Apr 30, 2017

Nonlinear Rheology in a Model Biological Tissue

Physical Review Letters
D A Matoz-FernandezKirsten Martens

Abstract

The rheological response of dense active matter is a topic of fundamental importance for many processes in nature such as the mechanics of biological tissues. One prominent way to probe mechanical properties of tissues is to study their response to externally applied forces. Using a particle-based model featuring random apoptosis and environment-dependent division rates, we evidence a crossover from linear flow to a shear-thinning regime with an increasing shear rate. To rationalize this nonlinear flow we derive a theoretical mean-field scenario that accounts for the interplay of mechanical and active noise in local stresses. These noises are, respectively, generated by the elastic response of the cell matrix to cell rearrangements and by the internal activity.

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Mentioned in this Paper

Stress, Mechanical
Environment
Nonlinear Dynamics
Viscosity
Apoptosis
Biological Tissue
Local
Flowmetry
Thinning Weight Loss
Cytoplasmic Matrix

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