Magnetic response of Magnetospirillum gryphiswaldense observed inside a microfluidic channel

M.P. Pichel; T.A.G. Hageman; I.S.M. Khalil; A. Manz; L. Abelmann

doi:10.1016/j.jmmm.2018.04.004

Magnetic response of Magnetospirillum gryphiswaldense observed inside a microfluidic channel

M.P. Pichel, T.A.G. Hageman, I.S.M. Khalil, A. Manz, L. Abelmann^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

In this study we modelled and measured the U-turn trajectories of individual magnetotactic bacteria under the application of rotating magnetic fields, ranging in amplitude from 1 to 12 mT. The model is based on the balance between rotational drag and magnetic torque. For accurate verification of this model, bacteria were observed inside 5 μm tall microfluidic channels, so that they remained in focus during the entire trajectory. From the analysis of hundreds of trajectories and accurate measurements of bacteria and magnetosome chain dimensions, we confirmed that the model is correct within measurement error. The resulting average rate of rotation of Magnetospirillum gryphiswaldense is 0.74 ± 0.03 rad/mTs.

Original language	English
Pages (from-to)	340-353
Number of pages	14
Journal	Journal of magnetism and magnetic materials
Volume	460
DOIs	https://doi.org/10.1016/j.jmmm.2018.04.004
Publication status	Published - 15 Aug 2018

Keywords

Magnetotactic bacteria
Microfluidic
Rotational drag torque
Rotational magnetic torque
Control

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10.1016/j.jmmm.2018.04.004

Pichel2018magneticAccepted author version, 8.42 MBLicence: CC BY-NC-ND

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title = "Magnetic response of Magnetospirillum gryphiswaldense observed inside a microfluidic channel",

abstract = "In this study we modelled and measured the U-turn trajectories of individual magnetotactic bacteria under the application of rotating magnetic fields, ranging in amplitude from 1 to 12 mT. The model is based on the balance between rotational drag and magnetic torque. For accurate verification of this model, bacteria were observed inside 5 μm tall microfluidic channels, so that they remained in focus during the entire trajectory. From the analysis of hundreds of trajectories and accurate measurements of bacteria and magnetosome chain dimensions, we confirmed that the model is correct within measurement error. The resulting average rate of rotation of Magnetospirillum gryphiswaldense is 0.74 ± 0.03 rad/mTs.",

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AU - Pichel, M.P.

AU - Hageman, T.A.G.

AU - Khalil, I.S.M.

AU - Manz, A.

AU - Abelmann, L.

PY - 2018/8/15

Y1 - 2018/8/15

N2 - In this study we modelled and measured the U-turn trajectories of individual magnetotactic bacteria under the application of rotating magnetic fields, ranging in amplitude from 1 to 12 mT. The model is based on the balance between rotational drag and magnetic torque. For accurate verification of this model, bacteria were observed inside 5 μm tall microfluidic channels, so that they remained in focus during the entire trajectory. From the analysis of hundreds of trajectories and accurate measurements of bacteria and magnetosome chain dimensions, we confirmed that the model is correct within measurement error. The resulting average rate of rotation of Magnetospirillum gryphiswaldense is 0.74 ± 0.03 rad/mTs.

AB - In this study we modelled and measured the U-turn trajectories of individual magnetotactic bacteria under the application of rotating magnetic fields, ranging in amplitude from 1 to 12 mT. The model is based on the balance between rotational drag and magnetic torque. For accurate verification of this model, bacteria were observed inside 5 μm tall microfluidic channels, so that they remained in focus during the entire trajectory. From the analysis of hundreds of trajectories and accurate measurements of bacteria and magnetosome chain dimensions, we confirmed that the model is correct within measurement error. The resulting average rate of rotation of Magnetospirillum gryphiswaldense is 0.74 ± 0.03 rad/mTs.

KW - Magnetotactic bacteria

KW - Microfluidic

KW - Rotational drag torque

KW - Rotational magnetic torque

KW - Control

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JO - Journal of magnetism and magnetic materials

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Magnetic response of Magnetospirillum gryphiswaldense observed inside a microfluidic channel

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