Mechanical Stretching
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Cooperative Conformational Transitions in Macromolecules under Mechanical Stretching. An Exactly Solved Model for Single Molecule Experiments
arXiv:2605.31462v1 Announce Type: cross Abstract: The stretching behavior of linear macromolecules undergoing conformational transitions is investigated. An exact solution is provided for a two-state system within the elastic freely jointed chain model. This minimal framework contains the smallest set of parameters required to describe such transitions: two Kuhn lengths, two elastic force constants, a free energy difference between both states and a nearest-neighbor interaction energy...
Cells have a built-in 'seatbelt' against sudden stress
Cells have a built-in 'seatbelt' against sudden stress Stephanie Baum Scientific Editor Robert Egan Associate Editor When cells experience sudden physical stress, like stretching or pressure, they can activate a fast, protective mechanism that shields their nuclei from destruction, according to a new study published in the Biophysical Journal. This mechanism could help scientists develop therapies to prevent DNA damage, a major driver of aging and cell death. "A lot of aging research has...
Dynamic terahertz wavefront control using stretchable single-walled carbon nanotube-based metasurfaces
Dynamic terahertz wavefront control using stretchable single-walled carbon nanotube-based metasurfaces Sadie Harley Scientific Editor Alexander Pol Deputy Editor The terahertz (THz) frequency regime, sitting between microwaves and infrared light, has long promised revolutionary advances in wireless communication, security imaging and nondestructive sensing. A key roadblock, however, has been the lack of compact, dynamically tunable components capable of manipulating THz beams on demand....
Turbulence: An Entropic Approach
arXiv:2606.03139v1 Announce Type: new Abstract: We show that maximizing the generalized entropic functional $S_{q,\delta}$ subject to standard kinetic energy constraints provides generalized canonical distributions that agree perfectly with measured probability densities of velocity differences at distance $r$ in highly-turbulent Taylor-Couette flow. The end point of the turbulent cascade is described by $\delta =\frac{3}{2}$, a parameter value that also plays an important role in black-hole...
Massive Spikes in LLMs are Bias Vectors: Mechanistic Uncovering and Spike-Free Quantization
arXiv:2606.02288v1 Announce Type: new Abstract: Massive activation spikes in Large Language Models (LLMs) severely degrade quantization by stretching dynamic ranges. While prior hypotheses characterize these as high-level scalar biases, we argue that they are merely the scalar intermediates of rigid, structural vector biases in the spike-carrying tokens. We show that these tokens converge to constant vectors after normalization that drive the attention sink and value-state drain mechanisms.
No need to stay positive: a practical approach to direct numerical simulations of elastic turbulence
arXiv:2606.09468v1 Announce Type: new Abstract: Successfully performing direct numerical simulations of polymeric flows remains a major challenge in computational fluid mechanics. In addition to the velocity field, such simulations must resolve polymeric degrees of freedom, often expressed via the conformation tensor, $\mathbf{c}$, which captures the local stretch of polymer molecules. A key difficulty here lies in maintaining the physical requirement $\mathrm{Tr}\, \mathbf{c}>3$, which is...
Zero-Poisson Ratio Elastomeric Substrates for Distortion-Free Stretchable Displays
arXiv:2606.03000v1 Announce Type: new Abstract: Stretchable displays are critical for emerging wearable electronics, soft sensors, and next-generation AR/VR interfaces. Although recent advances have enabled foldable, twistable, and rollable displays, intrinsically stretchable substrates often exhibit significant lateral contraction under tensile strain due to their high Poisson ratio, leading to unintended wrapping, distortion, and shrinkage. Here, we report a transparent...
The US Has a Plan to Combat Screwworm. It Involves a Lot More Flies
A flesh-eating parasitic fly that poses a major threat to livestock has returned to the United States after 60 years. This week, the US Department of Agriculture confirmed the presence of New World screwworm in a calf in southern Texas. Eliminated in the US in 1966 and as far south as Panama by 2006, its recent reemergence in Mexico made it likely that the screwworm would eventually enter the country again, with modeling showing that it could arrive as soon as summer 2025.
US cites forced labour concerns as grounds for new tariffs
US cites forced labour concerns as grounds for new tariffs USTR’s proposal comes from a Section 301 unfair trade practices investigation designed to help rebuild Donald Trump’s tariffs. The administration of US President Donald Trump has proposed new tariffs of up to 12.5 percent on imports from 60 economies after determining they had failed to curb trade in goods made with forced labour, an assertion that was rejected by US trading partners. The proposal from the Office of the United States...
A 'supereruption' transformed NZ 350,000 years ago—we now know how it happened
A 'supereruption' transformed NZ 350,000 years ago—we now know how it happened Lisa Lock Scientific Editor Andrew Zinin Lead Editor Some 350,000 years ago, the center of New Zealand's North Island appeared much different than the mountainous, scrub-covered landscape it is today. Amid a glacial period, temperatures were colder and conditions harsher.