Judul: Pemanfaatan Minyak Sereh dan Filtrat Trichoderma sp. untuk Mengendalikan Patogen Terbawa Benih Acacia mangium Willd.
Abstrak: This research is aimed at studying the potency of lemon grass oil and antagonistic fungus Trichoderma sp. in controlling pathogen carried by Acacia mangium Willd. The research was conducted in Forest Biotechnology Laboratory of Center for Natural Resources Reseach and Biotechnology IPB, and Cikabayan Experimental Station of IPB. The treatments were : (1) soaking seed in 0.1 % lemon grass oil, (2) soaking seeds in filtrate culture of Trichoderma sp., and (3) control (seeds without soaking). The experiment used complete randomized design with four replications. Variables observed were percentage of F. solani attack, peroxidase activity, and the length of seedling stem. The result reveals that treatments were not significantly different based on the variables observed. However, soaking seeds in filtrate culture of Trichoderma sp. tend to be better lengthen the stem seedling of A. mangium.
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Judul: Efektivitas penggunaan Trichoderma harzianum dan fungisida mankozeb untuk pengendalian Rhizoctonia solani penyebab penyakit lodoh pada Acacia Mangium
Abstrak: Berbagai cara pengendalian terhadap patogen penyakit lodoh (Rhizoctonia solani) di persemaian telah banyak dilakukan, tetapi pengendalian gabungan antara cara biologi dan kimia pada Acacia mangium belum pernah diuji. Penelitian telah dilakukan untuk menyatakan efektivitas penggunaan Trichoderma harzianum (fungi antagonis), fungisida Mankozeb ataupun gabungan antara keduanya untuk pengendalian penyakit lodoh oleh R. solani pada A. mangium. Ternyata pengendalian dengan fungisida Mankozeb lebih efektif daripada cara pengendalian lainnya. Pengendalian dengan fungisida Mankozeb mampu menurunkan serangan penyakit lodoh benih dari 100% menjadi sebesar 34.6% sedang lodoh batang yang timbul adalah sebesar 7.67%. Pengendalian terpadu gabungan T. harzianum dan fungisida Mankozeb kurang mampu memberikan hasil yang bagus dalam menekan serangan R. solani, penyebab penyakit lodoh. Hal ini diduga disebabkan oleh penggunaan dosis fungisida yang terlalu tinggi sehingga menghambat pertumbuhan T. harzianum. Penggunaan T. harzianum, fungisida Mankozeb dan gabungan keduanya belum mampu membantu peningkatan pertumbuhan semai A. mangium, khususnya tinggi dan BKT semai A. mangium. Hal ini disebabkan penggunaan T. harzianum, fungisida Mankozeb dan gabungan keduanya pada semai sampai berumur 30 hari lebih berperan dalam pengendalian penyakit lodoh daripada untuk membantu meningkatkan pertumbuhan semai A. mangium.
Keyword: Acacia mangium

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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