Judul: Pelacakan Gen Serupa hemA dan hemT Pada Sejumlah Isolat Bakteri Fotosintetik Anoksigenik dan Beberapa Contoh Tanah dari Indonesia
Abstrak: Gen hemA dan hemT adalah gen penyandi isozim asarn 6- arninolevulinat (ALA)-sintase pada Rhodobacter sphaeroides 2.4.1. Gen tersebut rnerupakan bahan genetik penting dalam usaha peningkatan produksi ALA rnelalui rekayasa genetik, karena ALA-sintase rnerupakan enzim kunci dalarn biosintesis ALA rnelalui lintasan C,. Penelitian ini bertujuan untuk rnelacak gen serupa hemA dan hemT dari 20 isolat bakteri fotosintetik anoksigenik (BFA) dan empat contoh tanah dari daerah Bogor. Pelacakan dilakukan dengan teknik hibridisasi Southern dan hibridisasi Dot Blot. Teknik hibridisasi Southern digunakan untuk rnelacak gen serupa hemA dan hemT pada 20 isolat BFA sedangkan hibridisasi Dot Blot digunakan untuk rnelacak kedua gen tersebut pada contoh tanah. Pelacak yang digunakan adalah fragrnen gen hemA dan hemT.
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Judul: Analisis keragaman genetik dan sintasan sejumlah isolat bekteri fotosintetik anoksigenik asal laut
Abstrak: Eighty isolates of anoxygenic photosynthetic bacte- ria were isolated from 49 samples collected from a number of Indonesian seashores. All of the isolates showed similar color (i.e. photosynthetically in red to brownish red) when grown Sea Water Complete (SWC) medium. under illumination of tungsten light (± 200 lux). Many of the isolates were gram-negative, rod shape bacteria. However, genetic analysis employing Asel-schizotyping of 45 selected isolates indicated extensive genetic diversi- ty which apparently did not show any biogeographic relat- edness. A number their survival of selected isolates in sterile sea water were examined for supplemented with peptone (0,1 g/1) and yeast extract (0,02 g/1). All of the isolates demonstrated significant growth until 5 days of incubation and most of them maintained their viability up to 7 days of incubation. However, SKX121 is the only isolate which could maintain its viability up to 2 x 109 cell/ml after 7 days of incubation. From 47 isolates examined, 35 isolates were signifi- cantly more tolerant to Na2S (up to 100 µg/ml than isolate MW4, a reference isolate which has been known as sulphide tolerant anoxygenic photosynthetic bacteria.
Keyword: keragaman genetik, Bakteri fotosintetik, laut

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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