Judul: Pengaruh sumber dan takaran kalium terhadap pertumbuhan dan produksi bahan kering tanaman jagung dan kedelai pada gambut pedalaman Berengbengkel Kalimantan Tengah
Abstrak: Tanah gambut adalah jenis tanah kedua yang terluas di Indonesia. Gambut dapat dibedakan dalam (1) gambut pantai dan (2) gambut pedalaman. Gambut pedalaman di Kalimantan dan Sumatera mempunyai potensi luas hampir 9 kali lebih besar daripada gambut pantai. Akan tetapi pada umumnya gambut pedalaman tidak mampu menunjang pertumbuhan yang normal, karena produktivitas yang rendah. Rendahnya produktivitas tanah tersebut erat berkaitan dengan kemasaman tanah yang tinggi dan kejenuhan basa sangat rendah. Kondisi demikian tidak menunjang terciptanya lingkungan tumbuh, laju dan kemudahan penyediaan hara yang memadai kebutuhan tanaman. Tanaman jagung dan kedelai yang merupakan tanaman pangan penting di Indonesia, membutuhkan kondisi tanah yang memadai kebutuhan mereka. Oleh karena itu pada gambut pedalaman pertumbuhan tanaman pada umumnya menderita, bahkan gagal berproduksi. Pemberian kalsium dari berbagai sumber untuk memproduktifkan gambut pedalaman belum banyak diteliti di Indonesia.
Keyword: Calcium;, Peat soils;

Judul: Pengaruh pencampuran tanah mineral dan basa dengan tanah gambut pedalaman Kalimantan Tengah dalam budidaya tanaman kedelai
Abstrak: Gambut pedalaman umumnya bereaksi masam sampai sangat masam dengan kapasitas tukar kation (KTK) sangat tinggi, tetapi kejenuhan basa (KB) sangat rendah. Kondisi demikian tidak menunjang terciptanya laju dan kemudahan penyediaan hara yang memadai kebutuhan tanaman, terutama basa-basa seperti K, Mg dan Ca. Dalam suasana kaya bahan organik, ketersediaan hara mikro, terutama Cu juga sangat rendah.
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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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