Judul: Kajian Residu Beta Laktam dalam Susu Pasteurisasi Impor dari Australia melalui Pelabuhan Udara Soekarno-Hatta
Abstrak: Beta-lactam antibiotic residue occurs in pasteurization milk due to application of beta-lactam antibiotic in dairy cattle treatment. The residue does not only create problems in dairy industry but also have impact on public health. The aims of the study were to determine the presence and the amount of beta-lactam antibiotic in imported pasteurization milk. Sample size was calculated using the formula to detect disease according Canon and Roe (1982) cited by Martin et al. (1987). The sixty samples of imported pasteurized milk from Australia were used in this study. The bioassay (screening test) was used and followed by confirmation test used high performance liquid chromatography (HPLC). Both of the tests showed negative result. It means all of the samples did not contain beta-lactam antibiotic.
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Judul: Analsis Residu Antibiotika dalam Daging Sapi yang Diimpor melalui Pelabuhan Tanjung Priok
Abstrak: Antibiotics are natural products of a microorganism, identical synthetic products or similar semi synthetic products that inhibit the growth of or destroy microorganisms. In veterinary medicine antibiotics are used for therapeutic, prophylactic, metaphylactic and nutritive purposes. The presence of antibiotics or their metabolites in food is potentially hazardous to health as it may cause allergic reactions in people and antibiotic resistance in pathogenic microorganisms. In addition antibiotics may influence starter cultures in food industry and lead to economic damage. The aims of this research were to detect antibiotic residue in imported beef and to analyze the effectivenes of rapid test as screening method to detect antibiotic residue in imported beef as a part of quarantine inspection. Samples size was calculated using detect disease formula and selected by random sampling. Datas regarding the proportion of antibiotic positive samples were analyzed descriptively. Rapid test showed that, 24 of the 70 samples (34.29%) contained antibiotic residue, while 17 (24.29%) samples contained antibiotic residue detected by using bioassay. Bioassay showed that samples contained beta lactams, tetracycline, macrolide, and aminoglycoside.
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Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell