Theoretical and phase contrast microscopic eigenmode analysis of erythrocyte flicker : amplitudes

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Abstract
The energy eigenmodes of an erythrocyte with elastic properties described by a curvature modulus kc and a shear modulus μ are computed, both for fixed spontaneous curvature c0, and in the bilayer coupling hypothesis (fixed ⟨H⟩). The corresponding thickness fluctuation profiles depend on the relative importance of kc and μ. A phase contrast microscopy determination of the thickness fluctuation profile indicates that μ, at least in this process, is very small. The data favor fixed ⟨H⟩ over fixed c0. kc is about 4.3×10-19 J if c0 fixed and 1.4×10-19 J if ⟨H⟩ is fixed

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