Judul: Isolasi dan Pencirian Xilanase dari Bakteri Asal Tanah Taman Nasional Bukit Duabelas, Jambi, Indonesia
Abstrak: Xilanase merupakan enzim pendegradasi xilan yang berguna dalam penyempurnaan biokonversi biomassa lignoselulosa menjadi produk bermanfaat. Aplikasi xilanase yang luas belum dioptimalkan karena kurang tersedianya mikroba unggul. Penelitian ini bertujuan untuk mengisolasi bakteri asal tanah hutan Taman Nasional Bukit Duabelas, Jambi dan mencirikan xilanasenya yang meliputi parameter pH optimum, suhu optimum, serta stabilitasnya. Sebanyak 28 isolat potensial telah berhasil diisolasi dari tanah hutan Taman Nasional Bukit Duabelas, Jambi dan tiga di antaranya berhasil dicirikan xilanasenya (isolat 10, 18, dan 27). Isolat 10 memproduksi xilanase ekstraseluler tertinggi pada jam ke-12 dan jam ke- 36 inkubasi kultur dengan aktivitas optimum pada pH 6 di suhu 40 oC dan 90 oC. Waktu produksi xilanase tertinggi isolat 27 tercapai pada jam ke-12 dan jam ke-30 inkubasi kultur. Kondisi optimum xilanase isolat 27 terjadi pada pH 5 di suhu 90 oC dan 50 oC, sementara xilanase isolat 18 mencapai waktu optimum produksi pada jam ke-18 dan jam ke-36 inkubasi kultur. Kondisi optimum xilanase isolat 18 tercapai pada pH 5 dan suhu 90 oC. Enzim isolat 18 memiliki waktu paruh 1 jam 7 menit pada pH dan suhu optimumnya
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Xylanolitic, Xylanase, Bukit Duabelas National Park, Jambi

Judul: Isolasi dan Pencirian Xilanase dari Bakteri Asal Tanah Hutan Taman Nasional Bukit Duabelas, Jambi, Indonesia
Abstrak: Xylanase is a xylan-degrading enzymes which are useful to improving the bioconversion of lignocellulosic biomass into useful products. Broad application of xylanase have not optimized due to the lack of superior microbes. The aim of this study is to isolate bacterial origin Bukit Duabelas National Park, Jambi and characterize its xylanase, including its pH optimum, temperature optimum, and stability. A total of 28 potential isolates have been isolated from Bukit Duabelas National Park soil, Jambi and three were successfully characterized its xilanase (isolates 10, 18, and 27). Isolate 10 reached the highest producing extracellular xylanase at 12th and 36th hours of culture incubation with optimum activity at pH 6, temperature 40 °C and 90 oC. Isolate 27 reached its highest producing extracellular xylanase at 12th and 30th hours of culture incubation. The optimum condition of xylanase isolate 27 occurred at pH 5, temperature 90 oC and 50 oC, while xylanase isolate 18 achieve its optimum production time at the 18th and 36th hours of incubation culture. Xylanase isolate 18 achieved its optimum condition at pH 5 and temperature 90 oC and has half-life time 1 hour 7 minutes.
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Judul: Implementasi Space Time Composite (STC) Data Model Menggunakan Model Data Relasional
Abstrak: The data model is a concept that describes the data stored in the database and the relationship between the data to the user in logic. Development of data models is very important in the design of the database as the basis of the stage of database design to be made. This study aims to apply the concept of Space Time Composite (STC) on the Model Data storage vector data types that can store enough information and describes the process of drafting objects and objects spatiotemporal evolution over time. From the results of the test queries on the data model that have been created, queries in a system are acquired that can help display the information preparation of objects from time to time and know the history of the object polygon and arc that has undergone changes in topology.
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