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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
Volume 41, Issue 12, Pages 7510-7511Publisher
INST PURE APPLIED PHYSICS
DOI: 10.1143/JJAP.41.7510
Keywords
deoxyribonucleic acid (DNA); scanning tunneling microscopy (STM); Cu(111); pulse injection; poly(dA-dT)-poly(dA-dT); poly(dG-dC)-poly(dG-dC); high-resolution analysis
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We have obtained high-resolution scanning tunneling microscopy (STM) images of poly(dA-dT)-poly(dA-dT) and poly(dG-dC)-poly(dG-dC) adsorbed on Cu(111) substrates. STM revealed that the two deoxyribonucleic acid molecules have different adsorbed structures and topographic heights. We concluded that the observed structural differences originate from the inherent differences in the stability of the adenine-thymine (A-T) and guanine-cytosine (G-C) base pairs.
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