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: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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