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132 results for “eggshell”
Figure 8 in Breaking through the eggshell: embryonic development of the premaxillary dentition in Lacerta agilis (Squamata: Unidentata) with special emphasis on the egg tooth
Figure 8. The egg tooth of Lacerta agilis at developmental stage 35. A, stereomicroscope photomicrograph of the anterior snout, left lateral view (mirrored), early developmental stage 35. B, stereomicroscope photomicrograph of the anterior snout, left lateral view (mirrored), at late developmental stage 35. C, stereomicroscope photomicrograph of the anterior palate, early developmental stage 35. D, stereomicroscope photomicrograph of the anterior palate, late developmental stage 35. E, scanning electron micrograph of the anterior palate, late developmental stage 35. F, magnification of the area from the box in E showing the egg tooth. G, magnification of the area from the box in F showing the small bulges (arrowheads) on the lateral border of the egg tooth. Scale bars: 200 μm in A–D; 50 μm in E, F; 5 μm in G.
Data from: Thick eggshells of brood parasitic cowbirds protect their eggs and damage host eggs during laying
Brood parasites lay thick-shelled eggs and numerous hypotheses have been proposed to explain the significance of this trait. We examined whether thick eggshells protect the parasite egg during laying events. We used eggs of the parasitic shiny cowbird (Molothrus bonariensis) and its hosts, the house wren (Troglodytes aedon) and chalk-browed mockingbird (Mimus saturninus) in South America and the eggs of the parasitic brown-headed cowbird (M. ater) and its hosts the house wren and red-winged blackbird (Agelaius phoeniceus) in North America. We experimentally dropped parasite eggs onto host eggs to simulate laying by the parasite, parasite eggs onto parasite eggs to simulate multiple parasitism, host eggs onto parasite eggs to simulate hosts laying from the height cowbirds lay, and stirred eggs to simulate jostling that may occur when cowbirds and hosts interact during laying events. We found that cowbird eggs were significantly less likely to be damaged than host eggs when they were laid onto a host egg and when host and cowbird eggs were laid onto them. There was minimal damage to eggs during jostling experiments, thereby failing to support the hypothesis that thick eggshells provide protection when eggs are jostled. These findings support the hypotheses that thick eggshells resist damage when laid from an elevated position, when additional cowbird eggs are laid onto them in multiply parasitized nests, and these eggs also damage host eggs when laid.
Data from: Discovery of proteinaceous moieties in Late Cretaceous dinosaur eggshells
<p>The documentation of proteinaceous soft tissues in fossils from deep time remains controversial. Often this has been attributed to the laboratory or other modes of modern contamination. Here we provide incontrovertible evidence for the preservation of proteinaceous moieties in the Maastrichtian dinosaur eggshells using pyrolysis-GC×GC-TOFMS. The presence of nitrogen-bearing organic molecules along with diketodipyrrole suggest that the proteinaceous moieties can survive diagenesis. The preservation of these proteinaceous moieties has been attributed to deposition in a palustrine flat environment under subaerial conditions and entrapment of organic material by the eggshell calcitic units. The present study demonstrates that the preservation of nitrogen-bearing macromolecules in Mesozoic fossil remains is not impossible provided the depositional environments and diagenetic processes are propitious. The survival of nitrogen-bearing macromolecule in deep time under subaerial depositional settings will open a new avenue to the research on soft tissue preservation.</p>
Supplementary data for Yeoman's et al. in review "Waterfowl eggshell refines palaeoenvironmental reconstruction and multi-species niche construction at the Pleistocene-Holocene transition in the Levant"
<p>This upload contains MALDI-TOF mass spectra, averaged from replicates or as single-best spectrum, as .txt files. Data derive from archaeological eggshells samples for the paper "Waterfowl eggshell refines palaeoenvironmental reconstruction and multi-species niche construction at the Pleistocene-Holocene transition in the Levant". </p> <p>Sample preparation:</p> <p>Eggshell was recovered from multiple contexts at Shubayqa 1 and Shubayqa 6 from flotation samples [screened with 1mm mesh]. A sample of 34 eggshell fragments were selected for preliminary analysis across seven excavation contexts. Samples were processed according to Demarchi et al., (2022). Briefly, 10-30 mg of sample were ground to a powder and treated with bleach (NaOCl 12-15% w/v) for 72 hours. Samples were washed thoroughly and demineralised in 0.6M hydrochloridric acid (HCl) prior to filtration with 3000 Da Nanosep micro-ultrafiltration cells. Sulfide bonds were reduced and alkylated using dithiothreitol (1M, aqueous solution) and iodoacetamide (0.5 M, aqueous solution) and the samples were digested in trypsin overnight at 37 °C. Following digestion, peptide digests were purified using C18 Zip-tips according to the manufacturer’s directions, prior to spotting. Samples were analysed in triplicate or duplicate by MALDI-MS (Bruker Microflex MALDI-TOF mass spectrometer).</p>
Efficacy & Safety Study of Natural Eggshell Membrane (NEM) for the Treatment of Joint & Connective Tissue Disorders
ClinicalTrials.gov study NCT00750854. IPD Sharing: NO. Countries: 1. Publications: 1.
Efficacy & Safety Study Evaluating Natural Eggshell Membrane (NEM) in the Treatment of Osteoarthritis
ClinicalTrials.gov study NCT00750477. IPD Sharing: NO. Countries: 1. Publications: 1.
Pilot Study of the Efficacy & Safety of Natural Eggshell Membrane (NEM) for Joint & Connective Tissue Disorders
ClinicalTrials.gov study NCT00750230. IPD Sharing: NO. Countries: 1. Publications: 1.
Eggshell Membrane Beauty From Within Trial
ClinicalTrials.gov study NCT06148337. IPD Sharing: NO. Countries: 1. Publications: 0.
A Study Comparing Eggshell Based and Gold Standard Materials to Heal Deep Tooth Damage in Adult Molars
ClinicalTrials.gov study NCT07183514. IPD Sharing: NO. Countries: 1. Publications: 1.
Comparative Evaluation of Eggshell Powder in Primary Teeth Pulpotomy
ClinicalTrials.gov study NCT05812053. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Using Eggshell Calcium to Mitigate Fluorosis in Ethiopia
ClinicalTrials.gov study NCT03355222. IPD Sharing: NO. Countries: 1. Publications: 2.
Promotion of Egg and Eggshell Powder Consumption Improve Nutritional Status of Children in Halaba Ethiopia
ClinicalTrials.gov study NCT02791100. IPD Sharing: NO. Countries: 1. Publications: 4.
Mussentuchit member fossil eggshell light microscope photographs and corresponding metrics
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Data from: Eggshell palaeogenomics: Palaeognath evolutionary history revealed through ancient nuclear and mitochondrial DNA from Madagascan elephant bird (Aepyornis sp.) eggshell
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Data from: Experimental old nest material predicts hoopoe (Upupa epops) eggshell and uropygial gland microbiota
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Data from: Plumage and eggshell colouration covary with the level of sex-specific parental contributions to nest building in birds
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Data from: Thick eggshells of brood parasitic cowbirds protect their eggs and damage host eggs during laying
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Quantitative genetics of eggshell colouration
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Data from: Avian mitochondrial genomes retrieved from museum eggshell
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Data from: Great spotted cuckoo eggshell microstructure characteristics can make eggs stronger
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DANDI Archive for NWB datasets
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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
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