Judul: Variasi Kloroplas Shorea laevis Ridl. Di Kalimantan Berdasarkan Penanda Mikrosatelit
Abstrak: Shorea laevis Ridl. merupakan salah satu jenis penting dari famili Dipterocarpaceae ditinjau dari segi ekologi maupun ekonomi. Secara umum, S. laevis menyebar di Semenanjung Myanmar, Thailand, Semenanjung Malaysia, dan Indonesia (Sumatera dan Kalimantan). Penelitian ini menggunakan cpDNA dengan penanda mikrosatelit dan diamati alel serta lokus polimorfiknya yang bertujuan untuk mengetahui distribusi haplotipe cpDNA S. laevis di Kalimantan dan menduga keragaman cpDNA di dalam dan antar populasi S. laevis. Hasil analisis cpDNA berdasarkan penanda mikrosatelit terdapat empat multilokus haplotipe, yaitu A, B, C, dan D. Dua multilokus haplotipe ditemukan pada populasi Sari Bumi Kusuma dan dua multilokus haplotipe ditemukan di populasi ITCIKU. S. laevis memiliki nilai keragaman genetik (He) antara 0,046 - 0,128 dan nilai diferensiasi genetika (Gst) = 0,545. Hubungan kekerabatan terjauh dimiliki oleh populasi Sarpatim dengan Sari Bumi Kusuma, sedangkan populasi dengan jarak genetik terdekat adalah antara populasi Berau, Batu Ampar, Suka Jaya Makmur dan Bukit Bangkirai.
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Judul: Keragaman Genetik Shore laevis Ridl. di Kalimantan Berdasarkan Penanda Mikrosatelit
Abstrak: Shorea laevis Ridl. is one member of commercial species from Dipterocarpaceae family. This species is also as one of the important trees in tropical rain forest, based on ecological and economic evaluation. In general, S. laevis distributes naturally in Peninsular Myanmar and Thailand, Peninsular Malaysia, Sumatera, Aceh, and Borneo Island. The objective of this study was to cross species amplify microsatellites and to estimate genetic variation within and among populations. This study used nuclear microsatellite analysis based on observed alleles and polymorphic loci. Results showed that S. laevis had moderate value of genetic variation within population (He) = 0,4443. In general, this value of genetic variation was smaller if compared to other Shorea species that also analysed by the same method. The closest genetic relationship (smallest distance) was possessed by S. laevis populations of Bukit Bangkirai and PT. ITCIKU, while the furthermost relationship (largest distance) was possessed populations of Batu Ampar and PT. Sari Bumi Kusuma.
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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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