Judul: Kajian Paparan Bisphenol-A dari Botol Susu Polikarbonat dalam ASI dan Air pada Bayi
Abstrak: Polycarbonate bottles milk is one of the packaging used to store breast milk. Polycarbonate is the result of polymerization of phosgene and bisphenol A (BPA) that can make plastic to be more transparent, stronger and moreimpact resistant. BPA is carcinogenic and then it can give bad damage for human health even if it is used in very small doses. The study was conducted to determine distribution of respondents who use polycarbonate bottles in Indonesia. It is also to find the effect of bottles pre-treatment before use, including method of sterilization, time and temperature to store the milk and method of milk preparing. Data of the average of baby food intake and baby drinking frequency was recorded and the value of the existing BPA exposure was estimated. From the calculated, it is known that the value of BPA exposure is about 0,00005 mg/kg body weight / day and 0,000002 mg/kg body weight / day for into breast milk water respectively. This value is still below standard tolerances established by the International European Food Safety Authority (EFSA) in 2006 amounted to 0,05 mg / kg body weight / day as Tolerable Daily Intake.
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Judul: Perbandingan migrasi monomer bisfenol A (BPA) pada air minum kemasan plastik polikarbonat (PC) dan polietilena tereftalat (PET): Kajian meta-analisis
Abstrak: Bisfenol A (BPA) merupakan bahan kimia yang umum digunakan dalam pembentukan plastik polikarbonat dan epoksi resin. Plastik tersebut kemudian dijadikan kemasan pangan seperti botol air minum dan botol susu bayi. BPA diketahui dapat bermigrasi dari kemasan botol polikarbonat (PC) dan polietilena tereftalat (PET) ke air minum. Batas toleransi (TDI) BPA awal menurut European Food Safety Authority adalah 50 μg/kg berat badan per hari dan direvisi menjadi 0,2 ng/kg berat badan per hari pada tahun 2023. Sementara tingkat migrasi BPA di botol PC dan PET ditemukan sangat beragam dengan masing-masing total migrasi d apat mencapai 6452,80 ng/L d an 269,87 ng/L. Penelitian ini bertujuan membandingkan jumlah migrasi BPA pada air minum kemasan PC dan PET dengan menggunakan metode meta-analisis. Hasil penelitian menunjukkan tingkat migrasi BPA yang lebih tinggi pada air yang dikemas menggunakan botol PET dengan nilai overall effect size -8,114. Terdapat berbagai variabel yang mempengaruhi migrasi BPA meliputi suhu, lama penyimpanan, perbedaan negara produsen botol air minum, volume air dan paparan sinar matahari. Uji bias publikasi pada funnel plot berbentuk simetris sehingga tidak ada bias publikasi pada penelitian ini. Hal tersebut diperkuat melalui perhitungan fail-safe number (Nft) yang memperoleh nilai Nft> 5N + 10 berarti bias publikasi rendah dan model meta-analisis kuat.
Keyword: bisphenol A (BPA), drinking water, monomer migration, polyethylene terephthalate (PET), polycarbonate (PET)

Judul: The Solution of Nonlinear Volterra Integral Equation using Linearization Method.
Abstrak: Many natural phenomena can be explained by mathematical models. One of those models is in the form of Volterra integral equation, which is usually nonlinear. Analitically, a nonlinear form is difficult to solve. Therefore, this research is aimed to discuss solution of Volterra integral equation using linearization method. Linearization is done to nonlinear integrand with Taylor series expansion. According to this linearization, a numerical solution of Volterra integral equation is obtained using MATLAB 7.0.1 software. Validity of this method is tested by comparing the approximate with the exact solution. The result of this research shows that the numerical solution agree with the exact solution quite well.
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