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11,837 results for “Stress;”
Data from: Dynamic models for impact-initiated stress waves through snow columns
<p>The objective of this research is to model snow's response to dynamic, impact loading. Two constitutive relationships are considered: elastic and Maxwell-viscoelastic. These material models are applied to laboratory experiments consisting of 1000 individual impacts across 22 snow column configurations. The columns are 60 cm tall with a 30 cm by 30 cm cross-section. The snow ranges in density from 135-428 kg m<sup>-3</sup> and is loaded with both short-duration (~1 ms) and long-duration (~10 ms) impacts. The Maxwell-viscoelastic model more accurately describes snow's response because it contains a mechanism for energy dissipation, which the elastic model does not. Furthermore, the ascertained model parameters show a clear dependence on impact duration; shorter duration impacts resulted in higher wave speeds and greater damping coefficients. The stress wave's magnitude is amplified when it hits a stiffer material because of the positive interference between incident and reflected waves. This phenomenon is observed in the laboratory and modeled with the governing equations.</p>
Data from: The evolutionary genomics of adaptation to stress in wild rhizobium bacteria
<p>Microbiota comprise the bulk of life's diversity, yet we know little about how populations of microbes accumulate adaptive diversity across natural landscapes. Adaptation to stressful soil conditions in plants provides seminal examples of adaptation in response to natural selection via allelic substitution. For microbes symbiotic with plants however, horizontal gene transfer allows for adaptation via gene gain and loss, which could generate fundamentally different evolutionary dynamics. We use comparative genomics and genetics to elucidate the evolutionary mechanisms of adaptation to physiologically stressful serpentine soils in rhizobial bacteria in western North American grasslands. In vitro experiments demonstrate that the presence of a locus of major effect, the nre operon, is necessary and sufficient to confer adaptation to nickel, a heavy metal enriched to toxic levels in serpentine soil, and a major axis of environmental soil chemistry variation. We find discordance between inferred evolutionary histories of the core genome and nreAXY genes, which often reside in putative genomic islands. This suggests that the evolutionary history of this adaptive variant is marked by frequent losses, and/or gains via horizontal acquisition across divergent rhizobium clades. However, different nre alleles confer distinct levels of nickel resistance, suggesting allelic substitution could also play a role in rhizobium adaptation to serpentine soil. These results illustrate that the interplay between evolution via gene gain and loss and evolution via allelic substitution may underlie adaptation in wild soil microbiota. Both processes are important to consider for understanding adaptive diversity in microbes and improving stress-adapted microbial inocula for human use.</p>
Awareness of fifth metatarsal stress fractures among soccer coaches in Japan: A cross-sectional study
<p>Although a fifth metatarsal stress fracture is the most frequent stress fracture in soccer players, awareness of fifth metatarsal stress fractures among soccer coaches is unclear. Therefore, we performed an online survey of soccer coaches affiliated with the Japan Football Association to assess their awareness of fifth metatarsal stress fractures. A total of 150 soccer coaches were invited for an original online survey. Data on participants' age, sex, types of coaching licence, coaching category, types of training surface, awareness of fifth metatarsal stress fractures, and measures employed to prevent fifth metatarsal stress fractures were collected using the survey. Data from 117 coaches were analysed. Eighty-seven of the 117 coaches were aware of fifth metatarsal stress fractures; however, only 30% reported awareness of preventive and treatment measures for fifth metatarsal stress fractures. Licensed coaches (i.e., licensed higher than level C) were also more likely to be aware of fifth metatarsal stress fractures than unlicensed coaches were. Furthermore, although playing on artificial turf is an established risk factor for numerous sports injuries, soccer coaches who usually trained on artificial turf were more likely to be unaware of the risks associated with fifth metatarsal stress fractures than coaches who trained on other surfaces were (e.g., clay fields).<strong> </strong>Soccer coaches in the study population were generally aware of fifth metatarsal stress fractures; however, most were unaware of specific treatment or preventive training strategies for fifth metatarsal stress fractures. Additionally, coaches who practised on artificial turf were not well educated on fifth metatarsal stress fractures. Our findings suggest the need for increased awareness of fifth metatarsal stress fractures and improved education of soccer coaches regarding injury prevention strategies. </p>
Beyond a single temperature threshold: applying a cumulative thermal stress framework to plant heat tolerance
<p>Most plant thermal tolerance studies focus on single critical thresholds, which limit the capacity to generalise across studies and predict heat stress under natural conditions. In animals and microbes, thermal tolerance landscapes describe the more realistic, cumulative effects of temperature. We tested this in plants by measuring the decline in leaf photosynthetic efficiency (F<sub>V</sub>/F<sub>M</sub>) following a combination of temperatures and exposure times, then modelled these physiological indices alongside recorded environmental temperatures. We demonstrate that a general relationship between stressful temperatures and exposure durations can be effectively employed to quantify and compare heat tolerance within and across plant species and over time. Importantly, we show how F<sub>V</sub>/F<sub>M</sub> curves translate to plants under natural conditions, suggesting that environmental temperatures often impair photosynthetic function. Our findings provide more robust descriptors of heat tolerance in plants and suggest that heat tolerance in disparate groups of organisms can be studied with a single predictive framework.</p>
KupferDigital mechanical testing datasets: Stress relaxation and low-cycle fatigue (LCF) tests
<p><span>The Kupfer<em>Digital</em> project deals with the development of a data ecosystem for digital materials research on the basis of ontology-based digital representations of copper and copper alloys. This document provides exemplary mechanical testing datasets for training the developed Kupfer<em>Digital</em> infrastructures. Different types of cast copper alloys were provided for this research and their mechanical testing (stress relaxation and low-cycle fatigue) was performed in the accredited materials testing laboratory, while the test results were reported according to the DIN/ISO standards and attached with the maximum possible metadata about the sample history, equipment, and calibration. The attached content file consisted of the obtained primary raw testing data as well as the secondary datasets of these tests containing the detailed metadata of mechanical testing methods. Such test data files are processed by the Kupfer<em>Digital</em> digital tools to be converted to standardized machine-readable data files.</span></p>
Mediterranean Sea, NEMO4.2 / WW3 uncoupled and coupled surface: stress, currents and Stokes Drift
<pre>The NEMO version 4.2 has been updated to include new processes related to wave-current interactions. <br>A set of sensitivity experiments are performed using the hydrodynamic model, NEMO v4.2 standalone and coupled with <br>the spectral wave model WaveWatchIII (WW3) v6.07 through the OASIS library. <br><br>The configuration is based on the operational Copernicus Marine Service Mediterranean forecasting physical system (MedFS). <br>Both models are implemented at 1/24° resolution and are forced by ECMWF 1/10° horizontal resolution atmospheric fields.<br><br>Two-year (2019-2020) numerical experiments are carried out in both uncoupled and 1 way coupled mode.<br>This dataset contains the NEMO output of the daily surface fields for the surface stress, the surface currents <br>and the Stokes drift for the uncoupled and coupled experiments. <br>This dataset was created in the context of the IMMERSE H2020 project.</pre>
Student Stress Resilience app first efficacy study
<p>Experimental group students (n=25) used the SSResilience app for two weeks. Control group students (n=50) used different means to set goals. All students were pre-tested and post-tested on anxiety, well-being and resilience using standardized questionnaires.</p>
Leaf fluctuating asymmetry is not a reliable indicator of stress
<p>Stress experienced during development in organisms with bilateral structures could result in developmental instability, which is expressed as subtle non-directional deviations from perfect symmetry, known as fluctuating asymmetry (FA). As such, FA has been proposed, and extensively used, as a trait indicating stress for many organisms with bilateral structures and many types of stress. However, while this concept may apply to animals, the evidence for plants' main vegetative structures, i.e., leaves, remains equivocal, and a comprehensive synthesis on this topic is still missing.</p> <p>We designed observational field and controlled greenhouse studies, combining different growth and leaf forms across multiple stress gradients, comprising 21 species and 80 populations. We measured FA as the difference between the left and right area of the leaf, an approach that accommodates diverse leaf forms. We used high-precision, blind, single-person measurements and tested for other forms of symmetry and the effect of leaf size. We further complemented our study with a systematic literature review of FA in plant leaves, compiling 51 studies comprising 72 species, 23 stress types, and 131 unique entries (species × stress type). </p> <p>We consistently found no effect of stress on leaf FA in any of the studied species in both our field and experimental gradients. In the systematic literature review, only 39% of the unique entries showed the expected increase in FA with stress, 53% showed no effect, 9% showed an opposite trend of a decrease in FA with stress, and 1% showed an unimodal relationship. Importantly, only 40% of all entries fulfilled the crucial step of controlling for a high-precision measurement, and of these 49% reported the expected increase of FA with stress. </p> <p>Both the results of our observational and experimental approaches and the systematic literature review failed to support a clear relationship between stress and FA in plant leaves. These results clearly show that FA in plant leaves cannot be used as a reliable trait indicating stress during development.</p>
Hellenistic-Roman bioarchaeological mechanical stress data - MetaMobility project
<p>This database covers the bioarchaeological data we could extract on Hellenistic-Roman period <span>skeletal markers of mechanical stress</span> in the Central and Eastern Mediterranean and Middle East. <span>Specifically, it covers degenerative joint disease (osteoarthritis) in the major appendicular joints of the skeleton, intervertebral disc disease (spinal arthritis on the vertebral bodies and apophyseal joints), Schmorl's nodes and entheseal changes.</span> The database was created as part of the MetaMobility project (EXCELLENCE/0421/0376), which is implemented under the programme of social cohesion “THALIA 2021-2027” cofunded by the European Union, through the Research and Innovation Foundation.</p> <p> </p> <p><span> </span></p>
Hellenistic-Roman bioarchaeological physiological stress data - MetaMobility project
<p>This database covers the bioarchaeological data we could extract on Hellenistic-Roman period physiological stress markers in the Central and Eastern Mediterranean and Middle East. Specifically, it covers cases of cribra orbitalia, porotic hyperostosis, enamel hypoplasia and periostitis. The database was created as part of the MetaMobility project (EXCELLENCE/0421/0376), which is implemented under the programme of social cohesion “THALIA 2021-2027” cofunded by the European Union, through the Research and Innovation Foundation.</p>
Supplemental Material to Doctoral Thesis "Engineering approach for predicting tunneling crack initiation in trailing-edge adhesive joints of wind turbine blades under mechanical fatigue and thermal residual stresses"
<p>This set supplements the figure data to the doctoral thesis "Engineering approach for predicting tunneling crack initiation in trailing-edge adhesive joints of wind turbine blades under mechanical fatigue and thermal residual stresses", DOI: <a href="https://doi.org/10.14279/depositonce-19144">10.14279/depositonce-19144</a></p>
Lateral Root Development in Two Tomato Accessions under Salt Stress
<p>The images of growing tomato seedlings were collected using SPIRO setup by Maryam Rahmati-Ishka every 30 minutes. However, as our automated script did not work for quantifying the lateral roots, Magda Julkowska traced the roots manually - for images collected every 60 minutes. </p> <p>The data was collected over 4 experiments, for two tomato genotypes: M248 - S. pimpinellifolium - wild tomato - salt tolerant - maintains the LR emergence under salt stress; and LA1511 - S. lycopersicum - cultivated tomato - salt tolerant - maintains the LR elongation under salt stress. </p>
Data from: Physiological effects of interacting native and invasive bivalves under thermal stress
<p>Across many ecosystems in North America and Europe, native freshwater bivalves (Order Unionida) are threatened by fouling and competition for food by the invasive zebra mussel <em>Dreissena polymorpha</em>. In light of climate change, knowledge on the influence of water temperature on these competitive effects is important, yet poorly understood. This study examines the physiological impact of the interaction between <em>D. polymorpha</em> and the native European unionid <em>Anodonta cygnea</em> over a 28-day period in response to water temperatures of 12, 19, and 25 °C by comparing their glycogen, glucose, lipid, and protein concentrations. The laboratory experiment comprised three treatments: (1) fouling of <em>A. cygnea</em> by <em>D. polymorpha</em>, (2) both species present but not fouling; and (3) a control in which <em>A. cygnea</em> and <em>D.</em> <em>polymorpha</em> were placed separately. Increased water temperatures caused physiological stress in <em>D. polymorpha</em> as evident from reduced glycogen, glucose, lipid, and protein concentrations. <em>Dreissena polymorpha</em> benefited from fouling of unionids, as individuals that fouled <em>A. cygnea</em> tended to have increased glycogen, glucose, lipid and protein concentrations. Competitive effects of <em>D. polymorpha</em> over the unionid bivalve species, however, were not intensified by elevated temperatures. Glochidia release, lower infestation intensity, and physiological stress of <em>Dreissena </em>at higher temperatures were likely confounding factors. The results of this study suggest that understanding the physiological consequences of species interactions at changing temperatures can be an important tool to assess future climate change impacts on freshwater bivalves and aquatic community structures.</p>
Repository of "How Stress Biaxiality Controls Crack Morphology and Apparent Fracture Energy of Dikes and Sills"
<p>This repository contains the dataset of the future publication "How Stress Biaxiality Controls Crack Morphology and Apparent Fracture Energy of Dikes and Sills". It contains:</p> <ul> <li>1 file recapitulating sample dimensions and informations on the tests.</li> <li>12 “raw” mechanical results of experiments on Carrara marble (6 WST — 3 dry/3 saturated tests, 6 MRT — 3 dry/3 saturated tests) with minimal filtering.</li> <li>12 “computed” mechanical results of experiments on Carrara marble (6 WST — 3 dry/3 saturated tests, 6 MRT — 3 dry/3 saturated tests) with the use of the compliance method.</li> <li>2 compressed and stitched back-scattered SEM scans imaging the crack tip in xz direction after crack arrest on WST and MRT.</li> <li>5 stitched back-scattered SEM scans imaging the crack in yz direction on WST at 20, 40, 60 mm MRT at 10, 25 mm of crack propagation.</li> </ul> <p>For more details and information about the dataset, do not hesitate to contact me at antoine.guggisberg@epfl.ch</p> <p> </p>
Supplemental Material for "Anomalous Shear Stress Variation in Wet Granular Medium: Implications for Landslide Lateral Faults"
<p>Dataset and Constrained Parameters for "<strong><em>Anomalous Shear Stress Variation in Wet Granular Medium: Implications for Landslide Lateral Faults</em></strong>" by Chang et al.</p> <p>This dataset comprises 64 rheological experiments, which have been encapsulated in four experimental groups: Full Height, Half Height, Half Height & Load, and Ethanol-Water. </p> <p>The experiments were conducted using a double-cylinder geometry on three-phase granular media to simulate the lateral faults of slow-moving landslides. The dataset includes Mechanical Data for time-evolution measurements of shear stress, fluid volume fraction under varying conditions, and Image Data for velocity fields derived from PIV (Particle Image Velocimetry) analysis.</p> <p>In addition, it provides constrained parameters, such as steady-state shear stress and the characteristics of the flow structure.</p> <p>Article information:</p> <div> <div>Chang, C., Ohno, K., Schulz, W. H., & Yamaguchi, T. (2025). Anomalous Shear Stress Variation in Wet Granular Medium: Implications for Landslide Lateral Faults. <em>Geophysical Research Letters</em>, <em>52</em>(7), e2024GL113816. <a href="https://doi.org/10.1029/2024GL113816">https://doi.org/10.1029/2024GL113816</a></div> </div>
Sex-specific fear acquisition following early life stress is linked to amygdala and hippocampal purine and glutamate metabolism
<p>Motion tracking dataset used for the paper "<strong><em>Sex-specific fear acquisition following early life stress is linked to amygdala and hippocampal purine and glutamate metabolism</em></strong>", by Joeri Bordes et al.</p> <p><strong><span>Abstract</span></strong></p> <p>Early life stress (ELS) can negatively impact health, increasing the risk of stress-related disorders, such as post-traumatic stress disorder (PTSD). Importantly, PTSD disproportionately affects women, emphasizing the critical need to explore how sex differences influence the genetic and metabolic neurobiological pathways underlying trauma-related behaviors. This study uses the limited bedding and nesting (LBN) paradigm to model ELS and investigate its sex-specific effects on fear memory formation. Employing innovative unsupervised behavioral classification, the current study reveals distinct behavioral patterns associated with fear acquisition and retrieval in male and female mice following ELS. Females exposed to LBN display heightened active fear responses, contrasting with males. Furthermore, the study examined the crucial link between behavioral regulation and cellular metabolism in key brain regions involved in fear and stress processing. Sex-specific and stress-dependent alterations were observed in purine, pyrimidine, and glutamate metabolism within the basolateral amygdala, the dorsal hippocampus, and the ventral hippocampus. These findings provide crucial insights into the complex interplay between metabolic pathways, the neurobiological underpinnings of fear memory, and stress responses. Importantly, they emphasize the significance of considering sex-specific metabolic alterations when investigating stress-related disorders, opening potential avenues for the development of targeted interventions.</p>
Mitochondrial oxidant stress promotes alpha-synuclein aggregation and spreading in mice with mutated glucocerebrosidase
<p>These are the data sets and plasmid sequences of the viral vectors used in the study "Mitochondrial oxidant stress promotes alpha-synuclein aggregation and spreading in mice with mutated glucocerebrosidase"</p>
Carmichael_etal_Data_Analysis_All_Stress_Responses
<p>Data for the submission "Reconciling variability in multiple stressor effects using environmental performance curves". This includes growth rate data for 12 bacterial taxa exposed to gradients of temperature, pH and salinity. </p> <p>The R script for the data analysis pipeline is included, as well as a README file describing the data layout.</p>
Linear contraction of stress fibers generates cell body rotation
<p>Raw image data and numerical data used to generate plots and graphs included in the manuscript. Raw sequential images to make supplementary movies.</p>
Experimental dataset on basal stresses and seismic signals generated by granular flows moving on a 3D-printed bumpy substrate
<p>This dataset provides the data supporting the experimental study of granular flows moving on a 3D-printed bumpy substrate considering the response of basal stresses and seismic signatures.</p> <p>S1_video clips_the side-view of the kinematic behaviors of the granular flows tracked by a high-speed camera.</p> <p>S2_data_stress and seismic signals measured at the instrumented plate</p> <p>S3_data_example of velocity fields downstream and normal to the base<br>S4_data_propagation features of the flow characterized by basal stresses and seismic signals<br>S5_data_variations of the depth-averaged velocity of the granular flows and corresponding nondimensionalized downslope velocity profiles<br>S6_data_profiles of the velocity of the granular flows normal to the base along with their depth-averaged velocities in the basal layers<br>S7_data_ nondimensionalized shear rates of the granular flows for various particle diameters <br>S8_data_depth-averaged shear rates and corresponding inertial numbers for granular flows with different particle sizes<br>S9_data_the mean normal stress and shear stress and stress fluctuations normal and tangential to the base<br>S10_data_characteristics of seismic signals in terms of peak amplitude, mean envelope, seismic deviation factor, and the signal mean frequency<br>S11_data_effective basal friction coefficient and equivalent friction coefficient as functions of particle diameter<br>S12_data_relationships between nondimensionalized normal stress fluctuations and nondimensionalized basal vertical velocity, inertial number, effective basal friction coefficient and equivalent friction coefficient of the flows.<br>S13_data_seismic deviation factor as functions of nondimensionalized normal stress fluctuations, inertial number, effective basal friction coefficient and equivalent friction coefficient</p> <p>S14_data_Comparison of effective basal friction coefficient μ_b and that scaled by the nondimensionalized basal vertical velocity.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.