Judul: Isolasi, pengelompokkan warna dan optimasi media pertumbuhan aktonomiset selulolitik asal hutan Sulawesi Tengah
Abstrak: Sixty three isolates of Actinomycetes were isolated from soil sample of Lore Lindu National Park forest, Central Sulawesi. Those isolates were grouped into six colour groups based on the color of their colony. Some isolates produced different diffusible pigment. Eight isolates of Actinomycetes produced clearing zone. Biomass and cellulase activity of three isolates, A5D4-3, D2D2-2, and E2D1-2 were measured based on their cellulolytic index. A5D4-3 and E2D1-2 had the highest biomass when peptone was added into CMC growth media, meanwhile D2D2-2 had the highest biomass when yeast extract was added into CMC growth media. A5D4-3 had higher FPase activity (0.022 nkat/ml) than CMCase and avicelase when CMC growth media was added with peptone. D2D2-2 had higher CMCase activity (0.373 nkat/ml) than avicelase and FPase when CMC growth media was added with yeast extract. E2D1-2 had higher avicelase activity (0.012 nkat/ml) than CMCase and FPase when CMC growth media was added with peptone.
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Judul: Aktivitas Selulolitik beberapa Kapang
Abstrak: Cellulose is the main component of cell wall of plants and it is the most abundant biopolymer on earth. Generally, cellulose is degraded by microorganisms-producing cellulase. The enzyme consists of endoglucanase, exoglucanase, and cellobiase. The aim of this research was to study the cellulolytic’s ability of some molds. Fourty two fungal isolates were first examined of their cellulolytic’s ability on CMC agar. T. reesei QM6a was used as comparison strain. Certain isolate of Aspergillus niger, Aspergillus ornatus, and Paecilomyces sp. have cellulolytic index that were higher than those of other isolates. The optimum activity for CMC-ase of A. niger and A. ornatus occurred on 3 days incubation, while those of Paecilomyces sp. and T. reesei QM6a was 5 days and 2 days incubation, respectively. Of those species, A ornatus showed the highest activity of CMC-ase (0.550 nkat/ml), avisel-ase (0.077 nkat/ml), and FP-ase (0.255 nkat/ml). The optimum temperature for CMC-ase activity of A. ornatus was 30 0C, while the optimum acidity was 7.
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Judul: Pemodelan Nilai Tukar Rupiah Terhadap US Dollar Menggunakan Deret Waktu Hidden Markov Satu Waktu Sebelumnya
Abstrak: Perubahan nilai tukar Rupiah terhadap US Dollar dapat terjadi kapan saja dalam suatu periode waktu yang panjang dan perubahan yang terjadi mungkin terjadi kembali di masa mendatang. Jika penyebab kejadiannya tidak diamati secara langsung dan membentuk rantai Markov maka perubahan nilai tukar Rupiah terhadap US Dollar dapat dimodelkan dengan deret waktu Hidden Markov. Model yang dibahas dalam karya ilmiah ini adalah model deret waktu Hidden Markov satu waktu sebelumnya di mana nilai tukar Rupiah saat ini selain bergantung pada nilai tukar Rupiah satu waktu sebelumnya, juga bergantung pada faktor penyebab saat ini dan satu waktu sebelumnya. Parameter model diduga menggunakan metode Maximum Likelihood dan perhitungannya digunakan algoritma iteratif Expectation Maximization (EM). Untuk mempermudah proses pendugaan parameter, proses komputasi numerik dilakukan dengan menggunakan software Mathematica 6. Setelah penduga parameter didapatkan maka dapat dihitung nilai tukar Rupiah terhadap US Dollar yang akan datang. Dari hasil yang diperoleh, model deret waktu Hidden Markov satu waktu sebelumnya dapat memodelkan perubahan nilai tukar Rupiah terhadap US Dollar dengan sangat baik. Ini dilihat dari nilai galat maksimum adalah 807,6963 (5,6773 %) dan nilai galat minimum adalah 0,2934 (0,0032 %).
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