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中文摘要：
在扫描隧道显微镜（STM）模式下观测了单根Ag-DNA的细部形貌,发现单根Ag-DNA出现解链并伴有部分碱基呈现混沌现象.测量了梳直在金薄膜电极表面的Ag-DNA及小牛胸腺DNA的电流-电压（I-V）特性曲线,结果表明Ag-DNA束的横向导电能力比纯DNA弱.
英文摘要：
The current-voltage （I-V） property of Ag-DNA and calf thymus DNA is measured by atomic force microscopy （AFM）. It is found that the ability of electron transport of Ag-DNA is lower than the natural DNA. To explain the phenomenon, the image of single Ag-DNA is presented by Scanning tunneling microscopy （STM）. It shows that Ag-DNA is melting and being chaos in part. The result suggest binding of Ag^＋ cause a change in the conformation of calf thymus DNA.
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