Judul: Aktivitas Larvasida Ekstrak Bintaro (Cerbera manghas) Terhadap Larva Nyamuk Aedes aegypti (Diptera: Culicidae)
Abstrak: Dengue is a very dangerous disease and contagious because it causes deadth at short time on the patient. This desease was caused by dengue virus which was infected by Aedes aegypti. Plants have potency to develop as larvacide because itself containts chemical compound which have bioactive. Bintaro (Cerbera manghas) have been known as poisonous tree. The aim of this research is to know the activity of bintaro extract to larvae Ae. aegypti. First, we extracted a leaf, steam bark, kernel and rind of bintaro. Then the best extract was fracinated, after that it was done chromatography colom step. Futhermore, we did bioassay to larvae Ae. aegypti for every step. The result showed that kernel of bintaro have highest activity to mortality of larvae Ae. aegypti than steam bark, rind, and leaf; with LC50 517,3 ppm dan LC90 964,8 ppm. Ethyl acetate fraction have great activity to mortality of Ae. aegypti than n-hexane dan nonsoluble fraction with LC50 34,6 ppm dan LC90 95,1 ppm. We had 10 sub fractions in this research and the sub fraction 1, 7 and 10 had most toxic compound to Ae. aegypti than the others. The kernel extract contains saponim, alkaloid, flavonoid, triterfenoid glikosida and steroid.
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Judul: Biolarvasida Berbahan Dasar Ekstrak dan Serbuk Limbah Kayu Jati (Tectona grandis L.f) terhadap Aedes aegypti
Abstrak: Dengue fever is a disease which is transmited to human by Aedes aegypti. The vector extermination is expected to prevent the spread out of the disease. Tectoquinone is a chemical component of teak wood extractives which has larvicidal activity. The objective of this research was to examine the effectivity of teak wood extract and meal as biolarvicidal against fourth-instar larvae of A. aegypti. The results showed that teak wood extract and meal were effectively play as a biolarvicide against A. aegypti larvae. Based on this research, LC50 and LC90 of extract containing active compound 2-methylanthraquinone were 7.99 μg/ml and 11.87 μg/ml, respectively. It was also found that LC50 and LC90 of wood meal were 849.30 μg/ml and 1,051.10 μg/ml, respectively. It seems that teak wood extract was more toxic rather than wood meal
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Judul: Konstruksi Persamaan Friedmann Alam Semesta Friedmann-Lemaitre-Robertson-Walker Termodifikasi Materi Gelap Superfluida
Abstrak: Kosmologi merupakan salah satu objek kajian dari teori relativitas umum. Salah satu model dalam kosmologi adalah model kosmologi Friedmann. Model kosmologi Friedmann dibangun berdasarkan asumsi bahwa materi dan energi terdistribusi secara homogen dan isotropik di alam semesta. Teori relativitas umum dapat dimodifikasi melalui pendekatan teori materi gelap superfluida (MGS). Persamaan medan Einstein untuk teori MGS dapat dirumuskan melalui prinsip aksi dengan memodifikasi Lagrangian pada aksi teori MGS. Selanjutnya dengan memilih metrik Friedmann-Lemaitre-Robertson-Walker (FLRW) datar dengan indeks kurvatur sama dengan nol, dapat dibangun suatu bentuk persamaan Friedmann yang dimodifikasi teori MGS.
Keyword: kosmologi, teori materi gelap superfluida, persamaan medan Einstein, metrik FLRW, persamaan Friedmann.