Judul: Komposisi Jenis dan Persamaan Matematika untuk Struktur Tegakan Horizontal Hutan Rakyat di Desa Kalimendong
Abstrak: Stand structure can be used to identify the plantation characteristic. That is important for determining treatment of silviculture. This research purpose is to find out the information of mathematic equation in every private community forest in Kalimendong Village. This research was conducted in Kalimendong Village, Wonosobo Distrct in May 2014 (2 weeks). Data was collected using census method, where the measurement was done in every stands on private lands. Processed data was confined to dominating stands which is Sengon with 519 Sengon trees. Sengon’s variables is diameter and basal area presented in histogram. In order to explain more about stands distribution, data analyzed using normal distribution function. The result showed that the mathematic equation in every private land can be accepted with coefficient of determination (R²) more than 0.5 and p-value less than 0.05. Distribution form obtained from this research is polynomial function and negative exponential. Plantation characteristic specifically known from inverted bell curve but Sutarman and Waluyo land has inverted ‘’J’’ c
Keyword: Bogor Agricultural University (IPB), stands structure, mathematic equation

Judul: Persamaan Matematika untuk Struktur Tegakan Horizontal Hutan Mangrove di Pantai Timur Kota Surabaya
Abstrak: Mangrove forest is one of the coastal ecosystems which have important roles in development and management of East Coast Surabaya so information about species and stand structure of the mangrove forest are needed. The purpose of this study is arranging mathematic equation for horizontal stand structure which describe horizontal stand structure according dominant species and stand conditions, includes undisturbed natural stand, disturbed natural stand, and unnatural stand. Data was collected from 10  10 m sample plot and selected by purposive sampling. Composing and analyzing of mathematic equation used negative exponential function N = N0e-kD. Undisturbed natural stand and unnatural stand which dominated by api-api (genus Avicennia) specieses have high density, composed by large numbers of small diameter trees, and a sharp decline number of larger diameter trees. Instead, the trees distribution of undisturbed natural stand dominated by bogem (Sonneratia caseolaris) are proportioned enough but it has less regeneration, a low density, and the ability of natural regeneration is relatively slow.
Keyword: horizontal stand structure, mangrove

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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