Judul: Pengaruh Media Pertumbuhan terhadap Potensi Antibakteri dan Antihiperglikemik Kapang Endofit Tumbuhan Pesisir Sarang Semut Hydnophytum formicarum
Abstrak: Sarang semut plant is traditionally used for medical purposes. The aim of this research was to observe the antibacterial and α-glucosidase enzyme inhibitor activities of the fungal extracts isolated from sarang semut plant which was cultivated in different culture media. The fungus cultivated using PDB medium grew faster in comparison with one in Hagem medium. During 21 days of cultivation, pH value was 4-5. The best results of antibacterial activity against Escherichia coli and Staphylococcus aureus were extract of culture medium with PDB treatment in 18 days cultivation, with inhibitor zone was 17.6 mm and 16.5 mm, respectively. IC50 value for α-glucosidase inhibitor was 9345.777 ppm showed by extract of culture in Hagem medium.
Keyword: Bogor Agricultural University (IPB), Hydnophytum formicarum., endophytic fungi, biomass, antihyperglycemic, antibacterial

Judul: Kapang Endofit dari Tumbuhan Pesisir Sarang Semut (Hydnophytum formicarum) dan Potensinya sebagai Antihiperglikemik
Abstrak: Epiphytic plant sarang semut Hydnophytum formicarum is one of the coastal plants that used as traditional medicine. Microbial endophytic can produce secondary metabolite compounds similar to compounds produced by plants of its host. The purpose of this research was to determine the activity of the endophytic fungi extracts to inhibit α-glucosidase. This research included isolation, cultivation, extraction, characterization, and assay the antihyperglycemic activity. The results showed 7 types of endophytic isolates included 1A, 1B, 2A, 2B, 3, 6A and 6B with a different characterization. Endophytic fungus 3 and 6B were the selected isolate based on antagonism test. A fungal growth patterns showed that the stationary phase of the fungus was on the 21th day until 24th day. Phytochemical test on extracts of mycelium and culture media showed that the extracts containing flavonoids and phenols hydroquinone. The screening results showed that the fungal broth extract with concentration of 20000 ppm had α-glucosidase inhibitor activity 72.63%.
Keyword: α-glucosidase enzyme activity, sarang semut, endophytic fungi, antihyperglycemic

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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