Judul: Adsorpsi–fotodegradasi Biru Metilena oleh Nanokomposit Kaolin/TiO2 yang Diemban dengan ZnO
Abstrak: Synthetic dye waste such as methylene blue pollutes aquatic evironment. Kaolin/TiO2 nanocomposite was made for adsorption–photodegradation process under UV light. The nanocomposite was prepared by paste and ball milling methods. Semiconductor ZnO was used as dopant to ease photodegradation in visible-light range. X-ray diffraction results showed that kaolin/TiO2 and kaolin/TiO2/ZnO nanocomposites were successfully made. However, ZnO doping decreased crystallinity of the nanocomposites. Scanning electron microscopy results showed that the surface morphology of the nanocomposite made by using paste method and that of doped nanocomposite made by using ball milling method were different. ZnO doping increased the adsorption capacity of the nanocomposite. Photodegradation results showed that ZnO doping improved the photocatalytic activity of the nanocomposites under UV and visible irradiation. However, the photocatalytic activity of the nanocomposites was relatively better under UV irradiation than that under the visible irradiation.
Keyword: photodegradation, kaolin/TiO2/ZnO nanocomposites, kaolin, adsorption capacity

Judul: Nanokomposit kaolin-TiO2 dengan dopan urea untuk adsorpsi dan fotodegradasi zat warna biru metilena
Abstrak: Methylene blue is one type of dyes found as pollutant in Indonesia water system. Kaolin-TiO2 nanocomposite was synthesized and used to overcome this problem by utilizing its adsorption-photodegradation mechanism. Kaolin-TiO2 nanocomposite was made by mixing kaolin powder and TiO2 powder physically using ball milling and paste methods. The ball milling method is found to be simpler than paste method, and also resulting in smaller particle size. Smaller particle size also found to increase both adsorption and photodegradation activities. It is believed that ball milling method also generated a homogenous mixture. From 2 different sample compositions and 3 milling times used, it was found that synthesis kaolin-TiO2 nanocomposite requiring calciumbased binder with an optimum milling time of 5 hours. Kaolin-TiO2 nanocomposite was doped with urea by manual physical mixing followed by calsination at 300 °C for 2 hours. Urea doped-nanocomposite has larger activity than undoped nanocomposite in visible light zone. It means that the photocatalytic activity of urea doped-nanocomposite was successfully shifted to the red zone area of the visible light. Therefore, incident sunlight can be used as energy source in the adsorption-photodegradation process using nanocomposite Kaolin-TiO2.
Keyword: adsorption, ball milling, kaolin, methylene blue, photodegradation

Judul: Pola Distribusi Serabut Saraf Dari Percabangan Plexus brachialis Pada Kambing
Abstrak: Plexus brachialis dibentuk oleh tiga nervus cervical terakhir dan dua nervus thoracalis pertama yang mencabangkan saraf-saraf perifer untuk otot bahu, dinding dada dan kaki depan. Saraf-saraf perifer yang menuju otot tersebut mengandung dua unsur yaitu unsur sensoris dan motoris. Secara makro anatomis penyebaran kedua unsur tersebut belum diketahui sehingga diperlukan informasi penyebarannya secara mikroskopis. Untuk itulah penelitian ini dilakuk:an. Penelitian ini dilaksanakan dari bulan Januari sampai dengan Oktober 2004 di Laboratorium Anatomi, Departemen Anatomi, FKH IPB. Penelitian ini bertujuan untuk mempelajari pola distribusi serabut saraf dan fasikulus cabang dari plexus brachialis kambing yang dikaitkan dengan fungsi dan luasan daerah inervasinya. Hasil penelitian menunjukkan bahwa distribusi serabut saraf lebih banyak menginervasi otot-otot gerak dibandingkan pada otot penahan, pola distribusi serabut saraf pada daerah sensoris semakin meningkat seiring dengan meningkatnya fungsi sensoris daerah inervasi sedangkan fasikulus menunjukkan luas daerah inervasi. Dari hasil penelitian dapat disimpulkan bahwa pola distribusi serabut saraf pada saraf perifer yang dicabangkan oleh plexus brachialis mempunyai korelasi positif dengan luas daerah inervasi dan aktivitas gerak otot.
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