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 journalArticleAcademicpeer-review

    12 Citations (Scopus)
    86 Downloads (Pure)


    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 languageEnglish
    Pages (from-to)340-353
    Number of pages14
    JournalJournal of magnetism and magnetic materials
    Publication statusPublished - 15 Aug 2018


    • Magnetotactic bacteria
    • Microfluidic
    • Rotational drag torque
    • Rotational magnetic torque
    • Control


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