期刊
JOURNAL OF CHEMICAL PHYSICS
卷 129, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3001585
关键词
ab initio calculations; biochemistry; density functional theory; DNA; ground states; molecular biophysics; molecular configurations; scanning tunnelling microscopy
资金
- EPSRC [GR/P01427/01, GR/S15808/01]
- EU
- Danish Ministry for Science, Technology and Innovation through the iNANO Center
- Danish Research Councils
- Danish National Research Foundation
- Carlsberg Foundation
- EPSRC
- Engineering and Physical Sciences Research Council [GR/S15808/01] Funding Source: researchfish
Using ultrahigh vacuum scanning tunneling microscopy (STM) and ab initio density functional theory, we have investigated in detail structures formed by cytosine on the Au(111) surface in clean ultrahigh vacuum conditions. In spite of the fact that the ground state of this DNA base on the surface is shown to be an ordered arrangement of cytosine one-dimensional branches (filaments), this structure has never been observed in our STM experiments. Instead, disordered structures are observed, which can be explained by only a few elementary structural motifs: filaments, five- and sixfold rings, which randomly interconnect with each other forming bent chains, T junctions, and nanocages. The latter may have trapped smaller structures inside. The formation of such an unusual assembly is explained by simple kinetic arguments as a liquid-glass transition.
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