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New Defect Control for Extremely Long-Lived Widegap-White Light Emitting Diodes
K. Ando,Y. Hashimoto,K. Kanzaki,S. Ohashi,Y. Morita,T. Abe,H. Kasada,M. Adachi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
A new current pulse-width control for long-lived ZnSe-white LEDs is presented. Using the defect controlling technique together with high quality ZnSe white LED, it is proved that bright ZnSe white LEDs have exhibited long device life-time exceeding 20000 hrs for its in practical use. It is also evidenced that the present current pulse-width control is not limited in the ZnSe system, but very effective for other widegap semiconductor bright and long-live light emitting devices of GaN and ZnO.
Bioassay-guided Isolation of Deoxypodophyllotoxin , the Cytotoxic Constituent of Juniperus chinensis
A. M. Ali,I. Intan Safinar,M. M. Mackeen,S. H. El Sharkawy,K. Takahata,H. Kanzaki,K. Kawazu 한국생약학회 1998 Natural Product Sciences Vol.4 No.3
The ethanol extract from the leaves of Juniperus chinensis was found to be cytcrtoxic towards HeLa cells. Bioassay-guided fractionation of the EtOAc soluble faction directed by the microtitration cytotoxic assay revealed that the cytotoxic comported was deoxypodophyllotoxin. All the tumour cell lines tested (KU8112F-chronic mylogeneous leukemia, TK 10-renal carcinoma, UACC 62-melanoma and (CEM-SS-T-lymphoblastic leukemia) were found to be susceptible to deoxypodaphyllotoxin, however, floe minimum effective concentration (MEC) required to reduce the cell population by 100 percent was different between cell lines.