AI Article Synopsis
- This research highlights the limitations of using ensemble averages to understand the behavior of entangled macromolecules, particularly in non-equilibrium conditions.
- By employing single-molecule fluorescence imaging in a homebuilt rheo-microscope, the study tracks the alignment and stretching of filamentous actin under varying shear rates.
- The findings reveal that as shear rate increases, the material first softens due to molecular alignment, then hardens due to stretching, even in biopolymers shorter than their persistence length.
Article Abstract
It is unsatisfactory that regarding the problem of entangled macromolecules driven out of equilibrium, experimentally based understanding is usually inferred from the ensemble average of polydisperse samples. Here, confronting with single-molecule imaging this common but poorly understood situation, over a wide range of shear rate we use single-molecule fluorescence imaging to track alignment and stretching of entangled aqueous filamentous actin filaments in a homebuilt rheo-microscope. With increasing shear rate, tube "softening" is followed by "hardening." Physically, this means that dynamical localization first weakens from molecular alignment, then strengthens from filament stretching, even for semiflexible biopolymers shorter than their persistence length.
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| http://dx.doi.org/10.1103/PhysRevLett.129.147801 | DOI Listing |
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