Judul: Biodegradasi Oksidatif Styrofoam oleh Kapang Pelapuk Putih dan Bakteri.
Abstrak: Limbah styrofoam tersusun atas banyak monomer stirena yang mengalami polimerisasi. Sejauh ini penelitian dalam biodegradasi styrofoam hanya pada bakteri Pseudomonas sp.. Enzim ligninolitik berasal dari kapang pelapuk putih berpotensi dalam mendegradasi styrofoam. Kapang pelapuk putih yang digunakan adalah NG007, WM01, dan BIOM3. Bakteri yang digunakan Pseudomonas aeruginosa, Serratia marcescens, dan Basillus subtilis. Tujuan dari penelitian ini adalah menemukan galur kapang pelapuk putih dan bakteri yang paling resistan, dan mampu dalam mendegradasi styrofoam dengan baik. Tingkat resistensi terhadap styrofoam adalah kapang NG007 (Pestalotiopsis sp.) dan bakteri Pseudomonas aeruginosa setelah inkubasi 7 hari, dengan suhu ±25℃. Degradasi larutan styrofoam pada media cair kapang NG007 sebesar 74.43 % dan bakteri Pseudomonas aeruginosa sebesar 63.43 % yang paling mampu dalam mendegradasi styrofoam setelah inkubasi 30 hari, dengan suhu ±25℃. Bakteri Pseudomonas aeruginosa dan kapang NG007 (Pestalotiopsis sp.) hasil SEM menunjukkan adanya perubahan struktur lapisan berupa pembesaran lubanglubang pada rongga styrofoam setelah inkubasi 30 hari, dengan suhu ±25℃.
Keyword: enzim ligninolitik, NG007, Pseudomonas aeruginosa, styrofoam

Judul: Characterization and Biodegradation of Polyblend (Styrofoam-Starch) with Polylactid acid (PLA) as Biocompatizer.
Abstrak: Styrofoam is a kind of polystyrene which can not be naturally decomposed. The increasing amount of using styrofoam causes environment pollution. In facing this problem, modification of recyclable styrofoam is needed to produce degradable plastic. Starch can be a solution because it is a polymer that can be biologically decomposed. The mixture of starch to the styrofoam composite creates biodegradable plastic. Unfortunately, various polarity of styrofoam and starch is difficult to mixed homogenously, so we need polylactic acid (PLA) as the biocompatizer. Styrofoam and starch of four different concentrations of PLA, 5, 10, 15, and 20%. Film with the highest homogeneity was given by 80:20 concentration of styrofoam and starch combination with 20 % of PLA addition. The more PLA, the more homogenous of film we got. Film with the highest homogeneity produced substantial weight reduction which about 10%. The film that has been produced was amorphous since it had wide melting point, 155 °C to 185 °C. Infrared spectrum film showed the existence of C-O ester on 1184 cm-1 region. Ester functional group indicated that the film could be biodegraded. The infrared spectrum of the film did not show new functional groups, so we concluded that the film was a product of physical mixture between styrofoam and starch.
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Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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