Judul: Sintesis superabsorben melalui kopolimerisasi pencangkokan dan penautan silang onggok dengan akrilamida
Abstrak: Solid wastes of tapioca is known as onggok. This study is aiming to see a possibility to increase the value of onggok by transforming it into a superabsorbent polymer through grafting cross-linking copolymerization of acrylamide as a monomer, N,N’-methylenebisacrylamide as a cross-linker, and ammonium persulfate as an initiator. Onggok was used as a backbone in grafting and cross-linking copolymerization. The copolymerization was conducted at 70oC for 3 hours and the copolymer was saponified with NaOH 1M for 2 hours. Water absorbency capacity of the saponified copolymer as well as unsaponified copolymer thereafter were measured. The saponified copolymer showed significant difference in absorbency capacity, i.e. 28.92 g/g and 1040.08 g/g, for unsaponified and saponified copolymer, repectively. This was obtained from copolymer composed of 25% onggok, 75% acrylamide, 25 mg N,N’-methylenebisacrylamide, and 250 mg ammonium persulfate. The occurrence of grafting cross-linking copolymer was confirmed by fourier transformed infrared spectra, where it was found to exhibit all characteristic bands of both polysaccharide fractions of onggok and acrylamides units.
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Judul: Sintesis Superabsorben melalui Kopolimerisasi Pencangkokan Akrilamida pada Onggok Dialdehida
Abstrak: Cassava waste pulp (onggok) from the tapioca industry is abundant in Indonesia. Cassava waste pulp still has relatively high carbohydrate content, mainly starch and glucose, which is potencial to be utilized as superabsorbent raw material. The goal of this work was to synthesize superabsorbent material from cassava waste pulp through oxidation followed by graft copolymerization. The oxidation was carried out with sodium periodate (NaIO4) to break the C2-C3 bond in the glucose ring. Various concentration of NaIO4 solution (0.01, 0.05, and 0.10 M), oxidation time (15 and 60 min), and washing solutions (distilled water, methanol, and acetone) were used to obtain the optimum aldehyde group amount (the optimum C2-C3 bond cleavage) and the best products resistance against microbes. Optimum oxidation were by conditions using 0.05 M NaIO4 in 1 hour and washed with acetone. Graft copolymerization process was performed by using acrylamide, methylene-bis-acrylamide, and ammonium persulfate. The copolymerization products were then saponified to increase the water absorption capacity. The test result showed that the superabsorbent could swell up to 400 times of their original weight in distilled water. However, the capacities were decreased in salt solution as well as in acid and basic solutions.
Keyword: acrylamide, copolymerization, onggok, oxidation, superabsorbent

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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