Permeation Instabilities in Active Polar Gels

Area of Science:

• Physics
• Biophysics
• Materials Science

Background:

• Active gels are complex materials with internal stresses.
• Understanding their behavior is crucial for biological processes like cell migration.

Purpose of the Study:

• To present a theoretical framework for active, permeating, polar gels.
• To analyze the stability of these gels and identify novel instability mechanisms.

Main Methods:

• Utilizing a two-fluid model to describe the gel.
• Analyzing the stability of an active relative force-induced current.
• Incorporating permeation-deformation and permeation-alignment coupling terms.

Main Results:

• Identified novel instability mechanisms at finite wave vectors.
• Predicted the formation of periodic domains and mesophases.
• Demonstrated the role of polar coupling terms in gel behavior.

Conclusions:

• The theory provides a framework for understanding active, polar gels.
• Instabilities can lead to pattern formation in these systems.
• Results offer insights into the physical conditions for multicellular migration.