Differently from passive Brownian particles, active particles, also known as self-propelled
Brownian particles or microswimmers and nanoswimmers, are capable of taking up energy …

The term “bioconvection” describes hydrodynamic instabilities and patterns in suspensions
of biased swimming microorganisms. Hydrodynamic instabilities arise from coupling …

In plankton ecology, biological and physical dynamics are coupled, structuring how plankton
interact with their environment and other organisms. This interdisciplinary field has …

The emergence of coherent structures, large-scale flows and correlated dynamics in
suspensions of motile particles such as swimming micro-organisms or artificial …

In 1952, Lighthill introduced the simplest possible model of a swimming micro-organism of
finite size, intended as a model of a single-celled protozoan covered in beating cilia. The …

Microswimmers can serve as cargo carriers that move deep inside complex flow networks.
When a school collectively entrains the surrounding fluid, their transport capacity can be …

The self-propulsion of a spherical squirmer–a model swimming organism that achieves
locomotion via steady tangential movement of its surface–is quantified across the transition …

We analyse a simple 'Stokesian squirmer'model for the enhanced mixing due to swimming
micro-organisms. The model is based on a calculation of Thiffeault & Childress (Phys. Lett …

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 from …

We present theoretical predictions, simulations, and experimental measurements of the
diffusion of passive, Brownian tracer particles in the bulk of three-dimensional suspensions …