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: Aplikasi Selulosa-g-Poliakrilamida sebagai Fase Diam Kromatografi Kolom dan Sintesisnya Melalui Reaksi Kopolimerisasi Cangkok dan Taut-Silang
Abstrak: The graft and crosslink copolymerization of acrylamide to cellulose isolate have been carried out using N,N’-methylene-bis-acrylamide (MBA) as crosslinker and ammonium peroxydisulfate as initiator. The amount of MBA added were 1.0, 1.5, and 2.0 g. Grafting ratio and efficiency of cellulose-g-polyacrylamide using MBA 2.0 g were the highest, while water absorption capacity was the lowest. Infrared spectrum showed the presence of amide and hydroxyl as well as ether functional groups. Pore size distribution of the product was classified as mesoporous (3.6 nm in diameter). Scanning electron micrograph showed a more tight surface morphology on cellulose-g-polyacrylamide with addition of 2.0 g MBA. Performances of the product were evaluated by high performance liquid chromatography using Curcuma xanthorrhiza extract. The selectivity and resolution value of xanthorrhizol separation in the stationary phase synthesized from 2.0 g MBA addition were 1.276 and 1.870, respectively. Nuclear magnetic resonance spectrum and specific rotation value of the isolated xanthorrhizol proved that the stationary phase did not change the structure and the three-dimensional configuration of the xanthorrhizol, so that it can be proposed as a highly useful value in commercial development.
Keyword: graft copolymerization, crosslinker, chromatography, cellulose

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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