Judul: Analisis gen soluble metan monooksigenase (sMMO) bakteri metanotrof asal sawah dengan primer 534f dan 1393r
Abstrak: Bakteri metanotrof merupakan bakteri Gram negatif, bersifat aerob, dan menggunakan metan sebagai sumber karbon untuk menghasilkan energinya. Karakteristik penting dari metanotrof ini ialah memiliki enzim metan monooksigenase (MMO) yang dapat mengkatalisis metan menjadi metanol. Enzim MMO terbagi ke dalam dua tipe, yaitu particulate MMO (pMMO) dan soluble MMO (sMMO). Semua bakteri metanotrof mampu mengekspresikan enzim pMMO, namun sMMO hanya dimiliki beberapa bakteri metanotrof saja. Isolat-isolat bakteri metanotrof (BGM 1, BGM 5, BGM 9,dan SKM 14) yang berasal dari sawah Bogor dan Sukabumi, hanya isolat BGM 9 yang menunjukkan adanya aktivitas enzim sMMO dengan metode Cholorimetric Plate Assay. Fragmen amplikon dari BGM 9 diamplifikasi dan disekuensing. Sekuen yang diperoleh dianalisis dengan menggunakan perangkat bioinformatik seperti BLAST-N dan BLAST-X. Analisis sekuen amplikon menggunakan program BLAST-N dan BLAST-X berturut-turut menunjukkan kemiripan dengan sekuen pada genom Azorhizobium caulinodans ORS 571 (92%) dan gen protein S3 pada ribosom 30S Xanthobacter autotrophicus Py2 (90%). Ketidaksesuaian hasil analisis tersebut dengan gen target diduga disebabkan oleh primer yang kurang spesifik dan keterbatasan informasi database di genetik tentang mikroba dari daerah tropis.
Keyword: Bakteri metanotrof, Enzim metan monooksigenase(MMO), Soluble metan monooksigenase

Judul: Karakterisasi Gen Particulate Methane Monooxygenase (pMMO) Bakteri Metanotrof Asal Sawah
Abstrak: Metanotrophic bacteria are a methane oxidizing bacteria that have specific enzyme called methane monooxygenase (MMO). Application of metanotrophic bacteria can reduce emission of methane in rice fields. There are two types of MMO enzymes, i.e. soluble MMO (sMMO) and particulate MMO (pMMO). The pMMO enzyme is a membrane-bound enzyme that is present in all metanotrophic bacteria. BGM 1 and SKM 14 isolates showed a different colony morphology when grown on Nitrate Mineral Salt (NMS) medium + 1% methanol. The pMMO gene amplification using A189f and A682r primer showed a ~300 bp and ~500 bp of DNA band for BGM 1 and SKM 14 isolates respectively. The sequences were analyzed using BLAST-N and BLAST-X program. Analysis of amplicon sequence from BGM 1 using BLAST-N and BLAST-X program showed highest similarity with sequence of gene (87%) and amino acid in protein (71%) acyl-coA dehydrogenase Xanthobacter autotrophicus Py2 respectively. Whereas analysis of amplicon sequence from SKM 14 using BLAST-N and BLAST-X program showed highest similarity with sequence of gene (84%) and amino acid in protein (62%) subunit B cytochrome bc1 Sinorhizobium fredii HH103 respectively.
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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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