Judul: Membran Komposit Polisufon Tersulfonasi-Natrium Alginat untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Energy demand triggers people to find other renewable energy alternatives, such as fuel cell. In this study composite membrane of sulfonated polysulfone-sodium alginate (sPSf) was synthesized characterized and then applied in direct methanol fuel cell. Sulfonation was started at 40 oC for 1 hour and then sodium alginate was added to improve membrane performances. The degree of sulfonation through sulfonation process was 45% and a peak at 1725 cm-1 in Fourier transform infrared spectrophotometer showed that 1,2,4- substituted sulfonate group exist in ortho position. Composite membrane was produced by adding sulfonated polysulfone and sodium alginate with concentration of 2% and 3%. The composite membrane of sPSf-sodium alginate 3% gave the highest proton conductivity and voltage with values 1.634 х10-3 S/cm and 0.409 volt, respectively. This result showed that the composite membrane of sPSf-sodium alginate can be applied in direct methanol fuel cell system
Keyword: Bogor Agricultural University (IPB), sodium alginate., sulfonated polysulfone, composite membrane, Fuel Cell

Judul: Membran Komposit Polistirena Tersulfonasi - Natrium Alginat untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Membran elektrolit untuk sel bahan bakar metanol langsung adalah Nafion yang nilai permabilitas metanolnya tinggi sehingga diperlukan alternatif, yaitu membran polistirena tersulfonasi (PSS) yang ditambah natrium alginat. Penelitian ini mempelajari pengaruh penambahan natrium alginat pada kinerja PSS. Keberhasilan proses sulfonasi ditunjukkan oleh nilai derajat sulfonasi (DS). DS tertinggi sebesar 99.93% yang didapatkan menggunakan polistirena dengan konsentrasi 15%. Membran komposit dibuat dengan ragam konsentrasi 3%, 5%, dan 7%. Pencirian membran menggunakan spektrofotometer inframerah transformasi Fourier menunjukkan serapan gugus p-SO3 pada 775.42 cm-1 dan serapan gugus garam karboksilat pada 1594.23 cm-1. Mikroskop gaya atomik menunjukkan membran komposit tidak kasar. Membran komposit PSS–natrium alginat 3% memiliki konduktivitas proton dan beda potensial tertinggi sebesar 4.1825 × 10-6 S/cm dan 20 mV. Hal ini menunjukkan membran tersebut dapat diaplikasikan dengan baik dalam sel bahan bakar metanol langsung.
Keyword: komposit, natrium alginat, polistirena tersulfonasi, sel bahan bakar metanol.

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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