301 citations · 1.1k across the 19 of their papers we have counts for
20 papers
Elastic interactions compete with persistent cell motility to drive durotaxis
Subhaya Bose, Haiqin Wang, Xinpeng Xu +2
The directed migration of cells toward stiffer substrate regions or durotaxis is relevant to tissue development and tumor progression. Here, we introduce a phenomenological model f…
Collective states of active particles with elastic dipolar interactions
Subhaya Bose, Patrick S. Noerr, Ajay Gopinathan +2
Many types of mammalian cells exert active contractile forces and mechanically deform their elastic substrate, to accomplish biological functions such as cell migration. These subs…
A repeating fast radio burst source in a globular cluster
F. Kirsten, B. Marcote, K. Nimmo +63
Fast radio bursts (FRBs) are exceptionally luminous flashes of unknown physical origin, reaching us from other galaxies (Petroff et al. 2019). Most FRBs have only ever been seen on…
How do biofilms feel their environment?
Merrill Asp, Minh Tri Ho Thanh, Arvind Gopinath +1
The ability of bacteria to colonize and grow on different surfaces is an essential process for biofilm development and depends on complex biomechanical interactions between the bio…
Flapping, swirling and flipping: Non-linear dynamics of pre-stressed active filaments
Soheil Fatehiboroujeni, Arvind Gopinath, Sachin Goyal
Initially straight slender elastic rods with geometrically constrained ends buckle and form stable two-dimensional shapes when compressed by bringing the ends together. It is also…
Effect of Boundary Constraints on the Nonlinear Flapping of Filaments Animated by Follower Forces
Soheil Fatehiboroujeni, Arvind Gopinath, Sachin Goyal
Elastically driven filaments subjected to animating compressive follower forces provide a synthetic way to mimic the oscillatory beating of active biological filaments such as euka…
Follower Forces in Pre-Stressed Fixed-Fixed Rods to Mimic Oscillatory Beating of Active Filaments
Soheil Fatehiboroujeni, Arvind Gopinath, Sachin Goyal
Flagella and cilia are examples of actively oscillating, whiplike biological filaments that are crucial to processes as diverse as locomotion, mucus clearance, embryogenesis and ce…
The propagation of active-passive interfaces in bacterial swarms
Alison E. Patteson, Arvind Gopinath, Paulo E. Arratia
Propagating interfaces are ubiquitous in nature, underlying instabilities and pattern formation in biology and material science. Physical principles governing interface growth are…
Active colloids in complex fluids
Alison E. Patteson, Arvind Gopinath, Paulo E. Arratia
We review recent work on active colloids or swimmers, such as self-propelled microorganisms, phoretic colloidal particles, and artificial micro-robotic systems, moving in fluid-lik…
Running and tumbling with E. coli in polymeric solutions
A. E. Patteson, A. Gopinath, M. Goulian +1
Run-and-tumble motility is widely used by swimming microorganisms including numerous prokaryotic eukaryotic organisms. Here, we experimentally investigate the run-and-tumble dynami…
Flagellar Kinematics and Swimming of Algal Cells in Viscoelastic Fluids
Boyang Qin, Arvind Gopinath, Jing Yang +2
The motility of microorganisms is influenced greatly by their hydrodynamic interactions with the fluidic environment they inhabit. We show by direct experimental observation of the…
Particle diffusion in active fluids is non-monotonic in size
Alison E. Patteson, Arvind Gopinath, Prashant K. Purohit +1
We experimentally investigate the effect of particle size on the motion of passive polystyrene spheres in suspensions of Escherichia coli. Using particles covering a range of sizes…
Persistence of activity in noisy motor-filament assemblies
Raghunath Chelakkot, Arvind Gopinath, L. Mahadevan
Long, elastic filaments cross-linked and deformed by active molecular motors occur in various natural settings. The overall macroscopic mechanical response of such a composite netw…
Persistence of strain in motor-filament assemblies
Arvind Gopinath, Raghunath Chelakkot, L. Mahadevan
Crosslinked semi-flexible and flexible filaments that are actively deformed by molecular motors occur in various natural settings, such as the ordered eukaryotic flagellum, and the…
Flagellar dynamics of a connected chain of active, Brownian particles
Raghunath Chelakkot, Arvind Gopinath, L. Mahadevan +1
Eukaryotic flagella are active structures with a complex architecture of microtubules, motor proteins and elastic links. They are capable of whiplike motions driven by motors slidi…
Dynamical Self-regulation in Self-propelled Particle Flows
Arvind Gopinath, Michael F. Hagan, M. Cristina Marchetti +1
We study a continuum model of overdamped self-propelled particles with an aligning interaction in two dimensions. By combining analytical and numerical work, we map out the phase d…
Viscoelastic flow transitions in abrupt planar contractions
Lars Geneiser, Arvind Gopinath, Robert Armstrong +1
We present experimental evidence of global viscoelastic flow transitions in 2:1, 8:1 and 32:1 planar contractions under inertia-less conditions. Light sheet visualization and laser…
Semi-permeable vesicles composed of natural clay
Anand B. Subramaniam, Jiandi Wan, Arvind Gopinath +1
We report a simple route to form robust, inorganic, semi-permeable compartments composed of montmorillonite, a natural plate-like clay mineral that occurs widely in the environment…
Droplet rebound from rigid or strongly hydrophobic surfaces
A. Gopinath
A weakly deformable droplet impinging on a rigid surface rebounds if the surface is intrinsically hydrophobic or if the gas film trapped underneath the droplet is able to keep the…
Transitions to Nematic states in homogeneous suspensions of high aspect ratio magnetic rods
A. Gopinath, L. Mahadevan, R. C. Armstrong
Isotropic-Nematic and Nematic-Nematic transitions from a homogeneous base state of a suspension of high aspect ratio, rod-like magnetic particles are studied for both Maier-Saupe a…