Judul: Analisis residu antibiotik (Oksitetrasiklin) pada udang akibat perlakuan sebelum proses pengolahan
Abstrak: Salah satu penyebab terjadinya penolakan terhadap produk ekspor udang adalah ditemukannya antibiotik pada tubuh udang dalam jumlah yang cukup tinggi. Antibiotik yang terdapat pada tubuh udang berasal dari pakan yang diberikan selama udang dibudidayakan di dalam tambak. Pada penelitian ini, proses penetrasi antibiotik ke dalam tubuh udang dilakukan dengan cara perendaman udang di dalam larutan antibiotik (Oksitetrasiklin) dengan konsentrasi 100 ppm. Bahan baku yang telah mengalami perlakuan tersebut, dipisahkan menjadi enam bagian, yaitu untuk perlakuan pencucian (A), penyimpanan dalam suhu kamar selama 5 jam (B), penyimpanan pada suhu 4 °C selama 5 jam (C), penyimpanan pada suhu 0 °C selama 24 jam atau 1 hari (D), perebusan selama 5 menit (E), dan sebagai kontrol (0). Analisa yang dilakukan pada sampel menggunakan HPLC (High Performance Liquid Chromatography), TLC (Thin Layer Chromatography), dan Spektrofotometer Infra Merah (Infra Red). Hasil yang diperoleh dari identifikasi menggunakan TLC, menunjukan bahwa terbentuknya beberapa senyawa lain dengan BM yang lebih besar jika dibandingkan dengan standar antibiotik Oksitetrasiklin. Senyawa-senyawa tersebut diduga ...
Keyword: 

Judul: Analisis Residu Antibiotika Tetrasiklin dalam Susu Bubuk yang Diimpor melalui Pelabuhan Laut Tanjung Priok
Abstrak: Using antibiotics in dairy farm are popular for therapy or applied as a stimulant growth. However, the presence of antibiotic residue in milk causes harmful effects on consumer's health. Tetracycline is one of the antibiotic used in an effort to improve the health of livestock, especially in disease treatment. The aim of this research was to analyze tetracycline residue in imported milk powder. Sixty imported milk powder samples were collected at Tanjung Priok Sea Port. All samples were tested using enzym linked immunosorbent assay (ELISA) as a screening test and the result showed 8 out of 60 samples (13.33%) were positive of tetracycline residue. Eight samples which were positive determined by ELISA then were confirmed by high performance liquid chromatography (HPLC) method. Five of the 8 samples contained tetracycline residue in the confirmation method. Five samples contained tetracycline residue in a high concentration, which was above the maximum residue limit according to the National Standardization Agency of Indonesia.
Keyword: 

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
Keyword: