Judul: Studi Konduktivitas Elektrolit Polimer Kitosan/PEG+KCl
Abstrak: Solid polymer electrolyte can be classified as a solid material that has the ability to conduct electric current by the movement of ions and has the same functions as an electrolyte solution. Polymer electrolyte film based on chitosan/PEG+KCl have been produced. The process of making is done by mixing a solution of acetid acid with chitosan, PEG and Potassium Chloride (KCl), polymer electrolyte were obtained by the casting technique. Polymer electrolyte with good ionic conductivity properties were characterized by FTIR analysis for the identification of the functional group. The results of FTIR analysis indicates that complexes of polymer electrolyte have formed. The best ionic conductivity values of 5.786 x 10-6 Scm-1 were obtained for the sample containing 45%wt of KCl. Activation energy obtained by using Arrhenius plot, activation energy from polymer electrolyte film with good conductivity is 0.270 eV.
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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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