Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 47: Complex Fluids and Soft Matter I (joint session DY/CPP)
DY 47.6: Vortrag
Donnerstag, 23. März 2017, 16:15–16:30, ZEU 160
Tracers in complex environments — •Tatjana Sentjabrskaja1,2, Marco Laurati3, Viktoria Wollrab2, Gijsje Koenderink2, and Stefan Egelhaaf1 — 1Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany — 2FOM Institute AMOLF, Amsterdam, The Netherlands — 3Division de Ciencias e Ingenieria, Universidad de Guanajuato, Leon, Mexico
Biological cells are critically dependent on intracellular transport. To understand the flow of proteins, vesicles and organelles, we study the dynamics of tracers in complex environments, which are modeled using 1) a dense quasi-arrested matrix formed by colloidal hard spheres [1] and 2) a network of semi-flexible actin filaments. The dynamics of the tracer particles in both environments display an anomalous behavior. As a most striking feature the intermediate scattering function of the tracer particles dispersed in dense colloidal matrix displays an extended logarithmic decay resulting from the competition between localization and diffusion.
The characterization of tracer dynamics over a wide range of time and length scales relies on differential dynamic microscopy (DDM) [2-3], which is a powerful combination of microscopy and concepts of light scattering. Thanks to the recent successful extension of DDM to dense systems [4], the application to dense, crowded and multi-component biological systems is feasible.
[1] T. Sentjabrskaja et al., Nat. Com. 7 (2016). [2] R. Cerbino et al., Phys. Rev. Lett. 100 (2008). [3] F. Giavazzi et al., Phys. Rev. R 80 (2009). [4] T. Sentjabrskaja, PhD thesis, HHU (2015).