| Buckling of actin-coated membranes under application of a local force (2001) | |||||||||
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| VOLUME NUMBER PHYSICAL REVIEW LETTERS AUGUST Buckling Actin Coated Membranes under Application Local Force Helfer Harlepp Bourdieu Robert MacKintosh and Chatenay Laboratoire Dynamique des Fluides Complexes C Strasbourg France Department Physics University Michigan Ann Arbor Michigan Received February published August The mechanical properties composite membranes obtained self assembly actin filaments with giant fluid vesicles are studied micromanipulation with optical tweezers These complexes exhibit typical mechanical features solid shell including finite plane shear elastic modulus buckling instability observed when localized force the order applied perpendicular the membrane plane Although predicted for polymerized vesicles this the first evidence such instability DOI PhysRevLett PACS numbers r Solid tethered polymerized membranes have been studied detail over the years from the theoretical point view They exhibit rich fluctuation properties and have been viewed simple mechanical models cells plasma membrane Red blood cells for example possess two dimensional cross linked spectrin network underlying the lipid membrane partly responsible for their equilibrium shapes mechanical properties and thermal shape fluctuations Similarly many eukaryotic cells thick actin cortex associated with the plasma membrane partly responsible for cell shape and mechanical properties From physical point view membranes can considered thin elastic shells thickness with bending modulus plane shear | |||||||||
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