Judul: Dampak Kebakaran Hutan Terhadap Sifat Fisika Tanah di Hutan Tanaman Sekunder Akasia (Acacia mangium) di Desa Langensari Kecamatan Parung Kuda Sukabumi, Jawa Barat
Abstrak: Kebakaran hutan menyebabkan dampak negatif terhadap tanah berupa penurunan kualitas lahan, meliputi sifat fisika, kimia, biologi tanah, erosi, kapasitas pcnyimpanan air tanah, penghilangan serasah serta humus, seluruhnya akan berpengaruh terhadap pertumbuhan pohon selanjutnya di areal tersebut. Dampak kebakaran hutan terhadap sifat fisika dan kimia tanah tergantung dari tipe tanah, kandungan air tanah, intensitas dan durasi waktu kebakaran, lama waktu dan intensitas timbulnya api.
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Judul: dampak Kebakaran Hutan Terhadap Sifat Fisik dan Sifat Kimia Tanah (Studi Kasusdi Hutan Sekunder Haurbentes Jasinga-Bogor)
Abstrak: Kebakaran hutan merupakan salah satu perisliwa alam yang dapal menyebabkan kerusakan dan musnahnya hutan dalam waktu yang sangal cepat. Rusaknya hutan ini melipuli hilangnya keanekaragaman tumbuhan dan satwa serta musnahnya plasma nutfah. Kebakaran hutan yang menimbulkan kerusakan ekosistem dunia sampai sekarang ini belum dapat ditanggulangi secara maksimal. Dampak kebakaran hulan dapat merugikan kehidupan manusia. Sedangkan beberapa keuntungan dari kebakaran hutan adalah memperoleh tunas atau rumpul muda untuk lemak serta untuk mengurangi timbunan bahan bakar di lantai hulan sehingga lahan hulan siap ditanami. Adapun dampak negatif kebakaran hulan terhadap tanah adalah penurunan kualitas lahan hulan yang meliputi sifat fisik dan kimia tanah, erosi, kapasitas penyimpanan air tanah dan penghilangan serasah serta humus, yang seluruhnya sangat mempengaruhi pertumbuhan pohon.
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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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