Judul: Genetic Variation of Planted andNatural Agarwood Assessed by Microsatellite.
Abstrak: damar wangidengan keharuman yang khas,sehinggabanyakdigunakan sebagai bahan baku industri parfum, obat-obatan, kosmetik, dupa, pengawet serta untuk keperluan ritual keagamaan. Eksploitasi gaharu yang berlebihanmengakibatkan kelangkaan dan hilangnya pohon (genotipe) unggul. Kelangkaan ini menyebabkan gaharu masuk kedalam daftar CITES Apendiks II, dengankonsekuensinyayaitupenjualan ekspor dan impor gaharu diaturolehkuota.Akan tetapi, kuotainitidak membedakan gaharu alami atau budidayasehingga masihmendorong terjadinyapraktek penebangan liar.Olehkarenaituperludilakukanupayapengendalian yang efektfterhadapasalusulkayugaharu. Akhir-akhirinipenggunaanpenanda DNA menjadipentinguntukmemverifikasiasal-usulkayudanbahantanamankarenasifatnya yang sulitdimanipulasisehinggaperludiujicobapadakayugaharu.Penelitianinibertujuanuntuk 1) melakukanamplifikasisilang primer mikrosatelitAquilariacrassnakejenisgaharulainnya, dan 2) mendugaasalusulkayugaharuyang diperdagangkan di pasaran.Bahanpenelitianyaitupopulasigaharudarihutanalamdantanamansertakayugaharu yang tidakdiketahuiasal-usulnya.Primer mikrosatelitA.crassna yang digunakandalamamplifikasi DNA gaharuadaempatmacam, yaitu 6pa18 (180-210 bp), 10pa17 (152-156 bp), 16pa17 (143-155 bp), dan 71pa17 (152-224 bp).Berdasarkanhasilpengamatandidapatkanbahwasemuajenissampelgaharubaikdarihutan alammaupunhutantanamandapatmengamplifikasisilangpadarentangukuranfragmen DNA yang diharapkan.Analisisgenetikmenunjukkannilaikeragamangenetik (He) dalampopulasigaharusebesar He=0.5443 (hutantanaman), dan He=0.4642 (hutanalam). Nilaikeragamangenetiktersebutdapatdigunakansebagaiinformasiilmiahuntukupayapengko nservasiangaharu.PadadendrogramNtsys (analisisklaster) terlihatadanyapengelompokangaharuasalhutantanamandanhutanalam, dimanasampelpotongan kayu gaharu dengan asal-usul tidak jelas mengelompokke gaharudari hutanalam. Hal inimengindikasikanbahwakayu gaharu yang diperdagangkan masih berasal dari hutan alam.
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Judul: Keragaman Genetik Tanaman Penghasil Gaharu Aquilaria malaccensis berdasarkan Penanda Mikrosatelit
Abstrak: Aquilaria malaccensis is a high quality agarwood producing tree of which population in nature has become rare and almost extinct due to over-exploitation. This research aim to estimate the genetic variation of innoculated A.malaccensis seedling and tree populations using microsatellite marker and to determine the correlation between the plant genotypes and the agarwood components based on analysis using GCMS. DNA was extracted using Dneasy plant mini kit from QIAGEN, and then amplified using 4 microsatellite primer pairs, i.e. 6pa18, 10pa17, 14pa17, and 16pa17. However, only two primer pairs, i.e. 6pa18 and 16pa17 were able to cross-amplify and produced polymorphic fragments with different sizes. In microsatellite locus of 16pa17 the presence of one specific allele was detected which could differentiate the plant that potentially able to produce the large amount of agarwood. The estimated value of genetic variation of the populations studied was categorized as high (He = 0.31). This variation was spread as much as 63% within populations and 37% among populations.
Keyword: microsatellite, genetic variation, genetic structure, A.malaccensis

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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