Rheology of giant vesicles: a micropipette study.
We develop a micropipette rheometer to study the effect of oscillatory shear flow on the spontaneous fluctuations of phospholipid bilayers. Our results on giant vesicles show that oscillatory shear flow leads to a suppression of membrane fluctuations. They also imply that the Helfrich equation is modified in the presence of the flow. This equation, a fundamental constitutive relation between the amount of area stored in the fluctuations and the membrane tension, must be supplemented under oscillatory shear by a flow excess function that we determine.
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LDFC-CNRS UMR 7506, 4 rue Blaise Pascal, 67070 Strasbourg, France.
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Schröder
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D008051:Lipid Bilayers / Q000737:chemistry*; D008954:Models, Biological; D008956:Models, Chemical; D010713:Phosphatidylcholines / Q000737:chemistry*; D012212:Rheology / Q000295:instrumentation / Q000379:methods*
D008051:Lipid Bilayers; D010713:Phosphatidylcholines; C017251:1,2-oleoylphosphatidylcholine