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Secondary metabolites and their biological activities in Indonesian soft coral of the genus Lobophytum

Asian Pacific Journal of Tropical Biomedicine 2016年第11期6卷 909-913页

作者： Masteria Yunovilsa Putra Tutik Murniasih Respati tri Swasono joko tri wibowo Annissa Nur Cahya Saputri Meilia Rahma Widhiana Irma Shita Arlyza Research Center for Oceanography Indonesian Institute of Sciences Jl.Pasir Putih I Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Gadjah Mada

Objective: To investigate the antioxidant, antibacterial, antimalarial activities and cytotoxicity of the n-hexane, ethyl acetate, n-butanol, and aqueous fractions from a crude extract of Lobophytum ***: This organism was collected from the Selayar Islands(South Sulawesi). The antioxidant activity was performed by the 1,1-diphenyl-2-picryl hydrazyl radical scavenging method. All fractions from the crude extract of Lobophytum sp. were examined for their cytotoxicity using the brine shrimp lethality bioassay and heme polymerization inhibitory activity assay for antimalarial ***: It was found that the ethyl acetate, n-butanol and aqueous fractions exhibited heme polymerization inhibitory activity with IC_(50) values of 11.7, 14.3 and 12.0 mg/m L,respectively, while the n-butanol fraction showed moderate antioxidant activity and cytotoxicity with IC_(50) values of 150.00 and 92.74 mg/m L, ***: This study provides information on antioxidant, antibacterial and antimalarial activities as well as the cytotoxicity of all fractions from the crude extract of Lobophytum sp. This is a new report of antimalarial substances derived from Lobophytum sp.

关键词： Ocean Indonesia Natural products Biological activities

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Indonesia’s Local Material Effect in Clay-Based Ceramic Filter Fabrication as an Alternative for Liquid Radioactive Waste Processing Material

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Materials Sciences and Applications 2016年第7期7卷 371-379页

作者： Widya Rosita Ferdiansjah Antonius Wisnu Yogha Pamungkas tri joko Prihatin Department of Engineering Physics Universitas Gadjah Mada Yogyakarta Indonesia

One of the procedures to handle liquid radioactive waste is by filtration process. To do this process, suitable filter should be used because of radioactive nature of the waste. Ceramic filter is one of the suitable filters that could be used for this purpose. This paper will discuss about producing ceramic filter from local clay and test its performance. Performance of the filter is given by its flux, compressive strength, Decontamination Factor (DF) and adsorption efficiency. The results show that there are almost no effects of casting pressure on both flux and compressive strength of ceramic filter, but zeolite addition produces different effect. The higher concentration of zeolite will decrease the filter flux and increase filter compressive strength. The optimal composition from this research is 70% w/o clay-25% w/o zeolite-5% w/o charcoal. It has adsorption efficiency (60.36) and Decontamination Factor (2.52). Besides, Sr concentration after filtration is still higher than environmental standard for Sr-90 and more studies are still needed.

关键词： Local Clay Zeolite Charcoal Filter Radioactive Waste

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