Judul: Aplikasi dan Karakterisasi Sifat Fisik-Mekanik Plastik Biodegradable dari Campuran LLDPE dan Tapioka
Abstrak: Plastik mempunyai peranan penting dalam kehidupan manusia. mulai dari sekedar pemenuhan kebutuhan yang sangat sederhana sampai pada kebutuhan yang serba rumit dan canggih. Akan tetapi, sampah plastik menjadi masalah lingkungan berskala global karena plastik tidak dapat terombak dalam lingkungan. Pengembangan bahan plastik biodegradable merupakan salah satu alternatif untuk memecahkan masalah ini.
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Judul: Produksi Plastik Komposit dari Campuran Tapioka-Onggok Termoplastis dengan Compatibilized Polietilen
Abstrak: One of alternative solution for plastic disposal problem is by developing biodegradable plastic. The typical drawbacks of starch-based plastic is inferior of its physico-mechanical properties. In order to improve the physico-mechanical properties and compatibility of blending system, tapioca-casava bagasse was modified into thermoplastic tapioca-casava bagasse blends while polyethylene was compatibilized by addition maleic anhydride. The aim of this research was to produce composite plastic from thermoplastic tapioca-casava bagasse blends and compatibilized polyethylene (compt-HDPE, compt-LDPE and compt-LLDPE). This research investigated the effect of fiber content in formulating the tapioca-casava bagasse blends, as 5, 10, 15 and 20%; glycerol (as plasticizer) concentration, as 30, 35 and 40% to the mechanical, thermal, biodegradability and surface morphological properties of composite plastics. The result showed that fiber contents in blends tapioca-casava bagasse up to 15% can improve physico-mechanical properties (tensile stress at yield, tensile stress at break and thermal properties) but addition of glycerol more than 30% can decrease mechanical composite plastic properties especially for HDPE. Introduction of thermoplastic tapioca-casava bagasse in polyethylene composite plastic generally can decrease physico-mechanical properties plastic. Synthetic polymer that suitable with thermoplastic blends tapioca-casava bagasse was compt-HDPE. The best result gained from 40% thermoplastic blends with HDPE, 15% of fiber and 30% of glycerol contents. Biodegradability test showed that composite plastic can be degraded, but only natural component such as starch and fiber was degraded.
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Judul: Studi histopatologi organ limpa hamster (Mesocricetus auratus) yang Diinfeksi Coxiella burnetii
Abstrak: Query fever is a zoonosis caused by Coxiella burnetii (C. burnetii). The aim of this research was to determine the histopathological changes of spleen of hamster (Mesoscricetus auratus) which were infected by C. burnetii using Haematoxylin-Eosin (HE) and Immunohistochemistry (IHC) methods. This research used 6 hamsters which were devided into two passage. The histopathological examination picture with HE staining of first passage in hamsters showed relatively similar results with those the second passage such as red pulp hemorrhage and infiltration of inflammatory cells. Histopathological observation of spleen from first passage hamster by using IHC staining showed the positivity was unclear compared to the second passage hamster.
Keyword: Coxiella burnetii, Immunohistochemistry, Query Fever