jumlah masing-masing varietas batang bawab yang diokulasi dengan setiap varietas batang atas ialah sebanyak 35 buah bibit. Okulasi yang dilakukan menggunakan metode patch budding. Ciri morfologi yang diamati ialab bentuk mabkota bibit, sudut percabangan, warna batang utama, distribusi cabang, bentuk daun, bentuk ]ekukan ujung daun, bentuk lekukan pangkal daun, urat tulang daun, wama permukaan atas daun, warna permukaan bawab daun, permukaan antar tulang daun, dan lengkung daun. Analisis yang dilakukan adalab penelusuran kehomogenan dengan uji khi-kuadrat, sedangkan pembentukan gerombol varietas dilakukan dengan menggunakan analisis gerombol (cluster analysis) berdasarkan ciri morfologi setiap varietas. Analisis komponen utama (principal component analysis) dilakukan untuk mengetabui ciri yang dapat dijadikan pembeda antar varietas serta menentukan posisi varietas pada diagram pencar. Penentuan komponen utama diwakili oleh keragaman keseluruhan data minimal 75%. Untuk mengetabui pengaruh batang bawab dan batang atas dilakukan analisis ragam faktorial rancangan acak lengkap. Uji lanjut dengan menggunakan analisis Duncan.
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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: 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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