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
Keyword: 

Judul: Analisis Metagenomik Mikroalga Prokariot dari Perairan Laut Jawa Timur
Abstrak: Mikroalga adalah kumpulan mikroorganisme uniseluler yang dapat berfotosintesis dan menjadi alternatif bioenergi yang potensial untuk dikembangkan. Sebelumnya, penelitian mengenai boidiversitas mikroalga di laut Jawa Timur telah dilakukan secara morfologis. Penelitian ini bertujuan menganalisis metagenomik mikroalga prokariot di perairan laut Jawa Timur. Sampel dari penelitian sebelumnya, yang berasal dari Madura (M3, M4, M6, M9), Banyuwangi (BW) dan Situbondo (ST), dikulturkan kemudian disekuensing dengan metode NGS (Next Generation Sequencing) menggunakan primer 16S rRNA. Data sekuens dianalisis menggunakan Geneious Prime 2020.1.2 dengan mengacu pada database 16S microbial dari NCBI. Terdapat 6 ordo dan 17 spesies teridentifikasi dari divisi Cyanobacteria. Ordo Oscillatoriales terdapat pada seluruh sampel dengan rata-rata frekuensi 43,25%. Crocosphaera watsonii dan Laspinema etoshii terdapat pada kelima sampel kecuali M6. Situbondo memiliki spesies paling banyak yaitu 16 spesies sedangkan M6 hanya memiliki satu spesies. Indeks keanekaragaman tergolong rendah hingga sedang, sedangkan indeks dominansi tergolong rendah hingga tinggi., Microalgae are mixture of unicellular photoautotroph organisms and have big potential to be developed as an alternative bioenergy. Previous research has been carried out on the diversity of microalgae from East Java Coastal Area using morphological identification. This study aims to analyze the prokaryotic microalgae diversity using metagenomics approach. Seawater samples from previous studies, which came from Madura (M3, M4, M6, and M9), Banyuwangi (BW) and Situbondo (ST), were cultured and then sequenced by NGS applying 16S rRNA primers. Analysis was carried using the Geneious Prime 2020.1.2 program referring to the 16S microbial database from NCBI. There are 6 orders and 17 species classified from the Cyanobacteria division. The Oscillatoriales order is found in all samples with an average frequency of 43,25%. Crocosphaera watsonii and Laspinema etoshii were found in five samples, except M6. Situbondo had the most species, namely 16 species, while the M6 sample only had 1 species. Diversity index is classified as low to moderate, while the dominance index is classified as low to high.
Keyword: 16S rRNA, Cyanobacteria, metagenomics, microalgae, prokaryotes

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: