Judul: Enrichment of Onggok-Polyacrylamide Superabsorbent by Mixing Superabsorbent with Urea-Starch.
Abstrak: Polimer superabsorben (SAP) berbahan dasar onggok disintesis dengan metode pencangkokan-penautan-silang yang telah dioptimasi menggunakan inisiator amonium persulfat, monomer akrilamida (Aam), dan penaut-silang N,N’- metilena bis-akrilamida. SAP disaponifikasi dengan NaOH 1 M untuk meningkatkan daya serapnya terhadap air. Pengayaan SAP dilakukan dengan mencampurkan urea-pati dengan SAP secara fisik dengan variasi komposisi 2:1, 3:1, dan 4:1. Keberhasilan sintesis dan saponifikasi SAP ditunjukkan oleh pita serapan khas onggok, Aam, dan anion karboksilat pada spektrum inframerah transformasi Fourier serta peningkatan daya serap SAP. Seluruh SAP yang telah diperkaya urea diaplikasikan dalam media air statis dengan selang waktu tertentu untuk melihat pola pelepasan urea terbaik. Campuran SAP dengan nisbah 2:1 memberikan pola pelepasan terbaik dengan waktu pelepasan optimum 4 hari, pelepasan nitrogen sebesar 41.13% (42.6187 ppm), dan laju pelepasan urea sebesar 0.8893 ppm/menit.
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Judul: Pengayaan Superabsorben Onggok-Poliakrilamida dengan Urea Melalui Metode Perendaman.
Abstrak: Superabsorbent can be synthesized from onggok and polyacrylamide using ammonium persulfate and N,N'-methylene bis-acrylamide through grafting-crosslinking methods. Superabsorbent can be enriched with urea fertilizer with slow nutrient-release properties. This superabsorbent enrichment can overcome the losses caused by conventional urea use because urea contains nitrogen nutrient which utilization efficiency is difficult to be increased. Enrichment of superabsorbent with urea was carried out by soaking superabsorbent in urea solution. Maximum enrichment was obtained in superabsorbent soaked in 1000 ppm urea solution for 17 and 24 hours with loading percentage of 36.72 and 32.48%. The release of nitrogen was tested in static aqueous media. Superabsorbent immersed in 1000 ppm urea solution for 17 hours released nitrogen most slowly, in 5 days. Release rate of nitrogen was 0.0370 ppm/min, and the nitrogen release pattern was in accordance with the pattern of plant nutrient uptake.
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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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