Christina Kurzthaler
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View article: Hydroelastic scattering and trapping of microswimmers
Hydroelastic scattering and trapping of microswimmers Open
Deformable boundaries are omnipresent in the habitats of swimming microorganisms, leading to intricate hydroelastic couplings. Employing a perturbation theory, valid for small deformations, we study the swimming dynamics of pushers and pul…
View article: Sperm hyperactivation drives a circling-and-wandering migration strategy
Sperm hyperactivation drives a circling-and-wandering migration strategy Open
During migration through the female reproductive tract, sperm undergo physiological changes known as capacitation, including a motility transition termed hyperactivation. Hyperactivation is essential for various aspects of fertilization, p…
View article: First-passage-time statistics of active Brownian particles: A perturbative approach
First-passage-time statistics of active Brownian particles: A perturbative approach Open
We study the first-passage-time (FPT) properties of active Brownian particles to reach an absorbing wall in two dimensions. Employing a perturbation approach, we obtain exact analytical predictions for the survival and FPT distributions fo…
View article: Optimal first-passage times of active Brownian particles under stochastic resetting
Optimal first-passage times of active Brownian particles under stochastic resetting Open
We study the first-passage-time (FPT) properties of an active Brownian particle under stochastic resetting to its initial configuration, comprising its position and orientation, to reach an absorbing wall in two dimensions. Coupling a pert…
View article: Flow through porous media at the percolation transition
Flow through porous media at the percolation transition Open
We study low-Reynolds-number fluid flow through a two-dimensional porous medium modeled as a Lorentz gas. Using extensive finite-element simulations we fully resolve the flow fields for packing fractions approaching the percolation thresho…
View article: Hydroelastic scattering and trapping of microswimmers
Hydroelastic scattering and trapping of microswimmers Open
Deformable boundaries are omnipresent in the habitats of swimming microorganisms, leading to intricate hydroelastic couplings. Employing a perturbation theory, valid for small deformations, we study the swimming dynamics of pushers and pul…
View article: The 2025 motile active matter roadmap
The 2025 motile active matter roadmap Open
Activity and autonomous motion are fundamental aspects of many living and engineering systems. Here, the scale of biological agents covers a wide range, from nanomotors, cytoskeleton, and cells, to insects, fish, birds, and people. Inspire…
View article: Optimal first-passage times of active Brownian particles under stochastic resetting
Optimal first-passage times of active Brownian particles under stochastic resetting Open
Optimal resetting protocols for active agents are determined by the intricate interplay of resetting, rotational Brownian noise, and active motion.
View article: The 2024 Motile Active Matter Roadmap
The 2024 Motile Active Matter Roadmap Open
Activity and autonomous motion are fundamental aspects of many living and engineering systems. Here, the scale of biological agents covers a wide range, from nanomotors, cytoskeleton, and cells, to insects, fish, birds, and people. Inspire…
View article: Cell shape affects bacterial colony growth under physical confinement
Cell shape affects bacterial colony growth under physical confinement Open
Evidence from homogeneous liquid or flat-plate cultures indicates that biochemical cues are the primary modes of bacterial interaction with their microenvironment. However, these systems fail to capture the effect of physical confinement o…
View article: Active Brownian particle under stochastic orientational resetting
Active Brownian particle under stochastic orientational resetting Open
We employ renewal processes to characterize the spatiotemporal dynamics of an active Brownian particle under stochastic orientational resetting. By computing the experimentally accessible intermediate scattering function (ISF) and reconstr…
View article: Flow Through Porous Media at the Percolation Transition
Flow Through Porous Media at the Percolation Transition Open
We study low-Reynolds-number fluid flow through a two-dimensional porous medium modeled as a Lorentz gas. Using extensive finite element simulations we fully resolve the flow fields for packing fractions approaching the percolation thresho…
View article: Active Brownian particle under stochastic orientational resetting
Active Brownian particle under stochastic orientational resetting Open
We employ renewal processes to characterize the spatiotemporal dynamics of an active Brownian particle under stochastic orientational resetting. By computing the experimentally accessible intermediate scattering function (ISF) and reconstr…
View article: Physical confinement selectively favours bacterial growth based on cell shape
Physical confinement selectively favours bacterial growth based on cell shape Open
How are bacterial communities altered by changes in their microenvironment? Evidence from homogeneous liquid or flat plate cultures implicates biochemical cues — such as variation in nutrient composition 1,2 , response to chemoattractants …
View article: Surface corrugations induce helical near-surface flows and transport in microfluidic channels
Surface corrugations induce helical near-surface flows and transport in microfluidic channels Open
We study theoretically and experimentally pressure-driven flow between a flat wall and a parallel corrugated wall, a design used widely in microfluidics for low-Reynolds-number mixing and particle separation. In contrast to previous work, …
View article: Characterization and Control of the Run-and-Tumble Dynamics of <i>Escherichia Coli</i>
Characterization and Control of the Run-and-Tumble Dynamics of <i>Escherichia Coli</i> Open
We characterize the full spatiotemporal gait of populations of swimming using renewal processes to analyze the measurements of intermediate scattering functions. This allows us to demonstrate quantitatively how the persistence length of an…
View article: Quantitative characterization of run-and-tumble statistics in bulk bacterial suspensions
Quantitative characterization of run-and-tumble statistics in bulk bacterial suspensions Open
We introduce a numerical method to extract the parameters of run-and-tumble dynamics from experimental measurements of the intermediate scattering function. We show that proceeding in Laplace space is unpractical and employ instead renewal…
View article: Giant Activity-Induced Stress Plateau in Entangled Polymer Solutions
Giant Activity-Induced Stress Plateau in Entangled Polymer Solutions Open
We study the viscoelastic properties of highly entangled, flexible, self-propelled polymers using Brownian dynamics simulations. Our results show that the active motion of the polymer increases the height of the stress plateau by orders of…
View article: Modeling of Sedimentation of Particles near Corrugated Surface by Boundary Singularity Method
Modeling of Sedimentation of Particles near Corrugated Surface by Boundary Singularity Method Open
The velocity and trajectory of particle moving along the corrugated (rough) surface under action of gravity is obtained by meshless Boundary Singularity Method (BSM). This physical situation is found often in biological systems and microfl…
View article: Transport of a passive scalar in wide channels with surface topography: An asymptotic theory
Transport of a passive scalar in wide channels with surface topography: An asymptotic theory Open
We generalize classical dispersion theory for a passive scalar to derive an asymptotic long-time convection–diffusion equation for a solute suspended in a wide, structured channel and subject to a steady low-Reynolds-number shear flow. Our…
View article: Hydrodynamics of Cell Swimming
Hydrodynamics of Cell Swimming Open
To optimize their survival strategies many microorganisms use a variety of different swimming mechanisms, which often rely on the use of cellular appendages, such as flagella or cilia. In this chapter, we revisit different models for the h…
View article: What is ‘Active Matter’?
What is ‘Active Matter’? Open
Over the past decades, active matter systems have attracted the attention of scientists from different areas, including physics, engineering, biology, and the human sciences. These systems involve agents that convert some type of energy in…
View article: Shape of a tethered filament in various low-Reynolds-number flows
Shape of a tethered filament in various low-Reynolds-number flows Open
We consider the steady-state deformation of an elastic filament in various unidirectional, low-Reynolds-number flows, with the filament either clamped at one end, perpendicular to the flow, or tethered at its center and deforming symmetric…
View article: Quantitative characterization of run-and-tumble statistics in bulk bacterial suspensions
Quantitative characterization of run-and-tumble statistics in bulk bacterial suspensions Open
We introduce a numerical method to extract the parameters of run-and-tumble dynamics from experimental measurements of the intermediate scattering function. We show that proceeding in Laplace space is unpractical and employ instead renewal…
View article: Characterization and Control of the Run-and-Tumble Dynamics of {\it Escherichia Coli}
Characterization and Control of the Run-and-Tumble Dynamics of {\it Escherichia Coli} Open
We characterize the full spatiotemporal gait of populations of swimming {\it Escherichia coli} using renewal processes to analyze the measurements of intermediate scattering functions. This allows us to demonstrate quantitatively how the p…
View article: Transport of a passive scalar in wide channels with surface topography
Transport of a passive scalar in wide channels with surface topography Open
We generalize classical dispersion theory for a passive scalar to derive an asymptotic long-time convection-diffusion equation for a solute suspended in a wide, structured channel and subject to a steady low-Reynolds-number shear flow. Our…
View article: Hydrodynamically induced helical particle drift due to patterned surfaces
Hydrodynamically induced helical particle drift due to patterned surfaces Open
Advances in microfabrication enable the tailoring of surfaces to achieve optimal sorting, mixing, and focusing of complex particulate suspensions in microfluidic devices. Corrugated surfaces have proved to be a powerful tool to manipulate …