2-DIMENSIONAL ORDERING OF THE DNA-BASE GUANINE OBSERVED BY SCANNING TUNNELING MICROSCOPY

被引:137
作者
HECKL, WM
SMITH, DPE
BINNIG, G
KLAGGES, H
HANSCH, TW
MADDOCKS, J
机构
[1] IBM CORP,PHYS GRP,W-8000 MUNICH 40,GERMANY
[2] UNIV SHEFFIELD,DEPT THERAPEUT,SHEFFIELD S10 2JF,S YORKSHIRE,ENGLAND
关键词
D O I
10.1073/pnas.88.18.8003
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Guanine, one of the four DNA bases, has been observed by tunneling microscopy to form a two-dimensional ordered structure on two crystalline substrates, graphite and MoS2. The two-dimensional lattice formed by guanine is nearly identical on the two surfaces, and heteroepitaxy appears to be the growth mechanism in both cases. Although the resolution of molecular details is superior for the graphite substrate, the simpler results on MoS2 are not only easier to interpret but also facilitate the understanding of the more complex images on graphite. We propose that the interfacial structure is composed of linear chains of hydrogen-bonded molecules aligned into a closely packed two-dimensional array.
引用
收藏
页码:8003 / 8005
页数:3
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