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. Author manuscript; available in PMC: 2015 May 28.
Published in final edited form as: Phys Rev Lett. 2012 Jun 8;108(23):238107. doi: 10.1103/PhysRevLett.108.238107

Fig. 2.

Fig. 2

Buckling in nonsarcomeric contractile actomyosin bundles. (a) Time-lapse images of fluorescent actin (inverted contrast) showing F-actin buckling (arrowheads) following the addition of 1 mM ATP at t = 0 s. Scale bar, 5 μm. See also movie S2 [18]. (b) Relative contraction (filled squares) and number of F-actin buckles (open circles) as a function of time. Data show mean ±sd averaged over n = 3 bundles with ℓ0 ≃ 1 μm. (c) The presence of fast (gray) and slow (white) motors generically induce compressive (solid red) and extensile (hatched blue) stresses in filaments. (d) Buckling of the compressed filaments leads to an overall shortening of the bundle.