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1,663 results for “shells”
Incorporation of trace metals into land snail shells on the Chinese Loess Plateau as proxies for paleo-precipitation
<p><span>This dataset provides the results of trace metal compositions of modern snail shells (<em>Cathaica sp.</em>) collected from </span><span>sixteen sites </span><span>on the Chinese Loess Plateau.</span></p>
i2200_snail shell
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"Fruity" Dye-based Fluorescent Nanoparticles (dFONs): A Fully Organic Counterpart of Alloy and Core-Shell Metallic Nanoparticles. Tuning Topology to Maximize Nano-interfacial Promoted Fluorescence Enhancement
<p>Data set related to the production of the figures in the article "“Fruity” Dye-based Fluorescent Nanoparticles (dFONs): A Fully Organic Counterpart of Alloy and Core-Shell Metallic Nanoparticles. Tuning Topology to Maximize Nano-interfacial Promoted Fluorescence Enhancement" by Kurek et al.</p> <p> </p> <p>The data are in txt, lif and opju format, organised by figure and sub-figures and compressed. </p>
Ancillary files for "Graded transcendental functions: an application to four-point amplitudes with one off-shell leg"
<p>We provide ancillary files to "Graded transcendental functions: an application to four-point amplitudes with one off-shell leg".</p> <p>All attached files are in Mathematica format. See also appendix C of the manuscript for details on the ancillary files. </p> <ul> <li><strong>Families.zip: </strong><br>For each integral family, we provide in a single file <em>familyname.m</em> the list of propagators, a canonical basis and the corresponding differential equations, and a regularised boundary vector at the point (x, y) = (0, 0). <br>Files contain a list of Mathematica replacement rules in the format {prop["familyname"]-> {...}, basis["familyname"]-> {...}, boundaries["familyname"]-> {....}, DE["familyname"]-> {...}}. </li> <li><strong>BoundariesDemo.zip</strong>: An executable notebook implementing the fixing of boundary constants using the method for a two-loop example.</li> <li><strong>TridentFunctions.zip</strong>: For each relevant canonical integral and kinematic crossing listed in <em>basis_labels.m</em>, we provide a map to the trident functions in the form of a sparse rational array of size 13812 × 1282 in <em>mapping_positions.m</em> and <em>mapping_values.m</em>. We also provide the UT Laurent expansions of the trident functions in terms of 42258 iterated integrals and transcendental constants in <em>sb_labels.m</em>, again as a sparse array in <em>expansion_positions.m</em> and <em>expansion_values.m</em>.</li> <li><strong>FormFactor.zip</strong>: We provide the three-loop finite remainders R(3) and E(3) of the N = 4 sYM form factor in terms of Chen iterated integrals and MPLs.</li> <li><strong>Hjet.zip</strong>: The three independent helicity coefficients for the decay of a H boson to three partons at three loops are given in terms of iterated integrals and in a manifestly real MPL representation. In particular, we provide the part of the finite remainders containing new letters, with rational coefficients evaluated at x = 3/13, y = 11/17. </li> </ul>
Space between the double shell dome of Haroon Vela Tomb- Isfahan-Iran
<p>These photos demonstrate the construction details of the space between the double shell dome of Haroon Vela Tomb including domes, Khashkhashi (Stiffeners), and structural timber elements. </p>
Data from: Degradation of internal organic matter is the main control on pteropod shell dissolution after death
The potential for preservation of thecosome pteropods is thought to be largely governed by the chemical stability of their delicate aragonitic shells in seawater. However, sediment trap studies have found that significant carbonate dissolution can occur above the carbonate saturation horizon. Here we present the results from experiments conducted on two cruises to the Scotia Sea to directly test whether the breakdown of the organic pteropod body influences shell dissolution. We find that, on the timescales of three to thirteen days, the oxidation of organic matter within the shells of dead pteropods is a stronger driver of shell dissolution than the saturation state of seawater. Three to four days after death, shells became milky white and nano‐SEM images reveal smoothing of internal surface features and increased shell porosity, both indicative of aragonite dissolution. These findings have implications for the interpretation of the condition of pteropod shells from sediment traps and the fossil record, as well as for understanding the processes controlling particulate carbonate export from the surface ocean.
Supplementary material 2 from: Hayashi M, Sugiura S (2021) Shell-breaking predation on gastropods by Badister pictus (Coleoptera, Carabidae) with strikingly asymmetric mandibles. In: Spence J, Casale A, Assmann T, Liebherr JК, Penev L (Eds) Systematic Zoology and Biodiversity Science: A tribute to Terry Erwin (1940-2020). ZooKeys 1044: 815-830. https://doi.org/10.3897/zookeys.1044.62293
Table S1. Results of a generalized linear mixed model for effects of shell size, operculum presence, and the interaction on predation by Badister pictus.
FIGURE 5 in Shell morphometrics of three species of gadilid Scaphopoda (Mollusca) from the Southwestern Atlantic Ocean: comparing the discriminating power of primary and secondary descriptors
FIGURE 5. Bidimensional scatterplot defined by Discriminant Functions (DF) 1 and 2 based on Shimeck´s morphometric indices, plus Steiner & Linse's direct shell measurements, plus additional morphometric ratios. Gray circles = Cadulus braziliensis, Black squares = Gadila acus, and Open diamonds = Polyschides tetraschistus.
FIGURE 4 in Shell morphometrics of three species of gadilid Scaphopoda (Mollusca) from the Southwestern Atlantic Ocean: comparing the discriminating power of primary and secondary descriptors
FIGURE 4. Bidimensional scatterplot defined by Discriminant Functions (DF) 1 and 2 based on the direct shell measurements of Steiner & Linse. Gray circles = Cadulus braziliensis, Black squares = Gadila acus, and Open diamonds = Polyschides tetraschistus.
FIGURE 3 in Shell morphometrics of three species of gadilid Scaphopoda (Mollusca) from the Southwestern Atlantic Ocean: comparing the discriminating power of primary and secondary descriptors
FIGURE 3. Bidimensional scatterplot defined by Discriminant Functions (DF) 1 and 2 based on Shimek´s morphometric indices. Gray circles = Cadulus braziliensis, Black squares = Gadila acus, and Open diamonds = Polyschides tetraschistus.
FIGURE 1 in Shell morphometrics of three species of gadilid Scaphopoda (Mollusca) from the Southwestern Atlantic Ocean: comparing the discriminating power of primary and secondary descriptors
FIGURE 1. Scaphopoda used in the analysis: A = Gadila acus, length 9.0 mm, IBUFRJ 12854; B = Cadulus braziliensis, length 7.5 mm, IBUFRJ 6477; C = Polyschides tetraschistus, length 5.6 mm, IBUFRJ 7066.
FIGURE 2 in Shell morphometrics of three species of gadilid Scaphopoda (Mollusca) from the Southwestern Atlantic Ocean: comparing the discriminating power of primary and secondary descriptors
FIGURE 2. Schematic gadilid scaphopod with morphometric measurements taken. Ltot (total length), Wm (the maximum width), LWm (length from the anteriormost position of the ventral aperture of the shell to the widest portion of the shell), Arc (the maximum arc), Larc (length from the ventral aperture to the point of maximum arc), Haa (height of anterior aperture), Waa (width of anterior aperture), Hpa (height of posterior aperture), and Wpa (width of posterior aperture).
FIGURES 16–25, Shells. Figs.16–18 in Morphological and phylogenetic study of the Western Atlantic Crepidula plana complex (Caenogastropoda, Calyptraeidae), with description of three new species from Brazil
FIGURES 16–25, Shells. Figs.16–18: Crepidula protea, MZSP 30780, dorsal, ventral and right views. Figs. 19–21: C. glauca, MZSP 30810, left, dorsal and ventral views. Fig. 22–25: C. carioca. Figs. 22–23: Holotype, ventral and dorsal views. Figs. 24–25, paratype 1, MNRJ 7464, dorsal and ventral views. Scale bars = 2 mm.
FIGURES 1–15, Shells. Figs.1–2 in Morphological and phylogenetic study of the Western Atlantic Crepidula plana complex (Caenogastropoda, Calyptraeidae), with description of three new species from Brazil
FIGURES 1–15, Shells. Figs.1–2: Crepidula plana, dorsal and ventral views, MZSP 36327. Fig.3:4: C. atrasolea, dorsal and ventral views, MZSP 36328. Figs.5–6: C. depressa, dorsal and ventral views, MZSP 36326. Figs.7–9: C. pyguaia, dorsal, ventral views and detail of the protoconch, MZSP 35831 (Holotype). Figs.10–12: C. margarita, MZSP 36329, dorsal, central and right views. Fig.13–15: C. intratesta, MZSP 30791 (Holotype), left, dorsal and ventral views. Scale bars = 2 mm.
FIGURES 37–48. Shells. Figs. 37–40 in Revision of genera Gaza and Callogaza (Vetigastropoda, Trochidae), with description of a new Brazilian species
FIGURES 37–48. Shells. Figs. 37–40: Gaza rathbuni Holotype USNM 97054. Figs. 37–39: Shell in apertural, apical and umbilical views. Fig. 40: Detail of umbilical area; Diameter: 38 mm. Figs. 41–44: Callogaza watsoni Holotype MCZ 7544, a specimen with peristome not formed. Figs. 41–43: Shell in apertural, apical and umbilical views. Fig. 44: Detail of umbilical area; Diameter = 11 mm. Figs. 45–48: C. sericata MZSP 48530 from Aliguay, Philippines. Figs. 45–47: Shell in apertural, apical and umbilical views. Fig. 48: Detail of umbilical area. Diameter = 15 mm.
The shellome of the crocus clam Tridacna crocea emphasizes essential components of mollusc shell biomineralization
<p class="FirstParagraph">Molluscan shells are among the most fascinating research objects because of their diverse morphologies and textures. The formation of these delicate biomineralized structures is a matrix-mediated process. A question that arises is what are the essential components required to build these exoskeletons. In order to understand the molecular mechanisms of molluscan shell formation, it is crucial to identify organic macromolecules in different shells from diverse taxa. In the case of bivalves, however, taxon sampling in previous shell proteomics studies are biased and focus exclusively on representatives of the class Pteriomorphia such as pearl oysters, edible oysters and mussels. In this study, we have characterized the shell organic matrix from the crocus clam, <i>Tridacna crocea</i>, (Heterodonta) using various biochemical techniques, including SDS-PAGE, FT-IR, monosaccharide analysis, and enzyme-linked lectin assay (ELLA). Furthermore, we have identified a number of shell matrix proteins (SMPs) using a comprehensive proteomics approach combined to RNA-seq. The biochemical studies confirmed the presence of proteins, polysaccharides, and sulphates in the <i>T. crocea</i> shell organic matrix. Proteomics analysis revealed that the majority of the <i>T. crocea</i> SMPs are novel and dissimilar to known SMPs identified from the other bivalve species. Meanwhile, the SMP repertoire of the crocus clam also includes proteins with conserved functional domains such as chitin-binding domain, VWA domain, and protease inhibitor domain. We also identified BMSP (Blue Mussel Shell Protein, originally reported from <i>Mytilus</i>), which is widely distributed among molluscan shell matrix proteins. <i>Tridacna</i> SMPs also include low-complexity regions or LCRs that are absent in the other molluscan genomes, indicating that these genes may have evolved in specific lineage. These results highlight the diversity of the organic molecules - in particular proteins - that are essential for molluscan shell formation.</p>
FIGURE 2. Shell dimensions. H in Contribution to the taxonomy and distribution of Aciculidae (Mollusca: Gastropoda: Caenogastropoda) in Albania and the surroundings
FIGURE 2. Shell dimensions. H: shell height; W: shell width; H a: aperture height; W a: aperture width; H: body whorl height; b W : body whorl width; R*: 10 rib spaces, i.e. distance between a rib and the subsequent 10th rib in the mid-line of the body
Figure 5 in What is the matter with Corbicula fluminea (Mollusca: Bivalvia: Cyrenidiae)? Occurrence of unusual shell erosion in Northern Italy
Figure 5. Regression analysis of shell thickness (ShT) vs shell dry weight (ShDW) of the Gaviola and Castellana specimens. (a) Gaviola all specimens; (b) Gaviola small specimens; (c) Gaviola large specimens; (d) Castellana all specimens; (e) Castellana small specimens; (f) Castellana large specimens.
Figure 3 in What is the matter with Corbicula fluminea (Mollusca: Bivalvia: Cyrenidiae)? Occurrence of unusual shell erosion in Northern Italy
Figure 3. Mean (± standard deviation) (a) length (mm); (b) thickness (mm); and (c) shell dry weight (g).
Figure 2 in What is the matter with Corbicula fluminea (Mollusca: Bivalvia: Cyrenidiae)? Occurrence of unusual shell erosion in Northern Italy
Figure 2. The two semi-natural streams of the lower River Ticino catchment in south-west Lombardy (Northern Italy).
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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)
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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.