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Motion of Euglena gracilis: Active fluctuations and velocity distribution
Date Issued
2015-07
Date Available
2017-05-26T16:12:19Z
Abstract
We study the velocity distribution of unicellular swimming algae Euglena gracilis using optical microscopy and active Brownian particle theory. To characterize a peculiar feature of the experimentally observed distribution at small velocities we use the concept of active fluctuations, which was recently proposed for the description of stochastically self-propelled particles [Romanczuk, P. and Schimansky-Geier, L., Phys. Rev. Lett. 106, 230601 (2011)]. In this concept, the fluctuating forces arise due to internal random performance of the propulsive motor. The fluctuating forces are directed in parallel to the heading direction, in which the propulsion acts. In the theory, we introduce the active motion via the depot model [Schweitzer, et al., Phys. Rev. Lett. 80(23), 5044 (1998)]. We demonstrate that the theoretical predictions based on the depot model with active fluctuations are consistent with the experimentally observed velocity distributions. In addition to the model with additive active noise, we obtain theoretical results for a constant propulsion with multiplicative noise.
Other Sponsorship
Deutsche Forschungsgemeinschaft
P.R.I.M.E. fellowship
Type of Material
Journal Article
Publisher
Springer
Journal
European Physical Journal: Special Topics
Volume
224
Issue
7
Start Page
1215
End Page
1229
Copyright (Published Version)
2015 EDP Sciences, Springer
Keywords
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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