Judul: Kajian Kadar dan Sebaran Logam Berat Timbal (Pb) dalam Daging, Hati, dan Ginjal Ayam Broiler
Abstrak: Lead (Plumbum) is a heavy metal that can cause poisoning and can be accumulated in the animals body. The aims of this research were to measure the level of lead accumulation and to examine the lead distribution pattern in the meat, liver, and kidney of broiler chickens. The tissue sampels were collected from nine chickens, which origin village are Jasinga, Caringin, and Cihideung. The lead concentration in tissues was measured by using Atomic Absorbance Spectrofotometry machine and the lead distributions was approached using rhodizonate staining. The lead measurement results showed that the highest level is found in liver and kidney of broiler chicken. The distributions of lead metal in liver tissue were located in blood vessel, sinusoid and hepatocyte. Its distributions in kidney tissue were found in glomerular tissue and proximal tubules at the kidney cortex. In the meat, the lead was scattered in blood vessels of connective tissue and was not found in muscle cells.
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Judul: Kajian Kadar dan Sebaran Logam Berat Timbal pada Daging, Hati, dan Ginjal Sapi Potong
Abstrak: The purpose of this research was to examine the lead levels and to explain the histological lead pattern distribution in meat, liver and kidney tissues of cows. Lead content was measured using Atomic Absorption Spectrophotometry (AAS) and Rhodizonate histological staining method. Result showed the lead levels in the cow’s meat, liver, and kidneys tissues were respectively 1.03 ppm, 1.59 ppm, 1.18 ppm in cows from Bogor; 1.45 ppm, 1.68 ppm, 1.001 ppm in cows from Boyolali; 1.25 ppm, 1.52 ppm, 1.16 ppm in cows from Gresik. Lead distribution was found in the connective tissue of the meat, in the hepatosit and portal triad of the liver, and in glomerular and proximal tubules of the kidney. It could be concluded that the lead levels has exceeded the threshold, with the highest levels found in cow’s liver from Boyolali. Lead pattern distribution was found in the connective tissue of the meat, in the hepatosit and portal triad of the liver, and in glomerular and proximal tubules of the kidney. Lead pattern distribution has no relation with the value measured as happened to meat.
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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