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: Korelasi Kadar Seskuiterpena dengan Mutu Gaharu Standar Nasional Indonesia
Abstrak: Sesquiterpene content of agarwoods (Aquilaria malaccensis) of 3 different commercial grades, namely kemedangan, super tanggung A and, super A, representing low to high grades, has been identified. However, parameters designated in Indonesia National Standard (SNI) are merely qualitative, based on some physical properties of this commodity. The purpose of this study was to obtain quantitative chemical parameters in order to complement the existing parameters of SNI. In the identification step, agarwood samples were extracted using 2 different solvents, i.e. ethyl acetate and acetone. Gas chromatography-mass spectrophotometer analyses indicated that sesquiterpenes were present in all agarwood grades. Resin contents in acetone extract for kemedangan, super tanggung A, and super A were 8.5%, 13.3%, and 19.9%, respectively. Sesquiterpene content of acetone extract for kemedangan, super tanggung A, and super A were 6.1%, 7.1%, and 11.9%, respectively, and for ethyl acetate extract were 5.4%, 9.6%, and 13.4%. Resin and sesquiterpene content in acetone extracts consistently increased corresponding to the quality of commercial gaharu. A marker compound obtained in all the quality of agarwoods and agarwood extract was aromadendrene. Aromadendrene content in acetone extract from the lowest to the highest grades of commercial agarwoods were 1.2%, 1.6%, and 2.2%, respectively.
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Judul: Penyelesaian Masalah Rotasi Aliran Fluida Kental Von Karman Menggunakan Metode Homotopi
Abstrak: Von Karman equation is an equation that describes fluid viscous flow induced by infinite disk rotation. By assuming steady flow and laminar, viscous incompressible fluid flow is represented in Von Karman equation by an angular velocity and the vertical direction velocity as the independent variables. Von Karman equation is a nonlinear problem that is solved using the homotopy method. The use of homotopy method is done by defining an homotopy function that requires auxiliary parameters to control the convergent region of the solution. The solution is a recursive formula with given initial conditions. Using software based-functional shows that velocity components converge to a value.
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