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: Perbedaan Kandungan Senyawa Resin Gaharu (Aquilaria malaccensis) Hasil Inokulasi pada Tingkat Semai dan Pohon
Abstrak: Agarwood is one of forest tree species that can be harvested for its timber and resin, which has high price. One of agarwood tree species which has ability to form agarwood with the high-quality is Aquilaria malaccensis. Information on chemicals contained in agarwood is important for the development of this product that research on chemical content of agarwood resin needs to be done. The purpose of this research is to observe changes in resin components of agarwood inoculated with agarwood inducing fungi. Induction of Fusarium solani and Fusarium oxysporum fungi was done on the stem of A. malaccensis seedlings and trees, and then the chemical components of their resins were analyzed using GCMS. The result showed that all treatments were successfully induced agarwood formation. There are 7 main chemical compounds of agarwood produced by F. solani inoculated seedlings with relative concentrations of 16.38% for isolates from Jambi, and 13.87% for isolate from Gorontalo. Innoculation of F. oxysporum on trees generated 10 agarwood main compounds with relative concentration of 13.06%.
Keyword: Fusarium oxysporum, Fusarium solani, Aquilaria malaccensis, agarwood resin derivatives

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model