Regensburg 2025 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 6: Active Matter II (joint session BP/CPP/DY)
BP 6.7: Vortrag
Montag, 17. März 2025, 16:45–17:00, H37
Effect of interactions on the chemotactic response of active-passive chains — •Hossein Vahid1, Jens-Uwe Sommer1,2, and Abhinav Sharma3 — 1Leibniz-Institut für Polymerforschung, Dresden, Germany — 2Technische Universität Dresden, Germany — 3University of Augsburg, Augsburg, Germany
Living organisms, from single cells to populations, exhibit complex behaviors driven by the need to navigate toward favorable environments. These behaviors are often shaped by interactions within clusters or mixed populations, where collective dynamics play a crucial role in the characteristic properties of multicellular systems.
Chemotactic bacteria, found in diverse environments such as the gastrointestinal tract, plant surfaces, and aquatic ecosystems, demonstrate the significance of chemotaxis at the population level. While extensive research has focused on the properties of active polymers in spatially homogeneous activity fields, their behaviors in inhomogeneous fields remain less explored.
This study investigates the behavior of self-propelled polymers in activity gradients, emphasizing the effects of inter- and intra-chain interactions, such as steric and excluded volume effects, on chemotactic responses. These interactions give rise to distinct phases or collective behaviors that influence the stability and persistence of chemotaxis. Additionally, polymer density emerges as a critical factor impacting diffusion and the overall efficiency of chemotaxis. This work aims to study the dynamics of the active polymer populations in non-uniform environments systematically.
Keywords: chemotaxis; interactions; density; polymer; steric effects