Judul: Pembuatan Bibit serta Analisis Ikatan Molekul Miselium Jamur Tiram Putih dengan Fourier Transform Infra Red (FTIR)
Abstrak: Pleurotus Ostreatus is a kind of oyster mushrooms which consumed by the public . This oyster mushrooms contain high nutritional but has a high level in the sterilization when manufacture of seed. Making seeds through several stages , they are the manufacture of pure cultures , spread seeds , and planting seeds . In this study, variations in the manufacturing stages of PDA ( Potato DextrossAgar) for the variation of the old pure cultures of material boiling for 5 minutes , 10 minutes , and 15 minutes and level of sterilization media use variety of steaming tiers 1 , 2 and 3 , which each level of steamed for 1 hour with a temperature of 120 °C and the pressure of 1.5 psi . The highest success is when the variation 10 minutes and the streaming tiers 3 which the growth of mycelium in tube. Fourier Transform Infra Red (FTIR) analysis shows that the force constant of planting seeds (F2) are higher than F0 and F1. If force constant is higher so the molecule bond is stonger. It make mycelium of F2 is stronger too and it is better to be used for cultivation
Keyword: force constant, FTIR, Mycelim, Molecule bond

Judul: Analisis Gugus Fungsi Miselium Bibit Jamur Tiram Putih dari Media Sorgum Menggunakan Spektrofotometer FTIR
Abstrak: Keberhasilan pembuatan bibit jamur tiram bergantung pada media Potato Dextrose Agar (PDA). Pada penelitian ini dilakukan variasi tingkat sterilisasi media menggunakan pengukusan dengan variasi tingkat 1, 2, dan 3 dengan masing-masing tingkat dikukus selama 60 menit dengan suhu 102 °C. Hasil terbaik diperoleh pada sterilisasi tingkat 3. Hal ini ditunjukkan dengan penumbuhan miselium yang memenuhi tabung. Pada pembuatan bibit sebar (F1) dengan media sorgum, hasil yang didapat tidak ada yang terkontaminasi. Hasil karakterisasi FTIR menunjukkan adanya vibrasi regangan pada miselium untuk biakan murni, bibit sebar, dan bibit tanam. Vibrasi regangan tersebut mengidentifikasikan adanya gugus fungsi C-O, C-N, C=O, C-H, O-H, dan ikatan ẞ-D-glukan.
Keyword: FTIR, Functional groups, mycelium, sorghum media, Biakan murni, Bibit sebar, Bibit tanam, Karakteristik miselium

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.
Keyword: