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1,663 results for “shells”
Artifact 5 - Conch Shell - Sanford Museum
Source: Objaverse 1.0 / Sketchfab
Turtle Shell (VCU_3D_5874)
This turtle shell was recovered trom the Trigg sie (44MY3). It was 3-D scanned with a NextEngine Desktop 3D scanner on 8 February 2021. Repository number 443-21. This artifact is made freely downloadable by the Virginia Department of Historic Resources for non-commercial research, educational, and public outreach purposes. Source: Objaverse 1.0 / Sketchfab
Incised Plate With Shell Temper (2) 500-800 Yo
Source: Objaverse 1.0 / Sketchfab
Shell Pin (2158a23-2)
**Shell pin** Location: Peachtree site (31Ce1), Cherokee County, North Carolina. Period: Mississippian (AD 1400-1600). Material: marine shell. Dimensions: length, 59.6 mm; diameter, 19.7 mm. Notes: Catalog no. 2158a23 (specimen 2), North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Chris LaMack. Source: Objaverse 1.0 / Sketchfab
Columella Shell Beads (70a1194)
**Shell Beads (n=17)** Location: Town Creek site (31Mg2-3), Montgomery County, North Carolina. Period: Mississippian, Pee Dee phase (AD 1150-1350). Material: marine shell. Dimensions: length, 13.2 cm; width, 11.3 cm (background size). Notes: Catalog no. 70a1194 (n=17). North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Sebastian Farris. Source: Objaverse 1.0 / Sketchfab
Shell Beads (1040a1381)
** Shell Beads (n=82)** Location: Town Creek site (31Mg2-3), Montgomery County, North Carolina. Period: Mississippian, Pee Dee phase (AD 1150-1400). Material: marine shell. Dimensions: length, 19.6 cm; width, 16.8 cm (background size). Notes: Catalog no. 1040a1381 (n=82). North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Sebastian Farris. Source: Objaverse 1.0 / Sketchfab
Shell Gorget (1040a1359-2-1)
**Shell Gorget** Location: Town Creek site (31Mg2-3), Montgomery County, North Carolina. Period: Mississippian, Pee Dee phase (AD 1150-1400). Material: marine shell. Dimensions: length, 91.5 mm; width, 81.3 mm; thickness, 41.8 mm. Notes: Catalog no. 1040a1359-2 (specimen 1 of 2). North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Steve Davis. Source: Objaverse 1.0 / Sketchfab
Experimental studies on snaking in 3D-printed cylindrical shells under axial compression using photogrammetry
<p>The buckling instability of cylindrical shells under axial compression has been one of the most renowned problems in structural engineering for several decades. Many pioneering works in the 20<sup>th</sup> century have provided insights into understanding the shells' infamous imperfection sensitivity and led to reliability-based designs. However, a recent surge in numerical studies of the snaking phenomenon explores the development of a localised stable post-buckling mode in axially compressed cylindrical shells. Hitherto, none of the experimental studies report on the evolution of azimuthal snaking. In this work, experimental studies are carried out with the objective of revealing the snaking phenomenon. The axial compression experiments are performed on 3D-printed shells made of thermoplastic polyurethane (TPU). The work's novelty lies in the usage of TPU shells for slowing down the propagation of circumferential dimples and making it feasible to capture them using Photogrammetry. Despite the match between the experimental and numerical mode shapes, the experiments reveal multiple routes for the snaking sequence. Furthermore, mode transitions such as reduction in circumferential wave number and transformation of symmetric mode into an asymmetric one are observed. These experimental results provide insights into the localised phenomenon of snaking and validate numerical solutions.</p>
Supplementary material 1 from: Salvador RB, Breure ASH (2024) Pilsbrylia, a dextral-shelled door snail from South America (Gastropoda, Clausiliidae). Zoosystematics and Evolution 100(1): 9-14. https://doi.org/10.3897/zse.100.110105
Table listing all species used in the present analysis, including information on their locality of origin and GenBank accession numbers
Comparative Pore Structure and Dynamics for Bacterial Microcompartment Shell Protein Assemblies in Sheets or Shells
<blockquote> <p>Input structures for a manuscript, along with selected output data and structures. This directory structure contains a cut-down copy of the directories used to generate the simulation data and the analysis. In order to make this fit into the 50GB Zenodo limit, it was constructed with the following tar commands:<br><br>For <a href="../api/records/10800570/draft/files/bmc_shell_vs_sheet.tar.gz/content" target="_blank" rel="noopener noreferrer">bmc_shell_vs_sheet.tar.gz:</a><br><code>tar -zcvf bmc_shell_vs_sheet.tar.gz --exclude="*BAK" --exclude="*#" --exclude="*log" --exclude="*xsc" --exclude="*coor" --exclude="*vel" --exclude="*[0-9].out" --exclude="*old" --exclude="*dcd" --exclude="*tmp" --exclude="*ppm" --exclude="*png" --exclude="*pdf" --exclude="*catchy*" --exclude="*svg" --exclude="*restart*" --exclude="*history" --exclude="core.*" --exclude="FFTW_NAMD*" --exclude="*avi" --exclude="*mp4" --exclude="*pcad*" --exclude="*pcaa*" --exclude="*ammn*" --exclude="*amnp*" --exclude="*amsa*" --exclude="*dtnt*" --exclude="*mthl*" --exclude="*ntrt*" --exclude="*.inp" --exclude="*.sph" --exclude="structures" --exclude="test-sim" --exclude="test-sim-flatten-constantarea" --exclude="*.dx"</code><br><br>For <a href="../api/records/10800570/draft/files/bmcflattenmdff.tar.gz/content" target="_blank" rel="noopener noreferrer">bmcflattenmdff.tar.gz</a>:<br><code>tar --exclude="emdensitymap" --exclude="emstructures" --exclude="forSaad" --exclude="*dcd" --exclude="*ppm" --exclude="*mp4" --exclude="*png" --exclude="*old" --exclude="*BAK" --exclude="*txt" --exclude="animations" --exclude="apbs*" -zcvf bmcflattenmdff.tar.gz</code><br><br>The bmc_shell_vs_sheet has the folder test-sim-curved for shell simulation while test-sim-flatten-noconstantratio for sheet simulation.<br>Pore analysis for shell can be found in hole2 and for sheet in hole-flatten<br>Analysis has been done with various *py *sh and *tcl files<br>For visualizing trajectories in VMD "<strong>load*.tcl</strong>" scripts were used.<br><br>The bmcflattenmdff contains all the scripts needed for converting the shell topology to sheet.</p> </blockquote>
Optical constants, cross-sections, and supporting Python scripts for Fe L shell XAFS compounds in Corrales et al (2024), accepted to AAS Journals
<p>This Zenodo repository contains the data products and calculations of Corrales et al. (2024), https://arxiv.org/abs/2402.06726 (accepted to AAS Journals)</p> <p> </p> <p><strong>A WORD OF CAUTION</strong></p> <p>The cross-sections presented here have not been shifted in absolute energy scale. One of the key results from Corrales et al. (2024) is that the energy scale calibration for these compounds needs to be revisited. Please proceed with caution when using this information.</p> <p> </p> <h2>Optical Constants</h2> <p>kkcalc_products/ - This folder contains optical constants for the various compounds</p> <p>kkcalc_products/*_input.dat files contain the absorption as measured in Lee et al. (2009) https://ui.adsabs.harvard.edu/abs/2009ApJ...702..970L/abstract). These values are supplied as input to kkcalc (https://ui.adsabs.harvard.edu/abs/2014OExpr..2223628W/abstract, available at https://github.com/benajamin/kkcalc), along with the stoichiometric formula and material density for the compound of interest.</p> <p>kkcalc_products/*_refrac.dat files contain the kkcalc output, i.e., the real and imaginary parts of the complex index of refraction (m). The "Delta" column equals Re(1-m) and the "Beta" column equals Im(m).</p> <p> </p> <h2>Python Scripts</h2> <p>extinction_xsects.py - Calculates the extinction cross-section for an MRN distribution of dust</p> <p>These Python files from github.com/eblur/gastronomy are used by extinction_xsects.py in order to properly scale the mass column density to Fe abundance:</p> <ul> <li>abundances.py</li> <li>molecules.py</li> <li>minerals.py</li> </ul> <p> </p> <h2>Extinction Cross-sections</h2> <p>extinction_xsects/ - This folder contains the results of extinction_xsects.py</p> <p>extinction_xsects/*_FeL.pdf - A plot of the high resolution Fe L shell features</p> <p>extinction_xsects/*_broad.pdf - A plot of the broad band (0.3 - 10 keV), lower resolution cross-sections with 50 eV spacing. These cross-sections include extrapolations for the K and L shell features for other elements in the compounds based on Henke tables (see Watts et al. 2014)</p> <p>extinction_xsects/*_final.pdf - A plot of the consolidated (low resolution broad band and high resolution Fe L shell) extinction cross-sections</p> <p>extinction_xsects/*_xsect.fits - The final cross-section information for each compound, stored as fits file table. The table columns are energy, absorption optical depth, scattering optical depth, and extinction optical depth. All optical depths are scaled to have a total dust mass column of 1e-4 g cm^-2.</p>
Supporting for "Bivalve Resilience to Ocean Acidification: Active H+ Efflux as a Mechanism for Shell Growth Maintenance"
<p><span>Summary: </span></p> <p><span>This dataset encompasses a comprehensive collection of responses from the Manila clam <em>Ruditapes philippinarum</em> to ocean acidification. Key metrics included in this dataset are oxygen consumption rate, Ammonia-N excretion rate, intracellular pH, H⁺ flux, expression and activity of acid-base regulatory genes, and individual growth measurements.</span></p> <p><span> </span><span>The data was systematically compiled from both field mesocosm and laboratory experiments aimed at elucidating the physiological responses and underlying mechanisms by which bivalves adapt to the stressors associated with ocean acidification.</span></p> <p><span> </span><span>Data generation occurred primarily between 2020 and 2023. This dataset serves as a valuable resource for enhancing our mechanistic understanding of the responses and adaptive potential of marine bivalves in the context of escalating ocean acidification.</span></p>
Snap and Jump: How Elastic Shells Pop Out
<p>Experimental and simulation data for the paper (<a href="https://doi.org/10.48550/arXiv.2410.08525" target="_blank" rel="noopener">preprint version</a>). This Excel file comprises 11 sheets, each corresponding to the data in Figures 2(a), 2(b)-(e), 3(a-c), 4, and S2(a,b).</p>
Figure 4. Shell and opercular valves. A in Molecular analysis reveals a cryptic species of Chthamalus (Crustacea: Cirripedia) in the Cape Verde Islands
Figure 4. Shell and opercular valves. A, Chthamalus sp. from Praia, Cape Verde, top view. B–D, scutum and tergum inner view: B, Chthamalus sp. from Praia, Cape Verde; C, Chthamalus stellatus from Las Palmas, Gran Canaria, Canary Islands; D, C. stellatus from Biarritz, France. E, scutum and tergum outer view, Chthamalus sp. from Praia, Cape Verde.
Data, Codes for 'Electronic Structure and Epitaxy of CdTe Shells on InSb Nanowires'
<p>Measurement_Raw_data.zip:</p> <p> Full Original Raw Data for all devices.</p> <p>Measurement summary.zip:<br> Measurement and fit method summary (in PPT).</p> <p>Simulation and Fit.zip:<br> Code for capacitance simulation and data fitting.</p> <p>Measurement Log.zip:</p> <p> Word file contain all commends used in measurement and correspond results.<br> </p> <p>Data formats:<br> MTX:<br> A simple 2D/3D matrix format developed for Spyview (https://nsweb.tn.tudelft.nl/~gsteele/spyview/).</p> <p> DAT:<br> Original plain-text tabular data.</p> <p> SET:<br> Instrument settings.</p> <p> PY:<br> Measurement scripts.</p>
Figure 1 in The balanced life: evolution of ventral shell weighting in gastropods
Figure 1. Examples of Recent gastropods with a ventral callus. All specimens are in the Vermeij collection. A, Monetarla caputserpentis Linnaeus, 1758 (Cypraeidae), reef off Nchesar, Babeldaob, Palau, collected 5 September 1975; cypraeiform callus. B, Cypraecassis testiculus Linnaeus, 1758 (Cassidae), grassbeds, Isla Galeta, Atlantic Panama, collected 12 April 1975; cassiform callus. C, Vasum rhinoceros Gmelin, 1791 (Vasidae), in grassbeds, Klkambala, Kenya, collected June 1972; modified cassiform callus. D, Gutturnium muriclnum Roding, 1798 (Cymatlidae), at depth of 4 m lying on its dorsal side, northeast coast of Urukthape1, Palau, collected 19 June 1984 by Roy K. Kropp; modified cassiform callus. E, Polinices mammilla Linnaeus, 1758 (Naticidae), Cocotiers beach, Nosy-Be, Madagascar, collected 29 June 1972; pseudoliviform callus. F, Phrontis luteostoma Broderip & Sowerby, 1829 (Nassariidae), Playa Venado, Pacific Panama, collected 28 August 1969; cassiform callus. G, Ministrombus variabilis Swainson, 1820 (Strombldae), depth of 12 m, Malakal, Palau, collected 9 July 1984 by Roy K. Kropp; modified cassiform callus. H, Nassarius pullus Linnaeus, 1758 (Nassariidae), grassbed, Taneti Island, Maluku, Indonesia, collected 12 July 1979; cassiform callus. I, Linnerita polita Linnaeus, 1758 (Neritidae), Tagachan Point, Guam, collected 26 May 1981; modified cassiform callus. Scale bar: 1 cm.
Data of "Electronic Structure and Epitaxy of CdTe shells on InSb Nanowires"
<p>This folder contains the figure data of "Data of "Electronic Structure and Epitaxy of CdTe shells on InSb Nanowires""</p>
Resveratrol loaded chitosan-pectin core-shell nanoparticles as novel drug delivery vehicle for sustained release and improved antioxidant activities
<p><span>Resveratrol, chemically known as 3, 5, 4'-trihydroxy-trans-stilbene, is a natural polyphenol with promising multi-targeted health benefits. The optimal therapeutic uses of resveratrol are limited due to its poor solubility, rapid metabolism and low bioavailability. To address the issues, we have encapsulated resveratrol inside the nanosized core made of chitosan and coated this core with pectin - shell in order to fabricate a drug delivery vehicle which can entrap resveratrol for a longer period of time. The core - shell nanoparticles fabricated in this way were characterized with the help of Fourier Transform Infrared Spectrometer (FTIR), Field Emission Scanning Electron Microscope (FESEM), Field Emission Transmission electron microscopy/Selected Area Electron Diffraction (FETEM/SAED), High-Resolution Transmission Electron Microscope (HRTEM)), Dynamic Light Scattering (DLS) and Zeta Potential measurements. In vitro drug release study showed the ability of the core-shell nanoparticles to provide sustained release of resveratrol for almost 30 hours. The release efficiency of the drug was found to be pH dependent and a sequential control over drug release can be obtained varying the shell thickness. The resveratrol encapsulated in a nanocarrier was found to have a better in vitro antioxidant activity than free resveratrol as determined by DPPH radical scavenging method. This work finally offers a novel nano-based drug delivery system.</span></p>
Figure 1 in A theoretical composite model for population sex-specific shell size dynamics in Strombidae (Gastropoda, Neostromboidae)
Figure 1. Modelling male and females population distribution curves showing the mean size (μ) of each sex and the (1) Sex dependant factors: a) time to maturity; b) intra-male competition; c) femalespecific sexual selection; d) fecundity; (2) Inter-sex dependant factors: e) time to maturity; f) sex bias towards larger numbers of females; and (3) Population factors: g) environmental conditions; and h) universal size regulators that affect the size ratio between females and males.
Data from: Thicker shells reduce copepod grazing on diatoms
<p>The diatom frustule provides partial protection against copepods, yet we do not know the mechanism behind the reduced grazing. We used direct observations of copepod-diatom interactions to compare rejection frequency and prey-handling times of diatoms with different degrees of silica content in three differently sized species. </p> <p>We compared rejection frequency and prey-handling times of thick- and thin-shelled cells of the diatoms <em>Cyclotella cryptica</em>, <em>Thalassiosira weissflogii</em>, and <em>Ditylum brightwellii.</em> We found that for all three species, that thick-shelled cells were more frequently rejected by the copepods subsequent to being captured. </p> <p>The copepod prey-handling times, i.e., the time from the copepod reacted to the prey until it had been ingested or rejected, generally increased with prey size. We further found that thicker-shelled cells in the two larger species, <em>T. weissflogii </em>and <em>D. brightwellii</em>, were handled for so long that the copepods lose time for foraging. Both of these mechanisms have implications for carbon sequestration and for securing a large seed population at depth, and may be why many diatoms are able to form blooms even in the presence of dense grazer populations. </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.