Judul: Distribusi Logam Berat pada Kerang Hijau (Perna viridis) dari Perairan Kamal Muara, Tangerang-Jakarta
Abstrak: Shells are filter feeder animals which use gills to shift feed. This process accumulated metallic substance in the body. The nature of major heavy metal is difficult be degraded, so easy to be accumulated in aquatic environment and natural substance. The research was carried out at Laboratory of Raw Material Characteristic of Aquatic Product, Departement of Aquatic Product Technology, Faculty of Fisheries and Marine Science for preparation; metal analyses at Laboratory MIPA Bersama, Faculty of Animal Science, Bogor Agriculture University from November 2013 to January 2014. Objectives of this study is to determine the distribution of heavy metal on variety of size and body part of green mussle that are meet, gills, and viscera using Atomic absorption spectrophotometer. Result showed the highest metal in sample is Cu. Based on the size shells metal distribution on meat, gills, and the viscera were large (1.667 ± 0.104 ppm; 1.329 ± 0.05 ppm; and 1.542 ± 0.064 ppm), medium (1.517 ± 0.05 ppm; 1.427 ± 0.073 ppm; and 2.512 ± 0.05 ppm), and small (1.521 ± 0.210 ppm; 1.101 ± 0.028 ppm; and 1.655 ± 0.127 ppm).
Keyword: green shell (Perna viridis), viscera, gills, meat

Judul: Kandungan Logam Berat Hg, Pb Dan Cr Pada Air, Sedimen dan Kerang Hijau (Perna Viridis L.) Di Perairan Kamal Muara, Teluk Jakarta
Abstrak: Pencemaran di laut salah satunya disebabkan oleh logam berat. Logam berat merupakan bahan anorganik yang bersifat toksik dan dapat terakumulasi dalam tubuh biota air. Kerang hijau (Perna viridis L.) adalah biota yang digunakan sebagai bioindikator adanya pencemaran logam berat. Peneilitian ini dilaksanakan di Perairan Kamal Muara, Teluk Jakarta dari bulan September hingga November 2004. peneiltian ini mengkaji kandungan logam berat Hg, Pb dan Cr dalam air, sedimen dan kerang hijau (Perna viridis L.) dan melihat peranan parameter kualitas air terhadap kandungan logam berat di dalam tubuh kerang hijau (Perna viridis L.). Pengambilan contoh air, sedimen dan kerang hijau (Perna viridis L.) dilakukan di 3 stasiun dengan selang waktu pengambilan contoh adalah selama 1 bulan. Hasil penelitian ini menunjukkan rata-rata kualitas Perairan Kamal Muara masih berada pada kisaran normal. Kandungan logam Hg, Pb dan Cr di kolom air berfluktuatif antara 0,00004 – 0.056 ppm. Pada sedimen nilai rata-ratanya antara 0,019 – 13,15 ppm. Dan rata-rata nilai kandungan logam di dalam tubuh kerang hijau (Perna viridis L.) sebesar 0,062 – 47,813 ppm. Rata-rata nilai faktor konsentrasi dalam tubuh kerang hijau (Perna viridis L.) 64,68 – 11270,40. logam Pb dan Cr cenderung diakumulatif tinggi dibanding dengan logam Hg oleh kerang hijau (Perna viridis L.). Hasil analisis PCA menunjukkan adanya peranan dari parameter kualitas perairan terhadap kandungan logam berat Hg, Pb dan Cr di dalam tubuh kerang hijau (Perna viridis L.).
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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