Judul: Akumulasi Logam Berat Timbal (Pb) dan Pengaruhnya terhadap Histologi Hati Ikan Patin (Pangasius djambal) di Waduk Saguling, Jawa Barat
Abstrak: Saguling is one of five reservoirs built in the Citarum Watershed that potentially contain heavy metals such as Pb. In the process this Pb will be concentrated in the bodies of organisms. That are cultured in the reservoirs such as catfish (Pangasius djambal), and then accumulated. The liver is the organ, where most heavy metals accumulated and potentialy cause necrosis, fibrosis, and cirrhosis. This study becauses analyze the content of Pb accumulated and its effect on liver tissue. It was conducted in 2012, by taking samples form three stations representing the inlet, middle and outlet of the reservoirs. Pb content was extracted with perochloric acid 70-72% and sulfat acid analyzed with AAS (Atomic Absorption Spectrophotometer). The Pb concentration obtained ranged from 8-16.4 mg / Kg, witch already exceeded the SNI 2009 quality standard for food. Liver tissue damage is inflammation and necrosis
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Judul: Kajian Kandungan Logam Berat Timbal (Pb) dan Merkuri (Hg) Pada Air dan Ikan Budidaya Keramba Jaring Apung (KJA) di Waduk Cirata- Jawa Barat
Abstrak: The study was conducted at Cirata reservoir from November 2007 to April 2008. The objective of the study was to analysis timbal (Pb) and mercury (Rg) content both in the water, Common Carp and Oreochromis niloticus liver and flesh and analysis histology. Survey method was used at 3 locations I.e. 1) Citarum basin 2) Cisokan basin and 3) Dangerous zone far floating net cage fish culture activity. Fish~ples were taken from every locations with 3 different age (1, 3 and 5 ) months.The result showed that minimum and maximum values at 2 and 5 m water depth-6for timbal on station two and station one . The minimum values for mercury (Rg) ~n station two and station three and maximum values on station one. Timbal (Pb) ~est concentration inside Common Carp and Oreochromis niloticus liver on statio~ two , where as highest concentration on station three, There are timbal (Pb)inside-xt:'ommon Carp and Oreochromis niloticus flesh, found at the age of disperse 5 mont( with lowest concentration at station two, by concentration 0,00011 mg/kg of Com~n Carp and 0,00016 mg/kg of Oreochromis niloticus body weight respeijively. There are mercury inside Common Carp and Oreochromis niloticus liver!! and 5 months age of disperse, where as mercury not existed in flesh. Age III Influence to timbal concentration Common Carp and Oreochromis niloticus liver at III eve~ station showed significant at level p < 0.05, whereas mercury showed OJ signi~ant of Common Carp liver on station 3. Histological observation showed that there§'-ere necrosis in Common carp and Oreochromis niloticus liver and fish flesh. Keywords :timbal (Pb), mercwy (Hg),water, liverandfishflesh
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Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology