Judul: Pengaruh Delignifikasi Menggunakan Phanerochaete chrysosporium dan Hidrolisis oleh Kapang Selulolitik terhadap Kualitas Tongkol Jagung sebagai Pakan Ternak
Abstrak: Concorb was one of the agricultural waste that has potency for ruminant feed. Concorb has high fiber content, but it has limited application since its low digestibility and protein content. Lignin in corncob should be liberate from cellulose and hemicellulose in the fiber substances. This research used white-root fungus of Phanerochaete chrysosporium for delignification and fungi Aspergillus niger and Trichoderma viride for hydrolysis the delignified corncob to increase its digestibility as feed. Urea and ammonium sulphate were added to enrich the corncob during hydrolysis in solid-state cultivation. After 20 days of biodelignification, 17.76 % of lignin was removed. Cultivation of delignified corncob by cellulolytic fungi increased the total and reducing sugar contents. The best hydrolysis treatment obtained from T. viride enriched with ammonium sulphate while A. niger with urea. T. viride increased 14.11 % of dry matter and 13.76 % of organic matter digestibilities. A. niger increased 15.03 % of dry matter and 8.11 % of organic matter digestibilities. Increasing of oligosacaride content made hydrolized corncob as prebiotic for better feed quality. Mixing isolates between A. niger and T. viride hydrolysis is expected to give better results in next research.
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Judul: Biodelignifikasi Tongkol Jagung Menggunakan Fungi Pelapuk Putih (White Rot Fungi)
Abstrak: Corncob has big potency to be converted become simple sugar such as glucose and xylose which turn can be used as raw material for various products for instance sorbitol and xylitol. Biodelignification is a process to remove lignin and to make fibre free from this subtance by using microorganism like mould, bacteria or enzyme. Delignification need to be done because lignin is main barrier at cellulose hydrolysis process. Some types white rot fungi often applied for delignification are Schizophyllum commune, Phanerochaete chrysosporium and isolate Pleurotus EB9. The aims of this research is to obtain the best type of white rot fungi and to get optimum concentration of mycelial and concentration of glucose which is added and optimum incubation time of chosen best fungi. The result of preliminary research that corncob delignification by fungi Phanerochaete chrysosporium had highest decreasing of lignin content that was 26.07% and degradation of dry weight that is 28.22%. Therefore, Phanerochaete chrysosporium was chosen to be used in main research. Result of main research showed that optimum condition for delignification of corncob by Phanerochaete chrysosporium was incubation time 24.25 days, quantity of mycelial 1.89 ml/10 g substrate and number of glucoses added 0.23 g/10 g substrate. From this condition the value of lignin rate ratio to holocellulose was 0.210689 g/g.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.