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: Sintesis Gel Kitosan - Hialuronat
Abstrak: As a polycation, chitosan can form macromolecular complexes with polianions such as hyaluronate. However, the film produced are unstable in acidic and basic conditions that modification is needed to improve the rheological properties. Modification was done in this study by adding glutaraldehyde as chitosan crosslinker.The rheological properties measured ware gel strength, break point, rigidity, swelling, and shrinking. The hyaluronate solutions ware made with consentrations of 0; 0.5; and 1.0% in lactic acid 18% (v/v). Chitosan was then added into each solution until its concentration reached 2.0%. Afterwards, glutaraldehyde 1.0; 2.0; and 3.0% (v/v) was added, to form gel. Chitosan used in this reseach had molecular wight of 7.53 × 105 g mol-1 with moisture content of 11.56% and deacetylation of degree 88.48%. Hyaluronate had molecular wight of 6.33 × 105 g mol-1with moisture content of 13.11%. The optimum chitosan-hyaluronate gel was at 2.0% of chitosan, 0.3 % of hyaluronate and 1.4% (v/v) of glutaraldehyde with gel strength, break point, rigidity, swelling, and shrinking 678.4 g cm-2, 1.294 cm, 5.033 g cm-1, 2.634 g, and 0.148 g, respectively.
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Judul: Perilaku Kuau Raja (Argusianus argus argus Linnaeus,1766) di Taman Burung Taman Mini Indonesia Indah
Abstrak: Kuau raja (Argusianus argus argus) adalah spesies burung yang dilindungi karena populasinya yang menurun seiring dengan hilangnya habitat aslinya. Hal itu mendorong upaya pelestarian kuau raja secara eksitu, salah satunya di Taman Burung TMII. Penelitian ini dilatar belakangi oleh minimnya data mengenai perilaku harian kuau raja. Penelitian ini bertujuan untuk mengidentifikasi dan mendeskripsikan perilaku kuau raja serta menganalisis pengaruh kandang kubah terhadap perilaku kuau raja. Penelitian ini dilakukan pada bulan Maret-April 2019 di Taman Burung TMII menggunakan metode focal animal sampling. Hasil penelitian menunjukkan terdapat enam jenis perilaku kuau raja yang teramati yakni perilaku bersuara, bergerak, menelisik, makan, minum, dan istirahat. Frekuensi dan durasi perilaku tertinggi baik oleh jantan maupun betina adalah perilaku istirahat. Aktivitas harian kuau raja berlangsung selama 11 jam mulai pukul 06.00 WIB hingga 18.00 WIB. Hasil penelitian menunjukkan bahwa frekuensi perilaku menelisik dan minum secara signifikan dipengaruhi oleh kandang kubah, sedangkan frekuensi perilaku bersuara, bergerak, istirahat dan makan tidak secara signifikan dipengaruhi oleh kandang kubah. Sementara itu, durasi perilaku makan, bergerak, minum dan istirahat secara signifikan dipengaruhi oleh kandang kubah, sedangkan durasi perilaku menelisik dan bersuara tidak secara signifikan dipengaruhi oleh kandang kubah.
Keyword: kuau raja, perilaku harian, TMII