Judul: Identifikasi Senyawa Aktif Tanaman Kamandrah (Croton tiglium) dan Biji Jarak pagar (Jatropha curcas) sebagai Larvasida Nabati Vektor Demam Berdarah Dengue
Abstrak: Telah dilakukan uji potensi larvasida nyamuk Aedes aegypti terhadap ekstrak air dan etanol dari daun kamandrah (Croton tiglium), batang kamandrah, biji kamandrah dan biji jarak pagar (Jatropha curcas), serta minyak kamandrah dan minyak jarak pagar. Ekstrak yang paling berpotensi diidentifikasi kandungan kimianya. Minyak kamandrah lebih berpotensi sebagai larvasida Aedes aegypti instar ke tiga di bandingkan dengan minyak jarak pagar, karena nilai LC50 minyak kamandrah lebih kecil dibandingkan dengan minyak jarak pagar. Nilai LC50 minyak kamandrah sebesar 769 ppm untuk 24 jam pengujian dan 384 ppm untuk 48 jam pengujian, sedangkan nilai LC50 minyak jarak pagar sebesar 1507 ppm untuk 24 jam pengujian dan 866 ppm untuk 48 jam pengujian. Ekstrak air dan etanol dari biji jarak pagar, daun kamandrah, batang kamandrah dan biji kamandrah tidak berpotensi sebagai larvasida. Identifikasi kandungan kimia dilakukan pada minyak kamandrah dan minyak jarak pagar dengan menggunakan GC-MS. Hasil analisa GC-MS diduga minyak kamandrah dan jarak pagar mengandung senyawa piperine dengan kemiripan library sebesar 83%-88%. Senyawa piperine adalah golongan alkaloid jenis piperidin yang biasa digunakan sebagai larvasida untuk nyamuk. Minyak kamandrah dan minyak jarak pagar dapat dikembangkan menjadi larvasida alami untuk mengontrol populasi nyamuk.
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Judul: Efektivitas Minyak Biji Kamandrah (Croton tiglium) Dan Jarak Pagar (Jatropha curcas) Sebagai Larvasida, Anti- Oviposisi Dan Ovisida Nyamuk Aedes aegypti Dan Aedes albopictus
Abstrak: Aedes aegypti and A. albopictus mosquito is increasing problem of public health, being the vector responsible for dengue and chikungunya. Various effort have been done to control the mosquitoes both chemically and naturally. Croton tiglium and Jatropha curcas seed oil were known to posses insecticide activity against larval mosquito species. The study was aimed to examine effectiveness of C. tiglium seed oil and J. curcas seed oil as larvicidal, anti-oviposition, and ovicidal against A. aegypti and A. albopictus, and quantitative analysis of piperine achieved by spectrophotometer. C. tiglium seed oil possessed a significantly higher larvicidal activity against the 3th-4th instar larvae of A. aegypti and A. albopictus than J. curcas seed oil. The larval mortality was observed after 24 h of exposure. The LC50 value of C. tiglium seed oil and J. curcas seed oil were 769.52 ppm and 1366.07 ppm respectively, against A. aegypti and 707.78 ppm and 905.29 ppm respectively, against A. albopictus. There was a decrease in the number of eggs laid by A. aegypti and A. albopictus with C. tiglium and J. curcas oil (≤ 5% eggs) if compared to control (> 50% eggs). C. tiglium and J. curcas seed oil was effective on 0.4%-0.5% concentration so that could prevent the eggs from being hatched (> 90%). Quantitative analysis of C. tiglium and J. curcas by spectrophotometer revealed the presence of piperine were 0.0385% and 0.0054%. The content of C. tiglium was higher compared to J. curcas as proved by the value of LC50. The result of this study suggested that the C. tiglium and J. curcas oil posses insecticide properties that could be developed and used as natural insecticide for larval mosquito control.
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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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