Judul: Effectivity of Acremonium sp. and Fusarium sp. as Double Inducer for Agarwood Formation in Aquilaria microcarpa.
Abstrak: Aquilaria microcarpa is one of the agarwood trees that produced the best quality of agar. The agar was formed on the infected tree. Acremonium sp. and Fusarium sp. are usually used as inoculant for agar production. Yet, Acremonium as single inoculant was not able to induce the tree to produce a good quality of agarwood. Therefore, Acremonium sp. was combined with Fusarium sp. (served as double inoculant) to induce agar production. This research was aimed at studying the effectiviness of double inoculants to improve quality of agar produce comparing to its single inoculant. A. microcarpa stem was first drilled to make holes, then the hole was filled with sugar solution (2%), inoculated by the first inoculant (A= Acremonium sp. or F= Fusarium sp.) and followed by second inoculant (F= Fusarium sp. or A= Acremonium sp.). Second inoculant was given one week after the first inoculant. Those inoculants were given in different holes in the same tree. Therefore, the treatments were composed of AF and FA as double inoculants, and A or F as a single inoculant. Effectivity of inoculation was determined on the bases of tree fitness and quality criteria such as wood discoloration (intensity, length and wide of browning zone), fragrance level and terpenoid contents. The effectivity was observed each month for four months period. Based on intensity of wood discoloration, length and wide of wood discoloration zone, and fragrance level, double inoculants tended to give a better result than single inoculant. AF stimulated fragrance formation that level and frequency of inoculation point with moderate and strongly fragrance were higher then those of FA. All inoculants, except single inoculant A, stimulated tree to produce triterpenoid. Key words: agarwood, Acremonium sp., Fusarium sp., single inoculant, double inoculant, terpenoid compound
Keyword: 

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