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Coiled to Diffuse: BrownianMotion of a Helical Bacterium.

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Title: Coiled to Diffuse: BrownianMotion of a Helical Bacterium.
Authors: Butenko, Alexander V.1, Mogilko, Emma1, Amitai, Lee1, Pokroy, Boaz1, Sloutskin, Eli1
Source: Langmuir. Sep2012, Vol. 28 Issue 36, p12941-12947. 7p.
Subjects: Spirochetes, Wiener processes, Helical structure, Diffusion, Comparative studies, Physics experiments
Abstract: We employ real-time three-dimensional confocal microscopyto followthe Brownian motion of a fixed helically shaped Leptospirainterrogans(LI) bacterium. We extract from our measurementsthe translational and the rotational diffusion coefficients of thisbacterium. A simple theoretical model is suggested, perfectly reproducingthe experimental diffusion coefficients, with no tunable parameters.An older theoretical model, where edge effects are neglected, dramaticallyunderestimates the observed rates of translation. Interestingly, thecoiling of LI increases its rotational diffusion coefficient by afactor of 5, compared to a (hypothetical) rectified bacterium of thesame contour length. Moreover, the translational diffusion coefficientswould have decreased by a factor of ∼1.5, if LI were rectified.This suggests that the spiral shape of the spirochaete bacteria, inaddition to being employed for their active twisting motion, may alsoincrease the ability of these bacteria to explore the surroundingfluid by passive Brownian diffusion. [ABSTRACT FROM AUTHOR]
Copyright of Langmuir is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Spirochetes%22">Spirochetes</searchLink><br /><searchLink fieldCode="DE" term="%22Wiener+processes%22">Wiener processes</searchLink><br /><searchLink fieldCode="DE" term="%22Helical+structure%22">Helical structure</searchLink><br /><searchLink fieldCode="DE" term="%22Diffusion%22">Diffusion</searchLink><br /><searchLink fieldCode="DE" term="%22Comparative+studies%22">Comparative studies</searchLink><br /><searchLink fieldCode="DE" term="%22Physics+experiments%22">Physics experiments</searchLink>
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  Data: We employ real-time three-dimensional confocal microscopyto followthe Brownian motion of a fixed helically shaped Leptospirainterrogans(LI) bacterium. We extract from our measurementsthe translational and the rotational diffusion coefficients of thisbacterium. A simple theoretical model is suggested, perfectly reproducingthe experimental diffusion coefficients, with no tunable parameters.An older theoretical model, where edge effects are neglected, dramaticallyunderestimates the observed rates of translation. Interestingly, thecoiling of LI increases its rotational diffusion coefficient by afactor of 5, compared to a (hypothetical) rectified bacterium of thesame contour length. Moreover, the translational diffusion coefficientswould have decreased by a factor of ∼1.5, if LI were rectified.This suggests that the spiral shape of the spirochaete bacteria, inaddition to being employed for their active twisting motion, may alsoincrease the ability of these bacteria to explore the surroundingfluid by passive Brownian diffusion. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Langmuir is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1021/la302056j
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 12941
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      – SubjectFull: Spirochetes
        Type: general
      – SubjectFull: Wiener processes
        Type: general
      – SubjectFull: Helical structure
        Type: general
      – SubjectFull: Diffusion
        Type: general
      – SubjectFull: Comparative studies
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      – SubjectFull: Physics experiments
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      – TitleFull: Coiled to Diffuse: BrownianMotion of a Helical Bacterium.
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            NameFull: Pokroy, Boaz
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            NameFull: Sloutskin, Eli
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              M: 09
              Text: Sep2012
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