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📰 "A developmental switch from capillary rectification to elastic catapult enables honeydew ejection in the spotted lanternfly"
https://arxiv.org/abs/2605.14957 #Physics.Flu-Dyn #Physics.Bio-Ph #Mechanics #Adhesion
A developmental switch from capillary rectification to elastic catapult enables honeydew ejection in the spotted lanternfly

Plant sap-feeding insects must dispose of excess fluid, yet at millimeter scales droplet release is constrained by capillary adhesion and contact-line pinning. How phloem-feeding insects solve this puzzle, particularly as the excretory apparatus changes in size and form from nymph to adult, has remained unclear. Combining micro-CT, high-speed imaging, measurements of honeydew properties, and reduced-order modeling, we show that the spotted lanternfly (Lycorma delicatula) uses distinct release mechanics across ontogeny. Nymphs release honeydew with an anal stylus that acts as a capillary rectifier, imposing a curvature asymmetry that biases the attached droplet toward detachment through a Laplace-pressure difference. Adults use a longer stylus associated with an elastic basal region, maintain stylus-droplet contact through a finite compression phase, and release droplets with greater translational and rotational momentum. In both stages, stylus rotation is ultrafast, with peak angular accelerations of order $10^7$ rad/s$^{-2}$ and release unfolding on millisecond timescales, yet droplet ejection speed remains below stylus tip speed. Weber-Bond scaling based on measured honeydew properties places both stages at $We_d<1$ and $Bo_d<1$ at the outlet, but distinguishes their post-release states: nymphal droplets remain surface-tension dominated, whereas adult droplets enter deformation- and spin-influenced regimes. Development therefore maintains waste clearance across ontogeny under the same outlet-scale capillary constraint by changing how stylus motion is coupled to the droplet at release, linking life-stage biomechanics to honeydew placement in this invasive phloem feeder and suggesting bioinspired strategies for droplet ejection, antifouling, and self-cleaning surfaces.

arXiv.org
📰 "Structural basis for the intestinal protocadherin-based intermicrovillar adhesion complex"
https://www.biorxiv.org/content/10.64898/2026.05.11.724279v1?rss=1 #Adhesion #Dynamics
📰 "Substrate mediated mechanical forces enable optimal kinetic proofreading by T-cell receptors"
https://www.biorxiv.org/content/10.64898/2026.05.12.724610v1?rss=1 #Mechanical #Adhesion #Force #Cell
📰 "Microbial GAIN domains undergo autoproteolysis and enable release of diverse cell surface associated proteins"
https://www.biorxiv.org/content/10.64898/2026.05.12.724683v1?rss=1 #Mechanical #Adhesion #Cell
📰 "Adhesion-mediated force transmission regulates cell competition in epithelia"
https://doi.org/doi:10.5802/crbiol.194
https://pubmed.ncbi.nlm.nih.gov/42126195/
#Adhesion #Force #Cell
Adhesion-mediated force transmission regulates cell competition in epithelia

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Votre #adhésion est d'abord un soutien politique, elle est essentielle pour renforcer les #associations citoyennes et soutenir leurs revendications.

🔴 Luttons pour la défense des libertés associatives ;
🔴 Agissons contre l’instrumentation des associations ;
🔴 Renforçons l’Observatoire Citoyen de la Marchandisation des Associations ;
🔴 Appelons à des soulèvements associatifs.
#adhésion #associations #asso #liberté #associatif

Collectif des Associations Citoyennes | HelloAsso

Le collectif des associations citoyennes est né en 2010 pour lutter contre l’instrumentalisation et la réduction des associations à leur seule dimension marchande et construire une société solidaire, écologique et participative. Notre histoire est retracée dans le livre des 10 ans.

HelloAsso
📰 "A Robust Biopolymer Network Binder for High-Loading Iodine Cathodes in Zinc-Iodine Batteries"
https://doi.org/doi:10.1002/adma.73339
https://pubmed.ncbi.nlm.nih.gov/42116719/
#Mechanical #Adhesion
📰 "Integrin-focal adhesion-cytoskeleton signaling axis variations and genetic susceptibility to SCD-CAD"
https://doi.org/doi:10.1016/j.forsciint.2026.112999
https://pubmed.ncbi.nlm.nih.gov/42114173/
#Dynamics #Adhesion #Cell
📰 "Cellular-scale mechanism of cell crawling responding to substrate stiffness"
https://arxiv.org/abs/2605.07109 #Physics.Bio-Ph #Cond-Mat.Soft #Mechanical #Adhesion #Cell
Cellular-scale mechanism of cell crawling responding to substrate stiffness

Biological cells are able to adapt their behaviour in response to environmental cues. Durotaxis is a phenomenon in which cells adjust their migration depending on the mechanical properties of a surrounding substrate. Although durotaxis has been studied more than two decades, basic cellular-scale mechanism of how cells regulate the motility responding to substrate stiffness remains to be elucidated. We address this issue by developing a theory utilising a mechanochemical model that integrates intracellular biochemical reactions with cellular deformation and substrate adhesion. Numerical analysis reveals that the characteristic speed and diffusion constant of cells change non-monotonically with respect to substrate stiffness, indicating the emergence of an optimal stiffness for migration. In addition, by introducing a memory effect that allows feedback from cell mechanics to the intracellular chemical reactions, the persistence time increases with substrate stiffness on a substrate softer than the optimal. We further investigate theoretically the origin of the non-monotonic dependence, that is comparable to the experimental observations, in terms of cell deformation and symmetry breaking in substrate adhesion. We believe that our study provides a unifying framework to understand complex durotactic cell migration.

arXiv.org