Judul: Karakterisasi dan Uji Aktivitas Selulotik Kapang Endofit Makroalga (Sargassum sp, Gracilaria sp, Caulerpa sp dan Gelidium sp) di Habitat Lamun Pulau Pari, Kepulauan Seribu
Abstrak: Macroalgae is one source of raw materials for bioethanol which has good potency to be developed as renewable energy. Bioethanol is a fermented product of carbohydrates that requires molds to produce enzym in breaking down complex cellulose into more simple form. The aims of this research were (1) to explore diversity endophytic molds associated with macroalgae living in seagrass habitats of Pari Island, Kepulauan Seribu ; (2) to measure cellulolytic activity of endophytic molds. A total of 21 isolates molds were isolated from four species of macroalgae, namely Sargassum sp, Gracilaria sp, Caulerpa sp, and Gelidium sp. Molds were isolated using CMC (Carboxy Methyl Cellulose) media, stained using red congo, and enzymatic activities were measured according to Milles method. The highest value of cellulolytic index was observed for Aspergillus westerdijkial isolated from Caulerpa sp (PCLAR 6). Cellulolytic activity of Aspergillus versicolor and Aspergillus sydowii showed optimum performance on day-2, Penicillium citrinum and Aspergillus westerdijkial was on day-1. Cellulolytic enzym showed optimum activity under pH phosphate 7 and temperature of 40 0C.
Keyword: macroalgae, cellulolytic activity, cellulase enzym, molds

Judul: Association of Macroalgae with Seagrass on Pari Island, Thousand Islands
Abstrak: ABSTRAK RIZKY MARTHAULINA KRISTIANI. Asosiasi Makroalga dengan Lamun di Pulau Pari, Kepulauan Seribu. Dibimbing oleh ENDANG SUNARWATI SRIMARIANA dan DEA FAUZIA LESTARI. Penelitian ini bertujuan untuk mengetahui kondisi ekologi makroalga dan lamun seperti komposisi spesies, kerapatan, kepadatan, tutupan dan asosiasi makroalga dengan lamun di Perairan Pulau Pari, Kepulauan Seribu. Kawasan Pulau Pari merupakan wawasan ilmu pengetahuan yang masih perlu perencanaan pengembangan lebih lanjut. Di kawasan ini wisatawan dapat mempelajari Ekosistem lamun yang merupakan salah satu ekosistem penting di laut, disamping mangrove dan terumbu karang yang sebagai pendukung kehidupan biota Penelitian ini dilaksanakan, pada Bulan April sampai Mei 2021 bertempat di perairan Pulau Pari, Kepulauan Seribu. Dalam penelitian ini digunakan metode transek kuadrat pada ekosistem lamun. Transek kuadrat yang digunakan adalah berukuran 50 cm x 50 cm dengan melakukan pengambilan sebanyak sepuluh titik dengan tiga kali pengulangan, dengan masing-masing pengambilan mendapatkan tiga puluh data dalam tiga Stasiun yang berbeda. Hasil penelitian menunjukkan bahwa di perairan Pulau Pari ditemukan 8 jenis makroalga yakni : Acanthophora spicifera, Eucheuma cotonii, Eucheuma edule, Gracilaria salicornia, Halimeda opuntia, Hydroclathrus clatratus, Padina minor, Sarggasum polycystum. Sedangkan jenis lamun yang ditemukan ada 3 jenis yakni : Cymodocea serulata, Enhalus acoroides, Thalassia hempricii Kata kunci: Asosiasi, lamun, makroalga, Pulau Pari, Kepulauan Seribu, ABSTRACT RIZKY MARTHAULINA KRISTIANI. Association of Macroalgae with Seagrass on Pari Island, Thousand Islands. Supervised by ENDANG SUNARWATI SRIMARIANA and DEA FAUZIA LESTARI. This study aims to determine the ecological conditions of macroalgae and seagrasses such as species composition, density, density, cover and association of macroalgae and seagrasses in Pari Island Waters, Thousand Islands. The Pari Island area is a scientific insight that still needs further development planning. In this area tourists can enjoy the beauty of the sea and learn about the ecosystem it has. Such as studying seagrass ecosystems which are one of the important ecosystems in the sea, in addition to mangroves and coral reefs which support the life of biota. This research was carried out from April to May 2021 in the waters of Pari Island, Thousand Islands. In this study the quadratic transect method was used in seagrass ecosystems. The quadratic transect used is 50 cm x 50 cm in size by taking ten points with three repetitions, with each retrieval getting thirty data from three different stations. The results showed that in the waters of Pari Island there were 8 types of macroalgae namely: Acanthophora spicifera, Eucheuma cotonii, Eucheuma edule, Gracilaria salicornia, Halimeda opuntia, Hydroclathrus clatratus, Padina minor, Sarggasum polycystum While there are 3 types of seagrass found namely: Cymodocea serulata, Enhalus acoroides, Thalassia hempricii Keywords : Association, macroalgae, Pari Island, Seribu Island, seagrass
Keyword: Association, macroalgae, Pari Island, Seribu Island, seagrass

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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