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86 results for “Calcium carbonate”
Nano-sized calcium carbonate particles in cement mortars (DS18)
<p>This dataset will provide the selection of the optimal mix-design of cement mortars, optimizing the characteristics of nanoCaCO3 particles (additional percentages, morphology, particle size distribution, crystal phase) according to their use in cement-based composites. These commercial nanoparticles have characteristics comparable with those of the synthesized particles used up to now in the RECODE project.</p>
RECODE_DS19.Toxicological profile of calcium carbonate nanoparticles for industrial applications
<p>The documentation will include: for the <em>in vitro</em> and <em>in vivo </em>studies all the data acquired after the exposure of cells or zebrafish to the nano-sized CaCO3 particles.</p>
The gamaproteobacterium Achromatium forms intracellular amorphous calcium carbonate and not (crystalline) calcite- dataset
<p>This is the dataset accompanying the paper published in geobiology and titled <em>The gamaproteobacterium Achromatium forms intracellular amorphous calcium carbonate and not (crystalline) calcite</em></p> <p>It comprises SEM and light microscopy images, Raman spectra (txt files) and one excel files containing the results of Raman spectra fits.</p>
Rawdata for publication: Observation of Transient Prenucleation Species of Calcium Carbonate by DNP-Enhanced NMR
<p>This is the raw data set for the publication:</p> <p>Observation of Transient Prenucleation Species of Calcium Carbonate by DNP-Enhanced NMR</p> <p>by</p> <p>Martins Balodis, Yu Rao, Gabriele Stevanato, Matthias Kellner, Josephine Meibom, Mattia Negroni, Bradley F. Chmelka, Lyndon Emsley .</p> <p>https://pubs.acs.org/doi/10.1021/acs.jpclett.4c01588</p>
Fig. 8 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 8. Scleractinian Trochocyathus egeri (White 1879), Upper Campanian to Maastrichtian (Upper Cretaceous), Pierre shale (upper part), Dry Creek, Black Hills (South Dakota, USA); USNM 75221. Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers; two enlargements (A, B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 40–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 11. Scleractinian Pachysolenia cylindrica Cuif, 1975 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 11. Scleractinian Pachysolenia cylindrica Cuif, 1975, lower Norian (Upper Triassic), Alakir Çay, Turkey; ZPAL V.31/7. Polished and etched (formic acid, 1%, 20s) pachythecal wall consisted of aragonite fibers; two enlargements (A, B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Skeletal regions that show effects of oxidizing solution action (upper part of images) do not exhibit distinct nanogranular pattern. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 15 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 15. Galaxea fascicularis (Linnaeus, 1767), skeleton and calicoblastic layer interface. A. FESEM image (reproduced after Clode and Marshall 2003a: figs. 1, 2) of frozen−hydrated specimen showing: nanogranular structure (B, close−up) of calcareous fibers at their entire length (non−etched state), cross−sections of spindle ectodermal cells with spherical intercellular vesicles, and fibrillar organic matrix (asterisk). C. Close−up of mesh−like, fibrillar organic matrix at skeleton−ectoderm interface with attached small nodular structures (white arrows) that, most likely, correspond to calcium enriched regions indicated by X−ray analysis.
Fig. 1 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 1. Synthetic aragonite crystals. Seven day old cluster of acicular aragonite crystals, overall (A) and close−up (B) views. Two day old cluster of acicular aragonite (C) with growth steps (D). No distinct nanograins are recognizable on crystal surface before and after (E–H) treatment with oxidizing solution. AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (E, G), and deflection (F, H) images of 1×1 µm (E, F) and 500×500 nm (G, H) crystal face. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 7 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 7. Scleractinian Rennensismilia complanata (Goldfuss, 1826), Santonian (Upper Cretaceous), Lower Gosau beds, near Gosau, Austria; USNM 499247. Polished and etched (formic acid, 1%, 20s) septum with bundles of aragonite fibers enveloped by structures with positive etching relief interpreted by Sorauf (1999) as sheaths of proteinaceous matrix (A, C, same skeletal regions in different magnifications); in places skeletal etched fibers show regular discontinuities similar to that of extant zooxanthellates (B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (D, F), and deflection (E, G) images of 2×2 µm (D, E) and 500×500 nm (F, G) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 4 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 4. Calcareous sponge Petrobiona massiliana Vacelet and Lévi, 1958, Recent, Marseille, submarine cave, "Grotte du Figuier", depth 10 m; ZPAL V.31/3. Polished and etched (formic acid, 1%, 20s) basal skeleton (spherulites) with calcite fibers; two enlargements (A, B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 6. Scleractinian Paracyathus cupula Reuss, 1871 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 6. Scleractinian Paracyathus cupula Reuss, 1871, Miocene (Neogene), Korytnica, Holy Cross Mts, Poland; ZPAL V.31/5. Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers; two enlargements (A, B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 16 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 16. Main nanostructural patterns of calcium carbonate crystals and their possible diagenetic pathways. Nanostructural spectrum encompasses: crystals without nanograins (A, based on synthetically produced CaCO3 crystals, Fig. 1); crystals composed entirely of nanograins (C, based on Recent biocrystals formed in hydro−organic gel); and crystals with intermediate nanostructural pattern, having a bumpy texture representing degraded/ fused nanograins (B, based on P. cylindrica skeleton, Fig. 11).
Fig. 3 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 3. Scleractinian Goniastrea retiformis (Lamarck, 1816), Recent, Saipan (Cloud Locality A−12, Northern Mariana Islands, Pacific Ocean); ZPAL V.31/2. Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers in two (A, B) enlargements; note negative relief of etched organic components within fibers. AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 14 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 14. Thermograms showing direct thermogravimetrical (TG; milligrams), differential thermogravimetrical (DTG; arbitrary units), and differential thermo−analytical (DTA; arbitrary units) curves of synthethic aragonite (A) and three samples with two different nanostructural patterns: Triassic Pachysolenia cylindrica (B) without distinct nanograins; Jurassic Isastraea cf. bernensis (C) and Recent Favia stelligera (C) with well developed nanograins. Assumed amount of intraskeletal hydrated organic components was calculated based on distinct weight loss of 400 mg sample that occurred at ca. 300–450°C.
Fig. 2 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 2. Scleractinian Favia stelligera (Dana, 1846), Recent, Lizard Island (Great Barrier Reef, Pacific Ocean), depth 5–10 m; ZPAL V.31/1 (fragment of colony collected by Ann Budd). Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers in two (A, B) enlargements; note negative relief of etched organic components in dRAF zone (upper A) and between fiber's layers. AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 5. Stylasterid Adelopora fragilis Cairns, 1991 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 5. Stylasterid Adelopora fragilis Cairns, 1991, Recent, New Caledonia, ORSTOM 5, DW 490, 18°54.9'S/163°24,3'E, depth 230 m; ZPAL V.31/4. Polished and etched (formic acid, 1%, 20s) coenosteum with aragonite fibers; two enlargements (A, B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 9 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 9. Scleractinian Isastraea cf. bernensis Étallon in Thurmann and Étallon, 1864. Oxfordian (Upper Jurassic), Ostromice, western Pomerania, Poland; ZPAL H.IV/303. Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers; two enlargements (A, B). AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 60 (commonly 80) –100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 12 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 12. Sparry calcite developed between septa of fossil scleractinian corals. A. ZPAL V.31/8 (lower Maastrichtian, Upper Cretaceous, Lubycza Królewska, Lublin Upland, eastern Poland). B. ZPAL V.31/9 (Carnian, Upper Triassic, Alpe di Specie, Dolomites, Italy). Polished and etched (formic acid, 1%, 20s) ZPAL V.31/8 sparry calcite in two enlargements (A1, A3). Back−Scattered Electron Microscopy image (A2) shows complex history of idividual calcite grain, highlighting zones of different elemental composition: those with elements of lower atomic numbers are darker (core of the grain outlines with arrows), whereas those of higher atomic numbers are lighter (outer part). A4–A7, B1, B2, AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (A4, A6, B1), and deflection (A5, A7, B2) images of 2×2 µm (A4, A5) and 500×500 nm (A6, A7, B1, B2) sample surface. Nanograins on A4–A7 are ca. 60–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Fig. 10 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals
Fig. 10. Tropiastraeid scleractinian, undetermined. Upper Carnian (Upper Triassic), Alpe di Specie, Dolomites, Italy; ZPAL V.31/6. Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers; two enlargements (A, B); fiber's tapering (e.g., arrow in B) is possibly related to original organic matter enrichment zones. AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 60 (commonly 80) –100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.
Data for A multi-phase biogeochemical model for mitigating earthquake-induced liquefaction via microbially induced desaturation and calcium carbonate precipitation
<p>This data accompanies the paper published in Biogeosciences, which can be found at https://doi.org/10.5194/egusphere-2022-1419.</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.