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: Status cemaran logam timbal (Pb) pada mahasiswa fakultas peternakan Institut Pertanian Bogor
Abstrak: Lead (Pb) has been intensively used in industry. Application of Pb creates environmental and health problems. Present experiment aimed to clarify the exposure of Pb as pollutant on the student of Faculty of Animal Sciences, Bogor Agricultural University and its relation to their activities and diets. Hair samples of 5-10 g each were obtained from 25 male and 25 female students. Concentration of Pb, Ca, Zn and Mg in hair was determined using an atomic absorption spectrophotometer. Questionnaire was offered to the students, to evaluate their activities and diets. Concentration of Pb in hair samples obtained from the male and female students was not different. However, Ca, Zn and Mg concentration in the hair of male students was higher (P<O.Ol) than that of female students. Lead concer~tration in the hair could be associated with the exposure level of the students to the polluted air. Protein intake in male and female students was 33.82 glday and 34.94 glday, respectively. It was concluded that the students were exposured to Pb polluted-air. The activities and diets of the students had no effect on the level of Pb in their hair. Key words: lead, hair, activity, diet, protein.
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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