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Microscopic Masterminds: The Structural Genius of Bacteria

October 10, 2023
in Science
Microscopic Masterminds: The Structural Genius of Bacteria
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Colorful Bacteria Petri Dish Concept Art

Scientists at MPI-DS reveal how bacterial interactions lead to complex patterns and introduce a versatile model that can decode collective behaviors in various entities, from bacteria to robotic swarms.

A new model demonstrates that chasing interactions can induce dynamical patterns in the organization of bacterial species.

Structural patterns can be created due to the chasing interactions between two bacterial species. In a new model, scientists from the Max Planck Institute for Dynamics and Self-Organization (MPI-DS) describe how interactions on the individual level can result in a global self-organization of species. Their findings provide insights into general mechanisms of collective behavior.

In a recent study, scientists from the Department of Living Matter Physics at MPI-DS developed a model describing communication pathways in bacterial populations. Bacteria show an overall organizational pattern by sensing the concentration of chemicals in their environment and adapting their motion.

The structure only becomes visible on a higher level

“We modeled the non-reciprocal interaction between two bacterial species,” first author Yu Duan explains. “This means that species A is chasing species B, whereas B is aiming to repel from A,” he continues. The researchers found, that just this chase-and-avoid interaction is sufficient to form a structural pattern. The type of the resulting pattern depends on the strength of the interaction. This complements a previous study, where a model was proposed that also included intraspecies interactions of the bacteria in order to form a pattern.

Patterns of Self-Organization

Depending on the chase-and-avoid interaction between two species, A and B, different patterns of self-organization can evolve on the global level. Credit: MPI-DS / LMP

In this new model, which also includes the effect of bacterial motility, neither adhesion nor alignment are required to form complex super-structures encompassing millions of individuals. “Although the bacterial population dynamics show a global order, this is not the case on the individual bacterial level. In particular, a single bacterium seems to move in a disordered way, with the structure becoming visible only on a higher level, which is very fascinating,” summarizes Benoît Mahault, group leader in the department Living Matter Physics at MPI-DS.

A general model for collective behavior

The model also allows to consideration of more than two species, increasing the amount of possible interactions and emerging patterns. Notably, it is also not limited to bacteria but can be applied to a variety of collective behaviors. These include light-controlled microswimmers, social insects, animal groups, and robotic swarms. The study therefore provides general insights on the mechanisms responsible for the formation of large-scale structures in networks with many components.

Reference: “Dynamical Pattern Formation without Self-Attraction in Quorum-Sensing Active Matter: The Interplay between Nonreciprocity and Motility” by Yu Duan, Jaime Agudo-Canalejo, Ramin Golestanian and Benoît Mahault, 3 October 2023, Physical Review Letters.
DOI: 10.1103/PhysRevLett.131.148301

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/microscopic-masterminds-the-structural-genius-of-bacteria/

Tags: MastermindsMicroscopicscience
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