Judul: The Activity of Microalgae Extract to RNA Helicase Inhibitor Japanese Encephalitis Virus
Abstrak: Japanese encephalitis virus is an agent of encephalitis disease. Cellular target therapy is one of the ways to prevent japanese encephalitis virus which has been recently developed. Microalgae extract assesment is potential to inhibit japanese encephalitis virus through inhibition of NS3 helicase. Microalgae were taken from Batam, Pari, and Ciater. Each microalgae has been extracted by four solvents (methanol 80%, acetone 80%, hexane 80%, and etyl acetate 80%) to produce 101 extracts. The ATPase assay was used on inhibition activity of the extracts, whereas for the toxicity method done is Brine Shrimp Lethality Test. The results showed that five microalgae extracts have a high inhibition activity which are CTR 07-09 etyl acetate 80% (97,19331%), CTR 07-10 etyl acetate 80% (95,61652%), CTR 07-01 etyl acetate 80% (95,1661%), CTR 06-08 etyl acetate 80% (94,54431%), and CTR 07-07 etyl acetate 80% (94,22955%). Then the five of microalgae extracts were tested with the toxicity test to calculate LC50 value. Microalgae extract of CTR 06-08, CTR 07-09, and CTR 07-10 have a character of non-toxic, whereas microalgae extract of CTR 07-01 and CTR 07-07 have a character of toxic.
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Judul: Isolasi dan pemurnian bahan aktif dari mikroalga BTM 11 sebagai inhibitor RNA helikase virus hepatitis C
Abstrak: Hepatitis C virus is the cause of hepatitis C disease which has high virulence. Recent therapy using combination of ribavirin and alpha interferon has short efficiency < 80%. Thus, the discovery of new drug is needed. Antiviral drugs can be discovered through molecular target therapy by finding the inhibitor of RNA helicase that play role in viral replication. Inhibitor can be derived from chemical compound produced by microalgae. The aim of this research was to isolate the active compound from microalgae BTM 11 which had inhibitory activity against RNA helicase. Inhibitory activity was measured by releasing of phospate inorganic in colorimetric ATPase assay. Crude extract was fractionated using gel filtration chromatography with methanol in chloroform solvent. The result showed that Fraction 3 has the highest inhibitory activity which (81.205%). Phytochemical test of crude extract indicated positive flavonoids and coumarin. Thin layer chromatography (TLC) analysis with eluent chloroform: methanol gave 2 spots with Rf value of 0.8 and 0.37. Moreover, high performance liquid chromatography (HPLC) analysis showed absorption peak with the highest abundance at the retention time of 12.483 minute and 16.617 minute was 266 nm and 230 nm. According to these of phytochemical, TLC, and HPLC, inhibitor compound from BTM 11 belongs to flavonoids.
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Judul: berjudul Pelabelan Prima pada Graf Gurita (On) dengan Penambahan Simpul Duplikasi.
Abstrak: Setiap graf gurita adalah graf prima sedemikian sehingga pelabelan simpul pada graf gurita merupakan pelabelan simpul pada graf prima. Suatu Graf ( ( ) ( )) dapat dikatakan memiliki pelabelan simpul pada graf prima jika graf tersebut memenuhi fungsi bijektif ( ) { } dan untuk setiap sisi ( ( ) ( )) . Dalam karya ilmiah ini, akan ditunjukkan bahwa graf gurita memiliki pelabelan prima dan merumuskan graf gurita duplikasi dengan penambahan simpul dari simpul graf kipas ( ) graf gurita ( ), graf bintang ( ) graf gurita ( ), dan simpul utama pada graf gurita ( ) adalah graf prima dengan
Keyword: graf gurita, graf prima, pelabelan prima, penambahan simpul