Judul: Struktur, Komposisi, Sebaran dan Potensi Jelutung Rawa (Dyera lowii.) dan Jelutung Darat (Dyera costulata.) di Tanjung Jabung Timur, Jambi.
Abstrak: The existence of Jelutung is still in question, especially in Jambi, where two species, swamp and land jelutungs are found. The aim of this study was to determine the structure, composition, distribution and potential of both jelutung species (Dyera spp.) in their natural habitat in Jambi. The study was done using the combination of line transects and square plots in 1 ha plot size located in protected peatland forests in Sungai Beras village, secondary forest in Lagan Ulu village and rubber forest plantation in Catur Rahayu village. Total of 2.219 trees, measured, there were 97 species from 68 genera and 38 families were identified in which the most dominant species were rubber, dryland jelutung, pulai, swamp jelutung and lanang tree. The Shannon-Wiener diversity index (H’) values of trees at anystage of growth were about 0-2.76, which were classified as low to mid level of diversity. Understorey plants had H’ value of about 0.49-2.76, which were classified as low to mid level of diversity. The distribution patterns of both jelutung species were in clustered and evenly. The highest potential of jelutung volume was found in Lagan Ulu with average value of 60.45 m³ha-1, followed by Catur Rahayu forests with average volume of 33.53 m³ha-1 and Sungai Beras with 27.35 m³ha-1. Conservation and future utilization of jelutung need to consider their ecological data.
Keyword: Dyera lowii, Dyera costulata, Jambi, Conservation

Judul: Struktur Tegakan dan Sebaran Jenis Jelutung dan Tumih di Hutan Rawa Gambut (Studi Kasus di Kawasan Hutan Lindung Gambut Lahai, Provinsi Kalimantan Tengah)
Abstrak: Jelutung (Dyera costulata) and Tumih (Combretocarpus rotundatus) are recognized as main tree species in peat swamp forest. This Study was aimed to determine stand structure and distribution of jelutung and tumih, and to determine the existence and growth indicator of jelutung and tumih in their natural habitat. The research was conducted in June 2010 at Lahai Peat swamp forest, Central Kalimantan Province. Stem diameter of trees 10 cm up was recorded using vegetation analysis method in sampling plots size of 100 mx 100 m which was devided into sub plot of 25 m x 25 m. the results shows that total number of trees species is 41 species in Permanent Sampling Plot (PSP) 1 and 49 species in PSP 2. However, the abundance of jelutung and tumih species is less than 12% from the tree total number growing in the Lahai peat swamp forest . Both of Jelutung and Tumih grow in the uniform pattern in which the distribution pattern of their stand structure did not follow usual form
Keyword: stand structure, species distribution, Dyera costulata, Combretocarpus rotundatus

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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