Three-dimensional chiral active Ornstein-Uhlenbeck model for helical motion of microorganisms
Active movement is essential for the survival of microorganisms like bacteria, algae, and unicellular parasites. In three dimensions, both swimming and gliding microorganisms often exhibit helical trajectories. One such case are malaria parasites gliding through 3D hydrogels, for which we find that...
Gespeichert in:
| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
18 September 2025
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| In: |
Physical review letters
Year: 2025, Jahrgang: 135, Heft: 12, Pages: 1-9 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/4kxb-h6p4 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/4kxb-h6p4 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/4kxb-h6p4 
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| Verfasserangaben: | Leon Lettermann, Falko Ziebert, Mirko Singer, Friedrich Frischknecht, Ulrich S. Schwarz |
MARC
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| 520 | |a Active movement is essential for the survival of microorganisms like bacteria, algae, and unicellular parasites. In three dimensions, both swimming and gliding microorganisms often exhibit helical trajectories. One such case are malaria parasites gliding through 3D hydrogels, for which we find that the internal correlation time for the stochastic process generating propulsion is similar to the time taken for one helical turn. Motivated by this experimental finding, here we theoretically analyze the case of finite internal correlation time for microorganisms with helical trajectories as chiral active particles with an Ornstein-Uhlenbeck process for torque. We present an analytical solution which is in very good agreement with computer simulations. We then show that, for this type of internal noise, chirality and rotation increase the persistence of motion and results in helical trajectories that have a larger long-time mean squared displacement than straight trajectories at the same propulsion speed. Finally, we provide experimental evidence for this prediction for the case of malaria parasites. | ||
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