Judul: Seleksi Jenis Limbah Kapas sebagai Media Produksi Jamur Merang (Volvariella volvacea (Bull. ex. Fr) Sing)
Abstrak: Cotton waste from spinning is one of the substrate for the growth of paddy straw mushroom. The kinds of cotton waste include trash cotton, AC cotton, cotton without dust, and cotton with dust which have cellulose concentrations of 52.76%, 73.70%, 52.70%, and 78.70% respectively. According to straw mushroom’s farmer, trash cotton gave higher production compared to other kinds of cotton. Therefore an experiment should be carried out to get correct information about the best kinds of cotton for the production of paddy straw mushroom. The experiment was done twice, i.e in April – July 2008 and July – October 2008. The compost substrate (3 000 g) consisted of trash cotton and straw with ratio of 2:1 (T2J1) and of 1:1 (T1J1) respectively, and similar ratio of cotton with dust and straw (D2J1 and D1J1) respectively. The substrates were inoculated with 2.5% of spawn and were kept growth until the end of harvest. Substrate D2J1 produced higher number and bigger of fruit bodies (in height and diameter) compared with those of the other three substrates, each with the value of biological efficiency (EB) 21.22% for the first experiment and 23.03% for the second one. In the first experiment, EB values of T1J1 and D1J1 were 16.76% and 15.63% respectively, while in the second experiment those of each 5.84% and 12.45%. The lowest EB value was found in T2J1 for both experiments i.e 16.76% and 0.22%, respectively. The low EB value was probably due to incomplete vegetative phase, along with the contamination of Trichoderma in the first experiment and the faster decomposition in the second experiment.
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Judul: Growth and Production Of Oyster Mushroom (Pleurotus spp.) on Media Containing Sengon Wood, Coffee Skin, and Straw
Abstrak: Jamur tiram merupakan salah satu kelompok jamur kayu yang dapat dimakan (edible). Pemanfaatan limbah hasil kehutanan dan pertanian seperti serbuk gergaji kayu sengon, kulit kopi, dan jerami menjadi salah satu yang dapat dimanfaatkan sebagai media tanam dalam kultivasi jamur tiram guna memaksimalkan limbah yang ramah lingkungan. Penelitian bertujuan untuk menganalisis pengaruh media yang mengandung kayu sengon, kulit kopi, dan jerami terhadap pertumbuhan dan produksi jamur tiram. Penelitian menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal dengan 3 perlakuan media yaitu formula 1 (kayu sengon dan kulit kopi), formula 2 (kayu sengon dan jerami), dan kontrol (kayu sengon). Hasil penelitian menunjukkan bahwa fase vegetatif jamur paling singkat diperoleh pada media formula 2 (15-18 hari). Fase generatif jamur yang membutuhkan waktu paling cepat masa panen diperoleh pada media kontrol (9-11 hari). Total bobot basah jamur terbesar dan nilai efisiensi biologis tertinggi diperoleh pada media kontrol (229,10 g) dengan nilai efisiensi biologis 79,0% pada jamur tiram putih (Pleurotus ostreatus) dan (331,70 g) pada jamur tiram cokelat (Pleurotus cystidiosus) dengan nilai efisiensi biologis 114,4%., Oyster mushroom is a group of edible wood mushrooms. Utilization of forestry and agricultural waste such as sawdust from sengon wood, coffee husks, and straw is one that can be used as a planting medium in oyster mushroom cultivation in order to maximize environmentally friendly waste. This study aims to analyze the effect of media containing sengon wood, coffee skin, and straw on the growth and production of oyster mushrooms. The study used a single factor completely randomized design (CRD) with 3 media treatments, namely formula 1 (sengon wood and coffee husk), formula 2 (sengon wood and straw), and control (sengon wood). The results showed that the shortest fungal vegetative phase was obtained in formula 2 media (15-18 days). The fungal generative phase wich required the fastest time to harvest was obtained in control media (9-11 days). The highest total wet weight of mushrooms and the highest biological efficiency value obtained on control media (229,10 g) with a biological efficiency value of 79,0% on white oyster mushroom (Pleurotus ostreatus) and (331,70 g) on brown oyster mushroom (Pleurotus cystidiosus) with a biological efficiency value of 114,4%.
Keyword: brown oyster mushroom, coffee husk, sengon wood, straw, white oyster mushroom.

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