#SoftMatter have just published the results of a project that Renato Assante, Davide Marenduzzo, Alexander Morozov, and I recently worked on together! What did we do and what’s new? Briefly…

#Microswimmer suspensions behave in a similar way to fluids containing kinesin and microtubules. Both systems can be described by the same system of three coupled nonlinear #PDEs.

A #LinearStabilityAnalysis of these equations suggests that variations in concentration across the system don’t significantly affect emergent #phaseBehaviour. How then can we explain #experiments that show visible inhomogeneities in #microtubule–#kinesin mixtures, for instance?

With increasing activity, we move away from the quiescent regime, past the onset of #SpontaneousFlow, and deeper into the active phase, where #nonlinearities become more important. What role do concentration inhomogeneities play here?

We investigated these questions, taking advantage of the #openSource #Dedalus #spectral framework to simulate the full nonlinear time evolution. This led us to predict a #novel regime of #spontaneous #microphaseSeparation into active (nematically ordered) and passive domains.

Active flow arrests macrophase separation in this regime, counteracting domain coarsening due to thermodynamic coupling between active matter concentration and #nematic order. As a result, domains reach a characteristic size that decreases with increasing activity.

This regime is one part of the #PhaseDiagram we mapped out. Along with our other findings, you can read all about it here!

low #ReynoldsNumber #turbulence #ActiveTurbulence #CahnHilliard #ActiveMatter #NavierStokes #BerisEdwards #CondensedMatter #PhaseTransitions #TheoreticalPhysics #BioPhysics #StatisticalPhysics #FluidDynamics #ComputationalPhysics #Simulation #FieldTheory #paperthread #NewPaper #science #research #ActiveGel #activeNematic #analytic #cytoskeleton #hydrodynamics #MPI #theory

#SoftMatter have just published the results of a project that Renato Assante, Davide Marenduzzo, Alexander Morozov, and I recently worked on together! What did we do and what’s new? Briefly…

The #hydrodynamic behaviour of inhomogeneous #activeNematic gels (such as extensile bundles of #cytoskeletal filaments or suspensions of low #ReynoldsNumber swimmers) can be described by the time evolution of three coupled #PDEs.

Standard #ActiveGel #theory concludes, from a #LinearStabilityAnalysis of these equations, that fluctuations in concentration don’t significantly affect emergent #phaseBehaviour. However, this leaves #experimental #observations of visible inhomogeneities in #microtubule–#kinesin mixtures unexplained. As we move away from the passive (quiescent) regime, past the onset of #SpontaneousFlow, and deeper into the active phase, #nonlinearities become more important. What role do concentration inhomogeneities play here?

Alongside #analytic techniques, we used an in-house #MPI-parallel code developed within the #Dedalus #spectral framework to investigate. We predict a #novel regime of #spontaneous #microphaseSeparation into active (nematically ordered) and passive domains. In this regime, active flow arrests macrophase separation, which is itself driven by the thermodynamic coupling between active matter concentration and #nematic order. As a result, domains do not #coarsen past a typical size, which decreases with increasing activity. This regime is one part of the #PhaseDiagram we mapped out.

Along with our other findings, you can read all about it here!

#CahnHilliard #ActiveMatter #NavierStokes #BerisEdwards #CondensedMatter #PhaseTransitions #TheoreticalPhysics #BioPhysics #StatisticalPhysics #FluidDynamics #ComputationalPhysics #Simulation #FieldTheory #paperthread #NewPaper #science #research

#lemonde #pixels "Fuite de données médicales de 500 000 Français : l'entreprise Dedalus condamnée à 1,5 million d'euros d'amende" #ViePrivée #Données #DonnéesMédicales #Santé #Dedalus ... https://www.lemonde.fr/pixels/article/2022/04/21/fuite-de-donnees-medicales-de-500-000-francais-l-entreprise-dedalus-condamnee-a-1-5-million-d-euros-d-amende_6123085_4408996.html

#lemonde #pixels "Fuite de données médicales de 500 000 Français : l'entreprise Dedalus condamnée à 1,5 million d'euros d'amende" #ViePrivée #Données #DonnéesMédicales #Santé #Dedalus ... https://www.lemonde.fr/pixels/article/2022/04/21/fuite-de-donnees-medicales-de-500-000-francais-l-entreprise-dedalus-condamnee-a-1-5-million-d-euros-d-amende_6123085_4408996.html

#Dedalus France (Biologie) : la #CNIL sanctionne la fuite de données de Février 2021 à hauteur de 1,5 M d’euros !

https://blog.sosordi.net/2022/04/dedalus-france-biologie-la-cnil-sanctionne-la-fuite-de-donnees-de-fevrier-2021-a-hauteur-de-15-m-deuros.html

#securite #Loi #data #vieprivee

Non mais allô quoi !?

Vous savez la #faille des 500000 patients français divulgués avec des informations très sensibles ??

Ben y a eu un lanceur d'alerte de cette boite trouée qui a été viré pour faute grave !!

https://www.rue89strasbourg.com/strasbourg-dedalus-licencie-lanceur-alerte-protection-donnees-sante-192312

#Dedalus