1.
Phys Rev Lett
; 105(8): 088101, 2010 Aug 20.
Article
in English
| MEDLINE
| ID: mdl-20868131
ABSTRACT
Stained end-grafted DNA molecules about 20 µm long are scraped away and stretched out by the spreading front of a bioadhesive vesicle. Tethered biotin ligands bind the vesicle bilayer to a streptavidin substrate, stapling the DNAs into frozen confinement paths. Image analysis of the stapled DNA gives access, within optical resolution, to the local stretching values of individual DNA molecules swept by the spreading front, and provides evidence of self-entanglements.