Judul: Methanol Permeability on Membrane Electrode Assembly Chitosan-Sulfonated Polysulfone Composite
Abstrak: Sel bahan bakar dianggap sebagai solusi dalam permasalahan krisis energi. Penggunaan membran elektrolit berbasis polisulfon (PSf) pada direct methanol fuel cell (DMFC) telah meluas karena harganya yang murah dan dapat dioperasikan pada suhu tinggi, namun hidrofilisitasnya rendah. Kitosan mampu meningkatkan hidrofilisitas PSf karena adanya gugus -OH dan -NH2. Penelitian ini bertujuan membuat membrane electrode assembly (MEA) berbasis komposit PSf tersulfonasi (sPSf)-kitosan dan mengkaji pengaruh modifikasi membran dan konsentrasi metanol umpan terhadap permeabilitas membran. Pembuatan MEA berhasil dilakukan dan dibuktikan dengan terbentuknya lapisan katalis karbon melalui analisis scanning electron microscope (SEM). Penambahan kitosan dengan konsentrasi tertinggi (5%) meningkatkan water uptake sebesar 586,34%. Membran sPSf-kitosan 5% pada metanol 20% menghasilkan permeabilitas terendah, yaitu sebesar 1,86 × 10-7 cm 2 ·s -1 . Kajian ini membuktikan bahwa penambahan kitosan dan konsentrasi metanol umpan yang pekat akan menurunkan nilai permeabilitas membran.
Keyword: Membrane Electrode Assembly, Polisulfon, Sel bahan bakar, Kitosan

Judul: Membran komposit polisulfon tersulfonasi–kitosan untuk aplikasi direct methanol fuel cell
Abstrak: Krisis energi memicu suatu inovasi baru dalam upaya pemenuhan energi. Sel bahan bakar metanol merupakan salah satu energi alternatif yang sedang dikembangkan. Penelitian ini menyintesis dan mencirikan membran komposit polisulfon tersulfonasi-kitosan (spsf-kitosan) serta mempelajari pengaruh penambahan kitosan pada kinerja membran. Polisulfon disintesis dengan oleum sebagai agen sulfonasi pada suhu 40 °c selama 60 menit. Membran komposit dihasilkan dengan menambahkan polisulfon tersulfonasi dan kitosan dengan konsentrasi 4% dan 5%. Keberhasilan proses sulfonasi ditunjukkan oleh nilai derajat sulfonasi, yaitu 45%. Selain itu pada pencirian membran menggunakan spektrofotometer inframerah transformasi fourier terdapat puncak yang tertrisubstitusi 1,2,4- pada 1724 cm-1. Uji sem menunjukkan bahwa terlihat interaksi fisik pada membran komposit. Membran komposit spsf–kitosan 5% memiliki konduktivitas proton dan beda potensial tertinggi sebesar 1.74 х 10-3 s/cm dan 427 mv dengan elektrode logam. Berdasarkan hasil, membran komposit spsf-kitosan dapat diaplikasikan dalam sistem direct methanol fuel cell
Keyword: kitosan, membran komposit, polisulfon tersulfonasi, sel bahan bakar

Judul: Ragam jenis ektoparasit burung tekukur (Streptopelia chinensis) dan burung puter (Streptopelia bitorquata) di penangkaran
Abstrak: Spotted dove and Javan turtle dove are the bird species that are easily raised in captivity. Nevertheless, good management is required to successfully breed and raise the birds in captivity; otherwise, the condition may endanger the sustainability of the two bird species. Information on ectoparasites on the bodies of this bird as well as their captivity breeding has not been available, although admittedly taking ectoparasites from these bird families has much been done so that a research is obviously needed. This study aimed to find out various kinds of Spotted dove and Javan turtle dove ectoparasites and to learn various kinds of parasitic insects around the Spotted dove and Javan turtle dove cages. The study was conducted from April to June 2010. The methods of data collection included the general condition of the location, collection of ectoparasites specimens, processing and specimens identification. The data analysis was done descriptively and tabulated with the degree of infestation. The kinds of ectoparasites from the class of insects found in the body of Spotted dove were Goniocotes sp. and Columbicola columbae of phthiraptera order and Pseudolynchia canariensis of diptera order, and arachnida class, that is, tungau from the pterolichidae family. In terms of ectoparasites, Spotted dove and Javan turtle dove were similar, except that Javan turtle dove had no Pseudolynchia canariensis. Goniocotes sp. and Columbicola columbae were mallopaga order (biting lice) and were obligate. The kinds of parasitic insects in the vicinity of Spotted dove and Javan turtle dove cages were from the Ordo Diptera. The diptera classified as parasites included Anopheles, Culex, Psychodidae, Culicoides and Simulium, most of them vectors of disease. The presence of ectoparasites was closely related to how a breeding place is managed.
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