Amorphous entangled active matter

Savoie, William; Tuazon, Harry; Tiwari, Ishant; Bhamla, M. Saad; Goldman, Daniel I.

doi:10.1039/d2sm01573k

Cited by 9 publications

(12 citation statements)

References 56 publications

(87 reference statements)

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“…From a more polymeric perspective, it would be interesting to investigate how the position of a block of active monomers influences the entanglement in very dense conditions. 61,62 Finally, as mentioned in the introduction, chromatin is distinctly characterized by ''sections'', among which the active one is bound to be out-ofequilibrium due to the action of ATP-driven molecular motors: understanding the phenomenology of polymer chains with active sections will be important, in order to include the nonequilibrium effects in chromatin models.…”

Section: Discussionmentioning

confidence: 99%

Conformation and dynamics of partially active linear polymers

Vatin,

Kundu,

Locatelli

2024

Soft Matter

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Section: Discussionmentioning

confidence: 99%

Conformation and dynamics of partially active linear polymers

Vatin,

Kundu,

Locatelli

2024

Soft Matter

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“…Finally, as the number of worms in a group increases, there is a greater likelihood of the worms entangling with each other. This leads to increased movement and internal activity within the group, which may facilitate the worms' ability to collect and gather material from their environment (Patil et al 2023;Savoie et al 2023) .…”

Section: Discussionmentioning

confidence: 99%

Collecting-Gathering Biophysics of the BlackwormL. variegatus

Tuazon

Nguyen

Kaufman

et al. 2023

Preprint

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Many organisms exhibit collecting and gathering behaviors as a foraging and survival method. Certain benthic macroinvertebrates are classified as collector-gatherers due to their collection of particulate matter as a food source, such as the aquatic oligochaete Lumbriculus variegatus (California blackworms). Blackworms demonstrate the ability to ingest organic and inorganic materials, including microplastics, but previous work has only qualitatively described their possible collecting behaviors for such materials. The mechanism through which blackworms consolidate discrete particles into a larger clumps remains unexplored quantitatively. By analyzing a group of blackworms in a large arena with an aqueous algae solution, we discover that their relative collecting efficiency is proportional to population size. Examining individual blackworms under a microscope reveals that both algae and microplastics physically adhere to the worm's body due to external mucus secretions, which cause the materials to clump around the worm. We observe that this clumping reduces the worm's exploration of its environment, potentially due to thigmotaxis. To validate the observed biophysical mechanisms, we create an active polymer model of a worm moving in a field of particulate debris with a short-range attractive force on its body to simulate its adhesive nature. We find that the attractive force increases gathering efficiency. This study offers insights into the mechanisms of collecting-gathering behavior, informing the design of robotic systems, as well as advancing our understanding the ecological impacts of microplastics on benthic invertebrates.

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“…When together at high densities in three-dimensions, the ant collective can be thought of as an active material with well-defined viscoelastic properties. This makes the ants somewhat analogous to other entangled active materials [66], such as clumps of cells [67] and blobs of worms [68], with possible connections to theoretical treatments of active viscoelastic matter [69,70]. Within a certain frequency range, the rheological response of an ant-collective is predominantly elastic, with a mechanical response that is solid-like [58].…”

Section: Activity Cyclesmentioning

confidence: 96%

Active many-particle systems and the emergent behavior of dense ant collectives

Anderson,

Fernandez-Nieves

2024

Rep. Prog. Phys.

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This article discusses recent work with fire ants, Solenopisis invicta, to illustrate the use of the framework of active matter as a base to rationalize their complex collective behavior. We review much of the work that physicists have done on the group dynamics of these ants, and compare their behavior to two minimal models of active matter, and to the behavior of the synthetic systems that have served to test and drive these models.

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Amorphous entangled active matter

Abstract: The design of amorphous entangled systems, specifically from soft and active materials, has the potential to open exciting new classes of active, shape-shifting, and task-capable `smart’ materials. However, the global...

Cited by 9 publications

References 56 publications

Conformation and dynamics of partially active linear polymers

Conformation and dynamics of partially active linear polymers

Collecting-Gathering Biophysics of the BlackwormL. variegatus

Active many-particle systems and the emergent behavior of dense ant collectives

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