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: Sintesis Nanokomposit Kaolin/TiO2 Teremban Fe2O3 untuk Adsorpsi-Fotodegradasi Biru Metilena
Abstrak: Kaolin is a type of clay mineral that has adsorption capacity. The experiment shows that the adsorption capacity of kaolin was 20.6 mg/g. This value is lower than zeolite adsorption capacity that in general has value above 100 mg/g. Mixing kaolin with other materials to form nanocomposite, may improve its adsorption properties. Nanocomposites that had been synthesized were kaolin/TiO2 nanocomposites with the addition of Fe2O3 using 2 synthetic methods, namely using ball milling and paste methods. The nanocomposite synthesized using ball milling method had higher adsorption capacity value, i.e. 23.6 mg/g. The nanocomposite of kaolin/ TiO2 was able to adsorb and degrade waste dyes in ultraviolet range. Furthermore, addition of Fe2O3 to the kaolin/TiO2 nanocomposite improved the performance of the nanocomposite by reacting under the visible rays. Therefore, the performance of nanocomposite of kaolin/TiO2 added with Fe2O3 was is more effective since visible ray is the major part of the sun light.
Keyword: nanocomposite of kaolin/TiO2/Fe2O3., kaolin, photodegradation, adsorption

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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