Judul: Cemaran Eschericia coli pada Daging Ayam di Pasar Tradisional Kota Tangerang Selatan
Abstrak: The aim of this study was to observe the total count of Eschericia coli in chicken meat in tradisional markets in South Tangerang City. This study was conducted using survey method by interviewing the vendors of chicken meat as respondents, observing the condition of marketplace using questionnaires, and sampling the chicken meat for laboratory examination. A total of 24 chicken meat samples was obtained purposively from three markets, i.e., Pasar Modern, Pasar Bukit, and Pasar Jombang, and was examined using spread plate method (plate count method). The result of the study showed that Pasar Modern had the best criteria of general hygienic practices. Nevertheless, the laboratory result found that the chicken meat samples from Pasar Jombang showed the highest number of E. coli (5.59 ± 5.64 log10 cfu/gram) and it was followed by Pasar Modern (5.38 ± 5.59 log10 cfu/gram) and Pasar Bukit (5.11 ±5.39 log10 cfu/gram), with the mean of 5.40 ± 5.55 log10 cfu/gram. Compared to the maximum limit of microbial contamination according to the Indonesia National Standard (SNI 7688:2009), 100% of chicken samples from Pasar Jombang were higher than the standard (maximum limit = 1 log10 cfu/gram), and then 100% of samples from Pasar Modern and 100% of samples from Pasar Bukit were higher than standard. The high number of E. coli contamination in chicken meat was supposed in relation with market sanitation, proces eviceration, cross contamination with other food, inadequate personal hygiene practices and lack of cold chain from poultry processing plant until market place.
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Judul: Cemaran Staphylococcus aureus pada Daging Ayam yang Dijual di Pasar-Pasar di Tangerang Selatan
Abstrak: The aim of this study was to observe the total of Staphylococcus aureus in chicken meat sold in markets in South Tangerang City. This study was conducted using survey method by interviewing the vendors of chicken meat as respondents and observation the condition of marketplaces using questionnaires and sampling the chicken meat for laboratory examination. Total of 24 chicken meat samples was obtained purposively from 3 traditional markets, i.e., Pasar Modern, Pasar Bukit, and Pasar Jombang, and was examined with the spread plate method (the plate count method). The result of observation showed that Pasar Modern had the best criteria of general hygienic practices. Nevertheless, the laboratory result found that the chicken meat samples from Pasar Modern showed the highest amount of S. aureus (1116.0 + 1461.0 cfu/gram) and it was followed by Pasar Bukit (618.2 + 1045.8 cfu/gram) and Pasar Jombang (433.3 + 665.8 cfu/gram), with the mean of 802.5 + 1194.2 cfu/gram. Compared to the maximum limit of microbial contamination according to the Indonesia National Standard (SNI 7688:2009), 80% of chicken samples from Pasar Modern were higher than the standard (maximum limit = 100 cfu/gram), and then 66.7% of samples from Pasar Jombang and 54.5% of samples from Pasar Bukit were higher than the standard. The high number of S. aureus contamination in chicken meat was supposed in relation with inadequate personal hygiene practices and lack of cold chain from poultry processing plant until marketplace. This condition should be considered as a risk of food intoxication for the consumers since the presence of S. aureus in food in high number could produce the toxin which is heat-stable.
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Judul: Pembuatan Film Tipis Lithium Niobat (LiNbO3) Menggunakan Metode Chemical Solution Deposition (CSD) dengan Variasi Kecepatan Putar (Rpm).
Abstrak: Film tipis merupakan salah satu aspek yang mendapat perhatian sangat besar dalam bidang material, karena film tipis merupakan material menarik yang memiliki sifat optik yang sangat tergantung pada konstanta dielektrik, indeks bias, dan energi gap. Lithium Niobat (LiNbO3 ) dapat digunakan sebagai pelapis pada film tipis karena memiliki sifat piezoelektrik, electrooptical, pyroelectrical dan photorefractive yang sangat baik. Film tipis Lithium Niobat (LiNbO3 ) ditumbuhkan menggunakan metode Chemical Solution Deposition (CSD) dengan variasi kecepatan 3500 rpm, 5000 rpm, 6500 rpm, dan 8000 rpm. Metode ini memiliki keunggulan dapat mengontrol stokiometri film tipis dengan kualitas yang baik, prosedur yang mudah dan membutukan biaya yang relatif murah. Energi band gap yang dihasilkan dari film tipis Lithium Niobat (LiNbO3) berkisar antara rentang 2.1 eV – 2.8 eV dengan indeks bias berada pada rentang 2.18-3.2. Film tipis LiNbO3 memiliki parameter kisi a=b=5.54Ǻ dan c = 16.35 Ǻ. Struktur morfologi film tipis adalah permukaan yang homogen dan ukuran kristal berada pada rentang 0.417 μm – 0.680 μm.
Keyword: sifat optik, litium niobat, chemical solution deposition, kecepatan putar