期刊
PHYSICAL REVIEW LETTERS
卷 97, 期 13, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.97.138101
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The behavior of a single collapsed polymer under shear flow is examined using hydrodynamic simulations and scaling arguments. Below a threshold shear rate gamma(*), the chain remains collapsed and only deforms slightly, while above gamma(*) the globule exhibits unfolding/refolding cycles. Hydrodynamics are crucial: In the free draining case, gamma(*) scales with the globule radius R as gamma(*)similar to R-1, while in the presence of hydrodynamic interactions gamma(*)similar to R. Experiments on the globular von Willebrand protein confirm the presence of an unfolding transition at a well-defined critical shear rate.
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