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1,663 results for “shells”
Figure 15 in Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae)
Figure 15. Genitalia of Pravonitor annulus, QM MO15645, Yam Island. a) Reproductive system. b) penis interior. c) Spermatophore. Scale bars: 1 mm.
Data for "Aqueous Gastropod Shells as Groundwater Radiocarbon Proxies"
<p>This document contains the data generated and used in the manuscript titled “EVALUATION OF AQUEOUS GASTROPOD SHELLS AS GROUNDWATER RADIOCARBON PROXIES ACROSS SPECIES AND SITES” with the DOI:10.1017/RDC.2022.103</p>
FIGURE 1. Pagurus hazenorum n in New hermit crab species (Anomura, Paguroidea) from the upper Miocene St Marys Formation of Maryland (USA), preserved in their host shells
FIGURE 1. Pagurus hazenorum n. sp., holotype, CMM-I-4785, from the upper Miocene St. Marys Formation in the cliff south of Little Cove Point, Calvert County, Maryland, USA, preserved in its host shell, and in dorsal (A), ventral (B), and dorsoventral (C) aspects.
FIGURE 2. Paguristes timoni n in New hermit crab species (Anomura, Paguroidea) from the upper Miocene St Marys Formation of Maryland (USA), preserved in their host shells
FIGURE 2. Paguristes timoni n. sp., holotype, CMM-I-4600, from the upper Miocene St. Marys Formation in the cliff south of Little Cove Point, Calvert County (Maryland), in its host shell, and in ventral (A) and dorsal (B) aspects.
Data from: Can fractal dimensions objectivize gastropod shell morphometrics? A case study from Lake Lugu (SW China)
<p>Morphometrics are fundamental for statistical analyses of fossils, particularly because soft parts or DNA are rarely preserved and thus hard parts such as shells are commonly the only source of information. Geometric morphometrics i.e. landmark analysis has been successfully established but exhibits a couple of shortcomings. On the one hand landmarking is rather subjective and on the other hand the application at the level of micro-sculpture is difficult.</p> <p>With the aid of high-resolution 3D scanning technology and analyses of fractal dimensions, we test whether shortcomings of linear and geometric morphometrics can be overcome. As a model group, we selected a clade of modern viviparid gastropods from Lake Lugu, the shells of which show a high degree of sculptural variation. Linear and landmark analyses were applied to the same shells, in order to root the fractal dimensions. The genetic diversity of the gastropod clade was basically assessed.</p> <p>The genetic results suggest that the gastropod clade represents a single species. The results of all morphometric methods applied are in line with the genetic results, which is that no clustering of morpho-types occurs. Apart from this overall agreement, landmark and fractal dimension analyses do not correspond with each other but represent data sets with different information. Generally, the fractal dimension values quantify the roughness of the shell surface, the resolution of the 3D-scans determining the level. In our approach, we captured the micro-sculpture but not the first-order sculptural elements, which explains that fractal dimension and landmark data are not in phase.</p> <p>We can show that analyzing fractal dimensions of gastropod shells opens a window to more detailed information that can be considered in evolutionary and ecological contexts. We propose that using 3D-scans with a low resolution may successfully substitute landmark analyses because it overcomes the subjective landmarking. Analyses of 3D-scans with higher resolution than used in this study will provide surface roughness information at the mineralogical level. We suggest that fractal dimension analyses of a combination of differently resolved 3D-models will significantly improve the quality of shell morphometrics.</p>
Data for "Turbulent drag at the ice-ocean interface of Europa in simulations of rotating convection: Implications for nonsynchronous rotation of the ice shell"
<p>Data files and python Jupyter notebook to reproduce Figures 2 - 6 from the manuscript "Turbulent drag at the ice-ocean interface of Europa in simulations of rotating convection: Implications for nonsynchronous rotation of the ice shell".</p> <p>Contents:</p> <p>Package</p> <p>--EuropaOceanTorque.ipynb - Jupyter Notebook to load and analyse data. Reproduces figures 1-2 from the manuscript.<br> --cs510 - Grid info files<br> --mitgcm_vis - plotting and interpolation functions<br> --Results - directory for all data files<br> --Setup<br> ----runx - input files for running MITgcm<br> ----code - mods for compiling the MITgcm</p>
FIGURE 2. Chaperia atypica n in Epibiotic association of encrusting cheilostome bryozoans on shells of an invasive mussel from rocky shores of South Africa, with the description of a new aviculiferous species of Chaperia
FIGURE 2. Chaperia atypica n. sp. A–C. SAMC-A094525. A. General view of the colony. B. Group of zooids, showing pore-chamber windows and spines. C. Close-up of the orifice. D. Paratype, SAMC-A094513. Group of zooids with arrows indicating twinned and single interzooidal avicularia. E, F. Holotype, SAMC-A094514. E. Group of ovicelled zooids with arrows indicating vestigial ooecia. F. Close-up of the vestigial ooecia with an arrow indicating the ooecial pore. Scale bars: A = 1 mm; B = 0.4 mm; C = 0.1 mm; D, E = 0.4 mm; F = 0.2 mm.
FIGURE 1 in Epibiotic association of encrusting cheilostome bryozoans on shells of an invasive mussel from rocky shores of South Africa, with the description of a new aviculiferous species of Chaperia
FIGURE 1. Map showing the location of 15 intertidal rocky-shore sites along the south–southeast coast of South Africa where epibiotic bryozoans were sampled on live shells of the mussel Mytilus galloprovincialis.
FIGURE 3. A–C. Celleporella hyalina SAMC-A094510. A in Epibiotic association of encrusting cheilostome bryozoans on shells of an invasive mussel from rocky shores of South Africa, with the description of a new aviculiferous species of Chaperia
FIGURE 3. A–C. Celleporella hyalina SAMC-A094510. A. General view of the colony. B. Single ovicelled zooid. C. Group of ovicelled zooids and a male dwarf zooid. D–F. Hippomonavella sp. SAMC-A094529. D. Group of zooids. E. Group of zooids, some with developing ovicells. F. Close-up of the orifice, showing condyles and suboral avicularium. Scale bars: A = 1 mm; B, C = 0.2 mm; D = 1 mm; E = 0.4 mm; F = 0.1 mm.
Stable isotope record of the Tridacna shell from the southern South China Sea
<p>Carbon and oxygen stable isotope record of the Tridacna shell from the southern South China Sea between 1989 and 2013.</p>
Figure 8. Velutinidae shells. A in Neither slugs nor snails: a molecular reappraisal of the gastropod family Velutinidae
Figure 8. Velutinidae shells. A, Djiboutia sp. (L26), MNHN-IM-2019-7668. B, Coriocella sp. (L27), MNHN-IM-2013-84230. C, Lamellaria latens complex (L41), MNHN-IM-2019-14179. D, Marsenia perspicua complex (L55), MNHN-IM-2019-14574. Scale bars: A, C, D, 1 mm; B, 5 mm. For the sequenced specimens, the corresponding species code (see Fig. 3) is reported in parentheses.
Figure 6. Velutinidae shells. A in Neither slugs nor snails: a molecular reappraisal of the gastropod family Velutinidae
Figure 6. Velutinidae shells. A, Marseniopsis conica, BAS 03-764. B, Hainotis sharonae, LACM 1059, holotype (after Willet, 1939: fig. 1 and 1a). C, Marsenina rhombica, BAU 4229. D, Limneria prolongata, BAU 4228. Scale bars: A, 1 mm; C, D, 5 mm; B, shell maximum diameter = 5.5 mm, shell height 7.4 mm.
Figure 7. Velutinidae shells. A in Neither slugs nor snails: a molecular reappraisal of the gastropod family Velutinidae
Figure 7. Velutinidae shells. A, Calyptoconcha pellucida, BAU 3758. B, Variolipallium cerebroides, NIWA 74086.A. C, Pacifica lentiginosa sp. nov., MNHN-IM-2009-16140, holotype. D, Pacifica sp. (L16), MNHN-IM-2013-58543. Scale bars: A, B, 5 mm; C, D, 1 mm. For the sequenced specimens, the corresponding species code (see Fig. 3) is reported in parentheses.
Data for the publication by Mouchi et al "A step towards measuring connectivity in the deep-sea: elemental fingerprints of mollusk larval shells discriminate hydrothermal vent sites"
<p>This is the elemental data collected by fsLA-ICP-MS-MS on 600 individual larval shells of the hydrothermal-vent limpet Shinkailepas tollmanni from 14 sites in the Southwest Pacific Ocean.</p> <p>The first column indicates the sample ID corresponding to onship sample during the scientific cruise CHUBACARC (Hourdez & Jollivet, 2019).</p> <p>The second column indicates the S. tollmanni sample ID from the publication of Mouchi et al.</p> <p>Columns 3 to 15 correspond to elemental abundances measured.</p> <p>Column 16 to 18 correspond to the region, area and hydrothermal sites, respectively, for each larval shell.</p> <p> </p> <p>Hourdez, S., Jollivet, D., 2019. CHUBACARC cruise, <em>L’Atalante R/V</em>. doi: 10.17600/18001111.</p>
Dataset of "Parameter regimes of hemispherical dynamo waves in a spherical shell from 3D MHD simulations" submitting to JGR: Planets
<p>Simulation data using Magic code. In the "general properties" part, basic properties (e.g., Pm, Rm, Rol, wave frequency, regime types....) are compressed into 3 python numpy .npz files, according to different Ekman number. For the regime types, we use 0 for failed dynamos, 1 for dipoles, 2 for global waves, 3 for hemispherical waves and 4 for multipolar solutions. In the "cases" part, we include raw output from Magic code for certain cases shown in the article.</p>
Randomly stacked open cylindrical shells as functional mechanical energy absorber
<p>Experimental and simulation data for the paper entitled <em>Randomly stacked open cylindrical shells as functional mechanical energy absorber. </em></p> <p>Download and unzip the AllFigureData.zip. </p> <p>Contact</p> <p>Experiments: sano@mech.keio.ac.jp</p> <p>Simulations: florence.bertails@inria.fr</p>
Experimental evidence associates burrowing behavior of Castalia ambigua (Bivalvia: Hyriidae) with shell shape and density
<p>Information on freshwater mussel behavior in the sediment is scarce worldwide, especially in the Amazon. Laboratory experiments were used to measure the responses of the single mussel species <em>Castalia ambigua</em> in relation to combinations of two co-occurring different morphotypes (<em>Morphotype I</em> with an elongated shell and <em>Morphotype II </em>with a rounded shell), and three different densities (4, 8 and 16 mussels). Horizontal movements (cm) were calculated by summing changes in the position of each specimen and the shell exposure at the sediment-water interface was obtained by measuring (mm) the exposed part of the shell. <em>Castalia ambigua</em> presented different patterns of shell exposure and horizontal movements linked with shell shape and density. <em>Castalia ambigua Morphotype I</em> remained less exposed with 4 mussels. In contrast, this morphotype was more exposed and tended to aggregate in treatments with 8 and 16 mussels, similar to observations of <em>Morphotype II</em> at all densities. <em>Morphotype II</em> is mainly found in low hydrodynamic energy habitats, suggesting that patches with high densities may stabilize the substrate around the shells of <em>Morphotype I</em>, which is associated with high hydrodynamic energy habitats. We suggest that these patterns may be associated with intrinsic factors of the species, such as reproduction, sexual dimorphism and feeding. Moreover, additional studies using other mussel species belonging to the families Hyriidae and Mycetopodidae are important, since the behavior of these mussels in the sediment may provide useful information on their functional roles in river ecosystems.</p>
Direct strain correlations at the single-atom level in three-dimensional core-shell interface structures
<p>The data and source codes for the paper [H.J., D.H.W., T.L., Y.K., C.J., J.L., H.B., A. J. P., W.T., C.O., P.E., Y.-L.L., S.R., S.W.H., and Y.Y., "Direct strain correlations at the single-atom level in three-dimensional core-shell interface structures", <em>Nat. Commun.</em> <strong>13</strong>, 5957 (2022)] are posted below.</p> <p> </p> <p>Nanomaterials with core-shell architectures are prominent examples of strain-engineered materials. The lattice mismatch between the core and shell materials can cause strong interface strain, which affects the surface structures. Therefore, surface functional properties such as catalytic activities can be designed by fine-tuning the misfit strain at the interface. To precisely control the core-shell effect, it is essential to understand how the surface and interface strains are related at the atomic scale. Here, we elucidate the surface-interface strain relations by determining the full 3D atomic structure of Pd@Pt core-shell nanoparticles at the single-atom level via atomic electron tomography. Full 3D displacement fields and strain profiles of core-shell nanoparticles were obtained, which revealed a direct correlation between the surface and interface strain. The strain distributions show a strong shape-dependent anisotropy, whose nature was further corroborated by molecular statics simulations. From the observed surface strains, the surface oxygen reduction reaction activities were predicted. These findings give a deep understanding of structure-property relationships in strain-engineerable core-shell systems, which can lead to direct control over the resulting catalytic properties.<br> <br> </p> <p>1. Raw experimental tilt series images for Particle 1 and Particle 2 (Raw tilt series images.zip).</p> <p>2. Denoised and aligned tilt series images for Particle 1 and Particle 2 (Finalized tilt series images.zip).</p> <p>3. Finalized tilt angles for Particle 1 and Particle 2 (Finalized tilt angles.zip).</p> <p>4. 3D tomographic reconstruction for Particle 1 and Particle 2 (Final reconstruction.zip).</p> <p>5. Final atomic structure for Particle 1 and Particle 2 (Final atomic structure.zip).</p> <p>6. Indices of surface Pd atoms for Particle 1 and Particle 2 (Indices of surface Pd.zip).</p> <p>7. Source codes for the assignment of atomic coordinates, displacement/strain calculation and ORR activity calculation (Code_PdPt.zip).</p> <p> </p> <p>If you use any of the above data or source codes in your publications and/or presentations, our paper should be properly cited: H.J., D.H.W., T.L., Y.K., C.J., J.L., H.B., A. J. P., W.T., C.O., P.E., Y.-L.L., S.R., S.W.H., and Y.Y., "Direct strain correlations at the single-atom level in three-dimensional core-shell interface structures", <em>Nat. Commun.</em> <strong>13</strong>, 5957, (2022).<br> <br> If you have any questions regarding the above data or source codes, please contact Yongsoo Yang, Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea. Email: <a href="mailto:yongsoo.yang@kaist.ac.kr">yongsoo.yang@kaist.ac.kr</a></p>
Elevation data for On the More Complex Wavelength Dependency of Airy Isostasy in Icy Shells of Ocean Worlds
<p>Elevations for surface and root topographies of simulated displacements. </p>
FIGURE 4. Eocyzicus saharicus. A, head. B, shell pattern. C–D, telson. E, left clasper. F in Mapping the Geographic Distribution of Large Branchiopods in Algeria and a checklist update
FIGURE 4. Eocyzicus saharicus. A, head. B, shell pattern. C–D, telson. E, left clasper. F, dorsal portion of the abdomen.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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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.
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