Poenisch, W;
Zaburdaev, V;
(2018)
Relative distance between tracers as a measure of diffusivity within moving aggregates.
The European Physical Journal B
, 91
, Article 27. 10.1140/epjb/e2017-80347-5.
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Abstract
Tracking of particles, be it a passive tracer or an actively moving bacterium in the growing bacterial colony, is a powerful technique to probe the physical properties of the environment of the particles. One of the most common measures of particle motion driven by fluctuations and random forces is its diffusivity, which is routinely obtained by measuring the mean squared displacement of the particles. However, often the tracer particles may be moving in a domain or an aggregate which itself experiences some regular or random motion and thus masks the diffusivity of tracers. Here we provide a method for assessing the diffusivity of tracer particles within mobile aggregates by measuring the so-called mean squared relative distance (MSRD) between two tracers. We provide analytical expressions for both the ensemble and time averaged MSRD allowing for direct identification of diffusivities from experimental data.
| Type: | Article |
|---|---|
| Title: | Relative distance between tracers as a measure of diffusivity within moving aggregates |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjb/e2017-80347-5 |
| Publisher version: | http://dx.doi.org/10.1140/epjb/e2017-80347-5 |
| Language: | English |
| Additional information: | © The Author(s) 2018. This article is published with open access at Springerlink.com 2018 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, SINGLE-PARTICLE TRACKING, ANOMALOUS DIFFUSION, MICROSCOPY, PROTEINS, DYNAMICS, WALKS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10058284 |
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