Judul: Aktivitas antibakteri ekstrak Daun Jawer Kotok (Coleus scutellaroides [L.] Benth.)
Abstrak: Penelitian ini mempelajari aktivitas antibakteri dan Konsentrasi Hambat Tumbuh Minimum (KHTM) dari ekstrak daun jawer kotok terhadap bakteri Gram positif (Staphylococcus aureus & Bacillus subtilis) dan bakteri Gram negatif (Escherchia coli & Pseudomonas aeruginosa), serta penentuan senyawa metabolit pada jawer kotok. Filtrat daun muda dan tua diuji aktivitas antibakterinya. Daun jawer kotok tua secara umum memiliki aktivitas antibakteri yang lebih besar. Daun jawer kotok tua diekstraksi menggunakan tiga pelarut, yaitu heksana, air, dan aseton. Ekstrak daun jawer kotok diuji aktivitas antibakterinya. Ekstrak aseton memiliki zona hambat paling besar terhadap bakteri uji. Ampisilin 0.4 mg/mL digunakan sebagai kontrol positif. Uji kualitatif fitokimia ekstrak aseton menunjukkan hasil positif untuk uji senyawa alkaloid dan steroid. Zona hambat yang dihasilkan memiliki korelasi positif dengan konsentrasi ekstrak daun jawer kotok. Konsentrasi Hambat Tumbuh Minimum ekstrak daun jawer kotok terhadap bakteri B. Subtilis, S. aureus, E. coli, dan P. aeruginosa adalah 0,1 mg/mL dengan zona hambat berturut-turut adalah 6.6438, 6.5, 6.8062, dan 6.6188 mm. Zona hambat ampisilin 0.4 mg/mL terhadap B. subtilis, S. aureus, E. coli, dan P. aeruginosa masing-masing sebesar 26.2, 25.6042, 24.7708, dan 25.5292 mm.
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Judul: Aktivitas Antimikroba Ekstrak Etanol Daun Jawer Kotok (Coleus atropurpureus) Terhadap Bakteri Kulit Wajah Berjerawat.
Abstrak: The misused of antibiotics will resist the bacteria. The increasing of resistance in antibiotic needs exploration other alternative resources which could kill or obstruct bacteria to grow. One of resources is jawer kotok (Coleus atropurpureus) leave. The objectives of this research are to assay jawer kotok leave’s etanol extract as antibacterial for pimpled skin. Those bacteria are Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus sp., and Micrococcus sp.. The bacterias were challenged with gradual extract consentration, starting from 20%, 40%, 60%, 80% and campared with 1% clindamycin antibiotic. The result of the research showed that jawer kotok leave’s etanol extract had potency as good antibacterial. The diameter of antibacterial inhibition zone range from 13.80 ± 1.09 mm until 17,00 ± 0,70 mm. Secondary metabolites in jawer kotok leave consist of flavonoids, polyphenols, tannins and terpenoids which had potency as antibacterial.
Keyword: Coleus atropurpureus, antimicrobial activity, jawer kotok extract, flavonoids, tannin, polyphenols, terpenoids

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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