Judul: Analisis Variabilitas Iklim dan Kejadian Kebakaran Hutan dan Lahan di Kabupaten Bengkalis, Provinsi Riau
Abstrak: Kebakaran hutan di Indonesia merupakan salah satu masalah lingkungan serius yang sampai saat ini masih belum dapat diatasi dengan baik. Provinsi Riau merupakan daerah rawan kebakaran hutan dan lahan yang didominasi oleh kebakaran di lahan gambut. Pada tahun 2015, Provinsi Riau termasuk salah satu provinsi yang mengalami kebakaran hutan dan lahan yang luas. Tujuan dari penelitian ini adalah menganalisis pola unsur iklim, distribusi titik panas, dan korelasi antara unsur iklim dan titik panas (hotspot) sebagai indikator kejadian kebakaran hutan dan lahan di Kabupaten Bengkalis, Provinsi Riau. Hasil penelitian menunjukkan bahwa Kabupaten Bengkalis mempunyai dua periode musim kemarau, yaitu pada bulan Februari-Maret dan Juli-September, serta memiliki puncak curah hujan tertinggi pada bulan Maret-Mei dan Oktober- Desember. Jumlah titik panas tertinggi di Kabupaten Bengkalis terjadi pada tahun 2015 dibandingkan dengan tahun 2016 dan 2017, yang dipengaruhi oleh fenomena El Nino. Curah hujan, suhu udara rata-rata, dan suhu udara maksimum berpengaruh nyata (p-value<0.05) terhadap distribusi titik panas.
Keyword: El Nino, Riau, titik panas, unsur iklim

Judul: Variabilitas Iklim dan Kejadian Kebakaran Hutan dan Lahan Gambut di Kabupaten Bengkalis, Provinsi Riau.
Abstrak: Bengkalis is one of districts which is vulnerable to forest and peatland fires in Riau due to land use change. This research aims to compare the observation climate data of Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG) and global climate data from Climatic Research Unit (CRU) satellite as factors that affect the incidence of forest and peatland fires, analyze the distribution of forest and peatland fires in Bengkalis, and analyze the correlation between the elements climate (rainfall, maximum air temperature, and average air temperature) of CRU satellite and hotspot as an indicator of forest and peatland fires in Bengkalis. The result of the research revealed that climate patterns of CRU satellite in line with climate patterns of BMKG observations.. Spatial distribution of hotspots, 1998, 2002, 2004, 2005, 2006, and 2009 had the highest number of hotspots. Most hotspots are in the peat soil types Hemists/Saprists (60/40), very deep and on land cover shrub swamp. The maximum air temperature and average air temperature significant (p-value <0.05) to the number of hotspots while the rainfall did not significantly affect the number of hotspots. The best model also showed the absence of a suitable model to describe the relationship between elements of the climate and the number of hotspots.
Keyword: Climatic Research Unit, hotspot, climate, peat fires

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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