Judul: Struktur dan komposisi tegakan serta sistem perakaran tumbuhan pada kawasan karst di Taman Nasional Bantimurung-Bulusaraung, Resort Pattunuang-Karaenta
Abstrak: Plants in Karst Area have different characteristics and distinctive when compared with plants of other forest ecosystem. The purpose of research is to assessing the composition and stand structure and root system of plants in karst areas in Bantimurung-Bulusaraung National Park, Resort Pattunuang-Karaenta. This observation plots determined by purposive sampling based on the representation of the stand. Three sample plots lines with the size of 20 m x 100 m each were constructed in the research site. The research was spread out on four habitats that are on hill base, slopes, summit with considerable soil cover, and summit with very little soil cover. The number of species on the research area is amounted 108 species of seedlings and understorey plants, 108 species saplings, 63 species poles and 78 species trees. Horizontal structure inverted J-shaped and vertical structure of the stand consist of four strata (B, C, D, and E strata). Overall, the spatial distribution patterns have a clumped distribution pattern. Uniform distribution pattern is only found in Palaquium obovatum species of pole on slopes and Dracontomelon dao species of tree on base. Pterospermum celebicum has the highest value of shoot-root ratio on the hill base, index root binding highest value with category of moderate (1.5-3.5) on hill base and index root anchoring highest value with the high category (>1.0) on summits with considerable soil cover.
Keyword: Bogor Agricultural University (IPB), stand structure, root system, stand composition

Judul: Komposisi jenis dan struktur tegakan hutan di areal IUPHHK-HA PT Bina Ovivipari Semesta, Kalimantan Barat
Abstrak: Ekosistem mangrove memiliki peran penting dalam menjaga keseimbangan alam di kawasan pesisir sampai daratan. Salah satu pemegang konsesi hutan alam mangrove di Kabupaten Kubu Raya, Kalimantan Barat adalah PT. Bina Ovivipari Semesta (BIOS). Metode yang digunakan yaitu metode jalur transek dengan penentuan jalur menggunakan cara purposive sampling. Komposisi jenis pohon di hutan mangrove sebelum tebangan terdiri dari enam yaitu jenis Bruguiera gymnorhiza, Excoecaria agallocha, Rhizophora apiculata, R. mucronata, dan Xylocarpus granatum. Pada hutan bekas tebangan tahun 2006 terdapat empat jenis yaitu B. gymnorhiza, R. apiculata, X. granatum dan E. agallocha, hutan bekas tebangan tahun 2009 terdapat lima jenis yaitu B.gymnorhiza, R. apiculata, X. granatum, Candelia candel, dan Ceriops roxburgiana. Pada hutan bekas tebangan tahun 2012 terdapat dua jenis yaitu B. gymnorhiza dan R. apiculata. Struktur tegakan yang ada di PT. BIOS sebelum tebangan tidak menunjukkan huruf “J” terbalik sedangkan pada tegakan bekas tebangan berbentuk huruf “J” terbalik yang artinya hutan masih tergolong normal.
Keyword: mangrove ecosystem, species composition,, standing structure

Judul: Pemodelan Dinamika Glukosa dengan Persamaan Hovorka menggunakan Metode ODE 45 untuk Kasus Diabetes Tipe 1.
Abstrak: Type 1 Diabetes is a case where beta cell in pancreas cannot produce insulin properly. On a type 1 diabetes case, some insulin had to be added into the bloodstream. This simulation used Hovorka equations and ODE 45 methods in MATLAB. To know the amount of dosage for insulin that a type 1 diabetes case need, also how the kinematics and dynamics look like for the glucose rate in the bloodstream can be done by using this simulation. Some variation on the amount of insulin, injection time and weight had been done to get the optimum result of glucose rate in the bloodstream. The result from this simulation is a 70 kg weigh need insulin injection in the morning for about 2 dL, and 21 dL each for afternoon and night times, all of injection time is an hour after eating.
Keyword: ODE 45, Hovorka method, Insulin, Type 1 Diabetes, Blood glucose