Judul: Sintesis dan Karakteristik Membran Nilon yang Berasal dari Limbah Benang
Abstrak: Teknologi membran saat ini terus mengalami kemajuan. Banyak hal menarik yang dapat dipelajari dari membran ini, sehingga banyak ide-ide bermunculan dalam segi pembuatan membran sintesis dari berbagai bahan, yang selanjutnya dapat digunakan atau dapat menggantikan fungsi membran alami. Tujuan penelitian ini yaitu untuk mengetahui dan mempelajari pengaruh penambahan TiO2 terhadap kandungan senyawa yang terdapat pada benang nilon pasaran dan terhadap sifat listrik maupun mekaniknya. Pembuatan membran dilakukan dengan metode inversi fase dengan berbagai variasi bobot. Karakterisasi yang dilakukan meliputi: sifat listrik (impedansi, kapasitansi, konduktansi dan loss coefficient), sifat mekanik (kuat tekan dan kuat tarik) dan analisis senyawa membran nilon dengan FTIR. Membran yang memiliki sifat mekanik yang paling baik diperoleh pada membran dengan bobot nilon 3,5 g dan 6,0 g, yang selanjutnya dari hasil mekanik ini dilakukan pendadahan TiO2. Senyawa yang terkandung pada membran nilon yang diamati menggunakan FTIR memperlihatkan terdapat PO4 baik pada membran murni maupun pada membran yang sudah didadah TiO2.
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Judul: Karakterisasi Membran Komposit Nilon-Arang Untuk Proses Filtrasi Timbal.
Abstrak: Research about membrane technology that made from nylon thread with extra banana peel kepok charcoal had been done. Membranes had been made from ingredient variation, there are 6.9 g, 6.6 g, 6.5 g, 6.5 g, and 6.5 g nilon thread which added by ingredient of banana peel kepok charcoal in a series are 0.1 g, 0.4 g, 0.5 g, 0.75 g, and 0.25 g. This research had been analyzed about electrical properties, mechanic, and FTIR (Fourier Transform Infra Red) spectrum from membranes that had been made. In addition, the resulting solution filtration tested include density, viscosity, and metal content. Result of this research showed that membrane with ingredient 6.5 g nylon thread added 0.5 g banana peel kepok charcoal is good enough to degradate plumbum in the water. Electrical properties tested by LCR meter showed that the shift curves that prove a change in the electrical properties of the membrane before and after filtration. FTIR tested showed that banana peel charcoal has functional group that are stretching O-H, C=N, C=C, C-N aromatic and C-O. Membrane of nilon thread which added banana peel kepok charcoal has functional group amide and hydrocarbon but both of them are overlap.
Keyword: Bogor Agricultural University (IPB), plumbum, membrane, filtration, Banana peel kepok charcoal

Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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