Judul: Aktivitas Antifungi Ekstrak Daun Sirih Hijau (Piper betle L.) Terhadap Candida tropicalis
Abstrak: Betel leaf (Piper betle L.) is a medicinal plant that is widely used in treating various diseases, including vaginal candidiasis. One of the causes of this disease is Candida tropicalis. The aim of this study was to decide the effective concentration of the green betel leaf extract (Piper betle L.) as an anti-candidiasis (in vitro) against Candida tropicalis. Optimization of the effective concentration used the well diffusion method and analysis of the compounds used GC-MS. Green betel leaves were extracted using three solvents : water, ethanol 70%, and acetone. The percentage yield of acetone extract was greater than the water and the ethanol extracts, that was 19.64 %. From the result of phytochemical analysis, it was known that the acetone extract contains saponins, tannins, triterpenoids and steroids. Antibacterial activity test showed that all extracts have inhibitory effect on Candida tropicalis. Based on research data, acetone extract at 6.25 mg/mL is chosen as the effective concentration. The chemical components of green betel leaf acetone extract that have potential as anti-Candida tropicalis were benzoic acid; 2-hexadecen-1-ol, 3,7,11,15-tetramethyl and neophytadiene.
Keyword: Anti-candidiasis, Candida tropicalis, Piper betle L.

Judul: Aktivitas Ekstrak Daun Miana (Coleus scuttellarioides [L] Benth) Sebagai Antifungi Candida tropicalis
Abstrak: Candidiasis is an infection caused by yeast of Candida tropicalis. One of the leaves thought to contain anti microbial is (Coleus scutellarioides [L] Benth) leaves. The aim of this study is to test the activity of the leaf extract (Coleus scutellarioides [L] Benth) as an antifungal Candida tropicalis in vitro. This using diffusion wells and growth methods. Extracts tested are aquades extract, 70% ethanol extract and acetone extract of leaves miana. The extract can inhibit the growth of Candida tropicalis is miana leaf acetone extract. Minimum Inhibitory Concentration acetone extract solvent is DMSO and acetone, respectively at 25 mg/mL with inhibition zone diameter 1.55 mm and 1.50 mm.The results of statistical tests with SPSS 16.0 software showed that acetone extract of the (Coleus scutellarioides [L] Benth) leaves can significantly inhibit the growth of Candida tropicalis (ANOVA α 0.05) although its inhibition zone diameter is less than Nystatin. Acetone extract was analyzed by GC-MS and have the dominant content of the compound is 2-hexadecen-1-ol, 3, 7, 11, 15-tetramethyl-, [R-[R*, R*- (E)]] – (CAS) phytol and neophytadiene.
Keyword: extract (Coleus scutellarioides [L] Benth), C. tropicalis, antimicrobial

Judul: Dinamika Sistem Ekonomi dengan Model Overlapping-Generation
Abstrak: This manuscript describes a modern macroeconomic model in discrete time so-called Overlapping-Generation Model. In general, modeling framework of Overlapping-Generation is assumed that each person lives for only two periods, i.e. he/she works in the first period and retires in the second. By maximizing lifetime utility, which depends on consumption in the two periods of life, there will exist a steady state condition. Steady state happens when capital per capita at the first and the second periods are equal. In the end, economics converges to a steady state. Some numerical simulations show the effects of some parameters to the steady state condition.
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