Judul: Diversity of Crabs (Decapoda: Brachyura: Portunidae) in the Arafura Sea
Abstrak: Laut Arafura merupakan laut dengan luas 650.000 km2 dengan maksimal kedalaman 3,68 km yang berada di wilayah Propinsi Papua. Kepiting merupakan anggota filum Arthropoda, kelas Malacostraca, Ordo Decapoda, dan Subordo Brachyura. Brachyura yang sering disebut sebagai kepiting sejati merupakan hewan yang sangat beragam pada tingkat infra-ordo. Kepiting berperan sebagai bentos dan spesies kunci, berperan dalam keberlangsungan rantai makanan. Brachyura yang sudah dilaporkan di dunia berjumlah 7250 spesies, adapun spesies yang dilaporkan di Indonesia oleh Kementrian Lingkungan Hidup dan Kehutanan Indonesia sekitar 1400 spesies. Penelitian ini bertujuan mengetahui dan mendeskripsikan spesimen kepiting (Portunidae) yang tertangkap dari Laut Arafura. Metode yang dilakukan adalah mengidentifikasi beberapa spesimen koleksi Prof. Dr. Ali yang berada di Departemen Biologi, IPB University. Spesimen diidentifikasi menggunakan FAO Species Identification Guide for Fishery. Nomenklatur spesies berdasarkan laman World of Registered Marine Species (WoRMS). Berdasarkan hasil pengamatan morfologi yang dilakukan pada spesimen, diperoleh delapan spesies kepiting dari famili Portunidae yaitu, Eodemus unidens; Charybdis (Charybdis) lucifer; Lupocycloporus wilsoni; Charybdis (Archias) hongkongensis; Lupocycloporus gracilimanus; Charybdis (Charybdis) callianassa; Charybdis (Archias) omanensis septentrionalis; dan Charybdis (Charybdis) anisodon., The Arafura Sea is a sea with an area of 650,000 km2 with a maximum depth of 3.68 km in the Papua Province. Crabs are members of the phylum Arthropoda, class Malacostraca, Order Decapoda, and Susubdo Brachyura. Brachyura, often referred to as true crabs, are very diverse animals at the infra-order level. Crabs act as benthos and key species, playing a role in the sustainability of the food chain. Brachyura that has been reported in the world amounts to 7250 species, while the species reported in Indonesia by the Indonesian Ministry of Environment and Forestry are around 1400 species. This study aims to know and describe crab specimens (Portunidae) caught from the Arafura Sea. The method carried out is to identify several specimens collected by Prof. Dr. Ali who are in the Department of Biology, IPB University. Specimens were identified using the FAO Species Identification Guide for Fishery. Species nomenclature based on the World of Registered Marine Species (WoRMS) page. Based on the results of morphological observations made on specimens, eight species of crabs from the Portunidae family were obtained, namely, Eodemus unidens; Charybdis (Charybdis) lucifer; Lupocycloporus wilsoni; Charybdis (Archias) hongkongensis; Lupocycloporus gracilimanus; Charybdis (Charybdis) callianassa; Charybdis (Archias) omanensis septentrionalis; dan Charybdis (Charybdis) anisodon.
Keyword: Arafura sea, Charybdis, Lupocycloporus, morphology, Portunidae

Judul: Exploration of Crab (Crustacea: Decapoda: Brachyura) from the East Coast, North Sumatera
Abstrak: Crustacea merupakan hewan invertebrata yang memiliki tingkat migrasi yang tinggi. Kemampuan migrasi ini terjadi pada fase larvanya yang mengikuti arus dan akan menetap pada habitat yang cocok. Pantai Timur Sumatera yang berada di antara Selat Malaka dan Sungai Deli diprediksi memiliki keanekaragaman kepiting yang tinggi. Penelitian ini bertujuan mengeksplorasi dan mendeskripsikan keanekaragaman kepiting di kawasan Pantai Timur, Sumatera Utara. Metode yang digunakan adalah convenience sampling yaitu teknik pengambilan sampel didasarkan pada ketersediaan dan kemudahan mendapatkan sumber data. Penelitian ini dilakukan pada 4 stasiun penelitian dan sampel difiksasi pada alkohol 70% selama satu 24 jam, selanjutnya disimpan menggunakan alkohol 96% dan satu bulan kemudian alkohol 96% diganti yang baru. Kepiting diidentifikasi menggunakan FAO Species Identification Guide for Fishery Purpose. Hasil sampling didapatkan sebanyak 192 individu, terbagi kedalam 6 famili dan 21 spesies. Famili tersebut terdiri dari Sesarmidae (7 spesies), Ocypodidae (7 spesies), Portunidae (4 spesies) , Macrophthalmidae (1 Spesies), Varunidae (1 spesies) , dan Camptandriidae (1 spesies). Kata kunci : belawan, convenience sampling, larva, selat malaka, Crustaceans are invertebrate animals that have a high migration rate. This migratory ability occurs in the larval phase, which follows the current and will settle in a suitable habitat. The East Coast of Sumatra, which lies between the Strait of Malacca and the Deli river, is predicted to have a high diversity of crabs. This study aims to explore and describe the diversity of crustaceans in the Belawan International Port area, North Sumatra. The method used is convenience sampling, the sampling technique is based on the availability and ease of obtaining data sources. This study was conducted at 4 research stations and samples were fixed in 70% alcohol for one 24 hours, then stored within 96% alcohol relaced with new one. Samples identified using the FAO Species Identification Guide for Fishery Purposes. Sampling results obtained as many as 192 individuals, divided into 6 families and 21 species. The family consists of Sesarmidae (7 species), Ocypodidae (7 species), Portunidae (4 species), Macrophthalmidae (1 species), Varunidae (1 species), and Camptandriidae (1 species). Keywords: belawan, convenience sampling, larva, strait of malacca
Keyword: belawan, convenience sampling, larva, strait of malacca

Judul: The Model of Physical Exercise Effect on the Dynamics of Glucose and Insulin
Abstrak: Regular physical activity is indicated either to prevent or delay the onset of non-insulin-dependent diabetes or to assure a good control of diabetes by increasing insulin sensitivity and ameliorating the metabolism of glucose disappearance. A minimal model developed previously was extended to include the major effects of exercise on plasma glucose and insulin levels. Minimal model of glucose and insulin dynamics created in this study is valid. Result of model simulation is good agreement with experimental data. On the normal subject, physical exercise can reduce blood glucose levels, the same thing happened in people with diabetes. In general, the model can be explained that physical exercise can lower glucose levels basal while after the exercise, but will eventually rise returned to initial basal glucose levels, so to keep the blood glucose remained normal should be done exercise regularly and with the assistance of insulin therapy appropriate to the needs of patients.
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