Judul: Komposisi Kimia dan Aktivitas Larvasida Aedes aegypti Minyak Kayu Putih dari Berbagai Sentra Produksi di Indonesia
Abstrak: The objective of this research was to analyze the chemical composition of cajuputi oil from various production centers and examine the activities of cajuputi oil from various production centers as the Aedes aegypti mosquito larvicides. The essential oils of cajuputi were tested at 0; 62.5; 125; 250; 500; and 1000 μg/mL concentrations against the third instar larvae of Aedes aegypti. Larval mortalities, LC50 values were observed after 24 hours of exposure. This experiment showed that the cajuput oil from Pasuruan-East Java was found with the highest LC50 followed consecutively by Gundih, Dlingo, Gelaran, Indramayu and Buru island. Based on phytochemical analysis, major compounds identified in the cajuput oil were α-terpinene, α-pinene, β-pinene, γ-pinene, cineole, α-terpinolene, terpineol, caryophyllene, α-humulene, α-muurolene, α-selinene and α-terpinenyl acetat. Larvicidal activity of the oil was brought about by the presence of α-terpinene, terpinolene and γ-terpinene.
Keyword: larvicidal activity, cajuput oil, Aedes aegypti

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: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik.
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik