Judul: Variasi Genetik, Isotop, dan Spektra Near Infrared (NIR) Kayu Jati di Jawa
Abstrak: Penggunaan teknologi genetik, isotop dan near infrared (NIR) merupakan metode baru yang mungkin dapat dikembangkan dan diterapkan di masa datang untuk sertifikasi lacak balak dan pembuktian kasus kejahatan hutan, seperti illegal logging. Penelitian terdahulu khususnya untuk DNA, masih memiliki beberapa kekurangan, menggunakan sampel berupa daun, dari sedikit lokasi dan berbasis individu sehingga kurang mewakili variasi genetik jati di Jawa dan belum cukup menyediakan informasi yang diperlukan bagi lacak balak. Analisis genetik menggunakan contoh uji kayu hingga saat ini masih jarang dilakukan. Berbagai alasan mendasari mengapa contoh uji kayu jarang digunakan karena selain memiliki tingkat kesulitan yang tinggi, di dalam kayu sendiri terkandung sifat degraded-DNA yaitu DNA tidak tersebar merata pada semua jaringan kayu.
Keyword: Teak, DNA, Chemical component, NIR Spectra

Judul: Variasi Genetika Jati Jawa Berdasarkan Metode Random Amplified Polymorphic DNA (RAPD)
Abstrak: Information on genetic variation of teak in Java at present is still limited. Existing data mostly were based on isozyme analysis, on few localized population, and using leaves as sample materials. In this study usage of RAPD (Random Amplified Polymorphic DNA) as one of DNA markers, and teak wood as material to study teak genetic diversity could enrich the available information. Samples were collected from nine Forest Management Unit (FMU) representing three provinces in Java, i.e. FMU Banten, FMU Ciamis and FMU Indramayu of West Java province, FMU Cepu, FMU Kebonharjo, FMU Kendal and FMU Randublatung of Central Java province, FMU Bojonegoro and FMU Ngawi of East Java province. Leaves DNA were extracted using CTAB method and woods DNA were extracted using CTAB (Cethyl Trimethyl Amonium Bromide) method, while RAPD analysis were done using four selected primers, i.e. OPY2, OPY9, OPO13 and OPY11 . Generated data were then analyzed using POPGENE version 3.2 and NTSYS 2.02. Results showed that teak genetic diversity in Java as measured from heterozygosity level ranged from 0,0614 (FMU Ngawi) to 0,2753 (FMU Indramayu). Dendrogram based on calculated Nei’s genetic distances clustered the populations into two main groups, i.e. West Java province and Central-East Java province. Amplified DNA from wood comprised only of small size fragments (maximum 500bp) as compared to those of leaves (maximum 2500bp). If wood is going to be used as material for fingerprinting traded forest products, a refinement method in DNA analysis should be done
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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