Buckled in translation

Wandersman, Élie; Quennouz, Nawal; Fermigier, Marc; Lindner, Anke; Roure, Olivia du

doi:10.1039/c0sm00132e

Cited by 62 publications

(82 citation statements)

References 17 publications

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“…Beyond a critical tension (or flow velocity) there is a bifurcation to a buckled state, which then proceeds to rotate and stretch out along the extensional direction. Experiments on macroscopic fibres (Wandersman et al 2010) confirmed the details of this process, but left unexplored the important role of noise in a microscale realization of the instability. This experiment used the crosschannel microfluidic set-up in figure 6 within which were held individual fluorescently labelled actin filaments (Kantsler & Goldstein 2012).…”

Section: Cytoplasmic Streamingmentioning

confidence: 77%

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Goldstein

2016

J. Fluid Mech.

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The world of cellular biology provides us with many fascinating fluid dynamical phenomena that lie at the heart of physiology, development, evolution and ecology. Advances in imaging, micromanipulation and microfluidics over the past decade have made possible high-precision measurements of such flows, providing tests of microhydrodynamic theories and revealing a wealth of new phenomena calling out for explanation. Here I summarize progress in four areas within the field of 'active matter': cytoplasmic streaming in plant cells, synchronization of eukaryotic flagella, interactions between swimming cells and surfaces and collective behaviour in suspensions of microswimmers. Throughout, I emphasize open problems in which fluid dynamical methods are key ingredients in an interdisciplinary approach to the mysteries of life.

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Section: Cytoplasmic Streamingmentioning

confidence: 77%

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Goldstein

2016

J. Fluid Mech.

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“…Evolution of their nonstraight shapes is related to the existence of a family of modes, which are activated if the characteristic parameter exceeds subsequent threshold values. The parameter is determined as the ratio of the viscous forces to the bending ones [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Dynamics of flexible fibers in simple shear and Poiseuille flows has been analyzed theoretically, numerically and experimentally in numerous publications [1][2][3][4][5][6][7][8][9][10][11][12]. Migration of fibers or vesicles in Poiseuille flow [13][14][15][16][17][18][19] is the fundamental problem of modern lab-on-chip hydrodynamics, important in various biological, medical and industrial contexts, such as Brownian dynamics of proteins, actins, DNA or biological polymers, cell motion, swimming of microorganisms, drug delivery, transport of microparticles [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Lateral migration of flexible fibers in Poiseuille flow between two parallel planar solid walls

2013

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Abstract. Dynamics of non-Brownian flexible fibers in Poiseuille flow between two parallel planar solid walls is evaluated from the Stokes equations which are solved numerically by the multipole method. Fibers migrate towards a critical distance from the wall z c, which depends significantly on the fiber length N and bending stiffness A. This effect can be used to sort fibers. Three types of accumulation are found, depending on a shear-to-bending parameter Γ . In the first type, stiff fibers deform only a little and accumulate close to the wall, where their tendency to drift away from the channel is balanced by the repulsive hydrodynamic interaction with the wall. In the second type, flexible fibers deform significantly and accumulate far from the wall. In both types, the fiber shapes at the accumulation positions are repeatable, while in the third type, they are very compact and non-repeatable. The difference between the second and third accumulation types is a special case of the difference between the regular and irregular modes for the dynamics of migrating fibers. At the regular mode, far from walls, the fiber tumbling frequency satisfies Jeffery's expression, with the local shear rate and the aspect ratio close to N .

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“…The junctions at which a given single-stranded tile connects with two neighboring tiles are flexible, allowing the tube to crumple and then straighten when the compressive forces are relieved. This collapse into a coil configuration followed by stretching has been studied for other stiff linear biopolymers and synthetic fibers in hydrodynamic flows near stagnation points (33,37,38). Generally, the tubes will crumple under the compressive flow and reorient and stretch along the axis of the elongational flow (Movie S1 and SI Appendix, section 10).…”

Section: Significancementioning

confidence: 99%

Determining hydrodynamic forces in bursting bubbles using DNA nanotube mechanics

Hariadi

Winfree

Yurke

2015

Proc. Natl. Acad. Sci. U.S.A.

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Quantifying the mechanical forces produced by fluid flows within the ocean is critical to understanding the ocean's environmental phenomena. Such forces may have been instrumental in the origin of life by driving a primitive form of self-replication through fragmentation. Among the intense sources of hydrodynamic shear encountered in the ocean are breaking waves and the bursting bubbles produced by such waves. On a microscopic scale, one expects the surface-tension-driven flows produced during bubble rupture to exhibit particularly high velocity gradients due to the small size scales and masses involved. However, little work has examined the strength of shear flow rates in commonly encountered ocean conditions. By using DNA nanotubes as a novel fluid flow sensor, we investigate the elongational rates generated in bursting films within aqueous bubble foams using both laboratory buffer and ocean water. To characterize the elongational rate distribution associated with a bursting bubble, we introduce the concept of a fragmentation volume and measure its form as a function of elongational flow rate. We find that substantial volumes experience surprisingly large flow rates: during the bursting of a bubble having an air volume of 10 mm 3 , elongational rates at least as large as _ e = 1.0 × 10 8 s −1 are generated in a fragmentation volume of ∼ 2 × 10 −6 μL. The determination of the elongational strain rate distribution is essential for assessing how effectively fluid motion within bursting bubbles at the ocean surface can shear microscopic particles and microorganisms, and could have driven the self-replication of a protobiont.

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Buckled in translation

Cited by 62 publications

References 17 publications

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Lateral migration of flexible fibers in Poiseuille flow between two parallel planar solid walls

Determining hydrodynamic forces in bursting bubbles using DNA nanotube mechanics

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