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Motion of Euglena gracilis: Active fluctuations and velocity distribution.(Report)

Romanczuk, P. ; Romensky, M. ; Scholz, D. ; Lobaskin, V. ; Schimansky-Geier, L.

The European Physical Journal Special Topics, 2015, Vol.224(7), p.1215(15) [Periódico revisado por pares]

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  • Título:
    Motion of Euglena gracilis: Active fluctuations and velocity distribution.(Report)
  • Autor: Romanczuk, P. ; Romensky, M. ; Scholz, D. ; Lobaskin, V. ; Schimansky-Geier, L.
  • Assuntos: Evolutionary Biology – Analysis
  • É parte de: The European Physical Journal Special Topics, 2015, Vol.224(7), p.1215(15)
  • Descrição: Byline: P. Romanczuk (1,2), M. Romensky (3), D. Scholz (4), V. Lobaskin (5), L. Schimansky-Geier (6) 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. Author Affiliation: (1) Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, 08544, USA (2) Thaer-Institute, Humboldt Universitat zu Berlin, 10099, Berlin, Germany (3) Department of Mathematics, Uppsala University, Box 480, Uppsala, 75106, Sweden (4) Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland (5) School of Physics, Complex and Adaptive Systems Lab, University College Dublin, Belfield, Dublin 4, Ireland (6) Department of Physics, Humboldt Universitat zu Berlin, Newtonstr. 15, 12489, Berlin, Germany Article History: Registration Date: 04/07/2015 Received Date: 08/04/2015 Online Date: 24/07/2015
  • Idioma: Inglês

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