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1,663 results for “shells”
The in situ Mg/Ca ratios of planktonic foraminifera shells in the northeastern South China Sea: an attempt to get efficient and reliable proxies
<p>Planktonic foraminifera are one of the important carrier<span>s</span> of the physico-chemical environments. Nowadays, the development of <em>in situ</em> microanalysis technology provides a new opportunity for further understanding the distribution and variation of trace element concentrations in foraminifera shells. In this study, we focus on the <em>in situ</em> Mg/Ca ratios in four planktonic foraminifera shells from the surface sediments of the northeastern slope of the South China Sea (SCS). The results of electron microprobe mapping indicate that <em>G. ruber</em> had periodic bands of high Mg contents and Mg/Ca ratios, consistent with the results of <span>LA-ICP-MS.</span> In contrast, <em>N. dutertrei</em>, <em>P. obliquiloculata,</em> and <em>G.inflata</em> had thick calcite layer with low Mg contents and Mg/Ca ratios. The Mg/Ca ratios of shells may be attributed to symbionts, but the physiological regulation may also have some contributions. Meanwhile, contaminants may lead to the relatively higher Mg/Ca ratios. Therefore, the large Mg/Ca variations in foraminifera shells are not only affected by the surrounding seawater temperature but also constrained by other factors. At last, we employed this method to reconstruct the Mg/Ca-SST in the northeastern SCS over the past ~3000 years. The similar trend to the previous SST records proves that this method is reliable. We hope that this method can be widely applied in the future due to the efficient, fast, and high spatial resolution with small sample amounts.</p>
Dataset to accompany publication "Photodeposition-Based Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton-Exchange Membrane Water Electrolysis with Low Iridium Loading"
<h2>Dataset description</h2> <p>This dataset provides the raw data for the manuscript "Photodeposition-Based Synthesis of TiO<sub>2</sub>@IrO<sub>x</sub> Core-Shell Catalyst for Proton-Exchange Membrane Water Electrolysis with Low Iridium Loading"<strong> </strong>published in <em>Advanced Science </em>on 14 June 2024 (DOI: <a href="https://doi.org/10.1002/advs.202402991">https://doi.org/10.1002/advs.202402991</a>).</p> <p>The data consists of:</p> <ol> <li>XRD pattern of TiO<sub>2</sub>@IrO<sub>x</sub> (40 wt% Ir) as shown in Fig. 3e.</li> <li>XPS spectra of 3 samples: <strong>2.1</strong> TiO<sub>2</sub>@IrO<sub>x</sub> (40 wt% Ir) as shown in Fig. 3f.; <strong>2.2 </strong>TiO<sub>2</sub>@IrO<sub>x</sub> (only shell) as shown in Fig. 3g; <strong>2.3</strong> TiO<sub>2</sub>@IrO<sub>x</sub> (photodeposited seeds) as shown in Fig. S8.</li> <li>Datasets for NanoCT of the TiO<sub>2</sub>@IrO<sub>x</sub> catalyst layer as shown in Fig. 5 a-c : <strong>3.1</strong> HRES Tilt series; <strong>3.2 </strong>reconstructed slices.</li> </ol> <h2>Abstract</h2> <p>The widespread application of green hydrogen production technologies requires cost reduction of crucial elements. To achieve this, a viable pathway to reduce the iridium loading in proton exchange membrane water electrolysis (PEMWE) is explored. Herein, we present a scalable synthesis method based on a photodeposition process for a TiO<sub>2</sub>@IrO<sub>x</sub> core-shell catalyst with a reduced iridium content as low as 40 wt%. Using this synthesis route, we obtain titania support particles homogeneously coated with a thin iridium oxide shell of only 2.1 ± 0.4 nm. The catalyst exhibits not only high ex situ activity, but also decent stability compared to commercially available catalysts. Furthermore, the unique core-shell structure provides a threefold increased electrical powder conductivity compared to structures without the shell. In addition, the low iridium content facilitates the fabrication of sufficiently thick catalyst layers at decreased iridium loadings mitigating the impact of crack formation in the catalyst layer during PEMWE operation. We demonstrate that the novel TiO<sub>2</sub>@IrO<sub>x</sub> core-shell catalyst clearly outperforms the commercial reference in single-cell tests with an iridium loading below 0.3 mg<sub>Ir</sub> cm<sup>‑2 </sup>exhibiting a superior iridium-specific power density of 17.9 kW g<sub>Ir</sub><sup>-1 </sup>compared to 10.4 kW g<sub>Ir</sub><sup>-1 </sup>for the commercial reference.</p>
Linked collectors and determiners for: BMSM Bailey-Matthews National Shell Museum.
Natural history specimen data linked to collectors and determiners held within, "BMSM Bailey-Matthews National Shell Museum". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/417f4d21-959b-4773-90a2-c38d1822d873">https://bionomia.net/dataset/417f4d21-959b-4773-90a2-c38d1822d873</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/417f4d21-959b-4773-90a2-c38d1822d873">https://gbif.org/dataset/417f4d21-959b-4773-90a2-c38d1822d873</a>. Formatted as a Frictionless Data package.
ISFAHAN SHAH MOSQUE- IRAN- SPACE BETWEEN THE SHELLS- 25-09-2018
<p>These images present the space between the double shell dome of the Shah Mosque in Isfahan including the Khashkhashi (stiffeners). </p>
Double shell domes in Tehran province- Iran (Emamzadeh Jafar Tomb, Emamzadeh Hasan Tomb, Emamzadeh Ghasem Tomb, Emamzadeh Mir MotaharTomb).
<p>These photos illustrate the construction details in the space between the double-shell domes including the inner dome, the outer dome, Khashkhashi (Stiffeners), wooden structural elements, and interventions. Emamzadeh Jafar Tomb (J1-J20), Emamzadeh Hasan Tomb (H1-H34), Emamzadeh Ghasem Tomb (G1-G4), Emamzadeh Mir Motahar(M1-M8).</p>
Double shell domes in Markazi province (2)_Iran (Emamzadeh Soleiman Tomb, Emamzadeh Ghasem e Kahak Tomb, Emamzadeh Ghasem e Shavarugh Tomb, Emamzadeh Mohammad Tomb,Emamzadeh Sahl ibne Ali Tomb).
<p>These photos illustrate the construction details in the space between the double-shell domes including the inner dome, the outer dome, Khashkhashi (Stiffeners), wooden structural elements, and interventions.</p> <ol> <li>Emamzadeh Soleiman e Naragh Tomb (S1-S41),</li> <li>Emamzadeh Ghasem e Shavarugh Tomb (G1-G17),</li> <li>Emamzadeh Ghasem e Kahak Tomb (K1-K16),</li> <li>Emamzadeh Mohammad Tomb (M1-M16),</li> <li>Emamzadeh Sahl ibne Ali Tomb (H1-H23).</li> </ol>
The atomic hydrogen shell around S187 region
<p>The shell around S187 is one of the nearby \Hii\ regions (1.4(0.26) pc). The shell has been studied in the \Hi\ line at 8 arcsec resolution, in molecular lines, also in infrared and radio continuum. The shell has a complex kinematical structure, including the expanding quasi-spherical atomic shell, molecular envelope, atomic sub-bubble inside the shell and two dense cores at the different stages of the star formation. The bright radio galaxy in the background gives the possibility of an accurate estimation of the properties of the atomic gas. The total atomic hydrogen mass is 113(34)~Msun, the median spin temperature is ~50K, the shell overall size is about ~2 pc with the wall width 0.2 pc. </p> <p><br> The attached datacube we obtained using the combined GMRT+CGPS data consist of atomic hydrogen 21-cm line. The data imaged at 8 arcsec resolution which is the highest for the Galactic observations to our knowledge.<br> <br> This work was supported by the Russian Science Foundation under project No. 17-12-01256</p>
FIG. 1 in Caravans, camel wrestling and cowrie shells: towards a social zooarchaeology of camel hybridization in Anatolia and adjacent regions
FIG. 1. — Drawing, second half of the fifteenth century, Istanbul, Topkapı Sarayı Library (After Adamova 2004: fig. 2).
FIG. 2 in Caravans, camel wrestling and cowrie shells: towards a social zooarchaeology of camel hybridization in Anatolia and adjacent regions
FIG. 2. — Location of place names mentioned in the text (circles, ancient place names, numbers refer to sites according to Table 2; squares, modern place names).
Figure 16 in Daphniola Radoman, 1973 (Gastropoda: Hydrobiidae): shell biometry, mtDNA, and the Pliocene flooding
Figure 16. The geography of the Mediterranean in the Late Miocene (Messinian salinity crisis; after Banarescu 1992) and the localities of the studied populations in the Recent.
Figures 2–13 in Daphniola Radoman, 1973 (Gastropoda: Hydrobiidae): shell biometry, mtDNA, and the Pliocene flooding
Figures 2–13. Shells of Daphniola. (2–6) D. exigua, Agia Paraskevi. (7–10) D. louisi, Kessariani. (11–13) D. graeca, Daphne spring. Scale bar: 0.5 mm
Figure 1 in Daphniola Radoman, 1973 (Gastropoda: Hydrobiidae): shell biometry, mtDNA, and the Pliocene flooding
Figure 1. Shell morphometry measurements: a, height of shell; b, width of body whorl; c, height of mouth; d, height of spire; e, width of mouth; 2, angle of spire.
Figure 15 in Daphniola Radoman, 1973 (Gastropoda: Hydrobiidae): shell biometry, mtDNA, and the Pliocene flooding
Figure 15. Phylogram computed with maximum likelihood, Grossuana codreanui and Bythinella austriaca as outgroup; bootstrap supports (10,000 replicates) given for all branches whose support exceeded 50%.
Fig. 1 in A Second Finding Of Vercoia Interrupta Kim & Fujita, 2004 (Crustacea, Decapoda, Crangonidae), A Remarkable Shrimp Imitating Dead Snail Shells
Fig. 1. Vercoia interrupta Kim & Fujita, 2004: A–D, ovigerous female from Balicasag Island, Panglao, Bohol, Philippines; E–G, ovigerous female from Ponson Island, Pilar, Cebu, Philippines. A, recently preserved specimen, lateral view; B, same, dorsal view; C, living shrimp in situ, showing microhabitat; D, same, close-up; E, living shrimp (different individual) in situ, lateral view; F, same, dorsolateral view; G, same, anterodorsal view. (C–G, photographs by Guido Poppe).
Fig. 4. Shell characteristics for further comparison. A in Overlooked for a century: Taxonomic status of Camaena saturnia (Gould, 1846) (Eupulmonata: Camaenidae)
Fig. 4. Shell characteristics for further comparison. A, Camaena ochthoplax (Benson, 1860), specimen SMF 26478/1 from Naga Burge; B, Camaena pachychila (Smith, 1893), syntype NHMUK 1893.2.26.2.3 from Annam; C, Camaena vanbuensis Smith, 1896, syntype NHMUK 1896.1.25.1 from Vanbu, Tonkin; D, Camaena suprafusca Möllendorff, 1898, lectotype SMF 8105/1 from Boloven, Annam.
Figure 2 in Shell geometric morphometrics in Biomphalaria glabrata (Mollusca: Planorbidae) uninfected and infected with Schistosoma mansoni
Figure 2. Principal component analysis diagram of the first two principal components (within percentage explained variance contribution) from 60 Biomphalaria glabrata specimens, uninfected (black dots) and infected with Schistosoma mansoni (gray dots). Ellipse encloses 90% of data for each group.
Figure 1 in Shell geometric morphometrics in Biomphalaria glabrata (Mollusca: Planorbidae) uninfected and infected with Schistosoma mansoni
Figure 1. Shell of Biomphalaria glabrata showing the landmarks (LM1–LM12) disposition. White landmarks correspond to type I and II landmarks, while the gray to semilandmarks.
Figure 3 in Shell geometric morphometrics in Biomphalaria glabrata (Mollusca: Planorbidae) uninfected and infected with Schistosoma mansoni
Figure 3. Grid deformation showing differences in the Principal Component 1 (PC1) between the mean configuration of Biomphalaria glabrata uninfected and infected with Schistosome mansoni.
Fig. 5. Berthelinia singaporensis development. A–D in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development
Fig. 5. Berthelinia singaporensis development. A–D, SEM micrographs of larval shells of newly hatched veligers from different aspects, showing sinistral coiling, suture (C), and faint growth lines (C–D); E, SEM micrograph of larval operculum; F, light micrograph of newly hatched veliger larva showing the radula (circled).
Fig. 3 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development
Fig. 3. Intra-capsular development of Berthelinia singaporensis. A, complete gastrula (day 3); B, early veliger, shell not coiled; velum visible (day 4); C, D, early veliger (day 5) with pigment along shell aperture and in suture; E, veliger larvae (day 6) with eyespots; F, large veliger larvae (day 10) with operculum (arrowhead) and foot (arrow).
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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.