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Weakly adhering vesicles in shear flow: Tanktreading and anomalous lift force

B. Lorz, R. Simson, J. Nardi and E. Sackmann

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We report the deformation and unbinding of weakly adhering giant vesicles under hydrodynamic shear forces. Linear shear fields are generated in a flat cell and vesicle adhesion onto a supported membrane is generated by electrostatic forces between oppositely charged lipids. The hydrodynamic flow in the aqueous medium near the outer side of the vesicle, within the vesicle and the tanktreading motion in the membrane are observed by tracing small markers attached to the vesicles or suspended in the medium by confocal laser scanning microscopy. The lift force generated by the rotational flow in the vesicle was estimated to be at least two orders of magnitude larger than predicted by the simple theory.


PACS

87.17.-d Cell processes

87.16.-b Subcellular structure and processes

Subjects

Biological physics

Dates

Issue 4 (15 August 2000)

Received 16 December 1999, accepted for publication 14 June 2000, in final form 14 June 2000



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