Judul: Karakterisasi Fisiologis Heterokis-Cyanobacteria Asal Wilayah Adat Kasepuhan Taman Nasional Gunung Halimun Salak Jawa Barat
Abstrak: There are two groups of filamentous cyanobacteria which is characterized by the presence and absence of heterocyst. Anabaena, Nostoc, Aphanizomenon, Calothrix, Scytonema, Tolypothrix, and Stigonema are examples of species heterocystous cyanobacteria species. Indonesia has a rich cyanobacteria diversity, however the knowledge about microalgae is poorly known. The data on the physiological characteristics diversity of heterocystous cyanobacteria from Kasepuhan Area West Java are an important information of the Indonesian heterocystous cyanobacteria. The objectives of this study were 35 days observation of the a chlorophyll and protein content of heterocystous cyanobacteria using experimental descriptive analysis. The 􀄮 chlorophyll content was analyzed using spectophotometric method and counted by Arnon formula, while protein content was measured using Lowry method. The result showed that the highest 􀄮 chlorophyll content was owned by CPG24 isolate(5,671 mg/l), at the 28th day. While the highest protein content was owned by CPG08 isolate (12,724 mg/ml), at the 35th day. The increasing of 􀄮 chlorophyll and protein content was followed by increasing of bioma
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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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