Judul: Dampak Kebakaran Hutan Terbadap Sifat Fisik Tanah di Areal Hutan Alam Bekas Tebangan Dusun Aro, Jambi.
Abstrak: Pengelolaan sumberdaya alam tidak pernah lepas dari berbagai gangguan, baik yang ditimbulkan oleh alam maupun manusia. Masalah penyelamatan hutan dasawarsa terakhir ini telah menjadi salah satu masaIah pokok dunia. Berbagai bentuk kekhawatiran muiai meianda kehidupan manllsia, setelah menyadari adanya. penurunan daya dukung lingkungan hidup secara cepat serta berbagai bencana alam diduga sebagai akibat kerusakan hutan secara luas. Salah satu bentuk gangguan hutan yang dapat menyebabkan rusaknya hutan adalah kebakaran hutan.
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Judul: Dampak kebakaran hutan terhadap tumbuhan bawah dan sifat kimia tanah di hutan pendidikan Gunung Walat-Sukabumi
Abstrak: Hak cipta Kebakaran hutan dan lahan saat ini dipandang telah menjadi salah satu bentuk gangguan terhadap pengelolaan hutan dan lahan. Akibat negatif yang ditimbulkan cukup besar misalnya kerusakan ekologis, menurunnya estetika, merosotnya nilai ekonomi hutan dan produktivitas tanah, perubahan iklim mikro maupun global, menurunkan keanekaragaman sumberdaya alam hayati dan ekosistemnya. Penelitian ini bertujuan untuk menilai dampak terjadinya kebakaran hutan terhadap tumbuhan bawah dan perubahan kandungan sifat kimia tanah periode 3 tahun setelah terbakar. Diharapkan dapat diperoleh informasi tentang perkembangan pemulihan kondisi ekosistem hutan dilihat dari perkembangan tumbuhan bawah dan perubahan kondisi kandungan kimia tanah yang akan berpengaruh terhadap perubahan tingkat kesuburan tanah di areal tersebut setelah terjadi kebakaran hutan...
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Judul: Pemurnian dan karakterisasi protein inhibitor RNA helikase virus hepatitis C
Abstrak: Hepatitis C virus (HCV) infection is the second most common chronic viral infection in the world with global prevalence. This infection is contribution to chronic hepatitis and liver cirrhosis, often leading to hepatocellular carcinoma. There is no effective drug and vaccine available against HCV. The current standard treatment, a combination of pegylated interferon-α with ribavirin, is limited by its suboptimal response rate in a significant patient population, side effects, and affordability. Therefore, development of effective drug is needed. One approach to find out the candidate of antiviral drug is to discover the inhibitor of enzyme that essential for virus replication, such as RNA helicase. Streptomyces chartreusis 5-095 produce the inhibitor of HCV RNA helicase. The aim of this study was to purify the protein inhibitor which has inhibition activity against ATPase activity of RNA helicase HCV from S. chartreusis 5-095. The supernatant of culture S. chartreusis 5-095 exhibited high inhibiton activity against ATPase activity of RNA helicase HCV (approximately 72%) at 10 days of incubation. The extracellular protein inhibitor was partially purified by procedures of precipitation with ammonium sulfate to 65% saturation and gel filtration (Sephadex G50) using methanol water solution (4:6) as an eluen. The purity of protein inhibitor was monitored by SDS PAGE. The protein inhibitor showed a relative molecular mass were estimated to be 14 kDa and increased the purity 23,08 fold than those of the crude protein. The specific activity and IC50 after purification were 13,1338 U/mg and 0,0767 mg/mL, respectively. The activity of purified protein inhibitor showed its stability over pH range from 5-8 and optimum at pH 7,4. The inhibition activity showed its stability up to 70% at temperature 100 oC. The purified protein inhibitor relatively stable its activity at storage in the range of -20 oC to room temperature for 35 days.
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