Judul: Effectivity of Acremonium sp. and Methyl Jasmonate to Improve Agarwood Quality of Aquilaria microcarpa.
Abstrak: Acremonium sp. and Methyl Jasmonate were able to induce the formation of agarwood. Yet, a single inoculant of either Acremonium sp. or MeJA did not induce the formation a good quality of agarwood. Therefore, an effort to improve the quality of agarwood produce should be conducted. This research was aimed to study the effectivity of Acremonium sp. in combination with MeJA to improve the quality agarwood of Aquilaria microcarpa. A. microcarpa stem was first wounded by drilling. The hole was injected by sugar solution 2%, and then inoculated by Acremonium sp. In combination treatment, Acremonium sp. was inoculated a week prior to MeJA injection. Tree fitness and agarwood quality component such as wood discolouration, fragrance level, and terpenoid accumulation were observed monthly for four months period. Acremonium sp. and MeJA influenced tree fitness throughout observation period. Acremonium sp. in combination with MeJA stimulated tree to form agarwood with better quality than the single inoculation. The terpenoids compound that was detected composed of sterol. The terpenoids accumulation associated with wood discolouration. The wood discolouration was not correlated with the fragrance level. The wood discolouration, fragrance level, and terpenoids contents were independent criteria in determining agarwood quality. Based on the classification of agarwood quality, Acremonium sp. in combination with MeJA could improve the agarwood quality from kemedangan V to kemedangan IV. Keyword: Acremonium sp., methyl jasmonate, agarwood, combination treatment, terpenoid, agarwood quality
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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: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf