Judul: Aktivitas antijerawat formula campuran meniran dan temu lawak serta aktivitas inhibisinya terhadap katalase Staphylococcus aureus
Abstrak: Acne is an inflammation of skin caused by Staphylococcus aureus, S. epidermidis, and Propionibacterium acnes bacteria. Antiacne activity of temu lawak and meniran has been analyzed through antibacterial activities against S. aureus and S. epidermidis and inhibition of S. aureus catalase activity. Temu lawak and meniran were extracted by using maceration technique in 96% ethanol with two different maceration methods, Indonesian and traditional chinese medicine. S. aureus and S. epidermidis were successfully isolated. The growth of S. aureus was inhibited by temu lawak extract with minimum bactericidal concentration (MBC) 150 ppm and inhibition zone index 0.38. The growth of S. epidermidis was inhibited by mixture of temu lawak 2/3 and meniran 1/6 with MBC 300 ppm and inhibition zone index 0.40. Thin layer chromatography profile of both extracts showed curcuminoid band. Catalase enzyme was successfully isolated from S. aureus. Mixture of temulawak 2/3 and meniran 1/6 gave the best catalase inhibition activity, 6.88% in 500 ppm formula concentration.
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Judul: Aktivitas antijerawat formula campuran temu lawak dan meniran serta penentuan sidik jari kromatografinya
Abstrak: Anti-acne activity of extracts from C. xanthorriza and P. niruri has been analyzed through antioxidant and antibacterial activity assays. Extraction process was conducted by two different maceration methods, Indonesian and traditional chinese medicine (TCM) with ethanol 96% as the solvent. Formula 6 (2/3 C. xanthorriza:1/6 P. niruri:1/6 starch) was the most active anti-acne formula with IC50 of antioxidant values of 93.17 ppm, the minimum inhibitory concentration against Staphylococcus epidermidis was 0.25 mg/mL, and the minimum bactericidal concentration was 0.50 mg/mL. Moreover, TCM maceration was better than the Indonesian method in terms of antioxidant and antibacterial activities. Fingerprint analysis of formula was undertaken using thin layer chromatography. The optimum mobile phase was chloroform that gave 9 bands. Further, the (HPLC) analysis with C18 as column and gradient of acetonitrile and water as the mobile phase showed that the peak area of phyllanthin and curcumin increased when the standard compounds were added into the sample.
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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