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9 papers · 1 filter
Crosslinked networks of stiff filaments exhibit negative normal stress
Enrico Conti, F. C. MacKintosh
Motivated by recent experiments showing that stiff biopolymer gels exhibit highly unusual negative normal elastic stresses, we develop a computational model for stiff polymer netwo…
Short-time inertial response of viscoelastic fluids measured with Brownian motion and with active probes
M. Atakhorrami, D. Mizuno, G. H. Koenderink +3
We have directly observed short-time stress propagation in viscoelastic fluids using two optically trapped particles and a fast interferometric particle-tracking technique. We have…
High-bandwidth viscoelastic properties of aging colloidal glasses and gels
S. Jabbari-Farouji, M. Atakhorram, D. Mizuno +5
We report measurements of the frequency-dependent shear moduli of aging colloidal systems that evolve from a purely low-viscosity liquid to a predominantly elastic glass or gel. Us…
Nonlinear elasticity of composite networks of stiff biopolymers with flexible linkers
C. P. Broedersz, C. Storm, F. C. MacKintosh
Motivated by recent experiments showing nonlinear elasticity of in vitro networks of the biopolymer actin cross-linked with filamin, we present an effective medium theory of flexib…
Non-equilibrium microtubule fluctuations in a model cytoskeleton
C. P. Brangwynne, G. H. Koenderink, F. C. MacKintosh +1
Biological activity gives rise to non-equilibrium fluctuations in the cytoplasm of cells; however, there are few methods to directly measure these fluctuations. Using a reconstitut…
Buckling and force propagation along intracellular microtubules
Moumita Das, Alex J. Levine, F. C. MacKintosh
Motivated by recent experiments showing the buckling of microtubules in cells, we study theoretically the mechanical response of, and force propagation along elastic filaments embe…