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Octaminomycins A and B, Cyclic Octadepsipeptides Active against <i>Plasmodium falciparum</i>
Jang, Jun-Pil,Nogawa, Toshihiko,Futamura, Yushi,Shimizu, Takeshi,Hashizume, Daisuke,Takahashi, Shunji,Jang, Jae-Hyuk,Ahn, Jong Seog,Osada, Hiroyuki American Chemical Society and American Society of 2017 Journal of natural products Vol.80 No.1
<P>Two new cyclic octadepsipeptides, octaminomycins A (1) and B (2), were isolated from a microbial metabolite fraction library of Streptomyces sp. RK85-270 based on Natural Products Plot screening. Their structures were elucidated on the basis of HRESIMS, 1D and 2D NMR spectroscopic data, and MS/MS experiments for sequence analysis. The absolute configurations of the constituent amino acid residues were determined by a combination of single crystal X-ray diffraction and Marfey's methodology. Notably, octaminomycins A (1) and B (2) showed good in vitro antiplasmodial activity against chloroquine-sensitive as well as chloroquine-resistant strains with no cytotoxicity up to 30 mu M.</P>
Melvin John F. Empizo,Kohei Yamanoi,Kazuhito Fukuda,Ren Arita,Yuki Minami,Toshihiko Shimizu,Nobuhiko Sarukura,Tsuguo Fukuda,Alexandra B. Santos-Putungan,Ray M. Vargas,Arnel A. Salvador,Roland V. Sarma 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Photoluminescence properties of bulk and microstructured ZnO crystals are investigated for potential scintillator applications. A bulk crystal is prepared by hydrothermal method, while hexagonal micron-sized crystals are prepared by aqueous chemical growth and carbothermal reduction methods. The bulk sample exhibits UV emission only, while the microstructured samples exhibit both UV and visible emissions. The ZnO microstructures have faster near-band edge emission lifetimes of 100 to 800 ps compared to 440 ps and 2 ns of bulk ZnO. No direct correlation between the defect-related emissions and the near-band edge emission has been observed. ZnO microstructures with fast luminescence lifetimes have promising applications as EUV lithography and XFELs scintillators.