Oscillatory motion of a droplet in an active poroelastic two-phase model

@article{Kulawiak2018OscillatoryMO,
  title={Oscillatory motion of a droplet in an active poroelastic two-phase model},
  author={Dirk Alexander Kulawiak and Jakob L{\"o}ber and Markus B{\"a}r and Harald Engel},
  journal={Journal of Physics D: Applied Physics},
  year={2018}
}
We investigate flow-driven amoeboid motility as exhibited by microplasmodia of Physarum polycephalum. A poroelastic two-phase model with rigid boundaries is extended to the case of free boundaries and substrate friction. The cytoskeleton is modeled as an active viscoelastic solid permeated by a fluid phase describing the cytosol. A feedback loop between a chemical regulator, active mechanical deformations, and induced flows gives rise to oscillatory and irregular motion accompanied by spatio… 

Figures and Tables from this paper

Active poroelastic two-phase model for the motion of physarum microplasmodia
TLDR
The onset of self-organized motion is studied in a poroelastic two-phase model with free boundaries for Physarum microplasmodia to find moving MPs in extended regions of experimentally accessible parameters, such as length, period and substrate friction strength.
Active Poroelastic Two-Phase Model for the Motion of Physarum Microplasmodia
TLDR
The onset of self-organized motion is studied in a poroelastic two-phase model with free boundaries for Physarum microplasmodia to find moving MPs in extended regions of experimentally accessible parameters, such as length, period and substrate friction strength.
Symmetry breaking transition towards directional locomotion in Physarum microplasmodia
TLDR
Measurements of symmetry breaking and its transition into directional flow-driven amoeboid locomotion in small fragments of Physarum polycephalum show that initiation of locomotion is accompanied by the symmetry breaking of traction stresses and the polarization of ectoplasmic mechanical properties.
Rotating lamellipodium waves in polarizing cells
TLDR
A model showing that the dynamics of these waves can be reproduced with a minimal, well-defined set of parameters is presented and an amplitude equation approach is developed to study multiple competing rotational waves and how they allow the cell to transition from a non-moving state towards a polarized, steady moving state.
Integrated mechanisms of cellular behavior : cell biology and biological physics of the slime mold Physarum polycephalum
TLDR
This thesis demonstrates that the number of mitochondria correlates with the metabolic state of the cell: in the absence of glucose, the slime mold is forced to switch to different metabolic pathways, which occur inside the mitochondria.

References

SHOWING 1-10 OF 67 REFERENCES
An Active Poroelastic Model for Mechanochemical Patterns in Protoplasmic Droplets of Physarum polycephalum
TLDR
A two-dimensional model for the contraction patterns observed in protoplasmic droplets of Physarum polycephalum is derived and analyzed, which reproduces a large variety of wave patterns, including traveling and standing waves, turbulent patterns, rotating spirals and antiphase oscillations.
A model for oscillations and pattern formation in protoplasmic droplets of Physarum polycephalum
Abstract. A mechano-chemical model for the spatiotemporal dynamics of free calcium and the thickness in protoplasmic droplets of the true slime mold Physarum polycephalum is derived starting from a
Mechanochemical pattern formation in simple models of active viscoelastic fluids and solids
The cytoskeleton of the organism Physarum polycephalum is a prominent example of a complex active viscoelastic material wherein stresses induce flows along the organism as a result of the action of
Coordination of contractility, adhesion and flow in migrating Physarum amoebae
TLDR
The results demonstrate that coordination of adhesive forces is essential to producing robust migration and is insensitive to heterogeneity in substrate adhesiveness.
Self-organized mechano-chemical dynamics in amoeboid locomotion of Physarum fragments.
TLDR
This work quantifies the spatio-temporal dynamics of flow-driven amoeboid locomotion in small (~100 µm) fragments of the true slime mold Physarum polycephalum and shows that the convective transport of calcium ions may be key for establishing and maintaining the spatiotemporal patterns of calcium concentration that regulate the generation of contractile forces.
A POROELASTIC MODEL FOR CELL CRAWLING INCLUDING MECHANICAL COUPLING BETWEEN CYTOSKELETAL CONTRACTION AND ACTIN POLYMERIZATION.
TLDR
This work proposes a new hypothesis whereby local cytoskeletal contraction generates fluid flow through the lamellipodium, with the pressure at the front of the cell facilitating actin polymerization which pushes the leading edge forward.
Intracellular mechanochemical waves in an active poroelastic model.
TLDR
It is found that different forms of mechanochemical waves including traveling, standing, and rotating waves are found by employing linear stability analysis and numerical simulations in one and two spatial dimensions.
A free-boundary model of a motile cell explains turning behavior
TLDR
The model analysis shows that the contractile mechanism of motility supports robust cell turning in conditions where short viscosity-adhesion lengths and fast protrusion cause an accumulation of myosin in a small region at the cell rear, destabilizing the axial symmetry of a moving cell.
...
1
2
3
4
5
...