To see the other types of publications on this topic, follow the link: Iron in the body.
Dissertations / Theses on the topic 'Iron in the body'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Iron in the body.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Requejo-Roque, Katherinne Isabel. "Iron oxide nanoparticles stable in the human body?" Revista de Química, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/101184.
Full textAbstract:
Actualmente, es posible obtener nanopartículas de óxido de hierro solubles en agua y establesen entornos biológicos por medio de la descomposición térmica a altas temperaturas y el intercambiode ligandos. Este método permite un control óptimo de la distribución de tamañopara obtener nanopartículas monodispersas y con superficie apta para funcionalizar, lo cuales fundamental en aplicaciones biológicas.Currently, it is possible to obtain iron oxide nanoparticles soluble in water with high stability in biological environments through thermal decomposition at high temperatures and ligand exchange. This method of synthesis allows good control of size distribution in order to obtain monodispersed nanoparticles with surfaces suitable for functionalization which is necessary for biological applications.
2
Shiono, Yuhta, Hisao Hayashi, Shinnya Wakusawa, Fujiko Sanae, Toshikuni Takikawa, Motoyoshi Yano, Kenntaro Yoshioka, and Hiros Saito. "Body iron stores and Iron restoration rate in Japanese patients with chronic Hepatitis C as measured during therapeutic Iron removal revealed neither Increased body iron stores nor effects of C282y and H63d mutations on iron indices." Nagoya University School of Medicine, 2001. http://hdl.handle.net/2237/5367.
Full text
3
Hotz, Karin. "Understanding the message of iron isotopes in the human body /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18376.
Full text
4
Prasad, Mona Kumar. "The effects of exercise and dietary iron on iron status in 13 months old female rats." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43274.
Full textAbstract:
The purpose of this study was to investigate the effects of exercise and dietary iron on various components of iron metabolism in 13 month old female rats. Fifty-six 13 month old female Sprague-Dawley rats were randomly assigned to one of five groups of treatment: baseline (BL); 40ppm iron, exercise (40 E); 9ppm iron, exercise (9 E); 40ppm iron, non- exercise (40 NE); 9ppm iron, non-exercise (9 NE). The exercise protocol involved swimming the exercise groups for a period of six weeks, starting with 10 minutes/day until the rats were swimming for 1 hour/day, 5 days/ week, at the sixth week. Results indicated no significant differences in food intake and body weight among the groups. Hematocrit values were similar among groups and did not show significant effects of diet, activity or interaction. Hemoglobin values demonstrated significant effects of activity with values being elevated in the exercise groups (p ≤0.05). No significant effects of diet and interaction on hemoglobin concentrations were observed. Serum iron levels were significantly affected by dietary intake of iron, with levels being lower in the groups consuming the moderately-deficient diet (p≤0.05). Serum iron levels were not significantly affected by activity or interaction of diet and activity. TIBC levels did not demonstrate significant effects of diet, activity or interaction (p<0.05). Tissue weights of liver, spleen, heart, soleus and gastrocnemius muscles were similar among groups. Iron concentrations in the liver and spleen showed significant effects of diet, activity and interaction (p≤0.05). Iron levels were lower in the groups consuming moderately-deficient intakes of dietary iron and were also lower in the exercised animals. Concentrations were significantly lower in the 9 E group than in the 40 E group. Iron concentrations in the gastrocnemius muscle were significantly affected by diet, activity and interaction of diet and activity, and were significantly lower in the exercised animals as compared to their sedentary counterparts. Soleus iron concentrations were similar among groups.
The results suggest that there is an iron cost associated with exercise as evidenced by elevated hemoglobin levels and depleted iron stores in the liver, spleen and gastrocnemius muscle. It appears that the body undergoes. physiological adaptions in response to the stress of exercise and therefore prevents anemia by maintaining the iron stores at compromised levels.Master of Science
5
Sinclair, Lisa M. "Effect of iron supplementation on endurance performance in iron deficient trained males and females /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422965.
Full text
6
Kind, Clive Nicholas. "Biochemical aspects of the fate of imferon (iron-dextran) in the body." Thesis, De Montfort University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280510.
Full text
7
Whitnall, Megan. "Iron metabolism, chelation and disease." Thesis, The University of Sydney, 2011. https://hdl.handle.net/2123/28914.
Full textAbstract:
Organisms depend on iron to survive. This fact is underscored by the critical requirement for iron during DNA synthesis and as a cofactor in proteins involved in respiration and oxygen transport. However, when present in excess of cellular requirements, iron can be toxic, due to its ability to generate reactive oxygen species and induce oxidative stress. The physiological significance of iron renders it a target for the development of iron chelators as therapeutic agents and highlights the potential problems that can occur when iron regulatory pathways are disturbed in disease.
The rapid rate of neoplastic cell replication and the involvement of iron in cell cycle progression and DNA synthesis, highlight the potential for using iron chelators for cancer treatment. Chapter 3 of this thesis demonstrates the broad-spectrum in vitro and in vivo anti-tumour activity of the novel iron chelator, di-2-pyridylketone-4,4,-dimethyl-3-thiosemicarbazone (Dp44mT) (Whitnall et.al., Proc Natl Acad Sci USA 2006; 103:14901-6). In vitro results illustrate the potency of Dp44mT over the clinically used chemotherapeutic agent, doxorubicin, and the ability of Dp44mT to overcome multidrug resistance. The unique ability of Dp44mT to up-regulate the tumour growth and metastasis suppressor, Ndrgl in in vivo experiments, may account for this ligands selective anti-tumour activity (Whitnall et al., 2006). Collectively, these studies demonstrate that iron chelators such as Dp44mT, may be valuable anti-cancer compounds, particularly considering the emergence of multi-drug resistance in tumours.
There is no effective treatment for the cardiomyopathy of the most common autosomal recessive ataxia, Friedreich 's ataxia (FA). The identification of potentially toxic mitochondrial iron deposits in FA suggests iron plays a role in its pathogenesis and merits the use of iron chelation therapy for the treatment of FA. Studies in Chapters 4 and 5 used the muscle creatine kinase (MCK) frataxin mutant mouse model that reproduces the classical traits associated with cardiomyopathy in FA, to study the molecular alterations which underlie the pathogenesis of this disease and assess the use of iron chelation therapy (Whitnall et.al., Proc Natl Acad Sci USA 2008; 105:9757-62). Studies specifically in Chapter 4 show that the increased mitochondrial iron in the myocardium of mutants was due to marked transferrin-iron uptake, which was the result of enhanced transferrin receptor 1 (TfRl) expression. 1n contrast to the mitochondrion, cytosolic ferritin expression and the proportion of cytosolic iron were decreased in mutant mice, indicating the cytosol was iron deficient. These studies demonstrate that loss of frataxin alters cardiac iron metabolism due to pronounced changes in iron trafficking away from the cytosol to the mitochondrion.
Further work in Chapter 4 showed that the mitochondrial-permeable ligand, pyridoxal isonicotinoyl hydrazone, in combination with the hydrophilic chelator, desferrioxamine, prevented cardiac iron loading and limited cardiac hypertrophy in mutants, but did not lead to overt cardiac iron depletion or toxicity (Whitnall et al., 2008). However, iron chelation did not prevent decreased succinate dehydrogenase expression in the mutants nor loss of cardiac function, indicating that frataxin function must also be replaced in addition to removing the excess mitochondrial iron. In summary, for the first time, studies in this thesis demonstrate that frataxin deficiency markedly alters cellular iron trafficking and that iron chelation limits myocardial hypertrophy in the MCK mutant model of FA.
To address the cytosolic iron deficiency in the cardiomyocytes of mutant mice, in Chapter 5, mice were fed a high iron diet aimed at reconstituting the iron deprived cytosolic compartment. From these studies, a significant decrease in cardiac hypertrophy was observed in high iron diet fed mice. Interestingly, while wild-type (WT) mice responded to the high iron diet by decreasing cardiac TfRl expression, no such compensation was observed in high-compared to normal-iron iron diet fed mutants. Similarly, activity of iron regulatory protein 2 (i.e., IRP2 RNA-binding activity) was not decreased in high iron diet fed mutants. These findings demonstrate the mutant heart does not respond to increased iron levels as does the WT animal. An intriguing and important outcome of dietary iron loading investigations, was the marked increase in iron concentration observed in the liver, spleen and kidney of mutant mice that were fed a normal iron diet. The MCK mutant mouse experiences deletion of frataxin in the heart only, and hence, the increase in iron levels observed in frataxin intact tissues such as the liver, indicated that the heart is able to influence systemic iron metabolism. Supporting this, changes were observed in iron-metabolism proteins such as hemojuvelin and TfRl not only in the heart, but in the liver. Collectively, these results indicate that frataxin knockout in the heart and the alterations in iron metabolism which lead to cytosolic iron deficiency in the heart, activate a systemic signalling mechanism, most likely to communicate its need for iron within the cytosolic compartment.
In the final section of Chapter 5, transmission electron microscopy and magnetic susceptibility measurements were used to assess the molecular composition of accumulated iron in the MCK mutants. These studies showed that the iron accumulating in the mutant heart is not present within ferritin, but in well crystallised antiferromagnetic mineral aggregates.
In conclusion, the investigations described within this thesis demonstrate the potential for iron chelators to be used for the treatment of cancer and FA. Moreover, they also begin to elucidate the marked alterations in the pathways of iron metabolism that occur on both a cellular and systemic level in FA. ln terms of contributing to our understanding of basic physiological iron homeostasis, they also identify that cardiac iron status is able to markedly influence systemic iron metabolism.
8
Nikolaiczuk, Marcia Jane. "Relative availability of iron to rats from beef, soy protein and a beef-soy protein mixture as determined by iron repletion assay." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24874.
Full textAbstract:
Male weanling Wistar rats were fed a low-iron basal diet for 3 weeks. The iron depleted rats were then divided into 9 groups according to a randomized block design based on body weight. During the repletion period of 2 weeks, one group was fed the low-iron basal diet. The other eight groups received either the basal diet to which was added 5, 10, 15, 20 or 25 mg iron per kg diet as ferrous sulfate or test source diets formulated to provide a total of 15 mg iron per kg diet from either freeze-dried ground beef, textured defatted soy flour product or a 2.3:1 (w/w) mixture of beef and soy product. All diets were isocaloric and isonitrogenous. The relative biological value (RBV) of iron in the test source diet was calculated as the ratio of the amounts of iron from the reference source (ferrous sulfate) and the test source diet required to give the same response in hemoglobin or hematocrit. The RBVs ± 95% confidence limits, calculated on the basis of final hemoglobin levels and hematocrit values, were respectively: freeze-dried ground beef, 56 ± 7 % and 62 ± 7 %; fortified textured defatted soy flour product, 81 ± 10 % and 79 ± 10 %; 2.3:1 (w/w) mixture of freeze-dried ground beef and soy flour product, 65 ± 6 % and 68 ± 6 %. The RBVs obtained for the iron in beef and for that in the soy flour product suggest that the anemic rat might not be a suitable model for normal man when screening such foods for their available iron. In normal man, the absorption of the iron in beef is comparable to that of inorganic reference iron, while that in textured soy flour is about one third.Land and Food Systems, Faculty of
Graduate
9
Mascarenhas, Monica Sousa Dias. "Role of Hfe and hepcidin in the homeostasis of body iron levels." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1444809/.
Full textAbstract:
Recent studies have suggested that hepatic iron stores and the response to anaemia and inflammation are dependent on the mouse strains used and their Hfe status. Hepcidin and iron transporters such as DMT1 and Iregl are regulator molecules important in the pathology and physiology of Iron metabolism. The aim of these studies was to produce Hfe KO mice on a strain known to have higher basal hepatic iron levels and study iron homeostasis in relation to variable dietary iron and inflammation in these mice. The regulation of hepcidin was investigated in Huh7 cells exposed to various stimuli such as iron, inflammation and hypoxia. In addition, Huh7 cells were exposed to conditioned medium obtained from HH1 patient's macrophages. Results obtained from these studies are described and discussed in this thesis. In brief, it was found that the disruption of the Hfe gene causes a preferential accumulation of iron in the caudate lobe of the mouse liver. Contrary to previous findings, iron loaded diet does not have an effect on hepcidin expression in wt SWR mice while in Hfe KO SWR mice it significantly upregulates hepcidin expression. Furthermore, the upregulation of hepcidin by turpentine oil-induced inflammation in SWR mice is Hfe-dependent. Hepcidin expression is down regulated by hypoxia and anaemia and conditioned medium from patients with HH1 macrophages have no effect on hepcidin expression levels. In conclusion, the results show that SWR Hfe KO mice is not an accurate model for the study of HH1, the studies described here, however, contribute to the understanding of how hepatocytes respond to iron status, hypoxia and inflammation and the relevance of the Hfe gene in the regulation of hepcidin expression levels as well as hepatic DMT1 and Iregl expression levels.
10
Snape, Susan Dawn. "Studies on the mechanism of intestinal iron absorption with special reference to its intracellular transport." Thesis, Open University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254664.
Full text
11
Sawchuck, Lynne Lorraine. "The effect of running on the iron requirement of females." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25149.
Full textAbstract:
To determine whether running imposes an additional iron cost on the female athlete, the response to an identical iron supplementation regime (200 mg elemental iron/day for 12-13.5 weeks) was assessed in two groups of iron deficient females classified as either runners (n=11) or non-runners (n=11). Criteria for selection was iron deficiency (serum ferritin ≤ 20 ng/ml) with an absence of anaemia (haemoglobin ≥12 g/dl). The response to therapy was evaluated on the basis of changes in serum ferritin and haemoglobin levels. Dietary intakes, physical activity and menstruation were monitored by all subjects. Runners averaged 32±8 miles running/week while the non-runners remained relatively sedentary during the supplementation period. Menstrual losses were similar in both groups. There was no significant difference in absorbable iron intake between the groups (p=0.10) and intakes ranged from 0.4-2.6 mg absorbable iron /day. Inadequate iron intakes were clearly demonstrated in 62% of the dietary records. As expected, there was a significant improvement in iron status over the period of oral iron therapy. Although the average overall change in serum ferritin for non-runners was 37.1 ng/ml compared to 26.6 ng/ml for the runners, this was not statistically significant (p=0.29) due to the very large interindividual variability in the change scores. Similarly, there was no significant difference in haemoglobin between the groups when averaged over time (p=0.81) and runners and non-runners demonstrated a similar pattern of change in haemoglobin over the course of supplementation. Regardless of their athletic practices, all females in their reproductive years appear to be at high risk of iron deficiency, primarily due to inadequate nutrition. Regular blood donation was also recognized as a potential contributing factor to the observed iron deficiency in these females, particularly in the non-runners. Because iron deficiency is undesirable for optimal health and well-being, recognition and prevention is highly recommended. Regular monitoring of iron status is particularly important in high performance athletes since a minor deficiency can potentially hinder peak performance and/or lead to the development of anaemia.Education, Faculty of
Curriculum and Pedagogy (EDCP), Department of
Graduate
12
Stuart, Katherine Anne. "Iron overload in end-stage liver disease : mechanisms and pathophysiological significance /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18503.pdf.
Full text
13
Bloem, Liezl. "Iron and multiple sclerosis." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/340.
Full text
14
Frazer, David Michael. "The molecular basis of intestinal iron absorption and its regulation /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17396.pdf.
Full text
15
Jones, Eleanor Katherine. "Out of the iron house : deconstructing gender and sexuality in Mozambican literature." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/out-of-the-iron-house-deconstructing-gender-and-sexuality-in-mozambican-literature(3c2de69d-c356-4fb5-bd2f-a0432ba38174).html.
Full textAbstract:
This thesis explores the roles of gender, sexuality, and the body in the works of six Mozambican authors: poets José Craveirinha (1922-2003) and Noémia de Sousa (1926-2002), and prose fiction writers Lília Momplé (1935-), Paulina Chiziane (1955-), Ungulani Ba Ka Khosa (1955-), and Suleiman Cassamo (1962-). Building primarily on the critical precedents set by Hilary Owen, Phillip Rothwell, and Ana Margarida Martins, the study aims to make an original contribution to the field of Mozambican cultural studies by proposing that the gendered body has a unique capacity for reappropriation as a means of resistance to oppressive power mechanisms, thanks to its consistently central position in Portuguese imperial and Mozambican postindependence discourses of nationhood. In addition, the thesis seeks to illustrate the value of intergenerational, inter-gendered, and inter-aesthetic author comparison, and an eclectic ‘toolbox’ approach to critical theory, for the production of innovative new perspectives on Mozambican literary output. Following the contextual scene-setting laid out in the Introduction, Chapter 1 explores constructs of masculinity in a selection of poems from José Craveirinha’s first published collection, Xigubo (1964), and compares them with Paulina Chiziane’s third novel O Sétimo Juramento (2000), using Judith Butler’s theories of compulsory heterosexuality and gender subversion (1990 and 1993). While Craveirinha’s work is posited as a counternarrative to Portuguese imperial emasculation of the black male subject that ultimately reproduces colonial gender structures, Chiziane’s novel is shown to engage with strategies of parody and realism in order to challenge such reproductions. Chapter 2 makes use of the concept of ‘disidentification,’ developed in the late twentieth century by U.S. feminists and queer theorists of colour, to compare selected poems from Noémia de Sousa’s Sangue Negro (1948-51) with prose fiction by Ungulani Ba Ka Khosa (1987 and 1990). Despite the authors’ aesthetic dissimilarities, their work is shown to share a successful commitment to the rejection of imposed femininities. Whereas de Sousa articulates this refusal via a ludic use of language, Khosa roots his narratives of disidentification in grotesque gendered corporealities. Chapter 3 compares novellas and short stories by Lília Momplé (1988, 1995, and 1997) and Suleiman Cassamo (1989 and 2000), examining the authors’ uses of the (dis)embodied states of suicidality, hunger, and ghostliness. Making use of Achille Mbembe’s (2001 and 2003) postcolonial reworkings of Michel Foucault’s concept of biopolitics (1976), this final chapter seeks to understand the ways in which the authors exploit imperial and postindependence instrumentalisations of the Mozambican body as a means of reasserting subjectivity and selfhood in the face of massification. Throughout the study, emphasis is placed on the often concealed and latent nature of gendered resistance, which remains a persistent feature of Mozambican literary output despite the relative intransigence of sexual politics in the country. By centring the body in their aesthetically diverse works, writers from Mozambique demonstrate the value of gendered resistance not only as an end in itself, but also as a means of accessing wider subversive discourses and gestures.
16
Tolkien, Zoe Ann Julia. "Dietary iron intake and quality of life in patients with inflammatory bowel disease." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648644.
Full text
17
Newcomer, Lisa. "Dietary intake and iron deficiency in college age female distance runners." Virtual Press, 1988. http://liblink.bsu.edu/uhtbin/catkey/539799.
Full textAbstract:
The purpose of this study was to determine whether adherance to a modified vegetarian diet predisposed young female athletes to iron deficiency. Two groups of female distance runners volunteered to be subjects for this study. One group consisted of women who regularly consumed red meat, and the other groups women who consumed a modified vegetarian diet. Three day dietary records analyzed to estimate nutrient intake, including available iron. Measures of serum ferritin, serum iron, total iron binding capacity, percent transferrin saturation, hemoglobin and hematocrit were done to asses iron status. The two groups did not differ in the amount of total iron or available iron in their diets. The red meat eating subjects consumed significantly more heme iron from their diets than the modified vegetarians; however there were no differences between the two groups in any of the measures of hematological or iron status. While there were no differences between the two groups in the percent of subjects classified in each stage, 37% of all of the subjects were classified as having a stage 1 deficiency, associated with iron deficient stores, and 11% of the subjects were classified as having a stage 2 deficiency, indicating iron deficient erythropoiesis. None of the subjects were anemic. The results indicate that adherance to a modifed vegetarian diet in this age group did not increase the risk of iron deficiency.School of Physical Education
18
Human, Veronique. "Molecular analysis of genes involved in iron overload implicated in oesophageal cancer." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/391.
Full text
19
Hensley, Starla Sue. "The assessment of the relationships between body image, dietary intake, iron status, percent body fat and menstrual status of female competitive iceskaters, ages 11-16." Virtual Press, 1990. http://liblink.bsu.edu/uhtbin/catkey/722444.
Full textAbstract:
Competitive ice skating is a sport in which thinness is stressed and is expected of these athletes. This obsession with thinness leads to decreases in body weight, psychological effects, and eating disorders. This study sought to investigate whether there was a relationship between body image, dietary intake, iron status, percent body fat, and menstrual dysfunction in 11 to 16 year old female ice skating competitors in the United States. Little research has been conducted with ice skaters in the area of body image. However, ice skaters, ballet dancers, and many other athletic groups are involved in an area of our culture in which a lean body image is encouraged.The experimentally accessible population for this study included those U.S. competitive ice skaters attending the Sports Medicine and Science Testing Program at the Indiana World Skating Academy. The target population included females ages 11 to 16.Statistical analysis of the data revealed:(1) A significant relationship between thiamin, calcium, and riboflavin intake and eating attitude test score (body image) in female ice skaters, ages 11-16.(2) A significant relationship between menstrual dysfunction and the weights of female ice skaters, ages 11 to 16.When dietary records were evaluated, the mean caloric intake of the skaters was low at 1781 calories. Caloric intakes were 445 calories less than estimated necessary to support normal growth (Benson et al, 1985). None of the vitamin levels fell below 96% of the Recommended Dietary Allowances (RDA), however, minerals which were less than 75% of the RDA included calcium, iron, magnesium, zinc and potassium. There were more than 14 participants who consumed greater than 100% of the RDA for vitamin C, vitamin E, folacin, vitamin B-12, niacin, riboflavin and thiamin.Of the 19 participants who participated in hematological assessment, four were found to have an impaired iron status. The contributor to this low iron state may have been poor dietary iron consumption, as 10 of the 20 skaters consumed less than 67% of the RDA for iron.The participants' body image, measured by the Eating Attitude Test (EAT), revealed that two participants had scores greater than 30, indicative of eating disorders.The participant's age may have played a role in the tendency towards an eating disorder, for when age was correlated with EAT scores, a positive relationship existed, indicating that as age increased, the tendency towards an eating disorder increased.Training has posed enormous changes on the body composition of these female ice skaters. Ranges of 21.5% to 25.4% body fat are expected for the age group of 11 to 16. However, 71% of the ice skaters had a body fat less than 22%, and 38% of the skaters had a body fat less than 17%.This study identified numerous menstrual dysfunctions in among the participants as 9 of the 21 participants had irregular menses, and 4 have never menstruated and their ages were 15, 14, 13 and 11. The weights of these ice skaters may have a role in the menstrual dysfunctions, as a significant relationship was found between menstrual dysfunctions and the weights of these skaters. Those participants who had never menstruated, had four of the five lowest weights at 72 lbs, 90 lbs, 95 lbs, and 103 lbs. Those participants who had irregular menses, had weights below 117 lbs.The data indicated the main concerns about the diets of subjects in this study were the low caloric, calcium, and iron intakes. Ice skaters need to be aware of the benefits of a "normal caloric" intake, which can provide adequate amounts of calcium and iron in the diet. In addition, an adequate caloric intake could increase body weights of the ice skaters, and help alleviate amenorrhea and associated health complications.Department of Home Economics
20
Ljuboja, Joka. "Calcium and iron intake between college aged female dancers and non-dancers." Virtual Press, 1994. http://liblink.bsu.edu/uhtbin/catkey/902463.
Full textAbstract:
The objective of this study was to investigate if there was a difference in the dietary intake of calcium and iron between female college aged dancers and non-dancers. Three day food records of 18 dancers and 21 non-dancers were analyzed for calcium and iron using Nutritionist IV computer software. Though not statistically significant dancers had a higher intake of calcium than non-dancers (864.7 mg/d vs. 796.2 mg/d) The main sources of calcium for both groups was milk followed by cheese. Mean daily intake of iron for dancers and non-dancers was 16.9 mg/d and 16.5 mg/d respectively. Grains were the main source of iron for both groups. A participants survey was used to collect descriptive data such as height, weight, smoking status, hours spent exercising , use of multivitamin supplements and nutrition course attended. Five dancers and four non-dancers took multivitamin plus mineral supplements. Reasons for use of supplements were: perceived notion that supplements provided energy and participants thought their diet was inadequate. The dietary habits of 38 % of the non-dancers who had previously had a nutrition course was not positively influenced by nutrition education.Department of Home Economics
21
Poole, Graeme. "Molybdenum and platinum isotope anomalies in iron meteorites : constraints on solar nebula heterogeneities and parent body processes." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/60083.
Full textAbstract:
Recent investigations revealed systematic nucleosynthetic Mo isotope anomalies in meteorites, affording clear evidence for variable excesses in p- and r process nuclides, and hence deficits in s process nuclides. These anomalies were interpreted as reflecting selective destruction/removal of unstable presolar components, within the framework of thermal processing models that also take into account data for other elements (e.g., Ru, Zr, Os). To test such models, this study has undertaken extensive measurements of Mo and Pt isotopes in iron meteorites, providing the most precise data for the broadest range of samples analysed to date. The data presented here are in agreement with previous studies, with all groups analysed (except the IAB/IIICD complex) displaying deficits in s process Mo nuclides, with the extent varying between groups. This unique dataset allows, for the first time, resolution of decoupled p process and r process isotope effects, providing the basis for an updated thermal processing model. Mass-independent Pt isotope anomalies were also observed, but these are interpreted as entirely cosmogenic in origin, resulting from exposure of the meteoroids to galactic cosmic rays. No nucleosynthetic Pt isotope anomalies are resolvable, in accord with predictions from the updated thermal processing model. Systematic variations in the stable isotope compositions of Mo (δ98Mo) and Pt (δ198Pt) within iron meteorite groups were found, reflecting internal processes within the parent bodies. In detail, these result from isotope fractionation during metal–sulphide partitioning of Mo, and solid–liquid metal partitioning of Pt, respectively. Significantly, a previously undetected correlation between the magnitude of the nucleosynthetic Mo isotope anomalies and δ98Mo values of iron meteorite parent bodies provides novel support for the thermal processing model. However, no signatures of elemental processing in the solar nebula are resolvable in δ198Pt, as any such effects were overprinted by the isotopic fractionation that accompanied partitioning of Pt between solid and liquid metal.
22
Mihai, Georgeta. "Methods for brain iron evaluation in normal aging T2 and phase measurements at 3 tesla and 7 tesla /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1189791295.
Full text
23
Karava, Nilesh B. "The Effect of Heating Chicken Muscle on Formation of Bioavailable Froms of Iron." Connect to this title, 2008. https://scholarworks.umass.edu/theses/112.
Full textAbstract:
Muscle foods/meat enhances bioavailability of non-heme iron form the diet. This effect is generally thought to be due to production of peptides, by gastro-intestinal digestion, which reduces/chelate the iron in upper intestine. Dialyzable iron is widely used as an in-vitro indicator of iron bioavailability, and with few exceptions, correlates well with human studies. Human studies have used cooked meat to test the effect on iron, but little attention has been given to the effects of cooking. We studied the effect of heating chicken muscle on the production of dialyzable iron. Chicken breast muscle was homogenized and heated to the temperatures in the range of 130-195oF. The concentration of amino acid binding residues was determined in the heated samples. The samples were then mixed with ferric iron and digested with pepsin and pancreatin. Heating chicken muscle caused a large drop in sulfhydryl (-SH) content and a lesser but significant loss in histidine content, both of which increased progressively with temperature. At 165oF, considered a safe cooking temperature, the loss in –SH and histidine was 75% and 37%, respectively. Changes in dialyzable iron and dialyzable ferrous iron (often considered the best indicator of bioavailability) paralleled the drop in amino acid. Raw uncooked chicken muscle produced about 11 times as much dialyzable iron and 17 times as much dialyzable iron as the control but heating to 165oF reduced the values by 47% and 74% respectively. Heating to 195oF reduced caused a further drop in dialyzable iron values. Our result showed that cooking chicken muscle caused a large decrease in the production of dialyzable iron forms-especially in the ferrous form- and this is correlated with the loss in critical iron binding amino acids.
24
Luscieti, Sara. "The Iron Regulatory Protein/Iron Responsive Element (IRP/IRE) system: functional studies of new target mRNAs and pathological implications for novel IRE mutations." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/399593.
Full textAbstract:
Iron is an essential micronutrient required for many cellular reactions and a tight regulation of its metabolism is therefore crucial for health. Cellular iron homeostasis relies on the coordination of iron uptake, storage and mobilization. These processes are controlled post-transcriptionally by the IRP/IRE regulatory system. The Iron Regulatory Proteins (IRP1 and IRP2) can recognize cis- regulatory mRNA motifs termed IREs (Iron Responsive Elements), conserved RNA elements located in the untranslated regions (UTR) of mRNAs that encode for proteins involved in iron metabolism. IRP/IRE interactions regulate the expression of mRNAs encoding for proteins for iron acquisition, storage, utilization and export in response to cellular iron level itself being the interaction of the IRPs with IRE motifs promoted under iron-deficient conditions and abolished in iron-replete conditions. Depending on the location of the IRE, IRPs binding regulates gene expression differentially: IRPs inhibit translation initiation when bound to IREs at the 5’ UTR, while IRPs association with 3’ IREs stabilizes and protects the mRNA from degradation.
The lack of control of expression of IRE-containing mRNAs is associated in humans with pathological conditions showing the importance of components of the IRP/IRE regulatory system. In the last decades, significant progress has been made in the iron metabolism field, however, post-transcriptional regulation of gene expression by the IRP/IRE regulatory system has been limited to a small subset of known genes. A genome-wide study carried out by our group to characterize the whole repertoire of mRNAs that can interact with the IRPs, identified 35 novel IRP1 and IRP2 candidate target-genes.
This work focused on the validation and functional characterization of one of this candidates: Profilin2 (Pfn2). Pfn2 is an actin-binding protein involved in the control of cytoskeletal dynamics. We identified a conserved IRE in the 3’ UTR of Pfn2 mRNA which is functional in in vitro binding studies with IRP1 and IRP2.
Pfn2 mRNA showed preferentially downregulation under iron-excess condition in cell lines and we demonstrated to be regulated by IRPs-mediated stabilization in vivo, since Pfn2 mRNA levels are reduced in a mouse model with Irp1 and Irp2 gene inactivation.
Moreover, the reduction of cellular free iron levels by Pfn2 overexpression experiments in cell lines, as well as, the misregulation of iron distribution observed in mice knockout for Pfn2 gene, revealed Pfn2 as a previously unrecognized player in iron metabolism.
In addition, we also contributed to the identification of a functional 3’ IRE in human BDH2 mRNA, a protein involved in lipocalin-siderophores iron-trafficking, as well as, in the identification and characterization of two novel L-ferritin IRE mutations (Heidelberg +52G>C and Badalona+36C>U) causative of Hereditary Hyperferritinemia Cataract Syndrome and a novel mutation in ALAS2 IRE demonstrated to be a modifier of clinical severity in a family with Erythropoietic Protoporphyria.El hierro es un micronutriente esencial requerido por múltiples reacciones celulares y una regulación adecuada de su metabolismo es fundamental para la salud. La homeostasis celular del hierro está basada en la coordinación de la absorción, el almacenamiento y la movilización de este elemento. Estos procesos son controlados post-transcripcionalmente por el sistema IRP/IRE. Las proteínas reguladoras del hierro (IRP1 e IRP2) reconocen un motivo estructural presente en el ARNm de algunos genes denominado IRE (Iron Responsive Element). El IRE es un motivo conservado y situado en las regiones no traducidas (UTR) de los ARNm de proteínas implicadas en el metabolismo del hierro. Las interacciones IRP/IRE regulan la expresión de los ARNm que codifican proteínas para la adquisición, el almacenamiento, la utilización y la exportación de hierro en respuesta a los niveles celulares de hierro, porque la interacción de las IRPs con los motivos IRE se ve incrementada a niveles bajos de hierro y disminuida en condiciones altas de hierro. Según la localización de los IRE, las IRPs regulan de manera distinta la expresión de sus dianas: las IRPs inhiben la iniciación de la traducción cuando se unen a IREs situados en el 5' UTR, mientras que su asociación con los IREs del 3' UTR estabiliza y protege dicho ARNm de la degradación. La falta de coordinación de la expresión de genes que contienen IRE está asociada con condiciones patológicas ilustrando la importancia de los componentes del sistema regulador IRP/IRE. En las últimas décadas se han realizado progresos importantes en el campo del metabolismo del hierro. Sin embargo, la regulación post-transcripcional de la expresión génica por el sistema IRP/IRE se ha limitado a un pequeño subconjunto de genes. Un estudio “genome-wide” llevado a cabo en nuestro grupo para la caracterización global del sistema regulador IRP/IRE dio como resultado la identificación de 35 genes diana que se unen a IRP1 e IRP2. La presente tesis tiene como objetivo general validar y caracterizar funcionalmente una de esas dianas: Profilin2 (Pfn2). Pfn2 es una proteína que une actina y que está involucrada en la regulación de la dinámica del citoesqueleto. Hemos identificado un IRE localizado en el 3’ UTR del ARNm de Pfn2; el IRE es funcional en estudios in vitro para la unión a IRP1 e IRP2. El ARNm de Pfn2 viene preferentemente regulado y reducido en condiciones altas de hierro en líneas celulares y hemos demostrado in vivo que es regulado por estabilización mediada de las IRPs, ya que los niveles de ARNm de Pfn2 se encuentran reducidos en ratones a los que los genes de Irp1 y Irp2 han sido inactivados. Así mismo, la sobrexpresión de Pfn2 en líneas celulares asociada a una reducción en los niveles de hierro libre, así como la desregulación de la distribución del hierro encontrada en ratones “knockout” para el gen de Pfn2; convierten a Pfn2 como un actor nuevo en el metabolismo del hierro. Por otro lado hemos contribuido tanto a la identificación de un 3’ IRE funcional en el ARNm humano de BDH2, una proteína involucrada en el tráfico de hierro a través del sistema de lipocalinas-sideróforos, como a la identificación de dos nuevas mutaciones en el IRE de la Ferritina L (Heidelberg +52G>C y Badalona+36C>U) responsables del Síndrome Hereditario de Hiperferritinemia con Cataratas y también a la identificación de una nueva mutación en el IRE de ALAS2 que ha demostrado ser un modificador de la importancia clínica de los síntomas en una familia con Protoporfiria Eritropoyética.
25
Tsamis, Vasileios. "Body, senses and space in late Broze Age - early Iron Age central Macedonia, Greece : Kastanas, Assiros and Toumba Thessalonikis." Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495814.
Full text
26
Peñuela, Norma. "The relationship between dietary intake and blood lead levels among WIC infants in rural West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=2897.
Full textAbstract:
Thesis (M.S.)--West Virginia University, 2003.Title from document title page. Document formatted into pages; contains vii, 56 p. Vita. Includes abstract. Includes bibliographical references (p. 41-45).
27
Botha, Pieter W. S. K. "The mineralogy and geochemistry of the Rooikoppies iron-rich ultramafic pegmatite body, Karee Mine, Bushveld Complex, South Africa [electronic resource] /." Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01272009-172307/.
Full text
28
Garman, Lucy S. "Iron status and behavioral factors relative to dietary source of protein intake among female athletes at Virginia Tech." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12232009-020501/.
Full text
29
Koorts, Alida Maria. "Expression of the H-subunit and L-subunit of ferritin in bone marrow macrophages and cells of the erythron during chronic immune stimulation." Thesis, Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-03122010-195432/.
Full text
30
Carr, G. "Romanization and the body : changing identities in the Later Iron Age and Early Roman period in the territory of the Trinovantes and Catuvellauni." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597307.
Full textAbstract:
In this thesis I examine and follow the change in identity of two neighbouring but rival Iron Age tribal groups, the anti-Roman Trinovantes of Essex and the pro-Roman Catuvellauni of Hertfordshire, as they underwent 'Romanization' and entered the early Roman period. I suggest that the change in tribal and personal identity was reflected in changing attitudes to the human body and, thus, personal appearance. I also examine whether the archaeological record backs up to the traditionally accepted political stance of these people. This stance is suggested by the tribal history, which was written on the basis of numismatic evidence coupled with the classical texts. I argue that what has previously been termed 'Romanization' can be better understood as a process whereby groups of people from different areas made different cultural choices from the same repertoire of material culture to structure their ethnic identities, whether tribal, local, or individual. Sometimes this choice of artefacts was deliberately in opposition to their neighbours and rivals. In cases where the choice of identity was deliberately native well into the Roman period, I have asked whether this was due to what I term 'covert but active' resistance, a form of silent rebellion against the Romans. Alternatively, it may have been due to a retention of identity for its own sake because tribal identity was still an important concept to the indigenous population after the Conquest. I conclude by arguing that each group of people would have understood these artefacts in different ways, imbued them with different meanings according to who they were and what identities they wanted to express, and incorporated them into pre-existing native social practices. As these practices would have had their roots in the later Iron Age, I conclude that there was no 'Romanization of the body' as such. People did not necessarily use these artefacts to 'become Roman'; their use did not represent any radically new lifestyle.
31
Van, Wyk Mari. "The investigation of iron and mineral deficiency associated with the practice of geophagia." Thesis, Bloemfontein : Central University of Technology, Free State, 2014. http://hdl.handle.net/11462/207.
Full textAbstract:
Thesis (M. Tech. (Biomedical Technology)) -- Central University of technology, Free State, [2013]Introduction: Geophagia, a subcategory of pica, is the practice of persistently and deliberately eating earthy or soil like substances. A definite cause for the practice of geophagia is yet to be established, but some theories claim that the soil holds nutritional value to the geophagist. Method: Geophagic woman in the QwaQwa area between the ages of 18 and 45 years were identified by means of a questionnaire. A test group, consisting of 48 women in the habit of consuming soil, and a control group, consisting of 35 non geophagous women, were identified. Subjects in the control group were chosen from the same household or in the same area as the test subjects. On each subject, of both the test group and the control group, the following tests were done: total serum iron, transferrin, ferritin, calcium, magnesium, phosphate and albumin. The results obtained were statistically analysed and compared. Biochemical results were compared with haematology results obtained by another researcher, using the same test group and control group subjects. Results: In the test group, 75% of the individuals had results indicative of iron deficiency, compared to only 26% in the control group. The haematology results also indicate anaemia in the test group, most probably brought on by iron deficiency. There was no significant difference in mineral results between the test- and control group. Thus no association could be established between soil consumption and mineral status. Conclusion: In relation to non-geophagous women, people who consume soil have a tendency toward iron deficiency. It is impossible to ascertain whether the iron deficiency caused the craving for soil, or whether the consumption of soil caused the iron deficiency. No definite association could be made between soil consumption and mineral status.
32
Felkar, Victoria. "The iron bar. Episodes in the modern history of prison physical culture, body typing and the ban on weight lifting in American correctional institutions." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51789.
Full textAbstract:
The aim of this study is to explore the modern history of prison physical culture in order to better understand how perceptions of the muscular criminal male body have influenced the construction of prison physical culture and opportunities for physical activity in American correctional institutions. My focus on the recent weight lifting ban in the United States is designed to appraise how criminological knowledge of the muscular criminal male body has influenced penal policy over time. Through a selection of specific historical episodes in prison physical culture from the late 18th century to current correctional practice I evaluate the complicated interplay between penology, criminology, somatotyping, politics, prison physical culture and the enactment of the legal ban on prison weight lifting in 1994.
Working from a critical socio-historical perspective this study intends to add to the limited knowledge of prison physical culture, research on physical activity in correctional facilities and attitudes toward the corporeal experience of those confined to prison. My study has been guided by the following research questions: 1) how have historical perceptions of the muscular criminal body developed, and in turn, influenced penal policy over time? In particular, what have been the influences of body profiling and somatotyping on the role of inmate’s weight lifting in prisons?; 2) in light of this, how can we better understand the reasoning behind the enactment of the 1994 weight lifting ban placed on prison physical culture within the United States?; 3) what have been the effects of the weight lifting ban on contemporary prison physical culture?
This study is an interdisciplinary project which utilizes qualitative methodologies in the collection and analysis of documents and resources from kinesiology, criminology, anthropometry, and penology. Critical discourse analysis framed by Gee (1999, 2006) and Foucauldian perspectives on discipline, punishment and power provide the framework for my analysis of prison physical culture over time and place.Education, Faculty of
Kinesiology, School of
Graduate
33
Schmiedt, Jacob. "Interplay of magnetic, orthorhombic, and superconducting phase transitions in iron-based superconductors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-154434.
Full textAbstract:
The physics of iron pnictides has been the subject of intense research for half a decade since the discovery of superconductivity in doped LaFeAsO in 2008. By now there exists a large number of different materials that are summarized under the term "pnictides'' with significant differences in their crystal structure, electronic properties, and their phase diagrams. This thesis is concerned with the investigation of the various phase transitions that are observed in the underdoped compounds of the pnictide subgroups RFeAsO, where R is a rare-earth element, and AFe_2As_2, where A is an alkaline-earth element. These compounds display two closely bound transitions from a tetragonal to an orthorhombic phase and from a paramagnetic to an antiferromagnetic metal. Both symmetry-broken phases are suppressed by doping or pressure and close to their disappearance superconductivity sets in. The superconducting state is stabilized until some optimal doping or pressure is reached and gets suppressed thereafter. The central goal of this thesis is to improve our understanding of the interplay between these three phases and to describe the various phase transitions. We start from an itinerant picture that explains the magnetism as a result of an excitonic instability and show how the other phases can be included into this picture. This approach is based on the the observation that the compounds we are interested in have a Fermi surface with multiple nested electron and hole pockets and that they have small to intermediate interaction strengths.
The thesis starts with a study of the doping dependence of the antiferromagnetic phase transition in four different five-orbital models. We use the random-phase approximation to determine the transition temperature, the dominant ordering vector, and the contribution of the different orbitals to the ordering. This allows us to identify the more realistic models, which give results that are in good agreement with experimental observations. In addition to the frequently made assumption of orbital-independent interaction potentials we study the effect of a reduction of the interaction strengths that involve the d_{xy} orbital. We find that this tunes the system between two different nesting instabilities. A reduction of the interactions that involve the d_{xy} orbital also enhances the tendency towards incommensurate (IC) order. For a weak reduction this tendency is compensated by the presence of the orthorhombic phase. However, for a reduction of 30%, as it is suggested by constrained random-phase-approximation calculations, we always find large doping ranges, where a state with IC order has the highest transition temperature.
We continue the investigation of the magnetic phase transition by studying the competition of different possible types of antiferromagnetic order that arises from the presence of two degenerate nesting instabilities with the ordering vectors (pi,0) and (0,pi). We derive a Ginzburg-Landau free energy from a microscopic two-band model and find that the presence of the experimentally observed stripe phase strongly depends on the number and size of the hole pockets in the system and on the doping. We show that within the picture of a purely magnetically driven nematic phase transition, which breaks the C_4 symmetry and induces the orthorhombic distortion, the nematic phase displays exactly the same dependence on the model parameters as the magnetic stripe phase. We propose that in addition to the purely magnetically driven nematic instability there is a ferro-orbital instability in the system that stabilizes the nematic transition and, thus, explains the experimentally observed robustness of the orthorhombic transition. We argue that including a ferro-orbital instability into the picture may also be necessary to reproduce the transition from simultaneous first-order transitions into an orthorhombic antiferromagnetic state to two separate second-order transitions, which is observed as a function of doping.
Finally, a study of the superconducting phase transition inside the antiferromagnetic phase that is observed in some pnictide compounds is presented. We present an approach to calculate the fluctuation-mediated pairing interaction in the spin-density-wave phase of a multiband system, which is based on the random-phase approximation. This approach is applied to a minimal two-band model for the pnictides to study the effect of the various symmetry-allowed bare on-site interactions on the gap symmetry and structure. We find a competition between various even- and odd-parity states and over a limited parameter range a p_x-wave state is the dominant instability. The largest part of the parameter space is dominated by even parity states but the gap structure sensitively depends on the bare interactions. We propose that the experimentally observed transition from a nodeless to a nodal gap can be due to changes in the on-site interaction potentials.
34
Back, Danielsson Ing-Marie. "Masking Moments : The Transitions of Bodies and Beings in Late Iron Age Scandinavia." Doctoral thesis, Stockholm : Department of Archaeology and Classical Studies, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6737.
Full text
35
Fric, Jan. "Možnosti zvýšení užitných vlastností lehčeného cihlářského střepu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225888.
Full textAbstract:
This diploma thesis will discuss possibilities of using nanofibres to increase the strenght of the brick body, replacement of the current schrinkage reducing agent – quartz sand by stone dust, the use of flocculants as pore-forming agent and coloration of the body using iron trioxide.
36
Herting, Gunilla. "Metal release from stainless steels and the pure metals in different media." Licentiate thesis, Stockholm, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-330.
Full text
37
Hrabovský, Jan. "Biodegradabilní kostní implantáty na bázi železa." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442443.
Full textAbstract:
This work deals with a current topic, which are biodegradable bone implants. These implants seem to be a suitable candidate for temporary fixations, with their gradual decomposition. An important parameter is not only the mechanical properties so that the material can withstand the load, but above all the corrosion properties and the degradation process. This work introduces the physiology of bone, trace elements and also describes current trends in the field of implants. The last part is a theoretical introduction to cross-stage processes. The practical part is focused on the preparation of iron-based samples with various dopants, subsequent annealing and analysis.
38
Mason, Lizabeth Dutilly. "American Masculinity in Crisis: Trauma and Superhero Blockbusters." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277140451.
Full text
39
Herting, Gunilla. "Bioaccessibility of Stainless Steels : Importance of Bulk and Surface Features." Doctoral thesis, KTH, Korrosionslära, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4773.
Full textAbstract:
With increasing environmental awareness, the desire to protect human beings and the environment from adverse effects induced by dispersed metals has become an issue of great concern and interest. New policies, such as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) within the European Community, have been implemented to reduce hazards posed by the use of chemicals on producers and downstream users. The generation of exposure assessment data and relevant test procedures able to simulate realistic scenarios are essential in such legislative actions. This doctoral study was initiated to fill knowledge gaps related to the metal release process of stainless steels. A wide range of stainless steel grades, fourteen in total, were investigated. They cover a very broad range of applications, and the focus in the thesis was to simulate a few selected exposure scenarios: precipitation, the human body and food intake. Comparisons were made between metal release from stainless steel alloys and the pure metals that constitute each stainless steel in order to explore the differences between alloys and pure metals, and to provide quantitative data on metal release rates of different alloy constituents. Because of similar surface properties between stainless steel and pure chromium, this metal exhibits similar release rates, whereas iron and nickel exhibit significantly lower release rates as alloy components than as pure metals. Detailed studies were also performed to elucidate possible relations between metal release and steel surface properties. Key parameters turned out to be chromium enrichment of the self-passivating surface film, surface roughness, the electrochemically active surface area and the microstructure of the steel substrate. The degree of metal release increased with decreasing chromium content in the surface oxide, increasing surface roughness, and increasing presence of inhomogeneities in the bulk matrix. More detailed studies were initiated to possibly correlate the nucleation of metastable pits and the extent of metal release. Evidence was given that metastable pits exist even when the stainless steel is passive, and may cause extremely short-lived bursts of released metal before the surface film repassivates again.QC 20100810
40
Khazaei, Tahereh. "De l’individualité familiale à l’identification composite : La compréhension de l’expérience de genre des migrant.e.s iranien.ne.s en France." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0214.
Full textAbstract:
Cette thèse propose une analyse sociologique compréhensive du travail d’individuation et d’identification de genre des migrant.e.s iranien.ne.s en France et s’inscrit dans la question sociologique plus générale des formes d’adaptation des acteurs à un nouvel environnement social, moral et normatif. C’est particulièrement le cas entre la France et l’Iran en raison des contrastes concernant les identités et les rôles de genre et la sexualité. La thèse a pour objectif de répondre à deux questions. Comment ces personnes migrantes font-elles pour adapter leur travail d’identification de genre forgée en Iran aux nouvelles normes et aux nouveaux attendus propres à une société française, non plus imaginée depuis l’Iran, mais éprouvée socialement ? Symétriquement, quels sont ces attendus et ces normes de genre propres à la société française que doivent découvrir, comprendre et prendre en compte (d’une manière ou d’une autre) ces hommes et ces femmes venus d’Iran ? L’idée qui guide la recherche est que l’appareillage théorique classique (acculturation, intégration, socialisation) ne permet sans doute pas de rendre compte de la dimension composite d’une adaptation au nouvel environnement qui combine à la fois l’adoption de nouvelles normes et pratiques, la conservation de ce qui n’est pas flexible dans l’habitus et/ou les convictions religieuses et la syncrétisation d’une néo-ethnicité irano-française. L’enquête a été réalisée par entretiens et observation au sein des espaces domestiques auprès d’hommes et de femmes ayant été totalement socialisés au sein de la société postrévolutionnaire iranienne et qui, devenus migrants en France, doivent comprendre (en une « ethnologie inversée ») et s’adapter aux normes françaises de féminité par le vêtement, aux interactions entre les hommes et les femmes, et à une sexualité dissociée de la conjugalité, le tout dans un contexte fortement contraint par les stéréotypes négatifs envers les migrants du Sud et les musulmans. Ce travail d’individuation peut se résumer au final par l’articulation sous tension entre deux principales dimensions de leur expérience : une « individualité familiale » issue de leur socialisation en Iran et qui est partie-prenante d’une « identification composite » faite d’un travail continu et réflexif d’ajustement social et subjectifThis thesis proposes a comprehensive sociological analysis of the work of individuation and gender identification of Iranian migrants in France, as a part of the broader sociological question of the adaptation of actors to a new social, moral and normative environment. This is particularly the case between France and Iran because of the contrasts concerning identities and gender roles and sexuality. The thesis aims to answer two questions. How do these migrant people adapt their gender identification forged in Iran to the new norms and expectations of a French society, no longer imagined from Iran, but socially experimented? Symmetrically, what are these expectations and norms of gender specific to the French society that must discover, understand and take into account (in one way or another) these men and women from Iran? The idea that guides the research is that the classical theoretical apparatus (acculturation, integration, socialization) probably does not allow to account for the composite dimension of an adaptation to the new environment that combines both the adoption of new norms and practices, the preservation of what is not flexible in habitus and / or religious convictions and the syncretization of an Iranian-French neo-ethnicity. The survey was conducted through interviews and observation in domestic spaces with men and women who have been fully socialized in the post-revolutionary Iranian society and who, having become migrants in France, must understand (through an "inverted ethnology" ) and adapt to French norms of femininity through clothing, interactions between men and women and a sexuality divorced from conjugality, all in a context strongly constrained by negative stereotypes towards migrants from the South and Muslims. This work of individuation can be summed up in the end by the tension between two main dimensions of their experience: a "family individuality" stemming from their socialization in Iran, which is a complicated part of a new "composite identification" made through a continuous and reflexive work of social and subjective adjustments
41
Jonsson, Alexander. "Får- och byggnadskroppsdelar : Handlingar och spatiala relationer kring byggnadsdeponeringar på Öland." Thesis, Linnéuniversitetet, Institutionen för kulturvetenskaper (KV), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-100301.
Full textAbstract:
Får- och byggnadskroppsdelar - Handlingar och spatiala relationer kring byggnadsdeponeringar av får på Öland. Sheep and building body parts - Actions and spatial relations regarding buildingdeposits of sheep on Öland. Abstract This essay studies ten Ölandic examples of sheep bodies or sheep body parts deposited in Iron Agebuildings. In addition to literary works, the source material examined in the essay also consists ofunpublished sources and two osteological examinations, which were carried out as a part of thework on the essay (appendix 1 & 2).The purpose of the essay is to study both the actions that become visible through the skeletalmaterial, and the possible presence of spatial patterns regarding the bone deposits. The work iscarried out using an action-theoretical approach. Furthermore, a comparative method is used toexamine the ten sites in relation to each other. The results from this are ambiguous. The thesis' mainconclusion is; 1) that the bodies of sheep was sometimes disintegrated on Öland during the IronAge, to be; 2) placed in a certain spatial proximity of the foundation of roof-supporting posts. Keywords: Öland, Iron Age, Ritual Deposits, Sheep, bodies, body parts, foundation, sacrifice, action-theory
42
Zacharopoulos, Marios. "Simulation numérique des fissures et du comportement ductile-fragile de l’aluminium et du fer." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066038/document.
Full textAbstract:
L'objectif principal de la présente dissertation est d'étudier le rôle des fissures pointues sur le comportement mécanique des cristaux sous charge à l'échelle atomique. La question d'intérêt est la façon dont un cristal pur, qui contient une seule fissure en équilibre mécanique, se déforme. Deux métaux ont été considérés: l'aluminium, qui est ductile à toute température, et le fer, transformé de ductile en fragile à une température décroissante inférieure à T=77K. Les forces de cohésion dans les deux métaux ont été modélisées via les potentiels phénoménologiques "n-body". A (010)[001] mode I nano-crack a été introduit dans le réseau cristallin parfait de chacun des métaux étudiés en utilisant des déplacements appropriés attribués par l'élasticité anisotrope. A T=0K, des configurations de fissures à l'équilibre ont été obtenues par minimisation d'énergie avec un type mixte de conditions aux limites. Les deux modèles ont révélé que les configurations de fissures restaient stables sous une gamme finie de contraintes appliquées en raison de l'effet de piégeage en treillis. La présente thèse propose une nouvelle approche pour interpréter le comportement mécanique intrinsèque des deux systèmes métalliques sous le chargement. En particulier, la réponse ductile ou fragile d'un système cristallin peut être déterminée en examinant si la barrière de piégeage en treillis d'une fissure préexistante est suffisante pour provoquer le glissement de dislocations statiques préexistantes. Les résultats des simulations ainsi que les données expérimentales démontrent que, selon le modèle proposé, l'aluminium et le fer sont ductiles et fragiles à T=0K, respectivementThe principal aim of the present dissertation is to investigate the role of sharp cracks on the mechanical behaviour of crystals under load at the atomic scale. The question of interest is how a pure crystal, which contains a single crack in mechanical equilibrium, deforms. Two metals were considered: aluminium, ductile at any temperature below its melting point, and iron, being transformed from ductile to brittle upon decreasing temperature below T=77K. Cohesive forces in both metals were modeled via phenomenological n-body potentials. A (010)[001] mode I nano-crack was introduced in the perfect crystalline lattice of each of the studied metals by using appropriate displacements ascribed by anisotropic elasticity. At T=0K, equilibrium crack configurations were obtained via energy minimization with a mixed type of boundary conditions. Both models revealed that the crack configurations remained stable under a finite range of applied stresses due to the lattice trapping effect. The present thesis proposes a novel approach to interpret the intrinsic mechanical behaviour of the two metallic systems under loading. In particular, the ductile or brittle response of a crystalline system can be determined by examining whether the lattice trapping barrier of a pre-existing crack is sufficient to cause the glide of pre-existing static dislocations on the available slip systems. Simulation results along with experimental data demonstrate that, according to the model proposed, aluminium and iron are ductile and brittle at T=0K, respectively
43
Zacharopoulos, Marios. "Simulation numérique des fissures et du comportement ductile-fragile de l’aluminium et du fer." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066038.
Full textAbstract:
L'objectif principal de la présente dissertation est d'étudier le rôle des fissures pointues sur le comportement mécanique des cristaux sous charge à l'échelle atomique. La question d'intérêt est la façon dont un cristal pur, qui contient une seule fissure en équilibre mécanique, se déforme. Deux métaux ont été considérés: l'aluminium, qui est ductile à toute température, et le fer, transformé de ductile en fragile à une température décroissante inférieure à T=77K. Les forces de cohésion dans les deux métaux ont été modélisées via les potentiels phénoménologiques "n-body". A (010)[001] mode I nano-crack a été introduit dans le réseau cristallin parfait de chacun des métaux étudiés en utilisant des déplacements appropriés attribués par l'élasticité anisotrope. A T=0K, des configurations de fissures à l'équilibre ont été obtenues par minimisation d'énergie avec un type mixte de conditions aux limites. Les deux modèles ont révélé que les configurations de fissures restaient stables sous une gamme finie de contraintes appliquées en raison de l'effet de piégeage en treillis. La présente thèse propose une nouvelle approche pour interpréter le comportement mécanique intrinsèque des deux systèmes métalliques sous le chargement. En particulier, la réponse ductile ou fragile d'un système cristallin peut être déterminée en examinant si la barrière de piégeage en treillis d'une fissure préexistante est suffisante pour provoquer le glissement de dislocations statiques préexistantes. Les résultats des simulations ainsi que les données expérimentales démontrent que, selon le modèle proposé, l'aluminium et le fer sont ductiles et fragiles à T=0K, respectivementThe principal aim of the present dissertation is to investigate the role of sharp cracks on the mechanical behaviour of crystals under load at the atomic scale. The question of interest is how a pure crystal, which contains a single crack in mechanical equilibrium, deforms. Two metals were considered: aluminium, ductile at any temperature below its melting point, and iron, being transformed from ductile to brittle upon decreasing temperature below T=77K. Cohesive forces in both metals were modeled via phenomenological n-body potentials. A (010)[001] mode I nano-crack was introduced in the perfect crystalline lattice of each of the studied metals by using appropriate displacements ascribed by anisotropic elasticity. At T=0K, equilibrium crack configurations were obtained via energy minimization with a mixed type of boundary conditions. Both models revealed that the crack configurations remained stable under a finite range of applied stresses due to the lattice trapping effect. The present thesis proposes a novel approach to interpret the intrinsic mechanical behaviour of the two metallic systems under loading. In particular, the ductile or brittle response of a crystalline system can be determined by examining whether the lattice trapping barrier of a pre-existing crack is sufficient to cause the glide of pre-existing static dislocations on the available slip systems. Simulation results along with experimental data demonstrate that, according to the model proposed, aluminium and iron are ductile and brittle at T=0K, respectively
44
Ashurian, Nicole. "Bodyscapes : body to body, body to city, body to self." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118683.
Full textAbstract:
Thesis: M. Arch., Massachusetts Institute of Technology, Department of Architecture, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 106-107).
Our modern spaces are a result of a history of architects losing agency to technology. In the era of climate control spaces and the digital interfaces of social media, a sense of place and association with others is lost to enclosed spaces of satellite conversations detailed with attention to standardization rather than customization. These desires for comfort and control manifest in the lack of friction in our built realm. Spaces mirror the scaleless quality of the digital, impose no physical friction of environment and allow for isolation between bodies in the same room. Boarded in these spaces with the disappearing digital threshold, our friends fall in the same political silos as ourselves, empathy for others falters, context is arbitrary and we never have to be 'alone' when we have our phones. The tech industry tries to offer solutions to alleviate these problems with apps and devices. However, without a violent change in environment - engaging the physicality of the body, its senses and its association to others and site, the problems will persist. 'Bodyscapes' is a series of provocations at varying scales that subvert the language of corporate standardization to allow new opportunities for human interface where the public and private realm meet.
by Nicole Ashurian.
M. Arch.
45
Nuttall, Robert Horan. "Aqueous hydrogen sulphide corrosion of iron, iron/chromium and iron/nickel alloys." Thesis, Robert Gordon University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358471.
Full text
46
Bramhagen, Ann-Cathrine. "Iron nutrition during early childhood factors influencing iron status and iron intake /." Malmö : Lund University, 2006. http://theses.lub.lu.se/scripta-archive/2006/04/13/med_1297/bramhagen_kappa.pdf.
Full text
47
Myhrman, Carl. "An Iron Lady for an Iron Throne." Thesis, Södertörns högskola, Institutionen för kultur och lärande, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-23005.
Full textAbstract:
Syftet med denna uppsats är att undersöka hur kvinnlighet framställs för att konstruera feministikonen Daenerys Targaryen i TV-serien Game of Thrones. För att uppnå mitt syfte har jag analyserat Daenerys karaktär samt personer hon interagerar med i serien. Jag har använt mig av en semiotisk bildanalys. Min teorianknytning utgörs huvudsakligen av feministisk medieforskning samt feministiska åskådningar. Materialet för min studie utgörs av fem scener från serien. Resultaten visar att framställningen av Daenerys karaktär blir en konstruktion av kvinnan med speciella band med naturen som för en kamp mot en mansdominerad kultur.
48
Chua-anusorn, Wanida. "Iron oxide deposits in iron overload diseases." Thesis, Chua-anusorn, Wanida (1997) Iron oxide deposits in iron overload diseases. PhD thesis, Murdoch University, 1997. https://researchrepository.murdoch.edu.au/id/eprint/52151/.
Full textAbstract:
Iron overload diseases such as thalassaemia are a major public health problem in many parts of the world. Excess iron deposited in such tissues occurs in the form of ultrafine particles of iron oxyhydroxide. At low levels of iron loading, the iron(III) oxyhydroxide particles are mostly found in the iron storage protein, ferritin. At higher levels of loading, iron(III) oxyhydroxide particles are found in insoluble aggregates known as haemosiderin. Three different structures of these iron deposits are known: (i) ferrihydrite (5Fe203.9H20), (ii) poorly crystalline goethite (α-FeOOH), and (iii) non-crystalline hydrated iron(III) oxyhydroxide.
In this thesis, Mössbauer spectroscopy has been used to study the form of iron oxyhydroxide present in the tissues of thalassaemic patients who had undergone regular blood transfusion and chelation therapy as well as those receiving little, if any, such treatment. The data show a higher fraction of non-haem iron occurs as the goethite-like form in patients undergoing regular transfusion and chelation treatment. The poorly crystalline goethite form was not found in normal human tissues.
To define further some of the factors involved in the deposition of these different iron oxides, an iron-loaded rat system was established. Two routes of administration were chosen. The first involved regular administration of red blood cells injected intraperitoneally for up to one year. The second involved the oral administration of carbonyl-iron as a dietary supplement for nearly two years. Mössbauer spectra of livers and spleens at 78 K consisted of a relatively intense central doublet with spectral parameters indicative of paramagnetic or superparamagnetic high-spin iron(III). Many spectra obtained from parenterally iron-loaded spleens and dietary iron-loaded livers also showed a clear sextet at 78 K, which is indicative of the presence of the goethite-like form of iron oxyhydroxide. The relative intensity of this sextet spectral component in the livers from the dietary iron-loaded rats increased significantly with the age of rats. In order to distinguish iron present in the parenchymal versus non-parenchymal cells in the livers, an indirect quantitative assessment of the iron concentration was performed from liver histological sections using computer-assisted morphometric analysis. The goethite-like form increased significantly as the fraction of iron in non-parenchymal cells increased (r = 0.71, p < 0.005), suggesting that its formation may be associated with the nonparenchymal cells.
The ultrastructure of the iron oxide deposits and associated organic components was studied using a combination of scanning probe microscopy and transmission electron microscopy. Liver samples with ferrihydrite or goethite-like haemosiderin were studied as well as aggregated ferritin in the form of ferritin crystals, ferrihydrite-like form of haemosiderin shows topographies of iron aggregation similar to In contrast, liver with goethite-like form of Liver tissue with the that found in the ferritin crystals, haemosiderin showed a different topography.
Haemosiderin was isolated from a selection of tissues. Crude haemosiderin from patients who had undergone regular blood transfusion and chelation therapy showed a high fraction of goethite-like form of iron oxyhydroxide with a wide range of particle size. Infrared spectroscopy indicated that the iron oxyhydroxide in haemosiderins is associated with organic components. The availability of the different forms of iron oxyhydroxide present in different haemosiderins was assessed using the iron chelator desferrioxamine. The percentage of iron released showed a negative correlation (r = 0.82, p < 0.001) with the percentage of goethite-like iron oxyhydroxide present in these haemosiderins.
In summary, these studies indicate that the chemical forms of iron oxyhydroxide deposits are related to their deposition, toxicity and relative ease of removal. The study has implications for the clinical management of different groups of thalassaemic patients.
49
Pappas, Adlerburg Nickolas T. "To Make Iron of Iron : A Comprehensive Analytical Study of Spade Shaped Iron Bars." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-144383.
Full textAbstract:
This thesis aims to provide adequate analytical information on the spade shaped iron bars of Norrland and central Sweden. While their significance has been thoroughly debated for decades, analytical research on them has been confined to cases of single artefacts or theoretical interpretations of their value, meaning and origin. In this study a comprehensive approach is taken into consideration. Based on X-Ray fluorescence (XRF), scanning electron microscopy (SEM) and metallographical analysis this thesis seeks to facilitate new interpretations on quality, production centres and usage based on analytical results. Aiming to settle some of the long lasting questions regarding the artefacts while producing results which can further the discussion by raising new questions, previously unasked.
50
Pappas, Adlreburg Nickolas. "To Make Iron of Iron : A Comprehensive Analytical Study of Spade Shaped Iron Bars." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145694.
Full textAbstract:
This thesis aims to provide adequate analytical information on the spade shaped iron bars of Norrland and central Sweden. While their significance has been thoroughly debated for decades, analytical research on them has been confined to cases of single artefacts or theoretical interpretations of their value, meaning and origin. In this study a comprehensive approach is taken into consideration. Based on X-Ray fluorescence (XRF), scanning electron microscopy (SEM) and metallographical analysis this thesis seeks to facilitate new interpretations on quality, production centres and usage based on analytical results. Aiming to settle some of the long lasting questions regarding the artefacts while producing results which can further the discussion by raising new questions, previously unasked.