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Equilibrium shape degeneracy in starfish vesicles.

Xavier Michalet¹

¹Chemistry & Biochemistry Department, UCLA, 607 Charles E. Young Drive East, Los Angeles, California 90095, USA. michalet@chem.ucla.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 13, 2007

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Phospholipid vesicles, typically stable, can undergo spontaneous shape changes. Researchers found that specific "starfish" shapes exhibit dramatic transformations due to solution degeneracy, confirmed by experiments.

Area of Science:

Soft matter physics
Biophysics
Materials science

Background:

Phospholipids in aqueous solutions form bilayer vesicles.
Vesicle shapes are governed by curvature elastic energy (Canham-Evans-Helfrich model).
Typically, vesicles with spherical topology lack spontaneous shape transformations due to energy barriers.

Purpose of the Study:

To investigate spontaneous shape transformations in phospholipid vesicles.
To explore shape degeneracy in starfish vesicles with spherical topological genus.
To validate numerical predictions with experimental observations.

Main Methods:

Numerical calculations of vesicle shape dynamics.
Analysis of curvature elastic energy and shape degeneracy.

Related Experiment Videos

Experimental observation of phospholipid vesicle shape evolution.

Main Results:

Identified a class of starfish vesicles exhibiting spontaneous shape transformations.
Demonstrated that shape degeneracy drives these dramatic transformations.
Experimental observations confirmed the predicted transformations in a three-arm starfish vesicle.

Conclusions:

Starfish vesicles can undergo spontaneous, dramatic shape transformations.
Shape degeneracy is a key factor enabling these transformations in vesicles.
The findings bridge theoretical predictions and experimental evidence in soft matter systems.