Abstract
We report on the electrical manipulation of single- and double-stranded oligodeoxynucleotides that are end tethered to gold surfaces in electrolyte solution. The response to alternating repulsive and attractive electric surface fields is studied by time-resolved fluorescence measurements, revealing markedly distinct dynamics for the flexible single-stranded and stiff double-stranded DNA, respectively. Hydrodynamic simulations rationalize this finding and disclose two different kinetic mechanisms: stiff polymers undergo rotation around the anchoring pivot point; flexible polymers, on the other hand, are pulled onto the attracting surface segment by segment.
Original language | English |
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Pages (from-to) | 3666-3671 |
Number of pages | 6 |
Journal | Biophysical Journal |
Volume | 90 |
Issue number | 10 |
DOIs | |
State | Published - May 2006 |