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研究以一种水中稳定性良好的新型二维Zn-MOF配合物为荧光探针来检测水体中金属离子,该固态配合物在水溶液中稳定存在,在512 nm处有强的荧光发射峰。在所研究的11种能使该Zn-MOF配合物荧光信号发生猝灭的金属离子中,Fe~(3+)的荧光猝灭效果最佳,猝灭百分数达90.9%,比荧光猝灭效果次之的Bi~(3+)(猝灭百分数为59.2%)高出30%以上。Fe~(3+)的荧光猝灭系数Ksv=2.51×10~3M~(-1),表明该Zn-MOF配合物是一种性能良好的检测Fe~(3+)的荧光探针。研究结果及其应用对于促进生物系统的稳定和环境保护等方面的研究都具有重要意义。 相似文献
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朱肖一 《武汉工程大学学报》2009,31(4)
从2005年至今考研英语阅读理解部分出现了Part B新题型,在分析新题型的特点和测试难点的基础上,根据韩礼德的衔接理论,提出了4个解题策略.并举例加以阐释.旨在探讨语篇内部衔接手段在解题中的作用,帮助考生熟练掌握这些衔接手段,增强考生的语篇连贯能力,提高考牛的阅读效率和解题技巧. 相似文献
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The aim of this study was to evaluate the effect of the morphology of titanium implant surfaces on dental plaque biofilm formation and the antimicrobial effects of mouthrinses on dental plaque biofilms regarding these titanium surfaces by using an open biofilm model. The average surface roughness(RA) of three types of titanium surfaces(Smooth, hydroxyapatite(HA), sandblast large grit and acid-etching(SLA)) were tested by atomic force microscope(AFM). Subgingival plaques were collected and cultured on titanium surfaces for 4 hours to 2 weeks. After treatment with mouthrinses, characterization of dental plaque biofilms was tested by field-emission SEM(FESEM) and confocal laser scanning microscopy(CLSM). The results of AFM and SEM showed that the surface roughness and biofilm thickness of HA and SLA surfaces were significantly higher than those of smooth surface. In addition, it was revealed that the mouthrinses were effective on the killing of young dental plaque biofilms, while the more mature biofilm(14-day-old) exhibited a stronger resistance to mouthrinses used in this study. In conclusion, the roughness of titanium surfaces can affect the dental plaque biofilm formation and Colgate Plax and Listerine COOL MINT are effective mouthrinses to kill dental plaques at the early stage of biofilm growth on the titanium implant surfaces. 相似文献
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朱肖一 《武汉化工学院学报》2009,31(4):69-73
从2005年至今考研英语阅读理解部分出现了PartB新题型,在分析新题型的特点和测试难点的基础上,根据韩礼德的衔接理论,提出了4个解题策略,并举例加以阐释,旨在探讨语篇内部衔接手段在解题中的作用,帮助考生熟练掌握这些衔接手段,增强考生的语篇连贯能力,提高考生的阅读效率和解题技巧。 相似文献