Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.11801 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914380283641856 |
|---|---|
| author | Claus, Mathias M. Wyss, Marcus Schüler, Dirk Poggio, Martino Gross, Boris |
| author_facet | Claus, Mathias M. Wyss, Marcus Schüler, Dirk Poggio, Martino Gross, Boris |
| contents | Many bacteria share the fascinating ability to sense Earth's magnetic field -- a process known as magnetotaxis. These bacteria synthesize magnetic nanoparticles, called magnetosomes, within their own cell body and arrange them to form a linear magnetic chain. The chain, which behaves like a compass needle, aligns the microorganisms with the geomagnetic field. Here, we measure the magnetic hysteresis of an individual bacterium of the species Magnetospirillum gryphiswaldense via ultrasensitive torque magnetometry. These measurements, in combination with transmission electron microscopy and micromagnetic simulations, reveal the magnetic configurations of the magnetosomes, their progression as a function of applied field, as well as the total remanent magnetic moment and effective magnetic anisotropy of a chain within a single bacterium. Knowledge of magnetic properties is crucial both for understanding the mechanisms behind magnetotaxis and for the design of systems exploiting magnetotactic bacteria in biomedical applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_11801 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic properties of an individual Magnetospirillum gryphiswaldense cell Claus, Mathias M. Wyss, Marcus Schüler, Dirk Poggio, Martino Gross, Boris Biological Physics Mesoscale and Nanoscale Physics Soft Condensed Matter Many bacteria share the fascinating ability to sense Earth's magnetic field -- a process known as magnetotaxis. These bacteria synthesize magnetic nanoparticles, called magnetosomes, within their own cell body and arrange them to form a linear magnetic chain. The chain, which behaves like a compass needle, aligns the microorganisms with the geomagnetic field. Here, we measure the magnetic hysteresis of an individual bacterium of the species Magnetospirillum gryphiswaldense via ultrasensitive torque magnetometry. These measurements, in combination with transmission electron microscopy and micromagnetic simulations, reveal the magnetic configurations of the magnetosomes, their progression as a function of applied field, as well as the total remanent magnetic moment and effective magnetic anisotropy of a chain within a single bacterium. Knowledge of magnetic properties is crucial both for understanding the mechanisms behind magnetotaxis and for the design of systems exploiting magnetotactic bacteria in biomedical applications. |
| title | Magnetic properties of an individual Magnetospirillum gryphiswaldense cell |
| topic | Biological Physics Mesoscale and Nanoscale Physics Soft Condensed Matter |
| url | https://arxiv.org/abs/2403.11801 |