Judul: Sintesis Selulosa-g-Poliakrilamida Melalui Teknik Kopolimerisasi Cangkok dan Taut-Silang
Abstrak: Cellulose-g-polyacrylamide copolymer has been synthesized by graft and crosslink copolymerization using acrylamide as monomer and N,N’-methylenebis- acrylamide as crosslinker. The synthesis was carried out at 70 °C through radical polymerization by using ammonium persulphate as initiator under N2 atmosphere. The functional groups and morfology of the product were characterized by using infrared spectroscopy and scanning electron microscopy, respectively. The infrared spectra and the micrographs confirmed that graft and crosslink copolymerization has been successfully carried out onto cellulose isolates. Increasing crosslinker concentration increased the grafting ratio and efficiency, while the water absorption capacity was decreased. The grafting ratio and efficiency were 27.27–39.02% and 80.78–90.06%, respectively, while water absorption capacity was ranged between 1.6343 and 3.0747. Modification products have better resistance against solvents (ethyl acetate, heptane, hexane, and toluene) and low water absorption capacity so are potencial to be applied as stationary phase.
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Judul: Modifikasi selulosa dengan teknik pencangkokan dan penautan silang menggunakan akrilamida
Abstrak: Modification of cellulose was carried out by grafting and crosslinking copolymerization using acrylamide as monomer, N,N’-methylene-bis-acrylamide as crosslinker, and ammonium peroxydisulfate as initiator. The chemical structure of monomer will affect the properties of modified cellulose such as hydrophilic and hydrophobic characters, elasticity, ion exchange capability, absorptivity, and heat resistance. Infrared spectra showed that cellulose has been modified. It could be seen from C=O streching absorption at 1650 cm-1 and –NH2 streching at 3182.55 cm-1. Both absorption peaks indicated that grafting and crosslinking had been carried out. Modified product had been 31–50% grafted. The final product also weighed 69 times higher than its initial weight with percentage of absorbed water to initial sample weight of 6755% after for 24 hours and became 93 times and 9187%, respectively, after 48 hours.
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Judul: Etno-ornitologi Burung Kancilan Flores (Pachycephala nudigula nudigula Hartert 1897) pada Masyarakat Lio di Taman Nasional Kelimutu
Abstrak: Bare-throathed whistler is one of several wild birds in Kelimutu National Park (TNKL) that is believed to have correlation with Lio Community‟s belief. The estimation of Bare-throated whistler‟s population in Kelimutu National Park was about 186.41-1668.07 individual by the density about 0.0389-0.3481 ind/ha with the sex ratio 6.2:1 that spreaded on area with height of 1100 – 1600 masl. The characteristic of Bare-throated whistler‟s habitat is a natural forest with various canopy level, high plant species diversity and high density. The habitat characteristics related to the availability of food in the form of insects, cover, safety and a nesting site. Generally the most of Lio community knew the existence of Bare-throated whistler directly or from their parents‟ stories. The perceptions of Lio Community to the Bare-throated whistler‟s existence is generally support the conservation efforts. The perceptions construct the Lio Community‟s atitude that tend to be conservative to the existence of Bare-throated whistler. The attitude shown by their behavior that not cathing the Bare-throated whistler from the TNKL‟s area or the outside. The attitude have an important role to the existence of Bare-throated whistler in Kelimutu National Park‟s area.
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