Concentration Dependence of the Collective Dynamics of Swimming Bacteria

Sokolov, Andrey; Aranson, Igor S.; Kessler, Judd B.; Goldstein, Raymond E.

doi:10.1103/physrevlett.98.158102

Cited by 668 publications

(702 citation statements)

References 17 publications

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“…Note that the collective swimming speed and vortex size are large enough that the Péclet number in these systems can also approach or even exceed unity, implying that flow-induced transport of chemical species can outcompete diffusion, even though at the single-cell level this is not the case. Subsequent experimental work on thin films (Sokolov et al 2007) has shown analogous behaviour, and further investigations of quasi-two-dimensional systems (Cisneros et al 2007Wensink et al 2012;Dunkel et al 2013b) have explored in more detail the nature of this 30 R. E. Goldstein mesoscale 'bacterial turbulence', and in particular the statistics of velocity distributions and correlation functions.…”

Section: Collective Behaviour In Microswimmer Suspensionsmentioning

confidence: 93%

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: Collective Behaviour In Microswimmer Suspensionsmentioning

confidence: 93%

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Goldstein

2016

J. Fluid Mech.

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“…However, the swimming characteristics of the individuals do have an effect: the morphology of a cell can induce complex flow fields, especially in constrained environments, and collective motion can arise (e.g. Sokolov et al, 2007) potentially adjusting effective mechanical properties of the suspension and influencing fluid-substrate interactions and dipersion of signal molecules.…”

Section: Morphologymentioning

confidence: 99%

Bugs on a Slippery Plane

Pushkin

Bees

2016

Biophysics of Infection

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Many pathogenic microoranisms live in close association with surfaces, typically in thin films that either arise naturally or that they themselves create. In response to this constrained environment the cells adjust their behaviour and morphology, invoking communication channels and inducing physical phenomena that allow for rapid colonisation of biomedically relevant surfaces or the promotion of virulence factors. Thus it is very important to measure and theoretically understand the key mechanisms for the apparent advantage obtained from swimming in thin films. We discuss experimental measurements of flows around a peritrichously flagellated bacterium constrained in a thin film, derive a simplified mathematical theory and Green's functions for flows in a thin film with general slip boundary conditions, and establish connections between theoretical and experimental results. This article aims to highlight the importance of mathematics as a tool to unlock qualitative mechanisms associated with experimental observations in the medical and biological sciences.

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“…actinidiae (PSA) is the 40 most important threat to the kiwifruit industry worldwide (Cameron & 45 PSA was first reported in Japan (1984) (Takikawa et al 1989); Korea (1989) (Koh et al 1994) 46 and; in the early 90's, in Italy (Scortichini 1994), although at that time the disease was highly 47 destructive in Japan and Korea, the consequences for the kiwifruit plants in Italy were no more 48 than leaf spot and twig dieback in some orchards (Cameron & 94 move toward a more favorable environment through swimming, which is the individual 95 movement of one bacterium, mainly driven by its flagella (Sokolov et al 2007). This movement 96 allows them to find and associate to more complex bacterial structures, forming multicellular 97 communities (Sokolov et al 2007;Verstraeten et al 2008). These surface-associated 98 multicellular communities are often used by bacteria because they give them several advantages 99 over the individual-cell mode, particularly regarding their resistance to stressful environmental 100 conditions or to chemical compounds (Verstraeten et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Chilean Pseudomonas syringae pv actinidiae strains isolated from infected orchards

Parada

Orellana

Amaza

et al. 2017

Preprint

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Pseudomonas syringae pv. actinidiae (PSA) strain is a major problem for the kiwifruit industry worldwide. So far, 5 biovars of PSA have been identified, of which the most virulent form is biovar 3. This is the only biovar that has been detected in Chile, which is the third kiwifruit exporter country and is currently suffering from canker disease produced by PSA. Single nucleotide polymorphisms (SNPs) analyses have classified the biovar 3 strain into three groups: the European, the New Zealander and the Chilean groups, which have evolved from a common Chinese PSA ancestor. Although Chilean strains have been used in phylogenetic analysis, there is no information about genomic diversity within this group or whether they present microbiological characteristics that could affect its virulence. In this work we studied 15 Chilean bacterial isolates collected from orchards with canker disease symptoms, and classified them as PSA using a different PCR techniques. To gain more information on the relationship between the isolates we sequenced part of three conserved genes widely used to classify bacterial strains: gtl (Citrate Synthase), rpoD (Sigma subunit of RNA polymerase II) and gyrB (Gyrase B). Using these sequences we performed a phylogenetic analysis that included some PSA reference sequences. Fourteen PSA Chilean isolates were grouped with PSA reference strains and three of them formed a subgroup within the PSA clade, suggesting clear differences at the genomic level among the isolates. We evaluated three microbiological traits in all the isolates: motility (swimming and swarming), and ability to induce a hypersensitive response in tobacco plants. All the isolates were able to induce the hypersensitive response in tobacco plants and were also able to perform both types of movements in appropriated growing conditions. PeerJ Preprints | https://doi.org/10.7287/peerj.preprints.2787v1 | CC BY 4.0 Open Access | rec:

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Concentration Dependence of the Collective Dynamics of Swimming Bacteria

Cited by 668 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

Bugs on a Slippery Plane

Characterization of Chilean Pseudomonas syringae pv actinidiae strains isolated from infected orchards

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