Judul: Komposisi Functional Species Group pada Sistem Silvikultur Tebang Pilih Tanam Jalur di Area IUPHHK-HA PT Sarpatim, Kalimantan Tengah
Abstrak: Forest management can have an impact on changes in forest structure and composition of plant species. Functional species Group (FSG) may explain the unity of the trees species that are selected in a group in a forest management activities so that it can help in explaining the characteristic of biodiversity such as the quality of habitat and ecosystem processes. The purpose of this research is to know the composition of forest vegetation that the production system are managed with a Silvikultur system of TPTJ as seen from the forest structure and composition of the type that belongs to FSG for the stands and natural regeneration in log over area (LOA) and KPPN (The Conservation of Germplasm Area) IUPHHK-HA PT Sarmiento Parakantja Timber (Sarpatim), Central Kalimantan. Analysis of the composition of the stands type and structure used terraced path in the area of TPTJ and KPPN. The results showed that the types of climax on an entire swath of observations, generally have greater proportion than the group of pioneers, the number of the climax type is 100 while pioneer type is 59. The structure of the stands form a J reverse curve, it show that the composition of vegetation recovery on log over areas managed by using TPTJ and KPPN Silvikultur system has balance characteristic of uneven age forest. The value of diversity is high (H'>3). Most of tree and stands community have different communities (ID>50%).
Keyword: Bogor Agricultural University (IPB), composition of species, Forest management, Silviculture system

Judul: Kajian Aspek Vegetasi dalam Penerapan TPTI Intensif di IUPHHK/HA PT. Sarmiento Parakantja Timber, Kalimantan Tengah
Abstrak: system for present and future generations. Therefore, Indonesian Ministry of Forestry has appointed several IUPHHK/HA to serve as model for development of intensive silvicultural system for natural forest. However, this silvicultural system had negative impacts due to its exploitation activities which created considerable changes on forest ecosystem, which are mostly in the form of damage on soil and forest vegetation. Therefore there is a need for activity to evaluate the environmental condition, either in terms of composition or structure of the residual stand. The objectives of this research were learning the structure and composition of the forest stand in TPTII 2 research compartment, and comparing the results with those in TPTI 3 research compartment. Methodology. Data collection for this research was conducted in the area of PT Sarpatim, Central Kalimantan from March to April 2008. The equipments used were phi band, suunto clinometer, compass, raffia rope, staking pegs, tally sheets, writing materials, software Microsoft Excel 2003, and camera. Data were obtained through vegetation analysis with transect method. The research was conducted in 7 locations, namely in germ plasms measurement plots, TPTI 2006, TPTI 2007, TPTII 2005, TPTII 2006, TPTII 2007, and land preparation area or TPTII 2008. Each measurement plot measured 100 m x 100 m which was directed to the north with two observation strips in its two sides, measuring 100 m x 20 m. Analysis of the research data was performed with the following information: density values of healthy commercial trees, IVI, species diversity indexes, coefficient of community similarity, and stand structure. Results and Discussion. Species which dominated each research compartment varied in all growth stages. Value of species diversity in germ plasms plot was categorized as high. The lowest similarity of vegetation community was 21.87 % at pole growth stage, between research compartment of TPTI 2007 and TPTII 2008; whereas that of the highest was between TPTII 2006 and TPTII 2007, namely as much as 67.86 %. Stand structure in TPTII 2008 research compartment possessed the largest density value for surprisingly the trees with diameter class of 60 cm upward, namely 53 trees/hectare. Conclusion. Density of healthy commercial trees in the forests of germplasm, TPTI, or TPTII fulfilled the minimum requirement from TPTI guidelines. System of selective cutting created positive impacts on regeneration at sapling stage. The most dominant species was ubar. Coeficient of communited similarity on the forests of germ plasms, TPTI, and TPTII has low value, so far from 100 %. In TPTI 2006 and TPTII 2007 the structure of forest stand had inverted “J” shape.
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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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