Theory of Cell Body Lensing and Phototaxis Sign Reversal in "Eyeless" Mutants of ChlamydomonasChlamydomonas

This paper presents a quantitative theory explaining how the spherical cell body of "eyeless" *Chlamydomonas* mutants acts as a lens to create internal caustics, causing a phototaxis sign reversal because the flagellar response is dominated by the rapidly varying lensed signal rather than the direct illumination.

Sumit Kumar Birwa, Ming Yang, Adriana I. Pesci, Raymond E. GoldsteinThu, 12 Ma🧬 q-bio

Chaos-generating periodic orbits of topological defects in confined active nematics

This study reveals that confined active nematics can transition from chaotic flows to ordered, periodic dynamics through stable orbits of +1/2+1/2 disclinations, where the specific "braid" patterns (such as "golden" and "silver" braids) emerge from a balance between the number of defects and flow vortices under strong confinement.

Brandon Klein, Alejandro J. Soto Franco, Md Mainul Hasan Sabbir, Matthew J. Deutsch, Ross Kliegman, Robin L. B. Selinger, Kevin A. Mitchell, Daniel A. BellerMon, 09 Ma🔬 cond-mat

All-water supercapacitor enabled by 1-nm clay channels

This paper presents a scalable, all-water supercapacitor ("blue capacitor") constructed from abundant clay and graphene that utilizes 1-nm nanoconfined water as a sole electrolyte to achieve high voltage stability, near-perfect efficiency, and exceptional cycle life.

Vasily Artemov, Svetlana Babiy, Yunfei Teng, Jiaming Ma, Alexander Ryzhov, Tzu-Heng Chen, Lucie Navratilova, Victor Boureau, Pascal Schouwink, Mariia Liseanskaia, Patrick Huber, Fikile Brushett, Lyesse Laloui, Giulia Tagliabue, Aleksandra RadenovicMon, 09 Ma🔬 cond-mat

Molecular insight on ultra-confined ionic transport in wetting films: the key role of friction

Using molecular dynamics simulations and a validated one-dimensional theoretical framework, this study reveals that ion adsorption at the water-silica interface generates molecular-scale roughness and additional friction, significantly increasing apparent viscosity and governing ultra-confined ionic transport in wetting films.

Aymeric Allemand, Anne-Laure Biance, Christophe Ybert, Laurent JolyMon, 09 Ma🔬 physics

Confined drying of a binary liquid mixture droplet: A quantitative interferometric study under humidity control

This study presents a robust quantitative framework combining Mach-Zehnder interferometry with humidity-controlled confinement to precisely map the drying kinetics and internal concentration fields of water-glycerol droplets, successfully validating a diffusion-controlled evaporation model and extracting concentration-dependent transport properties while confirming that mass diffusion dominates over buoyancy-driven convection.

Ole Milark, Jean-Baptiste Salmon, Benjamin SobacMon, 09 Ma🔬 physics

Shape-Independent Fluidization in Epithelial Cell Monolayers

This study challenges the prevailing geometric paradigm of epithelial fluidization by demonstrating that reducing cell-cell adhesion can trigger a shape-independent transition to a fluid state, necessitating a revised theoretical model that accounts for adhesion's dual role in both interfacial energy and kinetic viscous drag.

Pradip K. Bera (Department of Mechanical Engineering, University of Wisconsin - Madison, Madison, WI, USA), Anh Q. Nguyen (Department of Physics, Northeastern University, Boston, MA, USA, Center for Theoretical Biological Physics, Northeastern University, Boston, MA, USA), Molly McCord (Department of Mechanical Engineering, University of Wisconsin - Madison, Madison, WI, USA, Biophysics Program, University of Wisconsin - Madison, Madison, WI, USA), Dapeng Bi (Department of Physics, Northeastern University, Boston, MA, USA, Center for Theoretical Biological Physics, Northeastern University, Boston, MA, USA), Jacob Notbohm (Department of Mechanical Engineering, University of Wisconsin - Madison, Madison, WI, USA, Biophysics Program, University of Wisconsin - Madison, Madison, WI, USA)Mon, 09 Ma🔬 physics

Absolute negative mobility in a one-dimensional overdamped system driven by active fluctuations

This paper demonstrates that absolute negative mobility, a paradoxical phenomenon where a system moves opposite to an applied force, can occur in a minimal one-dimensional overdamped system driven by active Poisson shot noise within a symmetric periodic potential, offering new insights into biological transport and microscopic separation strategies.

K. Białas, P. Hänggi, J. SpiechowiczMon, 09 Ma🔬 cond-mat.mes-hall