Judul: Forest vegetation composition and structure of the former forest burned area (In R. Soerjo Forest Park Area, Malang)
Abstrak: I NTRODUCTION. Forests damage in Indonesia are increasing affect to forest function decline. One cause of forest destruction in Indonesia is forest fires. Forest fires in Indonesia are mostly caused by humans. Impact of forest fires covering all aspects of ecosystems like, vegetation, fauna, soil, water, climate, air, and humans. forest vegetation damage caused succession in burned area. Succession effect reflected on forest vegetation composition dan structure. METHODOLOGY. The research was conducted in unburnt forest area, forest areas with a mild fire level, forest area with medium fire level, and forest area with heavy fire level. In each site observations made in three plots with plot size 100 x 100 m. In each plot observations are made of 4 sub-plots sample with size 20 x 20 m to measure the level of tree, strangler and woody liana; size 10 x 10 m to measure the level of the pole; size 5 x 5 m measure the level of saplings, lianas non-wood, pine, and palm; and 2 x 2 m measure the level of seedlings, ferns, shrubs and herbs. RESULTS AND CONCLUSION. Forest fires in R Soerjo Forest Park, Malang resulted in a decrease number of species of trees and regeneration rate and growth form. Only herb that has a stable species number in all forest conditions. Shannon species diversity according to the Index of General Diversity (H') shows that forest fires reduced the value of diversity at the level of stakes, poles, trees and most other forms of non-tree growth. Forest structure in each forest condition have a different highest diameter class. Unburned forest conditions have diameter until up to 110 cm, mild level forest fires reached only 60-69 cm for the highest diameter class. Meanwhile, on the medium level forest fires reached 80-89 cm for the highest diameter class, while the diameter classes of forest with heavy fire levels only reached 40-49 cm. Forest fires reduce the value of density on all forest burned area. The effect of forest fire on soil chemical properties are decrease soil pH value, increase the value of C-organic, and increase the value of cation exchange capacity (CEC). Forest fire in R. Soerjo Forest Park Area, Malang is causing changes of forest vegetation composition and structure and also soil chemical properties.
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Judul: Komposisi dan Struktur Vegetasi pada Hutan Lindung Pasca Kebakaran di Rasau Jaya, Kubu Raya, Kalimantan Barat
Abstrak: Perubahan yang terjadi pada komposisi dan struktur vegetasi dapat menggambarkan dampak kebakaran hutan yang kerap kali terjadi dan mengakibatkan menurunnya fungsi hutan. Tujuan penelitian ini adalah untuk menganalisis perubahan komposisi dan struktur vegetasi di Hutan Lindung (HL) Pinang Luar pasca kebakaran dan Hutan Lindung (HL) Sungai Ambawang kecil yang tidak terbakar di Kubu Raya, Kalimantan Barat. Metode yang digunakan adalah metode jalur berpetak dengan pola penarikan contoh nested sampling dengan membuat 45 petak pengamatan yang berukuran 20 x 20 meter. Identifikasi spesies dan analisis data mencakup indeks nilai penting (INP), indeks kesamaan komunitas (IS), indeks dominansi (C), indeks keragaman jenis (H'), dan analisis tanah rutin. Jumlah spesies yang ditemukan pada HL Pinang Luar adalah 8 spesies yang didominasi oleh jenis paku-pakuan dan 36 spesies yang didominasi oleh berbagai jenis vegetasi pada HL Sungai Ambawang Kecil. Nilai IS dari dua blok HL Pinang Luar yang dibandingkan adalah 100%, sedangkan nilai IS pada HL Pinang Luar dan HL Sungai Ambawang Kecil yang dibandingkan tergolong rendah. Nilai H' tertinggi pada HL Pinang Luar adalah 1,211 dari jenis paku-pakuan sedangkan HL Sungai Ambawang kecil memiliki nilai H' 2,474 dari berbagai jenis vegetasi tingkat pancang. Kata kunci : Analisis vegetasi, dominansi, keragaman, lahan gambut, nilai penting, Changes that occur in the composition and structure of vegetation can illustrate the impact of forest fires that often occur and cause a forest function to decline. The purpose of this study is to analyze changes in the composition and structure of vegetation in the Pinang Luar Protection Forest (HL) that has been burned and the Sungai Ambawang Kecil Protection Forest (HL) that is not burned in Kubu Raya, West Kalimantan. The method used is the plot method with nested sampling pattern by making 45 observation plots measuring 20 x 20 meters. Species identification and data analysis included important value index (INP), community similarity index (IS), dominance index (C), species diversity index (H'), and routine soil index. The number of species found in the HL Pinang Luar is 8 species which are dominated by ferns and 36 species which are dominated by various vegetation types in the HL Sungai Ambawang Kecil. The IS value of the two blocks in the HL Pinang Luar which is compared is 100%, while the IS value of the HL Pinang Luar and HL Sungai Ambawang Kecil which is compared is below 50%. while the highest H' value in the HL Pinang Luar is 1,211 from ferns. The HL Sungai Ambawang Kecil has an H' value 2,474 from various types of sapling vegetation. Keywords: Diversity, dominance, important value, peatland, vegetation analysis
Keyword: Analisis vegetasi, dominansi, keragaman, lahan gambut, nilai penting

Judul: Optimization of Alginate-Chitosan Microcapsules Formation for Leydig Cells Encapsulation
Abstrak: Hypogonadism is a clinical condition characterized by low concentrations of testosterone. It is caused by malfunction of Leydig cells in producing testosterone. Encapsulation method will protect the transplanted cells from the immune system rejection. The aims of this study was to optimize the formation of microcapsules for Leydig cells encapsulation. The microcapsules were made of alginate and chitosan as the first and the second coating agents, respectively. The result showed that the minimum concentration of alginate was 1.5% (w/v) with a viscosity of 33.8 cPs, resulted spherical microcapsules with diameters of 230-270 µm. The optimum concentration of chitosan as the second coating agent was 0.5% (w/v), resulted spherical microcapsule with mechanical stability in 4 hours. Leydig cells can be trapped inside the capsule with a density that proportional with concentration of cells used in the encapsulation.
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