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978 results for “instabilities”
Figure 2 in Systematics, variation, and developmental instability: analysis of spine patterns in ancestrulae of a common bryozoan
Figure 2. Some common spine pattern formulae and views of the frontal membrane of ancestralae of Bugula stolonifera. All spine patterns are recorded from the viewpoint of the ancestrula right:left:proximal. (A) Diagram of an ancestrula with the typical 3:3:1 spine pattern cited in the text; (B) 3:3:0 variant spine pattern resulting from a loss of the proximal spine: this spine pattern was the most abundant variant spine pattern accounting for 54% of the variant spine patterns; (C) 3:2:1 variant spine pattern resulting from a loss on the left distal margin; (D) 4:3:1 variant spine pattern resulting from a spine gain on the right distal margin.
Mechanical dataset for nanometric flow and earthquake instability
<p>Mechanical data of rock deformation experiments in:</p> <p>Nanometric flow and earthquake instability</p> <p>MATLAB codes are also provided to reproduce related figures in the paper.</p> <p>---------------------------------------------------------------------------<br> By Hongyu Sun and Matej Pec</p> <p>Department of Earth, Atmospheric and Planetary Sciences<br> Massachusetts Institute of Technology</p> <p>* Corresponding Authors: hongyus@mit.edu, mpec@mit.edu</p>
Representation of submesoscale baroclinic instabilities in ROMS and MPAS-O
<h2>Idealized Model Outputs</h2> <p>This dataset archive contains a subset of the model outputs that are necessary for reproducing the analyses presented in the accompanying manuscript. The datasets correspond to either the MPAS-O or ROMS ocean models at resolutions ranging from 10 km to 100 m. Velocity and corresponding invariant (vorticity/divergence) variables and tracer variables are saved here with only their surface values. Additionally, all variables except those required to compute kinetic energy time series over the simulation period are only saved for a time window that corresponds to the shaded region in Figure 4 of the accompanying manuscript. Some grid metric variables necessary for MPAS-O calculations are also included within "MPAS-O_Initial_*.nc" files. There are two zipped tar directories (mpaso_winds.tar.gz and roms_winds.tar.gz) containing the outputs of all wind stress sensitivity tests needed to recreate the results shown in Figure 2. All datasets are saved in NetCDF format.</p>
VISION Invited lecture - Genomic instability, microenvironment and telomere homeostasis in colorectal cancer
<p>Recording and presentation of the invited lecture that took place online on 4 November 2021 - <strong>Pavel Vodička, MD, Ph.D. - Genomic instability, microenvironment and telomere homeostasis in colorectal cancer.</strong></p> <p>Pavel Vodicka<sup>1,2,3</sup>, Sona Vodenkova<sup>1</sup>, Michal Kroupa<sup>1,3</sup>, Alena Opattova<sup>1,2,3</sup>, Kristyna Tomasova<sup>1,3</sup>, Ludmila Vodickova<sup>1,2,3</sup></p> <p><sup>1</sup> Institute of Experimental Medicine, Czech Acad. Sci., Videnska 1083, Prague 4, Czech Rep.</p> <p><sup>2</sup> Inst. Biology and Med. Genet., 1st Faculty of Medicine, Charles University, Albertov 6, Prague 2, Czech Rep.</p> <p><sup>3</sup> Biomedical Center, Faculty of Medicine in Pilsen, Charles University Prague, Pilsen, 30100, Czech Rep.</p> <p>Colorectal cancer (CRC) continues to be one of the leading malignancies and causes of tumour-related deaths worldwide. Both impaired DNA repair mechanisms and disrupted telomere length homeostasis represent potential culprits in CRC onset, its dissemination in the body and prognosis. Above parameters are becoming critical as prognostic markers, since CRC therapy is based on compounds interacting with DNA. DNA repair capacity in CRC patients have recently been studied in order to address prediction of therapy response. Due to the substantial interindividual variations in DNA repair capacities and relative telomere length, these markers may pose a possible contribution in individualized therapeutical regimen of CRC patients. Telomere attrition, responsible for replicative senescence in healthy cells, may become a hallmark of malignant transformation of the cell due to by-passing cell cycle checkpoints. Telomerase – a key enzyme keeping homeostasis of telomere - is almost ubiquitous in advanced solid cancers, including CRC, and its expression is fundamental to cell immortalization.<br> Here we present our data based on the investigation of base excision repair capacities and relative telomere length in tumor tissues and adjacent non-malignant mucosa of sporadic CRC patients. The relative gene expression of telomerases is monitored as well. Particular attention will be dedicated to the CRC phenotypes and clinicopathological characteristics. We also addressed telomere homeostasis in peripheral blood lymphocytes of CRC patients in several consecutive samplings (at diagnosis, immediately after treatment and in additional follow-up intervals), which could provide us the insight into the treatment response. This aspect is of particular relevance, since there is currently a persistent effort to develop therapeutics, which are telomerase-specific and gentle to non-malignant tissue. However, in practice, we are at the dawn of clinical trials. Additionally, emerging crosstalks between DNA repair and telomere length homeostasis may cast some lights on a dynamic of genomic instability, a fundamental hallmark (or cause) of cancer.</p> <p>Acknowledgement: GACR 21-04607X, 19-10543S, AZV NV18/03/00199</p>
Data files for Atmospheric Gravity Wave and Instability Observations from the International Space Station using the Near InfraRed Airglow Camera (NIRAC)
<p>The files in this set are data obtained from the NIRAC airglow imager on the International Space Station. The files are named for a JGR paper by J. Hecht et al. entitled Atmospheric Gravity Wave and Instability Observations from the International Space Station using the Near InfraRed Airglow Camera (NIRAC). These files are for plots in Figures 5,7,10,11,17,18, and 19 in the submitted paper. The files are published here so as to be available for review. This paper should appear in JGR Atmospheres sometime in late 2023 or early 2024. The files that are text files are meant to be read with IDL as discussed in the readme file. </p>
Group augmentation underlies the evolution of complex sociality in the face of environmental instability
<p class="MsoNormalCxSpFirst">Although kin selection is assumed to underlie the evolution of sociality, many vertebrates—including nearly half of all cooperatively breeding birds—form groups that also include unrelated individuals. Theory predicts that despite reducing kin structure, immigration of unrelated individuals into groups can provide direct, group augmentation benefits, particularly when offspring recruitment is insufficient for group persistence. Using population dynamic modelling and analysis of long-term data, we provide clear empirical evidence of group augmentation benefits favoring the evolution and maintenance of complex societies with low kin structure and multiple reproductives. We show that in the superb starling (<em>Lamprotornis superbus</em>)—a plural cooperative breeder that forms large groups with multiple breeding pairs, and related and unrelated non-breeders of both sexes—offspring recruitment alone cannot prevent group extinction, especially in smaller groups. Further, smaller groups, which stand to benefit more from immigration, exhibit lower reproductive skew for immigrants, suggesting that reproductive opportunities as joining incentives lead to plural breeding. Yet, despite a greater likelihood of becoming a breeder in smaller groups, immigrants are more likely to join larger groups where they experience increased survivorship and greater reproductive success as breeders. Moreover, immigrants form additional breeding pairs, increasing future offspring recruitment into the group and guarding against complete reproductive failure in the face of environmental instability and high nest predation. Thus, plural breeding likely evolves because the benefits of group augmentation by immigrants generate a positive feedback loop that maintains societies with low and mixed kinship, large group sizes, and multiple reproductives.</p>
Probabilistic Estimates of Convective Instability in Individual MRO-MCS Temperature Retrievals
<p>Heavens, Nicholas G. (2023), “Probabilistic Estimates of Convective Instability in Individual MRO-MCS Temperature Retrievals”, Zenodo, V1, doi: 10.5281/zenodo.7828010.</p> <p> </p> <p><strong>Title:</strong> Probabilistic Estimates of Convective Instability in Individual MRO-MCS Temperature Retrievals</p> <p> </p> <p><strong>Author:</strong> Nicholas G. Heavens, Space Science Institute, Boulder, CO, USA and London, UK (nheavens@spacescience.org)</p> <p> </p> <p>Date: 15 April 2023</p> <p> </p> <p><strong>Overview</strong>: This dataset contains analyses of convective instabilities in individual MRO-MCS temperature profiles for a manuscript currently under review at the <em>Planetary Science Journal</em>.</p> <p> </p> <p>Averaged data products based on these analyses already have been archived as Heavens (2022):</p> <p> </p> <p>The data products are estimates of the probability of convective instability derived from diagnosis of convective instability in retrieved temperature profiles from Mars Climate Sounder on board Mars Reconnaissance Orbiter (MRO-MCS)</p> <p> </p> <p>If you are using this dataset and are feeling confused or wish there were some additional information from the article in this dataset, please contact me. A complete account of the contents and a restatement of this description is included as MCS_CONVINST_INDFILE_SURVEY_DESC.PDF</p> <p> </p> <p>Acknowledgments: The archiving of this dataset is supported by NASA’s Mars Data Analysis Program (80NSSC19K1215).</p> <p> </p> <p><strong>Contents:</strong></p> <p> </p> <ol> <li><em>MCS_CONVINST_INDFILE_SURVEY_DESC.pdf</em></li> </ol> <p>A copy of this description in PDF format.</p> <p> </p> <ol> <li><em>MCSconvinst_indivncfiles.tar.gz</em></li> </ol> <p>This compressed tar archive contains 63196 Network Common Data Format (netCDF) files (~ 20 GB uncompressed) named in the form:</p> <p> </p> <p>xxxxxx_convinst.nc, where xxxxxx is the re-centered orbit number of MRO defined by Heavens et al. (2018). The contents of this file type is:</p> <p> </p> <p>Variables:</p> <p> </p> <ol> <li>entrynum: Number to index retrievals in the file</li> <li>Pgrid: The pressure (Pa) level grid</li> <li>lapserateunstableprob_rets: The probability (%) of convective instability in an individual profile at a given pressure level</li> <li>altrets: The altitude grid (km) of each individual profile in relative to the Mars Orbiter Laser Altimeter (MOLA) areoid</li> <li>ampmrets: A flag to indicate whether MRO is in its ascending PM orbit (~ 15:00 LST at the Equator) or in its descending AM orbit (~ 3:00 at the Equator). Precise local time can be estimated by using the MRO-MCS dataset directly or using sclkrets.</li> <li>latrets: The latitude of the profile in degrees north.</li> <li>longrets: The longitude of the profile in degrees east</li> <li>loopflagrets: A flag to indicate the presence of nearby loops; flag = 1 indicates the presence of a nearby loop.</li> <li>lsrets: Areocentric longitude (degrees) of each individual profile</li> <li>myrets: Mars Year of each individual profile</li> <li>sclkrets: SCLK (seconds since 1 January 1980 00:00:00 UTC) for each individual profile</li> </ol> <p> </p> <p><strong>References</strong></p> <p> </p> <p>Heavens, N. (2022), Epitomic Data for a Multiannual Record of Convective Instability in Mars's Middle Atmosphere from the Mars Climate Sounder, Mendeley Data, V1, doi: 10.17632/fmgvbpwdk7.1</p> <p> </p> <p>Heavens, N.G., A. Kleinböhl, M.S. Chaffin, J.S. Halekas, D.M. Kass, P.O. Hayne, D.J. McCleese, S. Piqueux, J.H. Shirley, and J.T. Schofield, 2018, Hydrogen escape from Mars enhanced by deep convection in dust storms, <em>Nature Astron</em>., 2, 126–132, doi: 10.1038/s41550-017-0353-4.</p>
Dataset for "Suppressing transverse mode instability through multimode excitation in a fiber amplifier"
<p>Numerical and theoretical data associated with "Suppressing transverse mode instability through multimode excitation in a fiber amplifier" (doi.org/10.1073/pnas.2217735120). </p>
Data for: Wall fracturing versus mechanical instability as competing intrusion mechanisms of dikes: Insights from laboratory experiments
<p class="MsoNormal"><span>Igneous dike intrusion is a primary crust-forming process. Understanding its governing mechanism is very crucial for studies related to the lithosphere. We performed liquid injection experiments in the laboratory with two new crust analog model materials, i) ultrasound transmission gel (<em>USTG</em>) and gel wax. To conduct a properly scaled model experiment, we test their rheology using an <em>Anton Paar M302e</em> rheometer. The measured rheological data were presented in this present data repository. We identified three mechanisms from our laboratory studies: a) fracturing, b) interfacial instability, and c) hybrid, i.e., a combination of both. These three mechanisms give rise to distinct 3D geometries. To quantitatively analyze their geometric shapes, we performed fractal, aspect ratio, and skewness-kurtosis analysis. The procedure and the data collected during the analysis were also presented in the current data repository. </span></p>
model results from NHWAVE simulations of lobe-and-cleft instabilities at a river plume front
<p>The dataset contains the results from NHWAVE simulations of the lobe-and-cleft instabilities at a river plume front. The data format is .mat. The postprocessing scripts are included. </p>
Experimental and Simulation Data for "Hierarchical structure formation by crystal growth-front instabilities during ice templating" (2023) PNAS
<pre>Experimental and Simulation Data for: "Hierarchical structure formation by crystal growth-front instabilities during ice templating" by Kaiyang Yin, Kaihua Ji, Louise Strutzenberg Littles, Rohit Trivedi, Alain Karma, Ulrike G.K. Wegst (2023) PNAS, DOI: 10.1073/pnas.2210242120. </pre>
Datasets for "Relic gravitational waves from the chiral plasma instability in the standard cosmological model"
<pre>This directory contains an index.html file with links to the run directories and idl plotting routines with secondary data for the other figures for the paper "Relic Gravitational Waves from the Chiral Plasma Instability in the Standard Cosmological Model". If anything turns out to be incomplete, please email brandenb@nordita.org.</pre>
Suppression of Bend Instability in Microtubule-fd Virus Composite Active Nematics by External Magnetic Field
<p>The shear flow-aligned active nematic within a cuboidal channel is subjected to an external magnetic field (1.8T) in the aligned nematic direction. In the absence of the magnetic field, bend deformations proliferate, generating flows perpendicular to the initial alignment, as seen in the control case where no external field is applied (PIV vectors overlaid on the image for visual representation). Under the influence of the magnetic field, the bend instabilities are quelled, as there are no flows perpendicular to the applied field. Tracer beads are utilized for brightfield imaging in the magnetic field apparatus to distinguish between the conditions, while fluorescently labeled microtubules are observed in the control scenario.</p>
Data from: Suppression of Huntington’s disease somatic instability by transcriptional repression and direct CAG repeat binding
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Data for: Wall fracturing versus mechanical instability as competing intrusion mechanisms of dikes: Insights from laboratory experiments
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Data and Supplement from: Phylogenetic tree instability after taxon addition: Empirical frequency, predictability, and consequences for online inference
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Spatial coding dysfunction and network instability in the aging medial entorhinal cortex
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Data from: Seasonal brain regeneration and chromosome instability are linked to selection on DNA repair in Sorex araneus
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Group augmentation underlies the evolution of complex sociality in the face of environmental instability
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Data from: Measuring instability in chronic human intracortical neural recordings towards stable, long-term brain-computer interfaces
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ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.