Judul: Hidrogel Berbahan Dasar Asam Akrilat dan Karagenan sebagai Penjerap Ion Cu(II).
Abstrak: Hidrogel adalah polimer hidrofilik berbentuk jaringan berikatan silang, berkemampuan swelling dalam air, serta memiliki daya difusi air yang tinggi. Karagenan dapat digunakan sebagai bahan baku dalam pembuatan hidrogel. Tujuan penelitian ini adalah melakukan karakterisasi material dan uji kinerja hidrogel poli(asam akrilat)-ko-iota karagenan dengan teknik irradiasi gamma, dan menguji kapasitas adsorpsi hidrogel terhadap ion Cu(II). Karakterisasi material hidrogel dengan scanning electron microscope (SEM), dan fourier-transform infrared spectroscopy (FTIR). Uji kinerja hidrogel dilakukan dengan equilibrium degree of swelling (EDS), fraksi gel, uji adsorpsi terhadap ion Cu(II) dan isoterm adsorpsi. Nilai fraksi gel, EDS, dan kapasitas adsorpsi terbesar yaitu berturut-turut 96.12%, 694.54 g/g, dan 541.77 mg/g pada sampel 2 g iota karagenan. Pencirian hidrogel menggunakan FTIR menunjukkan serapan gugus –OH, -OSO3-, dan –CO pada bilangan gelombang 3570.24 cm-1, 1226.73 cm-1, dan 1666.50 cm-1. Adsorpsi isoterm menunjukkan hidrogel poli(asam akrilat)-ko-iota karagenan belum mengikuti tipe model isoterm Freundlich dan Langmuir.
Keyword: hidrogel, iota karagenan, isoterm adsorpsi

Judul: Hidrogel Berbahan Dasar Asam Akrilat dan Karagenan sebagai Penjerap Ion Cu(II).
Abstrak: Hidrogel adalah polimer hidrofilik berbentuk jaringan berikatan silang, berkemampuan swelling dalam air, serta memiliki daya difusi air yang tinggi. Karagenan dapat digunakan sebagai bahan baku dalam pembuatan hidrogel. Tujuan penelitian ini adalah melakukan karakterisasi material dan uji kinerja hidrogel poli(asam akrilat)-ko-iota karagenan dengan teknik irradiasi gamma, dan menguji kapasitas adsorpsi hidrogel terhadap ion Cu(II). Karakterisasi material hidrogel dengan scanning electron microscope (SEM), dan fourier-transform infrared spectroscopy (FTIR). Uji kinerja hidrogel dilakukan dengan equilibrium degree of swelling (EDS), fraksi gel, uji adsorpsi terhadap ion Cu(II) dan isoterm adsorpsi. Nilai fraksi gel, EDS, dan kapasitas adsorpsi terbesar yaitu berturut-turut 96.12%, 694.54 g/g, dan 541.77 mg/g pada sampel 2 g iota karagenan. Pencirian hidrogel menggunakan FTIR menunjukkan serapan gugus –OH, -OSO3-, dan –CO pada bilangan gelombang 3570.24 cm-1, 1226.73 cm-1, dan 1666.50 cm-1. Adsorpsi isoterm menunjukkan hidrogel poli(asam akrilat)-ko-iota karagenan belum mengikuti tipe model isoterm Freundlich dan Langmuir.
Keyword: hidrogel, iota karagenan, isoterm adsorpsi

Judul: Habitat characteristics of timor friarbird philemon inornatus in Camplong Landscape Kupang District, East Nusa Tenggara
Abstrak: Timor Friarbird (Philemon inornatus, G. R. Gray, 1846) is one of the six endemic birds of Timor and is a protected species. The population of bird is suspected to have been decreasing over the past six years along with the decreasing of the quantity and quality of physical and biotic factors of its habitat. Knowledge on landscape spatial pattern could be used to evaluate the quantity and quality of habitat. This research aimed at identifying spatial habitat characteristics of Timor Friarbird based on dominant factors of physical and biotic habitat components. Principle Component Analysis (PCA) on the physical habitat factors showed that variables that have strong correlation with the presence of the bird were Normalized Difference Vegetation Index (NDVI), slope, distance from secondary forest, distance from bush, distance from cashew plantation, distance from crop plantation, and distance from roads. The biotic factors that have strong correlation with the presence of Timor Friarbird were the total number of plant species, number of plants used for food and cover, and mean height of trees. Height of poles was the only variable that has no correlation with the presence of Timor Friarbird. The most dominant physical and biotic factors that influent the presence of Timor Friarbird at a site are the density of foraging trees, slope, distance from the river, the distance from secondary forest, the density of cover pole and the distance from road. The estimation population of Timor Friarbird in Camplong region is low; this might be caused by low feeding tree density, high rates of poaching, the uneven distribution of feed vegetation and the flowering season, habitat degradation due to illegal logging, grazing cattle in the wild, and invasion of siam weed or chromolaena (Chromolaena odorata). The results of land cover classification at Camplong region based on Landsat_5 Thematic Mapper (TM) image with ArcGIS 9.3 and Erdas 9.1 obtained 11 land cover classes, with shrub as the dominant class. Keyword: Philemon inornatus, Habitat Spatial Characteristics, PCA, Population, Land Cover
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