Judul: Shelf life determination of sweet potato chips and taro chips in plastic and aluminium foil packaging
Abstrak: Mentawai island has great potensial on producing sweet potato and taro. The huge number of the production must be balanced by proper-harvest handling. The handling method is by making the comodities as chips by vaccum frying and then will be packed using plastic and aluminium foil packaging. This research is to determine shelf life of sweet potato chips and taro chips and to decide what kind of the best packaging. Shelf life was determined by using acceleration method with Arrhenius equation. Critical parameter for determining the shelf life was flavour. The shelf life of sweet potato chips at room temperature (25oC) was 155 days using aluminium foil, 117 days using PP, and 37 days using HDPE. Whereas storing life of taro chips was 287 days using aluminium foil, 60 days using PP, and 56 days using HDPE. The best packaging for sweet potato chips and taro chips are aluminium foil.
Keyword: shelf life, packaging, taro chips, sweet potato chips

Judul: Estimation of Shelf Life Banana Chips “Barong Chips” with the Accelerated Shelf-Life Testing (ASLT) Method
Abstrak: Keripik pisang “Barong Chips” merupakan salah satu produk olahan pisang dari Desa Klirong, Kecamatan Klirong, Kabupaten Kebumen, Jawa Tengah. Keripik pisang dapat mengalami penurunan mutu selama penyimpanan akibat pengaruh kondisi lingkungan seperti RH, oksigen, kemasan, dan suhu penyimpanan, sehingga perlu dilakukan pencantuman informasi umur simpan. Penelitian ini bertujuan mengetahui karakteristik awal, mengidentifikasi penurunan mutu selama penyimpanan, dan melakukan pendugaan umur simpan. Pengamatan dilakukan terhadap produk yang dikemas menggunakan plastik polypropylene dengan tebal 0,05 dan 0,08 mm, pada tiga suhu yaitu 25 , 35 , dan 45ºC selama 8 minggu. Parameter yang diamati yaitu kadar air, asam lemak bebas (FFA), kekerasan, dan kecerahan warna setiap 7 hari sekali. Karakteristik awal keripik pisang yang digunakan memenuhi SNI 01-4315-1996, kecuali kadar lemak. Hasil penelitian menunjukan perubahan mutu berupa peningkatan kadar air dan FFA, serta penerimaan panelis. Pendugaan umur simpan dilakukan berdasarkan parameter yang menyebabkan produk cepat rusak yaitu laju peningkatan kadar air. Umur simpan keripik pisang “Barong Chips” pada suhu ruang (30ºC) yaitu 84 hari., “Barong Chips” is one of banana chips produced by a small scale enterprise Klirong Village, Kebumen, Central Java. Banana chips quality will decrease during storage time due to the influence of environmental conditions such as RH, oxygen, packaging, and storage temperature, so it is necessary to include information on shelf life. The study objective are determining the initial characteristics of “Barong chips”, identifying its quality changes during storage time, and estimating its shelf life. The research was conducted by storing the product that packed in 0,05 and 0,08 thickness polyprophylene film, at three level of temperatures, i.e. 25 , 35 , and 45ºC for 8 weeks. The parameters observed were moisture content, free fatty acid (FFA), hardness, and color brightness every 7 days. The initial characteristics are appropriate to quality standards, except for fat. The result showed changes in the form of an increase in water content and FFA, as well as panelist acceptance. Estimation of shelf life is carried out based on the parameters that cause the product to spoil quickly, the rate of increase air content. The shelf life of “Barong Chips” banana chips at room temperature (30ºC) is 84 days.
Keyword: ASLT, “Barong Chips”, packaging, shelf life

Judul: Analisis kestabilan model penyebaran gonorrheae
Abstrak: Gonorrheae merupakan sejenis penyakit kelamin yang disebabkan oleh bakteri gonococcus yang menyebar melalui hubungan seksua!. Penderita 'penyakit ini umumnya para pekerja seks alau mereka yang melakukan seks tak wajar. Penyakit ini memiliki karakteristik unik yang mendasar yakni tidak ada kekebalan, artinya bahwa bila penderita yang dinyatakan sembuh kemungkinan untuk terjangkit sangat besar dan setiap individu yang rentan akan terinfeksi jika berhubungan seksual dengan penderila penyakit Inl. Martin Braun (1975) membuat suatu model epidemik tentang penyebaran penyakit gonorrheae. Pemodelan ini hanya membahas penyebaran gonorrheae yang disebabkan oleh hubungan seksual lawan jenis (heteroseksual).
Keyword: