Reentrant Efficiency of Phototaxis in Chlamydomonas reinhardtii Cells

Choudhary, Sujeet Kumar; Baskaran, Aparna; Sharma, Prerna

doi:10.1016/j.bpj.2019.09.016

Cited by 20 publications

(20 citation statements)

References 36 publications

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“…This peculiar behavior is due to the morphology of this alga, characterized by an 'eyespot' sensible to light located near the cell equator. Rotating around its own axis the alga allows the eyespot to better scan the surrounding environment looking for light, needed to perform photosyntesis [6]. In this paper, we report observations and quantification of individual rotation and the formation of rotating clusters, in analogy to what observed for model systems of active rotating disks in 2D passive media [7].…”

Section: Introductionmentioning

confidence: 84%

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Unjamming of active rotators

Ravazzano¹,

Lionetti²,

Fumagalli³

et al. 2020

Preprint

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Active particle assemblies can exhibit a wide range of interesting dynamical phases depending on internal parameters such as density, adhesion strength or self-propulsion. Active self-rotations are rarely studied in this context, although they can be relevant for active matter systems, as we illustrate by analyzing the motion of Chlamydomonas reinhardtii algae under different experimental conditions. Inspired by this example, we simulate the dynamics of a system of interacting active disks endowed with active torques. At low packing fractions, adhesion causes the formation of small rotating clusters, resembling those observed when algae are stressed. At higher densities, the model shows a jamming to unjamming transition promoted by active torques and hindered by adhesion. Our results yield a comprehensive picture of the dynamics of active rotators, providing useful guidance to interpret experimental results in cellular systems where rotations might play a role.

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Section: Introductionmentioning

confidence: 84%

“…Our work was inspired by the observation of a natural example of active rotators like C. reinhardtii. Quantification by image segmentation and PIV analysis shows that this kind of algae can not only self-rotate [6] but also aggregate forming collectively rotating clusters.…”

Section: Discussionmentioning

confidence: 99%

Unjamming of active rotators

Ravazzano¹,

Lionetti²,

Fumagalli³

et al. 2020

Preprint

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“…This micron-sized unicellular algae is able to self-propel to perform translational motion, but also has the ability to self-rotate [ 56 ]. Rotation is used to sense the direction of light to optimize efficiency of phototaxis [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

Deformable active nematic particles and emerging edge currents in circular confinements

Krause

Voigt

2022

Eur. Phys. J. E

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We consider a microscopic field theoretical approach for interacting active nematic particles. With only steric interactions the self-propulsion strength in such systems can lead to different collective behaviour, e.g. synchronized self-spinning and collective translation. The different behaviour results from the delicate interplay between internal nematic structure, particle shape deformation and particle–particle interaction. For intermediate active strength an asymmetric particle shape emerges and leads to chirality and self-spinning crystals. For larger active strength the shape is symmetric and translational collective motion emerges. Within circular confinements, depending on the packing fraction, the self-spinning regime either stabilizes positional and orientational order or can lead to edge currents and global rotation which destroys the synchronized self-spinning crystalline structure. Graphical abstract

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“…This micron-sized unicellular algae is able to self-propel to perform translational motion, but also has the ability to self-rotate [55]. Rotation is used to sense the direction of light to optimize efficiency of phototaxis [56]. The proposed microscopic field theoretical model can be extended towards various directions, e.g., hydrodynamic interactions.…”

Section: Discussionmentioning

confidence: 99%

Deformable active nematic particles and emerging edge currents in circular confinements

Krause¹,

Voigt²

2021

Preprint

View full text Add to dashboard Cite

We consider a microscopic field theoretical approach for interacting active nematic particles. With only steric interactions the self-propulsion strength in such systems can lead to different collective behaviour, e.g., synchronized self-spinning and collective translation. The different behaviour results from the delicate interplay between internal nematic structure, particle shape deformation and particle-particle interaction. For intermediate active strength an asymmetric shape emerges and leads to chirality and self-spinning crystals. For larger active strength the shape is symmetric and translational collective motion emerges. Within circular confinements, depending on the packing fraction, the self-spinning regime either stabilizes positional and orientational order or can lead to edge currents and global rotation which destroys the synchronized self-spinning crystalline structure.

show abstract

Reentrant Efficiency of Phototaxis in Chlamydomonas reinhardtii Cells

Cited by 20 publications

References 36 publications

Unjamming of active rotators

Unjamming of active rotators

Deformable active nematic particles and emerging edge currents in circular confinements

Deformable active nematic particles and emerging edge currents in circular confinements

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