Judul: Konservasi Tumbuhan Pasak bumi (Eurycoma longifolia Jack.) melalui Kultur In Vitro
Abstrak: Tumbuhan pasak bumi (Eurycoma longifolia Jack.) banyak dimanfaatkan oleh masyarakat sebagai afrodisiak dan antimalaria karena kandungan senyawa turunan eurycomanone di dalamnya. Populasi pasak bumi di alam terus menurun dan statusnya langka menurut Rifai (1992), sehingga dibutuhkan upaya konservasi spesies melalui perbanyakan tanaman. Kultur in vitro dilakukan menggunakan eksplan berupa jaringan titik tumbuh, daun dan biji. Persentase kelangsungan hidup tertinggi (37.5%) diperoleh dengan media Murashige dan Skoog (MS) dengan metode sterilisasi menggunakan larutan bakterisida dan fungisida 2 g/ 100 ml selama 1 jam, kemudian direndam dalam amoxicillin 100 mg/ ml selama 45-60 menit di luar Laminar Air Flow dan sterilisasi dalam menggunakan larutan HgCl2 0.02 g/ 100 ml selama 15 menit, lalu eksplan direndam menggunakan larutan chlorox dengan konsentrasi 10% selama 15 menit dilanjutkan dengan pembilasan menggunakan air steril sebanyak empat kali. Proses penyelamatan eksplan yang dilakukan memiliki persentase keberhasilan sebesar 8.3%. Upaya konservasi pasak bumi secara generatif melalui perkecambahan biji memiliki persen hidup kecambah sebesar 60%. Perbanyakan secara vegetatif melalui cangkok belum berhasil dilakukan. Karantina dan perlakuan pendahuluan yang dilakukan berhasil menimbulkan respon berupa pertumbuhan tunas pucuk yang dapat digunakan sebagai bahan eksplan titik tumbuh.
Keyword: Eksplan, Eurycoma longifolia, Kultur in vitro, sterilisasi

Judul: Teknik Perbanyakan dan Kekerabatan Genetik Pasak Bumi (Eurycoma longifolia Jack)
Abstrak: Pasak bumi (Eurycoma longifolia Jack) is a shrubs growing wildly in the forests of Southeast Asia and widely used throughout the region because of its medicinal properties. Uncontrolled harvesting of wild-grown trees has led to rapid decrease of natural populations, as well as causing a potential decrease in genetic diversity. The objectives of this research were 1). To get information about propagation technique of pasak bumi by seed and stem cutting and its suitable growing medium and 2). To estimate genetic relatedness of pasak bumi propagated by seed collected from Jambi using RAPD marker. Propagation by seed produced low germination percentage (14-34%) at different media. Seedling planted in pure carbonized rice husk medium produced the best growth variabel on vigority, primary root number, secondary root number, primary root length and secondary root length. Result from stem cutting showed that medium significantly improved secondary root length, while rooting percentage, primary root length and the number of root significantly was affected by Rootone F treatment. Genetic relatedness by RAPD marker showed that pasak bumi propagated by seed has high value of genetic diversity within population (He = 0,3076) and 78,57% all the loci tested were polimorphic, clustering analysis showed that the plant can be grouped into two group.
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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