@biosoftact

Bio-soft actuation @CNRS IUSTI, Aix-Marseille University

 Marseille, France
biosoftact.wordpress.com
Joined October 2018
  • Tweets338
  • Following535
  • Followers882
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Joel Marthelot retweeted
nature
@NatureJun 11
Ever since Charles Darwin proclaimed the carnivorous Venus flytrap one of the “most wonderful” plants in the world, scientists have been trying to work out how it snaps shut so quickly on its prey. A research team has now snapped a key piece of the puzzle in place. go.nature.com/4oktoRc

Revealed: how Venus flytraps snap shut with astonishing speed

Nature - Softening of the cells on the outermost surface of the trap lets the plant move at a breakneck pace.

nature.com
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The Venus flytrap is renowned for its ultrafast snap traps, which can capture insects in a fraction of a second. New research reveals that trap closure is triggered by a rapid softening of the epidermal cell walls, uncovering the physical mechanism behind this remarkable movement. Learn more this week in Science: scim.ag/4fG2Bg3
A Venus flytrap (Dionaea muscipula) leaf closes around a trapped fly. Photo: Alex Hyde/NPL/Minden Pictures

ALT A Venus flytrap (Dionaea muscipula) leaf closes around a trapped fly. Photo: Alex Hyde/NPL/Minden Pictures

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Advertisement for an advanced course in Udine, Italy 🇮🇹 this summer ☀️. Learn about mechanics for the fabrication and programming of soft robots 🦑. cism.it/en/activities/course… organized along with @biosoftact
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La mouche drosophile est capable de prouesses pour déployer ses ailes l.sciencesetavenir.fr/H7M

La mouche drosophile est capable de prouesses pour déployer ses ailes

l.sciencesetavenir.fr
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New preprint: arxiv.org/abs/2501.01875 "Dense array of elastic hairs obstructing a fluidic channel" Explanations below 🧵👇
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Joel Marthelot retweeted
Alain Schuhl@AlainSchuhl12 Dec 2024
Comment la mouche sortant de sa chrysalide déploie ses ailes en quelques minutes ? insis.cnrs.fr/fr/cnrsinfo/co… C'est un processus qui combine dépliement d'une structure et étirement du tissu cellulaire. @CNRSingenierie @CNRS Des recherches avec des applications dans le domaine des structures déployables ou de la robotique flexible
(a) Instantanés du déploiement des ailes de drosophile. (b) (i) Microtomographie par rayon-X des ailes pliées. (ii) Coupe transverse montrant les plis macroscopiques, la structure des veines (flèches blanches) et les piliers internes. (iii) Section perpendiculaire révélant l'organisation hexagonale des piliers. Le croquis résume la structure de l'aile : deux plaques reliées par des piliers organisés en réseau hexagonal. (c) Le sang, visualisé par des billes fluorescentes, est injecté dans toute l’aile au cours du déploiement. (d) Mesure de la pression interne d'un insecte. Le déploiement des ailes a lieu dans le segment grisé à une pression constante. © S. Hadjaje

ALT (a) Instantanés du déploiement des ailes de drosophile. (b) (i) Microtomographie par rayon-X des ailes pliées. (ii) Coupe transverse montrant les plis macroscopiques, la structure des veines (flèches blanches) et les piliers internes. (iii) Section perpendiculaire révélant l'organisation hexagonale des piliers. Le croquis résume la structure de l'aile : deux plaques reliées par des piliers organisés en réseau hexagonal. (c) Le sang, visualisé par des billes fluorescentes, est injecté dans toute l’aile au cours du déploiement. (d) Mesure de la pression interne d'un insecte. Le déploiement des ailes a lieu dans le segment grisé à une pression constante. © S. Hadjaje

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#RésultatScientifique 🔎 | Comment la mouche déploie ses ailes 🔬 @biosoftact @iustiumr7343 🤝 @univamu @CNRS 📍 @CNRS_dr12 🔬 @IBDMmarseille 🤝 @univamu @CNRS 📍 @CNRS_dr12 @CNRSbiologie insis.cnrs.fr/fr/cnrsinfo/co…
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Joel Marthelot retweeted
Takeuchi Lab@TakeuchiLabEN27 Nov 2024
Published in PNAS pnas.org/doi/10.1073/pnas.24… & press released! s.u-tokyo.ac.jp/en/press/105… “Researchers uncover what makes large numbers of “squishy” grains start flowing”
Takeuchi Lab@TakeuchiLabEN16 Apr 2024
A new preprint, "Squish jamming" arxiv.org/abs/2404.09773 We realized a model experiment of extremely deformable grains and found a novel fluid-solid transition. In contrast to usual jamming controlled by the number of contacts, our jamming is triggered by the "extent of contact".
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Volume 133, Issue 19 journals.aps.org/prl/issues/… Cover: Stitched photographs of a cylinder sequentially coated with curable elastomer while being rotated to grow stalactitelike elastomeric structures journals.aps.org/prl/issues/…
a circle with purple and blue bumps or peaks increasing in size depending on location, small peaks at 12 o'clock that increase in size in the clockwise direction so that the tallest peak is at 11:58.

ALT a circle with purple and blue bumps or peaks increasing in size depending on location, small peaks at 12 o'clock that increase in size in the clockwise direction so that the tallest peak is at 11:58.

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Painting a liquid polymer on an upside surface causes an array of drops to form. Painting successive layers after the previous ones have set causes the drops to grow into flexible fingers. The rubbery structures could prove useful in soft robotics. go.aps.org/3UGiwzP
A photograph of the flexible fingers of polymers that form when the polymer is repeatedly applied to an upside-down surface.

ALT A photograph of the flexible fingers of polymers that form when the polymer is repeatedly applied to an upside-down surface.

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When a coating on a surface is allowed to flow as it cures, an interplay of order and disorder driven by the Rayleigh-Taylor instability results in structures similar to some found in natural deposition processes Letter: go.aps.org/3UGmw39 Synopsis: go.aps.org/3UGiwzP
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Very happy to see our work on alginate foams (led by @MJouanlanne at Institut @CharlesSadron with TSP and MIM team members) highlighted on the cover of Advanced Materials Interfaces! Check it out here: onlinelibrary.wiley.com/toc/… @WileySTEM @Wiley_Chemistry @AdvPortfolio
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Fresh off the press: our work on elasto-active particles pnas.org/doi/10.1073/pnas.24… work by: @yx0892 @tomzinzin29 Richard Huang and @Trev_J_Jones nice story by @EPrinceton engineering.princeton.edu/ne… photo: Sameer A. Khan/Fotobuddy
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A new study models wing disc eversion in fruit flies and shows how active cell rearrangement allows the epithelial tissue to change shape. scim.ag/86m @ScienceAdvances
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Experiments on soft granular materials have allowed researchers to derive a rheological description for these materials by extending an established framework valid for hard granular materials Letter: journals.aps.org/prl/abstrac… Synopsis: physics.aps.org/articles/v17…
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The🪱 mania continues! In our last study lead by Rosa, we looked at the locomotion and dynamics of living worms (seen as active polymers) in porous environment made of 3D printed pillars arrays doi.org/10.48550/arXiv.2407.…
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ERC PhD Offer: Interested in better understanding how self-contracting vascular networks impact human health and bring innovative solutions for adaptive cooling and water management technologies? More info here: martinbrandenbourger.com/pub…

PhD offer | My Site

martinbrandenbourger.com
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Our paper on swimming active protein droplets is finally out! 🎊🎉 nature.com/articles/s41467-0… The main result is in the title: "Phase-separated droplets swim to their dissolution". Explanations below 🧵👇 @SoftLiv_Cornell @ETH_Materials @Cornell @CNRSingenierie @NatureComms
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A frictional soliton controls the resistance law of shear-thickening suspensions in pipes | PNAS | Alexis Bougouin, Bloen Metzger, Yoël Forterre, Pascal Boustingorry & Henri Lhuissier @iustiumr7343 pnas.org/doi/full/10.1073/pn…

A frictional soliton controls the resistance law of shear-thickening suspensions in pipes | PNAS

Pipe flows are commonly found in nature and industry as an effective mean of transporting fluids. They are primarily characterized by their resista...

pnas.org
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"Programming mechanics in knitted materials, stitch by stitch" (by Krishma Singal, Michael S. Dimitriyev, Sarah E. Gonzalez, A. Patrick Cachine, Sam Quinn & Elisabetta A. Matsumoto; in Nature Communications): link.springer.com/article/10…

Programming mechanics in knitted materials, stitch by stitch

Nature Communications - Knitted fabrics are prized for their stretchability, breathability, and long-wearability in everyday life. This study combines experiments and simulations to present a...

link.springer.com
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