2000
Imaging of DNA molecules by scanning near-field microscope
Materials Science and Engineering C
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- Volume
- 12
- Number
- 1
- First page
- 29
- Last page
- 32
- Language
- English
- Publishing type
- DOI
- 10.1016/S0928-4931(00)00153-3
- Publisher
- Elsevier Sequoia SA
We utilized a novel scanning near-field optical microscope (SNOM) for imaging DNA molecules. The microscope system was constructed with a commercial inverse microscope and a newly developed scanning unit. In the system, a bent optical fiber probe is used to operate in a dynamic mode atomic-force microscope (AFM). A λDNA solution of 5 μM (base) with 5 μM and 500 nM YOYO-1 was prepared and cast on a γ-APTES treated cover slip. The λDNA was aggregated in line and immobilized on the cover slip. The percentage of fluorescence intensity of λDNA with 5 μM YOYO-1 showed integers at almost each point on the DNA. As the fluorescence intensity correlated with the areas of a cross-section of the DNA topography, it appeared that YOYO-1 intercalated in the DNA homogeneously. The fluorescence images of λDNA with 500 nM YOYO-1, however, were irregular and did not correlate with the area of the topographic cross-section, suggesting that YOYO-1 did not intercalate in the λDNA uniformly in this concentration and intercalated cooperatively.
- Link information
- ID information
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- DOI : 10.1016/S0928-4931(00)00153-3
- ISSN : 0928-4931
- SCOPUS ID : 0034246534