Judul: Studi Konduktivitas Elektrolit Polimer Kitosan/PVA+KOH
Abstrak: The blend-based polymer electrolyte consist of chitosan and polyvinyl alcohol (PVA) as host polymers and potassium hydroxide (KOH) as the complexing salt was studied. Polymer electrolyte were obtained by the casting technique. An attempt was also made to investigate the effect of TiO2 concentration in the chitosan/PVA+KOH polymer electrolyte. The polymer electrolyte with good ionic conductivity properties were characterized by thermal analysis (DSC), FTIR, SEM, XRD and EDX. The best ionic conductivity values of 1,105 x 10-2 S cm-1 at room temperature were obtained for the sample containing 35%wt of KOH and 1,210 x 10- 2 S cm-1 for the sample containing 50% wt TiO2. The thermal analysis indicates that both glass transition temperature (75.30 °C) and crystallinity are low for chitosan/PVA+KOH 35%.
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Judul: Karakteristik Fluks Membran Kitosan  Termodifikasi Poli(Vinil Alkohol) Dengan  Variasi Poli(Etilena Glikol) Sebagai Porogen
Abstrak: Chitosan-poly(vinyl-alcohol) membrane with glutaraldehyde as cross-linked agent was classified as semi-interpenetrating network (semi-IPN) hydrogel structure. Chitosan is naturally abundant and renewable polysaccharide extracted from crustacean shells (e.g. shrimp and crab). Poly(vinyl-alcohol) or PVA is a synthetic polymer with excellent mechanical properties. Nine types of chitosan- PVA membrane were prepared from dope constituted of chitosan solution 3% (b/v), 33.30 μM glutaraldehyde 25% (v/v), and concentration of both PEG (poly(ethylene glycol)) and PVA varied from 0.0, 2.5, and 5.0%. Diluted acetic acid 1% (v/v) was used as the solvent for the dope preparation. Membrane dope was casted onto a glass plate surface and evaporated for a night at room temperature. It was then immersed in NaOH 1 M as nonsolvent for 2-3 hours. The resulting membrane was rinsed and neutralized by water and then the flux determined using destilled water (pH 7.3) and buffer phosphate pH 6 solution as feed fluids. The flux was measured at various pressure of 2.5, 5.0, 7.5, and 10.0 psi for destilled water and from 2.5 and 10.0 psi for buffer. The flux of destilled water was higher than the flux of buffer. These phenomenon showed sensitive property of hydrogel membrane upon pH environment, as the hydrogel itself was swollen in acetic condition cause reducing the membrane pore diameter. The flux decreased as PVA percentage increased, while increasing PEG percentage as the porogen increased the flux. The applied pressures was the main driving force on membrane transport and the effect on flux decreased the applied pressure increased. It was caused by compaction phenomenon occured on the matrix of membrane as related with the hydrogel structure.
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Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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