Journal
PHYSICAL REVIEW LETTERS
Volume 99, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.99.126001
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We use optical tweezers to directly measure the intermolecular forces acting on a single polymer imposed by surrounding entangled polymers (115 kbp DNA, 1 mg/ml). A tubelike confining field was measured in accord with the key assumption of reptation models. A time-dependent harmonic potential opposed transverse displacement, in accord with recent simulation findings. A tube radius of 0.8 mu m was determined, close to the predicted value (0.5 mu m). Three relaxation modes (similar to 0.4, 5, and 34 s) were measured following transverse displacement, consistent with predicted relaxation mechanisms.
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