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采用四甲基偶氮唑蓝比色法(MTT法),考察了两亲性α-四(对-羧基苯氧基)酞菁锌(Ⅱ)光敏剂对Bel-7402人体肝癌细胞的离体光动力学行为,研究了浓度和光照时间对光灭活作用的影响.结果发现:在适宜的浓度下,酞菁锌光敏剂表现出了良好的抑制作用,且此抑制过程遵循一级反应的动力学规律.另外,酞菁在光催化下产生的单重态氧能损坏癌变的细胞膜,导致靶对细胞的死亡. 相似文献
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Radio-Frequency Characteristics of the Coaxial Step-Disk-Loaded Slow-Wave Structure for Relativistic Travelling Wave Tubes 下载免费PDF全文
We present a new periodic all-metal slow wave structure, a coaxial step-disc-loaded system and the dispersion characteristics of the structure. By using the field-matching method, the dispersion equation and the coupling impedance of this structure are obtained. The coaxial structure makes the bandwidth broader than that of the non-coaxial one. Compared with the coaxial disc-loaded and ridged-disc-loaded structures, the pass-band of coaxial step-disc-loaded structure is the broadest. The calculation results show that increasing the step width and decreasing the step thickness can improve the bandwidth. 相似文献
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