Relevant bibliographies by topics / Eggshells

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Eggshells'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 February 2023

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Journal articles on the topic "Eggshells"

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Chen, Li, Xiaorong Gu, Xuetao Huang, Rui Liu, Jinxiu Li, Yiqing Hu, Guoqin Li, et al. "Two cis-regulatory SNPs upstream of ABCG2 synergistically cause the blue eggshell phenotype in the duck." PLOS Genetics 16, no. 11 (November 13, 2020): e1009119. http://dx.doi.org/10.1371/journal.pgen.1009119.

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Avian eggshell color is an interesting genetic trait. Here, we report that the blue eggshell color of the domestic duck is caused by two cis-regulatory G to A transitions upstream of ABCG2, which encodes an efflux transporter. The juxtaposed blue eggshell allele A-A exhibited higher promoter activity and stronger nuclear protein binding capacity than the white eggshell allele G-G. Transcription factor analysis suggested differential binding capability of CTCF between blue eggshell and white eggshell alleles. Knockdown of CTCF expression significantly decreased the promoter activity of the blue eggshell but not the white eggshell allele. DNA methylation analysis revealed similar high methylation of the region upstream of the CTCF binding sites in both blue-eggshelled and white-eggshelled ducks. However, DNA methylation levels downstream of the binding sites were decreased and 35% lower in blue-eggshelled ducks than in white-eggshelled ducks. Consistent with the in vitro regulatory pattern of causative sites, ABCG2 exhibited higher expression in uteruses of blue-eggshelled ducks and also showed polarized distribution in their endometrial epithelial cells, distributing at the apical surface of endometrial epithelial cells and with orientation toward the uterine cavity, where the eggshell is pigmented. In conclusion, our results suggest that two cis-regulatory SNPs upstream of ABCG2 are the causative mutations for blue eggshells in ducks. The blue eggshell variant up-regulated ABCG2 expression through recruiting CTCF binding, which may function as a barrier element to shield the downstream region from high methylation levels present upstream. ABCG2 was identified as the only candidate causative gene for blue eggshells; it may function as an efflux transporter of biliverdin to the uterine cavity.
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Severa, Libor, Jaroslav Buchar, and Jiří Votava. "New approach of eggshell mechanical properties determinantion." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 58, no. 1 (2010): 161–66. http://dx.doi.org/10.11118/actaun201058010161.

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The paper describes a new approach for determination of mechanical properties of hen’s eggshell. The suitability and applicability of a Berkovich indentation is discussed. The eggshells were tested in the area surrounding equator line. The deformation modes active during indentation have been examinined from the shape of load-displacement curves. According to measured dependencies, the eggshel shown an viscous-elastic deformation.The values of Young’s modulus E obtained from radial and tangential directions did not vary significantly. This fact shows on isotropic nature of eggshell structure. It was found that values of E do not significantly change neither around the cir­cum­fe­ren­ce of the equator. The values obtained within this research correspond to values reported in literature and obtained on macroscopic samples. Nanoindentation was found to be a precise and powerful tool, suitable for determining local variations of mechanical properties of eggshells.
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Spelta, Jenniffer Syreetta de Oliveira, and André Gustavo de Sousa Galdino. "BIOCERAMIC COMPOSITE: HEN’S EGGSHELL CHARACTERIZATION AND MAIN APPLICATIONS." Revista Ifes Ciência 4, no. 1 (June 15, 2018): 9–20. http://dx.doi.org/10.36524/ric.v4i1.323.

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The chicken eggshell is a bioceramic composite which constitutes a solid waste material whose final disposal is complex and expensive. Brazil generates significant amounts of eggshell residue. This work aimed to characterize the eggshells of white, red and backyard hens and indicate their technological potential as raw material for ceramic products manufacturing. The eggshells were crushed, ground, sifted in a ABNT number 80 sieve and subsequently analyzed by X-rays fluorescence (XRF), X-ray diffraction (XRD) and thermal analyses (DTA and TGA). Through XRF it was observed that the main constituent of eggshell is calcium oxide (CaO), with different percentages between the eggshell types. XRD analysis indicated that the chicken eggshells used in this work are mainly composed of CaCO3. DTA and TGA demonstrated that the thermal decomposition of the chicken eggshells occurs in three events: water removal; decomposition of organic matter; and decomposition of CaCO3 in CaO and CO2. By reviewing the literature, it was verified that chicken eggshells have important applications since they can be used in biomedicine, civil construction, food industries and as soil nutrients. As a result, it is possible to conclude that the chicken eggshell is rich in CaCO3 and can be easily calcined to obtain CaO.
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Dwivedi, Shashi Prakash, Satpal Sharma, and Raghvendra Kumar Mishra. "Influence of precipitation hardening parameters on the microstructure and mechanical properties of extruded AA2014/eggshells green composites." Journal of Composite Materials 51, no. 30 (March 29, 2017): 4261–71. http://dx.doi.org/10.1177/0021998317701558.

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The AA2014/5 wt. % carbonized eggshells metal matrix composite used in this study was fabricated by electromagnetic stir casting technique and immediately extruded on universal testing machine at 60 MPa using cylindrical H13 tool steel die coated with graphite to avoid upper flow of eggshells particles and to improve wettability of eggshells with AA2014 alloy. Microstructures of composites show some agglomerations in non-extruded samples while uniform distribution of carbonized eggshell particles. Optimum combination of precipitation hardening parameters achieved using response surface methodology to further improve the properties of AA2014/5 wt. % eggshell composites. Optimum values of solutionizing time, aging temperature and aging time were found to be 4.5 h, 250℃ and 13.5 h, respectively. More grain refinement of extruded AA2014/5 wt. % eggshell composites were observed after heat treatment at optimum precipitation hardening parameters. After heat treatment, fractographs of the AA2014/5 wt. % eggshells composite showed that fracture is dominated by trans-granular type. Density of the AA2014 is 5% higher than AA2014/5 wt. % eggshells metal matrix composite. It is observed that mechanical properties improve when carbonized eggshell particles are reinforced in matrix AA2014 aluminium alloy. After the heat treatment at optimum precipitation hardening parameters, mechanical properties are further improved.
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Arianto, Rico, Siti Nani Nurbaeti, Fajar Nugraha, Inarah Fajriaty, Hadi Kurniawan, and Adnan Pramudio. "Pengaruh Isolasi Cangkang Telur Ayam Ras Petelur Terhadap Kadar Abu." Journal Syifa Sciences and Clinical Research 4, no. 2 (April 8, 2022): 247–52. http://dx.doi.org/10.37311/jsscr.v4i2.13982.

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Eggshell powder for laying hens contains calcium carbonate CaCO3 (98%) and calcium (28%), efficacious as an antiseptic, antibacterial, and the development of the mineral apatite in the formation of bones and teeth. Eggshell powder is an organic waste that has the potential to be used as a supplement material for calcium sources for humans. However, the content of eggshells consists of inorganic compounds that produce ash. Eggshells as a supplement material must meet quality and safety standards, but this has never been done. Therefore, in this study, an ash content test was carried out with the aim of knowing the inorganic content in the isolation of eggshells of laying hens. Eggshells were isolated by demineralization and deproteination processes. The test results showed that the ash content in the eggshells of laying hens was 95.13%, while in the isolation results the ash content was 96.13%.
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Hasanah, Ulfa Imroathul, Budi Utami, and Endang Susilowati. "Combination of Corn Waste and Egg Shell as Zn Metal Adsorbent with Batch System." JKPK (Jurnal Kimia dan Pendidikan Kimia) 7, no. 2 (August 30, 2022): 223. http://dx.doi.org/10.20961/jkpk.v7i2.55440.

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<p>This study aims to determine: the ability of corn cobs and eggshells as Zn metal adsorbents, functional groups of corn cobs and eggshells adsorbent, what isotherm patterns occur in the adsorbent corn cobs and eggshells in adsorbing Zn metal, the optimum ratio and optimum mass of the adsorbent composition of corn cobs and eggshells in Zn metal adsorption, the optimum contact time for adsorbent corn cobs and eggshell in adsorbing Zn metal, the optimum concentration of adsorbate to be adsorbed by corn cobs and eggshell adsorbents. This study used an experimental method in the laboratory. characterization includes functional groups using FTIR, and test the effectiveness of adsorbents using the AAS instrument. Kinetic analysis of adsorbent by adsorption isotherm with Langmuir isotherm, Freundlich isotherm, Temkin isotherm, and dubinin-radushkevivh isotherm. The results showed that: Corn cobs and eggshells can be used as zinc metal adsorbents; in the corn cobs adsorbent, there is a functional group -OH at wave number 3415,15 cm<sup>-1</sup> and in the eggshell, there is a bent vibration of calcium carbonate at wave number 3400,65 cm<sup>-1</sup>, the adsorption process of Zn metal by adsorbent corn cobs and egg shells follows the Langmuir isotherm pattern (chemical adsorption), the comparison of the optimum composition and mass of the adsorbent corn cobs and eggshells in Zn metal adsorption are 1:2 and 0,15 grams with Zn metal adsorbed by 80,4571%, the optimum contact time for the adsorbent corn cobs and eggshells in adsorbing Zn metal is 90 minutes with the percentage of absorbed Zn metal concentration is 75,5957%, and the optimum concentration of adsorbate for adsorbed by corn cob and eggshell adsorbents is 1 mg/L with adsorbed Zn percentage of 82,8377%.</p>
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Yu, Yue, Zhanming Li, and Jinming Pan. "Changes in pigment, spectral transmission and element content of pink chicken eggshells with different pigment intensity during incubation." PeerJ 4 (March 17, 2016): e1825. http://dx.doi.org/10.7717/peerj.1825.

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Objective.The objective of this study was to investigate changes in pigment, spectral transmission and element content of chicken eggshells with different intensities of pink pigment during the incubation period. We also investigated the effects of the region (small pole, equator and large pole) and pink pigment intensity of the chicken eggshell on the percent transmission of light passing through the chicken eggshells.Method.Eggs of comparable weight from a meat-type breeder (Meihuang) were used, and divided based on three levels of pink pigment (light, medium and dark) in the eggshells. During the incubation (0–21 d), the values of the eggshell pigment (ΔE,L∗,a∗,b∗) were measured. The percent transmission of light for different regions and intensities of eggshell pigmentation was measured by using the visible wavelength range of 380–780 nm.Result.Three measured indicators of eggshell color, ΔE,L∗anda∗, did not change significantly during incubation. Compared with other regions and pigment intensities, eggshell at the small pole and with light pigmentation intensity showed the highest percent transmission of light. The transmission value varied significantly (P< 0.001) with incubation time. The element analysis of eggshells with different levels of pink pigment showed that the potassium content of the eggshells for all pigment levels decreased significantly during incubation.Conclusion.In summary, pigment intensity and the region of the eggshell influenced the percent transmission of light of eggshell. Differences in the spectral characteristics of different eggshells may influence the effects of photostimulation during the incubation of eggs. All of these results will be applicable for perfecting the design of light intensity for lighted incubation to improve productivity.
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Yang, Tzu-Ruei, Ying-Hsuan Chen, Jasmina Wiemann, Beate Spiering, and P. Martin Sander. "Fossil eggshell cuticle elucidates dinosaur nesting ecology." PeerJ 6 (July 6, 2018): e5144. http://dx.doi.org/10.7717/peerj.5144.

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The cuticle layer consisting mainly of lipids and hydroxyapatite (HAp) atop the mineralized avian eggshell is a protective structure that prevents the egg from dehydration and microbial invasions. Previous ornithological studies have revealed that the cuticle layer is also involved in modulating the reflectance of eggshells in addition to pigments (protoporphyrin and biliverdin). Thus, the cuticle layer represents a crucial trait that delivers ecological signals. While present in most modern birds, direct evidence for cuticle preservation in stem birds and non-avian dinosaurs is yet missing. Here we present the first direct and chemical evidence for the preservation of the cuticle layer on dinosaur eggshells. We analyze several theropod eggshells from various localities, including oviraptorid Macroolithus yaotunensis eggshells from the Late Cretaceous deposits of Henan, Jiangxi, and Guangdong in China and alvarezsaurid Triprismatoolithus eggshell from the Two Medicine Formation of Montana, United States, with the scanning electron microscope (SEM), electron probe micro-analysis (EPMA), and Raman spectroscopy (RS). The elemental analysis with EPMA shows high concentration of phosphorus at the boundary between the eggshell and sediment, representing the hydroxyapatitic cuticle layer (HAp). Depletion of phosphorus in sediment excludes the allochthonous origin of the phosphorus in these eggshells. The chemometric analysis of Raman spectra collected from fossil and extant eggs provides further supportive evidence for the cuticle preservation in oviraptorid and probable alvarezsaurid eggshells. In accordance with our previous discovery of pigments preserved in Cretaceous oviraptorid dinosaur eggshells, we validate the cuticle preservation on dinosaur eggshells through deep time and offer a yet unexplored resource for chemical studies targeting the evolution of dinosaur nesting ecology. Our study also suggests that the cuticle structure can be traced far back to maniraptoran dinosaurs and enhance their reproductive success in a warm and mesic habitat such as Montana and southern China during the Late Cretaceous.
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Ogah, C. O., K. U. Nwaeze, and O. O. Adetifa. "Analysis of Brown and White Chicken Eggshells for Content of Calcium Carbonate." Journal of Basic and Social Pharmacy Research 2, no. 2 (2021): 27–34. http://dx.doi.org/10.52968/27457333.

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Background: An eggshell is the hard outer covering of an egg that serves to protect it from damage, microbial contamination and desiccation. The major component of the eggshell is calcium carbonate, which provides it with hardness and strength. Calcium carbonate content of eggshells contributes to the overall quality of the egg and eggs are an essential component of human and animal nutrition. Eggshells containing high calcium carbonate can also be processed and used as calcium supplement for bone and teeth health in vulnerable populations. Objectives: This study determined the calcium carbonate content of brown and white chicken eggshells sourced from Lagos markets and the effect of boiling on same. Materials and method: Eggs were sourced randomly from three markets in Lagos metropolis and the shells were washed and dried. The dry shells were pulverized and analyzed for calcium carbonate using the back titration method. Each sample (0.5 g) was reacted with excess 1.0 M HCl and the excess acid titrated with 0.1 M NaOH. The calcium carbonate content of each sample was calculated from the difference between the total number of moles of HCl used and that titrated as excess. Results: The results show that the eggshells studied have high calcium carbonate content and brown eggshells contained higher levels of calcium carbonate (95%) than white eggshells (91%). Boiling did not significantly reduce the calcium carbonate content of both brown and white eggshells. Eggshells from the three markets were similar in their content of calcium carbonate. Conclusion: This study shows that brown eggshells have a higher calcium carbonate content than white eggshells and boiling of eggs does not significantly reduce the calcium carbonate content of the shells.
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Hussien, Hani M. "Ratio and Temperature Dependence of Dielectric Properties and AC Conductivity of Polyvinyl Alcohol / Iraqi Eggshell Composites." NeuroQuantology 20, no. 1 (February 4, 2022): 49–55. http://dx.doi.org/10.14704/nq.2022.20.1.nq22007.

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The polymer composites used in the present study were made of polyvinyl alcohol (PVA) as a matrix and Iraqi eggshell powder as filler. The eggshell powder was obtained from the waste of Iraqi chicken eggshell. The solution-casting method was used to prepare PVA/eggshell powder composite films with ratios (10, 30, and 50 wt %) of eggshell powder. The dielectric properties (dielectric constant, and power factor) and AC conductivity were investigated in the frequency range 100 kHz to 5 MHz at room temperature and different temperature (50, 70, 90, and 110 oC). It was found that the PVA sample and PVA samples containing 10% and 50% of eggshells had a dielectric constant that increases slightly with frequency up to 200 kHz, after which the decrease in the dielectric constant was very slight. While the sample of PVA containing 30% eggshell powder, the dielectric constant decreased slightly with increasing frequency. By studying the behavior of dielectric constant as a function of eggshell additives it was fond that the sample containing 50% of the eggshell powder has lowest values of the dielectric constant while the sample containing 10% of the eggshell powder has the highest values. The power factor decreased at a very small rate with increasing frequency and generally, the addition of eggshells led to a decrease in the power factor. At frequencies greater than 1MHz, it was found that the sample containing 10% eggshells has the highest conductivity while the samples containing 30% eggshells has lowest values. About the effect of temperature on the studied properties it was found that the dielectric constant and power factor generally increased with increasing temperature. Also, the values of the dielectric constant for samples containing 50% eggshell powder were lower than the other samples. It is generally found that the conductivity increased with frequency. At different temperatures it was found that sample containing 10% eggshells powder has close values of electrical conductivity. Generally, the samples had the highest conductivity at a temperature of 110 oC.
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Dissertations / Theses on the topic "Eggshells"

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Brulez, Kaat. "Why are passerine eggshells spotted? : using calcium supplementation as a tool to explore eggshell pigmentation." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4619/.

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The eggshells of many avian species are spotted in appearance but the functional significance of such maculation is poorly understood. Protoporphyrin, responsible for brownish-red colouring on eggshells, is postulated to reinforce the structural integrity of eggshells under conditions when dietary calcium (Ca) is scarce. Within the context of this hypothesis, this thesis documents the use of Ca supplementation of two common British passerine species, blue (Cyanistes caeruleus) and great tits (Parus major), to explore the relationships between eggshell Ca and protoporphyrin content and visible pigment spotting. It further assesses the diversity of avian eggshell coloration using museum eggshells of 73 British passerine species. Despite low soil Ca availability, females were not necessarily Ca-limited but Ca-supplements may still influence eggshell traits and breeding behaviour, possibly by providing females with more time to invest in other activities. The importance of quantifying eggshell pigment concentrations directly, rather than using a proxy, is highlighted. Finally, this thesis shows that passerine eggshell pigment concentrations are highly phylogenetically conserved, thereby encouraging future studies testing key hypotheses to compare eggshell pigmentation of closely related species. This phylogenetic association may be essential to explain the functional significance of eggshell coloration of avian species.
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Hughes, R. J. "Influence of dietary electrolytes on blood acid-base balance in relation to formation of egg shells in the domestic hen." Title page, contents and summary only, 1989. http://web4.library.adelaide.edu.au/theses/09A/09ah894.pdf.

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Vonder, Haar Theresa Anne. "Engineering eggshells for carbon dioxide capture, hydrogen production, and as a collagen source." Connect to resource, 2007. http://hdl.handle.net/1811/25099.

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Thesis (Honors)--Ohio State University, 2007.
Title from first page of PDF file. Document formatted into pages: contains 37 p.; also includes graphics. Includes bibliographical references (p. 35-37). Available online via Ohio State University's Knowledge Bank.
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Tharapoom, Kampanat. "Causes and consequences of variations in eggshells in the lesser black-backed gull." Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/5346/.

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Variations in egg size and egg composition between females of the same species, as well as among eggs in the same clutch, have been studied in many avian species. The eggshell serves crucial functions in avian reproduction such as protection of the embryo from mechanical damage and from the invasion of micro-organisms, source of calcium to the embryo, control of gas exchange with the environment and conservation of water. But little attention has been paid to variation in eggshell, especially within-clutch variation. This thesis focuses on variations in eggshell characteristics in relation to laying order in a single species, the lesser black-backed gull (Larus fuscus). In order to evaluate a proper method for measurement of eggshell characteristics, this thesis used more than one technique to measure shell thickness, shell porosity and shell coloration. For the measurement of shell porosity, two techniques for counting pores were validated for the first time in this thesis. This study found within-clutch variations in shell porosity, mammillary layer contact area and shell coloration but not in shell thickness. The last-laid egg had a larger mammillary layer contact area and often had paler shell colour and streaks on the shell. This study found some relationships between shell structures and shell coloration. A calcium-supplementation experiment was used to investigate whether the shell formation is limited by calcium-availability. This thesis found effect of calcium-limitation on shell thickness, but no effect on shell background colour.
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Cavallerano, Edward J. "Temporal diagenetic alternations in Adélie penguin eggshells throughout the late holocene of Antarctica /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/cavalleranoe/edwardcavallerano.pdf.

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Bryan, Teresa A. "Morphological and constituent analyses of American alligator (Alligator mississippiensis) eggshells from contaminated and reference lakes." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010640.

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Henry, Stacey Blalock. "“Walking on eggshells”: a qualitative study on the effects of trauma and deployment in military couples." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/9157.

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Doctor of Philosophy
Department of Family Studies and Human Services
Briana S. Goff
The purpose of this qualitative study was to gain an in-depth understanding of the systemic effects of trauma, particularly war-related traumatic stress as a result of military deployments to Iraq and Afghanistan, in a sample of recent war veterans and their spouses. With recent military deployments and redeployments of soldiers, empirical and clinical research is needed to eliminate further deterioration and retraumatization caused by personal and interpersonal traumatization that can lead to severe PTSD and other trauma-related symptoms. Much of the research on previous wars focused on the individual trauma survivor overlooking the impact on the couple and family system. This study focused on explaining the systemic effects of trauma as it specifically impacts couple relational systems. By employing qualitative analysis, six couples (12 participants) were selected from the original data set of 45 couples (90 participants). Participants completed questionnaires and separate individual standardized open-ended interviews about their traumatic experiences. The interviews were transcribed, coded, and analyzed producing four themes: positive impact of deployment on the couple’s relationship, the negative impact of deployment on the couple’s relationship, soldiers’ war-related trauma, and issues of secrecy. Two groups were identified (high trauma/high relational satisfaction group and high trauma/low relational satisfaction group), based on the quantitative measures that were completed by all participants. Participants reported both war deployment related and non-deployment related traumatic experiences. Many participants reported feeling as though they restarted their relationship upon returning home, while some described feeling closer to their spouse at redeployment. Participants reported having a common worry of if the soldiers would return home alive, soldiers’ missing many life events (i.e., child birth, etc.), and soldiers’ worry about the safety and health of their spouses. An interesting finding was that some couples with high levels of trauma can maintain high levels of relational satisfaction when they have knowledge and understanding of each other’s trauma history and have open, on-going communication, while some couples with high levels of trauma tend to have low relational satisfaction due to limited communication about their trauma history. Strengths and limitations of the study, research implications, and clinical implications were discussed.
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Savage, Joy Phoenix M. "Ambient Void." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/art_design_theses/83.

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Tshizanga, Ngoya. "A study of biodiesel production from waste vegetable oil using eggshell ash as a heterogeneous catalyst." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2153.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology.
While biodiesel has the potential to resolve the energy crisis, its production is hampered by both feedstock and catalyst availability. The aim of this current study is to investigate the production of biodiesel from waste vegetable oil (WVO) as feedstock under heterogeneous catalysis, mediated by calcined eggshell ash. WVO, characterised by 9% free fatty acid (FFA) and 0.17wt% water content, was employed as feedstock in the biodiesel production via transesterification reaction. The composition of WVO was determined using Gas chromatography (GC) analysis. The eggshell was washed with distilled water to remove impurities, dried in an oven at 105°C, and then crushed into fine particle of 75μm, and finally, calcined in a muffle furnace at 800°C. The chemical properties of the catalyst were assessed as follows: 1) using X-ray diffraction (XRD) to determine the major component phase of the element; 2) using X-ray fluorescent (XRF) to determine the elemental composition of the eggshell ash; 3) using Brunauer Emmet Teller (BET) to define the structure, the surface area, pore volume and pore diameter of the eggshell ash; and 4) using SEM to show the morphology structure of the element. The XRD analysis performed on eggshell ash showed 86% CaO as a major component in the catalyst; the remaining 14% was composed of MgO, SiO2, SO3, P2O5, Na2O, Al2O3, K2O and Fe2O3, as obtained from XRF. The BET result of the catalyst prepared was characterised by large pore diameter (91.2 Å) and high surface area (30.7m2/g), allowing reactants to diffuse easily into the interior of the catalyst used
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Jelicic, Anna. "En hårdkokt historia : En studie av äggskalfynd från vikingatida gravkontext med särskilt fokus på Uppland och Gotland." Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324894.

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This thesis examines archaeological eggshell finds from cremation graves in the Swedish province of Uppland as well as inhumation graves from the island of Gotland. All graves are dated to the Viking Age, however, the chronology varies by the region, with the period´s ending placed around year 1050 AD in Uppland and around year 1150 AD at the island of Gotland. An attempt is made to create a list of all known cases of egg depositions in graves during the period of interest, and to subsequently analyse them all in order to get a better understanding of this practice. The comparative analysis of the artefact assemblages within the graves and grave constructions is undertaken in order to identify possible regularities in how and when the egg was used within the ritual sequence. Although notable regional variations and differences in Viking Age burial customs are known to exist between the two investigated regions, and artefacts deposited within the graves are adapted to regional conditions, it is possible, amongst other things, to observe similarities in the timing of egg deposition. By understanding the funeral as a rite of passage that signified the transition between the states of life and death, and with the final goal of achieving the distinction between the world of the living and the realm of deceased ancestors, it is possible to better comprehend the funeral rituals and their archaeological remains – in this case avian eggshells. By applying van Gennep's rites of passage tripartite structure, involving separation, liminality, and incorporation, it is concluded that eggs, as we see them in the archaeological material presented in this study, are used in the last stage of this model. This is the part of the process where the main goal is reintegration of those who participated in ritual into a new social order. It is thus proposed here that eggs might be seen as hierophanies:  profane, everyday objects that have manifested into something sacred and who are clearly understood as such to those involved in burial but not necessary to outsiders: as symbols for fertility, regeneration, rebirth and transformation.
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Books on the topic "Eggshells"

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Eggshells. Dublin: Liberties, 2015.

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Randi, Kreger, ed. Stop walking on eggshells. Oakland, CA: New Harbinger, 1998.

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Simmons, Herbert. Man walking on eggshells. New York: W.W. Norton, 1997.

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Mason, Paul T. Stop walking on eggshells. Oakland, CA: New Harbinger Publications, 1998.

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Mikhailov, Konstantin E. Avian eggshells: An atlas of scanning electron micrographs. Tring: British Ornithologists' Club, 1997.

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Eggshells & broken dreams: A memoir. Co Galway, Ireland: MacRuairi Art, 2010.

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Teaching is like-- peeling back eggshells. Mystic, CT: Twenty-Third Publications, 1994.

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Empty nests, broken eggshells: Selected poems. North Bay, Ont: Tomiko Publications, 1991.

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Solomon, Sally E. Egg and eggshell quality. London: Wolfe Pub., 1991.

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Aragón, Carla. Dance of the eggshells =: Baile de cascarones. Albuquerque: University of New Mexico Press, 2010.

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Book chapters on the topic "Eggshells"

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Lindsay, Wendy. "Treading on Eggshells." In Speaking Our Minds, 118–21. London: Macmillan Education UK, 1996. http://dx.doi.org/10.1007/978-1-349-25159-9_29.

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Maisel, Eric. "Walking on Eggshells." In Helping Survivors of Authoritarian Parents, Siblings, and Partners, 25–31. New York: Routledge, 2019.: Routledge, 2018. http://dx.doi.org/10.4324/9780429507717-4.

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Apps, Jennifer Niskala, and Dawn Pflugradt. "On Eggshells: Pediatric Bipolar Disorder." In Pediatric Neuropsychology Case Studies, 245–53. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-0-387-78965-1_24.

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Hamodrakas, Stavros J. "Molecular Architecture of Helicoidal Proteinaceous Eggshells." In Results and Problems in Cell Differentiation, 115–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47207-0_6.

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Rice-Ficht, Allison C. "Composition and Design of Fasciola hepatica Eggshells." In Results and Problems in Cell Differentiation, 75–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47207-0_4.

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Volik, Victor, and Dilaram Ismailova. "Isolation and Properties of Biogenic Calcium from Eggshells." In Fundamental and Applied Scientific Research in the Development of Agriculture in the Far East (AFE-2021), 1051–60. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91405-9_119.

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Koyama, T., and A. J. D. Tennyson. "Respiratory Pores on Ostrich Struthio camelus (Aves: Struthionidae) Eggshells." In Advances in Experimental Medicine and Biology, 51–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-38810-6_7.

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Aina, Samuel Tomi, Barend Jacobus Du Plessis, Vuyo Mjimba, and Hendrik Gideon Brink. "From Waste to Best Valorization and Upcycling of Chicken Eggshells." In Waste Management, 140–55. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9780429341106-8.

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Renita, A. Annam, V. Sivasubramanian, and P. Senthil Kumar. "Characterization and Optimization Studies on Hydroxyapatite Bioceramic Powder from Waste Eggshells." In Bioprocess Engineering for a Green Environment, 307–26. Boca Raton : Taylor & Francis, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/b22021-14.

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Mazzula, Silvia L., and Aileen Torres. "Latino Trends and Health Policy: From Walking on Eggshells to Commitment." In Enhancing Behavioral Health in Latino Populations, 75–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42533-7_5.

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Conference papers on the topic "Eggshells"

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Kudryashova, O. A., and O. Myshalova. "JUSTIFICATION OF THE NORMS FOR THE USE OF FOOD ADDITIVES FOR CHICKEN MEAT PRODUCTS." In I International Congress “The Latest Achievements of Medicine, Healthcare, and Health-Saving Technologies”. Kemerovo State University, 2023. http://dx.doi.org/10.21603/-i-ic-66.

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The research is aimed at studying the functional and technological properties of the meat of broiler chickens of the Ross-308 cross and substantiating the use of sodium pyrophosphate and mineral concentrate from eggshells in the production of poultry products. Data on changes in pH and water-binding capacity in the post-slaughter period were obtained. It has been established that the meat of broiler chickens of the Ross-308 cross is suitable for industrial processing after 5-6 hours of autolysis. In the manufacture of products, instead of phosphates, an eggshell mineral concentrate can be used.
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Ladouce, Mathieu, Tarek Barakat, Bao-Lian Su, Olivier Deparis, and Sébastien R. Mouchet. "UV scattering by pores in avian eggshells." In Light in Nature VIII, edited by Joseph A. Shaw, Katherine Creath, and Vasudevan Lakshminarayanan. SPIE, 2020. http://dx.doi.org/10.1117/12.2567915.

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Sembiring, Helmina Br, Nurhaida Pasaribu, and Josua Sitepu. "Calcium carbonate from chicken eggshells as adsorbents." In THE INTERNATIONAL CONFERENCE ON CHEMICAL SCIENCE AND TECHNOLOGY (ICCST – 2020): Chemical Science and Technology Innovation for a Better Future. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0046388.

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Meddeb, Aref. "Internet of Things Security: We're Walking on Eggshells!" In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2016. http://dx.doi.org/10.5339/qfarc.2016.ictop3170.

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Nipunika, Udakshi, Yashodhya Jayaneththi, and Galhenage A. Sewwandi. "Synthesis of Calcium Oxide Nanoparticles from Waste Eggshells." In 2022 Moratuwa Engineering Research Conference (MERCon). IEEE, 2022. http://dx.doi.org/10.1109/mercon55799.2022.9906264.

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Holmes, John, and Paul Kassel. "Can Ground Eggshells Be Used as a Liming Source?" In Proceedings of the 16th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2006. http://dx.doi.org/10.31274/icm-180809-866.

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Nuzulia, Nur Aisyah, Yessie Widya Sari, and Desi Riah Sari. "Synthesis of Duck Eggshells-based Fluorapatite by Using Microwave Irradiation." In 2018 1st International Conference on Bioinformatics, Biotechnology, and Biomedical Engineering (BioMIC). IEEE, 2018. http://dx.doi.org/10.1109/biomic.2018.8610626.

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Jamion, Nurul Ain, Maslina Adun, Siti Nor Atika Baharin, and Kavirajaa Pandian Sambasevam. "Removal of lead (Pb) in soil by eggshells activated carbon." In 4TH INTERNATIONAL SCIENCES, TECHNOLOGY AND ENGINEERING CONFERENCE (ISTEC) 2020: Exploring Materials for the Future. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0042889.

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Żołnowski, Wojciech, Anna Pakuła, Sławomir Paśko, Paweł Marć, Marek Życzkowski, and Leszek R. Jaroszewicz. "Multispectral portable optical fiber reflectometer for indirect detection of Mycoplasma synoviae poultry flock infection." In Optical Fiber Sensors. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/ofs.2022.th4.34.

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Previous measurements have shown that the changes in reflective properties of chicken eggshells allow the classification of their origin: healthy or Mycoplasma synoviae (M.S.) infected hens. The presented portable multispectral optical fiber reflectometer can be used for early M.S. detection in a flock by back-reflected light measurement using a multispectral system.
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Mardiana, L., B. Ardiansah, A. Septiarti, R. Bakri, and G. Kosamagi. "Ultrasound-assisted synthesis of curcumin analogs promoted by activated chicken eggshells." In INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2016 (ISCPMS 2016): Proceedings of the 2nd International Symposium on Current Progress in Mathematics and Sciences 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4991200.

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Reports on the topic "Eggshells"

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Holmes, John D., and David Rueber. Use of Ground Eggshells as a Liming Source. Ames: Iowa State University, Digital Repository, 2010. http://dx.doi.org/10.31274/farmprogressreports-180814-2176.

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Holmes, John D., and David Rueber. Use of Ground Eggshells as a Liming Source. Ames: Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/farmprogressreports-180814-2423.

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Holmes, John D., and David Rueber. Use of Ground Eggshells as a Lime Source. Ames: Iowa State University, Digital Repository, 2007. http://dx.doi.org/10.31274/farmprogressreports-180814-96.

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Kassel, Paul C. Report on the Effects of Eggshells and Aglime on Soil pH and Crop Yields. Ames: Iowa State University, Digital Repository, 2009. http://dx.doi.org/10.31274/farmprogressreports-180814-1173.

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Pines, Mark, Arieh Bar, David A. Carrino, Arnold I. Caplan, and James A. Dennis. Extracellular Matrix Molecules of the Eggshell as Related to Eggshell Quality. United States Department of Agriculture, 1997. http://dx.doi.org/10.32747/1997.7575270.bard.

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The extracellular matrix of the mineralizing eggshell contains molecules hypothesized to be regulators biomineralization. To study eggshell matrix molecules, a bank of monoclonal antibodies was generated that bound demineralized eggshell matrix or localized to oviduct epithelium. Immunofluorescence staining revealed several staining patterns for antibodies that recognized secretory cells: staining for a majority of columnar lining cells, staining for a minor sub-set of columnar lining cells, intensified staining within epithelial crypts, and staining of the entire tubular gland. Western blotting with the antibody Epi2 on eggshell matrix showed binding to molecules with the apparent molecular weight of eggshell matrix dermatan sulfate proteoglycan (eggshell DSPG) (Carrino, et al., 1997). Immunoblots of cyanogen bromide-cleaved eggshell DSPG revealed broad band of reactivity that shifted to 25 kDa after chondroitinase digestion; indicating that the Epi2 binding site is located on a fragment which contains dermatan sulfate side chains. Immunogold labeling showed that Epi2 binds to secretory vesicles within the non-ciliated cells of the columnar epithelium, while the antibodies Tg1 and Tg2 bind to secretory vesicles of tubular gland cells. Immunogold labeling of demineralized shell matrix showed binding of Epi2, Tg1, and Tg2 to the matrix of the palisades layer, and showed little reactivity to other regions of the shell matrix. Quantification of the immunogold particles within the eggshell matrix revealed that antibodies Epi2 and Tg1 bind all calcified regions equally while antibody Tg2 has a greater affinity for the baseplate region of the calcium reserve assembly.
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Oyen, Michelle L., and H. B. Caliskan. Engineering Tough Materials: Biomimetic Eggshell. Fort Belvoir, VA: Defense Technical Information Center, January 2015. http://dx.doi.org/10.21236/ada617297.

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Ficht, Allison R., J. H. Waite, Barbara L. Doughty, and W. M. Kemp. Synthesis of Stable Microcapsules from Trematode Eggshell Components. Fort Belvoir, VA: Defense Technical Information Center, June 1990. http://dx.doi.org/10.21236/ada224516.

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Kassel, Paul C. Effects of Eggshell and Ag Lime Applications on Soil pH and Crop Yields. Ames: Iowa State University, Digital Repository, 2005. http://dx.doi.org/10.31274/farmprogressreports-180814-1064.

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