Judul: Respon Sel Leydig Dari Mencit Neonatal Terhadap Hcg Selama Kultur In Vitro.
Abstrak: Sel Leydig merupakan sel penghasil hormon testosteron pada hewan jantan. Berdasarkan tingkat kematangan, populasinya terbagi menjadi sel Leydig fetal dan sel Leydig dewasa. Hormon human chorionic gonadotropin (hCG) adalah salah satu faktor yang memengaruhi proliferasi dan diferensiasi pada sel Leydig dewasa, tetapi belum diketahui pengaruhnya pada sel Leydig fetal. Penelitian ini bertujuan untuk menjajaki respon sel Leydig fetal terhadap penambahan hCG pada kultur in vitro dengan menggunakan sel Leydig yang diisolasi dari mencit neonatal. Sel Leydig diisolasi dari mencit neonatal umur tiga hari, dikultur in vitro selama enam hari, dan diberi perlakuan dengan dan tanpa penambahan hCG. Data yang dievaluasi berupa tingkat proliferasi (population doubling time, PDT) dan jumlah sel yang mengekspresikan keberadaan enzim 3β-HSD. Hasil penelitian menunjukkan bahwa penambahan hCG pada kultur in vitro sel Leydig dewasa meningkatkan proliferasi sel, sebaliknya pada sel Leydig fetal menurunkan proliferasi sel. Penambahan hCG tidak memengaruhi persentase jumlah sel Leydig dari mencit neonatal yang mengekspresikan enzim 3β-HSD. Dapat disimpulkan bahwa sel Leydig fetal dari mencit neonatal memiliki respon yang berbeda dengan sel Leydig dewasa terhadap penambahan hCG secara in vitro.
Keyword: hCG, kultur in vitro, mencit neonatal, proliferasi, sel Leydig

Judul: IPB (Bogor Agricultural University)
Abstrak: The use of Percoll gradients for Leydig cells isolation has been reported to influence cell toxicity and reduce the viability and the amount of living cells after culture. To dissolve this problem, study has been carried out used non toxic Nycodenz gradient to isolated and purified the Leydig cells. The use of Nycodenz gradient for the isolation and purification of Leydig cells has not been done by other researchers. To obtain the optimum condition of Leydig cells production, growth factor is required as supporting factors for development of growing cells. Therefore, hCG and ITS has been used in this study. Leydig cells conditioned medium (LCM) contained bioactive materials such as testosterone and growth factors. The Leydig cells conditioned medium as culture medium for bone marrow mesenchymal stem cells will be used to determine its influence to differentiation of cells. The phase of this study included: 1. Isolation and purification of Leydig cells using Nycodenz gradient : (I) with 3 column ( 5 % , 10 % , 15 % ) and ( II ) with 5 columns ( 4 % , 8 % , 10 % , 12 % , 15 % ) and Percoll gradient ( 21 % , 26 % , 34 % , 40 % , 60 % ) as a control . 2. In vitro culture of the best result from cell purification was cultured with the addition of hormones and growth factors : (1) DMEM+NBCS 10% as control, (2) DMEM + NBCS + 2.5 IU/ml hCG , (3) DMEM + NBCS+ 5 ug / ml insulin, 10 ug/ml transferrin, selenium 5 ug/ml (ITS ) and (4) DMEM +NBCS + hCG+ITS . 3 . The concentration of testosteron and protein analyzed from Leydig cells conditioned medium has been used for culturing bone marrow mesenchymal stem cells. The result of first phase study was Nycodenz gradient have the same purity and viability compared with Percoll gradient. After 3 days cultured, in Nycodenz gradient the concentration and viability of Leydig cells more higher than Percoll gradient. The combination of hCG and ITS in DMEM produced Leydig cell proliferation (90.64%) higher compared with hCG (86.99%), ITS (88.35%) and control (86.82%). Proliferation rate (population doubling time, PDT) from primary culture using combination of hCG and ITS showed the fastest (0.88 day) compared with ITS (0.97 day), hCG (1.02 day) and control (1.03 day). The same result of Leydig cells proliferation rate has also showed in first and second cell lines. Testosterone consentration analyzed was the highest (5.25 ng/ml) in DMEM combination with hCG and ITS compared with other treatments (hCG 5.06 ng/ml; ITS 3.19 ng/ml and control 2.46 ng/ml). Differentiation to became Leydig cells from bone marrow mesenchymal stem cells has been known from positive reaction to 3β-HSD staining. Added of hCG to Leydig cells conditioned medium was able to increased the number of Leydig cells to 71.9%. It was also showed that concentration of testosterone has been increased (0.93 ng/ml and 10.22 ng/ml) in the culture medium. The combination of hCG and ITS in DMEM had testosterone (0.71 ng/ml) and protein
Keyword: Leydig cells, rat, Nycodenz, testosterone, mesenchymal stem cells, bone marrow, conditioned medium, transdiferentiation

Judul: Strategi Pengendalian Kebakaran Hutan dan Lahan di Taman Nasional Rawa Aopa Watumohai dengan Pemanfaatan Pemodelan Spasial.
Abstrak: Rawa Aopa Watumohai National Park (TNRAW) is one of the most important conservation areas in Indonesia which has unique species in Wallacea region, and an international status as a RAMSAR Site. Unfortunately, TNRAW has been disturbed by wildfire that could potentially degrade functions. The objectives of this study were (1) to analyze the appropriate factors that influenced the vulnerability of forest fires in TNRAW and the surrounding areas, (2) to optimize forest fires management in TNRAW through early warning and spatial modeling, (3) to formulate strategic direction to control forest fires in TNRAW. This research used the CMA (Composite Mapping Analysis) method. Based on the analysis of the 13 variables associated fuels and ignitions, it was formed 9 variables that built the hotspots density model in the study area, they were the average monthly temperature, elevation, slope, level of income, population density, land cover, the buffers of rivers, the buffers of mangrove / marine and the buffers of district centers. The factors influenced spatially vulnerability of the forest fires in the study area were socio-economic (regional income) and land cover. On the other hand, the rainfall intensity influenced temporally frequency of wildfires. Best composite model had a determination coefficient of 25.8 % and formed a polynomial model. Three classes of fires vulnerability grouped by Arc GIS 9.3 based on summary mean and standard deviation, ie low vulnerability 815.32 km² (77.51 %), middle class 92.74 km² (8.8 %) and high vulnerability 137.14 km² (13.04 %). The widest class of high vulnerability was the buffer zone of 104.86 km² (9.97 %), and the core zone just only 2.1 km² (0.2 %). According to the spatial model, the effective forest fires management needed to consider socio-economic and land cover. The priority of the forest fires management needed to be focused at the core zone and the buffer zone from the foot of Watumohai Mountains to savanna near mangrove which high vulnerability for wildfires. The chosen strategy based on Quantitative Strategic Planning Matrix (QSPM) method by score of 5.87 was the threats analysis and diversification of forest fire control method, devided into preventif and repressive methods, such as socialization, promotion, infrastructure development, law enforcement and fire suppression.
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