Daniel A. Beller
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View article: Dynamics of individual active elastic filaments with chiral self-propulsion
Dynamics of individual active elastic filaments with chiral self-propulsion Open
We study the over-damped dynamics of individual one-dimensional elastic filaments subjected to a chiral active force which propels each point of the filament at a fixed angle relative to the tangent vector of the filament at that point. Su…
View article: Modeling active nematics via the nematic locking principle
Modeling active nematics via the nematic locking principle Open
Active nematic systems consist of rod-like internally driven subunits that interact with one another to form large-scale coherent flows. They are important examples of far-from-equilibrium fluids, which exhibit a wealth of nonlinear behavi…
View article: Geometry-induced competitive release in a meta-population model of range expansions in disordered environments
Geometry-induced competitive release in a meta-population model of range expansions in disordered environments Open
Rare evolutionary events, such as the rise to prominence of deleterious mutations, can have drastic impacts on the evolution of growing populations. Heterogeneous environments may reduce the influence of selection on evolutionary outcomes …
View article: Three-dimensional topological defects and quasi-long-range order in biological liquid crystals
Three-dimensional topological defects and quasi-long-range order in biological liquid crystals Open
Active nematic liquid crystals are the main structural phase of gliomas, promoting collective migration and aggression. We establish the existence of nematic order and topological defect lines and loops in 3D in vivo mouse and human glioma…
View article: Spontaneous Optimal Mixing via Defect-Vortex Coupling in Confined Active Nematics
Spontaneous Optimal Mixing via Defect-Vortex Coupling in Confined Active Nematics Open
Active nematic flows in two dimensions, largely driven by motile $+1/2$ disclinations, mix themselves efficiently and exhibit chaos in the bulk steady state. Motivated by recent experimental findings for three-defect braiding in cardioid-s…
View article: Spontaneous spatial sorting by cell shape in growing colonies of rod-like bacteria
Spontaneous spatial sorting by cell shape in growing colonies of rod-like bacteria Open
Mechanical interactions among cells in a growing microbial colony can significantly influence the colony’s spatial genetic structure and, thus, evolutionary outcomes such as the fates of rare mutations. Here, we computationally investigate…
View article: Spontaneous spatial sorting by cell shape in growing colonies of rod-like bacteria
Spontaneous spatial sorting by cell shape in growing colonies of rod-like bacteria Open
Mechanical interactions among cells in a growing microbial colony can significantly influence the colony's spatial genetic structure and, thus, evolutionary outcomes such as the fates of rare mutations. Here, we computationally investigate…
View article: Templated self-assembly of gold nanoparticles in smectic liquid crystals confined at 3D printed curved surfaces
Templated self-assembly of gold nanoparticles in smectic liquid crystals confined at 3D printed curved surfaces Open
Advancing 3D nanoprinting for curved surface fabrication, liquid crystal confinement, topological defect engineering, and nanomaterial assembly.
View article: Geometry-Induced Competitive Release in a Meta-Population Model of Range Expansions in Disordered Environments
Geometry-Induced Competitive Release in a Meta-Population Model of Range Expansions in Disordered Environments Open
A bstract Rare evolutionary events, such as the rise to prominence of deleterious mutations, can have drastic impacts on the evolution of growing populations. Heterogeneous environments may reduce the influence of selection on evolutionary…
View article: Geometry-Induced Competitive Release in a Meta-Population Model of Range Expansions in Disordered Environments
Geometry-Induced Competitive Release in a Meta-Population Model of Range Expansions in Disordered Environments Open
Rare evolutionary events, such as the rise to prominence of deleterious mutations, can have drastic impacts on the evolution of growing populations. Heterogeneous environments may reduce the influence of selection on evolutionary outcomes …
View article: Range expansions across landscapes with quenched noise
Range expansions across landscapes with quenched noise Open
When biological populations expand into new territory, the evolutionary outcomes can be strongly influenced by genetic drift, the random fluctuations in allele frequencies. Meanwhile, spatial variability in the environment can also signifi…
View article: Symmetry and stability of orientationally ordered collective motions of self-propelled, semiflexible filaments
Symmetry and stability of orientationally ordered collective motions of self-propelled, semiflexible filaments Open
Ordered, collective motions commonly arise spontaneously in systems of many interacting, active units, ranging from cellular tissues and bacterial colonies to self-propelled colloids and animal flocks. Active phases are especially rich whe…
View article: Connecting the Dots: Range Expansions across Landscapes with Quenched Noise
Connecting the Dots: Range Expansions across Landscapes with Quenched Noise Open
When biological populations expand into new territory, the evolutionary outcomes can be strongly influenced by genetic drift, the random fluctuations in allele frequencies. Meanwhile, spatial variability in the environment can also signifi…
View article: Sequences of dislocation reactions and helicity transformations in tubular crystals
Sequences of dislocation reactions and helicity transformations in tubular crystals Open
Freestanding tubular crystals offer a general description of crystalline order on deformable surfaces with cylindrical topology, such as single-walled carbon nanotubes, microtubules, and recently reported colloidal assemblies. These system…
View article: Maximally mixing active nematics
Maximally mixing active nematics Open
Active nematics are an important new paradigm in soft condensed matter systems. They consist of rod-like components with an internal driving force pushing them out of equilibrium. The resulting fluid motion exhibits chaotic advection, in w…
View article: Templated self-assembly of gold nanoparticles in smectic liquid crystals confined at 3D printed curved surfaces
Templated self-assembly of gold nanoparticles in smectic liquid crystals confined at 3D printed curved surfaces Open
The fabrication of assembled structures of topological defects in liquid crystals (LCs) has attracted much attention during the last decade, stemming from the potential application of these defects in modern technologies. A range of techni…
View article: Symmetry and stability of orientationally ordered collective motions of self-propelled, semiflexible filaments
Symmetry and stability of orientationally ordered collective motions of self-propelled, semiflexible filaments Open
Ordered, collective motions commonly arise spontaneously in systems of many interacting, active units, ranging from cellular tissues and bacterial colonies to self-propelled colloids and animal flocks. Active phases are especially rich whe…
View article: Do Active Nematic Self-Mixing Dynamics Help Growing Bacterial Colonies to Maintain Local Genetic Diversity?
Do Active Nematic Self-Mixing Dynamics Help Growing Bacterial Colonies to Maintain Local Genetic Diversity? Open
Recent studies have shown that packings of cells, both eukaryotic cellular tissues and growing or swarming bacterial colonies, can often be understood as active nematic fluids. A key property of volume-conserving active nematic model syste…
View article: Do active nematic self-mixing dynamics help growing bacterial colonies to maintain local genetic diversity?
Do active nematic self-mixing dynamics help growing bacterial colonies to maintain local genetic diversity? Open
Recent studies have shown that packings of cells, both eukaryotic cellular tissues and growing or swarming bacterial colonies, can often be understood as active nematic fluids. A key property of volume-conserving active nematic model syste…
View article: Shape multistability in flexible tubular crystals through interactions of mobile dislocations
Shape multistability in flexible tubular crystals through interactions of mobile dislocations Open
Significance Crystalline sheets rolled up into cylinders occur in diverse biological and synthetic systems, including carbon nanotubes, biofilaments of the cellular cytoskeleton, and packings of colloidal particles. In this work, we show, …
View article: Active nematic order and dynamic lane formation of microtubules driven by membrane-bound diffusing motors
Active nematic order and dynamic lane formation of microtubules driven by membrane-bound diffusing motors Open
Significance Active nematics are ordered liquid crystalline fluids that exhibit spontaneous persistent flows and collective dynamics. The development of motile biopolymer systems inspired by nature has recently attracted considerable atten…
View article: Geometrical Frustration and Defect Formation in Growth of Colloidal Nanoparticle Crystals on a Cylinder: Implications for Assembly of Chiral Nanomaterials
Geometrical Frustration and Defect Formation in Growth of Colloidal Nanoparticle Crystals on a Cylinder: Implications for Assembly of Chiral Nanomaterials Open
Using a combination of experiment and simulation, we study how two-dimensional (2D) crystals of colloidal nanoparticles grow on cylindrical substrates. The cylindrical geometry allows us to examine growth in the absence of Gaussian curvatu…
View article: Emergence and stabilization of transient twisted defect structures in confined achiral liquid crystals at a phase transition
Emergence and stabilization of transient twisted defect structures in confined achiral liquid crystals at a phase transition Open
We report a transient twist observed in common thermotropic, achiral liquid crystals at the transition between the smectic and the nematic phase. This is explained with the combined effect of the change of the elastic constants at the phas…
View article: Fast, Scalable, and Interactive Software for Landau-de Gennes Numerical Modeling of Nematic Topological Defects
Fast, Scalable, and Interactive Software for Landau-de Gennes Numerical Modeling of Nematic Topological Defects Open
Numerical modeling of nematic liquid crystals using the tensorial Landau-de\nGennes (LdG) theory provides detailed insights into the structure and\nenergetics of the enormous variety of possible topological defect\nconfigurations that may …
View article: Deck the Walls with Anisotropic Colloids in Nematic Liquid Crystals
Deck the Walls with Anisotropic Colloids in Nematic Liquid Crystals Open
Nematic liquid crystals (NLCs) offer remarkable opportunities to direct colloids to form complex structures. The elastic energy field that dictates colloid interactions is determined by the NLC director field, which is sensitive to and can…
View article: Topological defects and geometric memory across the nematic-smectic A liquid crystal phase transition
Topological defects and geometric memory across the nematic-smectic A liquid crystal phase transition Open
We study transformations of self-organized defect arrays at the nematic-smectic A liquid crystal phase transition, and show that these defect configurations are correlated, or "remembered", across the phase transition. A thin film of therm…
View article: Topological defects and geometric memory across the nematic-smectic A\n liquid crystal phase transition
Topological defects and geometric memory across the nematic-smectic A\n liquid crystal phase transition Open
We study transformations of self-organized defect arrays at the\nnematic-smectic A liquid crystal phase transition, and show that these defect\nconfigurations are correlated, or "remembered", across the phase transition. A\nthin film of th…
View article: Colloids in confined liquid crystals: a plot twist in the lock-and-key mechanism
Colloids in confined liquid crystals: a plot twist in the lock-and-key mechanism Open
By confining soft materials within tailored boundaries it is possible to design energy landscapes to address and control colloidal dynamics. Twist distortions in confined liquid crystals multiply configurations for particles-boundaries int…
View article: Evolution in range expansions with competition at rough boundaries
Evolution in range expansions with competition at rough boundaries Open
When a biological population expands into new territory, genetic drift develops an enormous influence on evolution at the propagating front. In such range expansion processes, fluctuations in allele frequencies occur through stochastic \te…
View article: Evolution of populations expanding on curved surfaces <sup>(a)</sup>
Evolution of populations expanding on curved surfaces <sup>(a)</sup> Open
The expansion of a population into new habitat is a transient process that leaves its footprints in the genetic composition of the expanding population. How the structure of the environment shapes the population front and the evolutionary …