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Dissertations / Theses on the topic 'Selenium'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Subirana, Manzanares Maria Àngels. "Selenium biofortification of wheat: Distribution and spatially resolved selenium speciation by synchrotron-based techniques." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/666886.

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El seleni és un micronutrient essencial pels humans. Té diversos rols en la salut i per tant, el seu consum a nivells òptims és altament beneficial. Tot i així, 500-1000 milions de persones al món pateixen dèficit de seleni, degut als baixos nivells de seleni als sòls del camps de conreu. La biofortificació dels cultius amb fertilitzants rics en seleni és la manera més efectiva de contrarestar la deficiència de seleni. Tot i així, la especiació de seleni és fonamental: les plantes són capaces de transformar el seleni inorgànic del sòl, com els ions selenit i selenat, en seleni orgànic, com el

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2

Browne, Danielle M. "Novel selenium catalysis." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54706/.

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This thesis describes work carried out on catalytic selenium reagents in a range of organic transformations. Four different areas have been investigated and are reported herein. Chapter 2 reports the unsuccessful development into prochiral ligands, where three different chalcogen atoms are incorporated into either a trisubstituted structure or into a crown ether ring. Then reports how these structures could attach to a metal atom and become chiral. A SSe I SeR Chapter 3 describes a range of selenium-based ligands, which has been used in the palladium allylic substitution reaction to see if the

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3

Nguyen, Nu Hoai Vi School of Chemical Engineering &amp Industrial Chemistry UNSW. "Photocatalytic reduction of cadmium and selenium ions and the deposition of cadmium selenide." Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2005. http://handle.unsw.edu.au/1959.4/20849.

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Titanium dioxide (TiO2) photocatalysis, which can oxidise or reduce organic and inorganic pollutants, is a developing technology for water and wastewater treatment. The current work investigates the photocatalytic reduction of cadmium and selenium species as the presence of these elements in water are of environmental concern. Although TiO2 has been widely used for the photocatalytic process, its light absorption is limited to the UV region of the solar spectrum. Hence, the current project also explores the possibility to deposit cadmium selenide (CdSe) onto TiO2 to extend the photoresponse to

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4

Hendrickx, Wouter R. L. "Selenium and prostate cancer." Thesis, University of East Anglia, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588614.

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Prostate cancer is the second most common diagnosed cancer and the third most common cause of death related to cancer among men in developed countries. Several epidemiological studies, prospective cohort studies and animal tumour models state an inverse relationship between selenium status and cancer incidence. Se- methylselenocysteine (SeMSC), present in garlic, onions, leeks and broccoli, has been shown to be the most effective anti-carcinogenic selenium form in animal models. The aim of the work presented in this thesis was to investigate the influence of selenium compounds (Se-methylseleno

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5

Saito, Ichitaro. "Amorphous selenium photoelectric devices." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610017.

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6

Shahzad, Sohail Anjum. "Novel selenium-mediated cyclisations." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54389/.

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The present work describes the selenium-mediated cyclofunctionalisations of alkenes. Three different areas are reported herein. Chapter 2 reports syntheses of several substrates for carbocyclisation reactions and use of selenium and Lewis acids resulting in various dihydronaphthalenes. These dihydronaphthalenes then acted as substrates for second ring forming reactions. This novel tandem double cyclisation comprises a carboannulation, a Friedel-Crafts reaction and a rearrangement. This cascade sequence has been proven to be a useful tool in the selective synthesis of dihydronaphthalenes and be

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7

Reiners, Roger. "Importance nutritionnelle du selenium." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR1M096.

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8

Gudavalli, Dileep. "Measurement of selenite reduction to elemental selenium by Stenotrophomonas maltophilia OR02." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1377876956.

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9

Andersson, André. "Selenium-Testing as a Service." Thesis, Linköpings universitet, Interaktiva och kognitiva system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132372.

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Selenium has been a method to test web applications for over a decade, it is interacting directly with the browser and has gained support from both browsers and the community. With the growing amount of browsers, mobile devices and operating systems which a web application is expected to work with, services providing these systems for testing web applications against has gained interest. These services provide testing as a service (TaaS), and runs Selenium-tests in the cloud. This research tried to compare the different services with each other in regard to flexibility, cost, simplicity and re

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10

Zhong, Liangwei. "Selenium in mammalian thioredoxin reductase /." Stockholm, 2000. http://diss.kib.ki.se/2000/91-628-4243-9/.

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11

Geoffroy, Nicolas. "Selenium removal from aqueous solutions." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104555.

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The aqueous chemistry of the reduction of selenious species by sodium dithionite, sodium sulfide, stannous chloride and sulfur dioxide/sulfite was studied. The resultant precipitates were characterized using different techniques, including scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. In the case of sodium dithionite, the research showed that, at initial pH below 1.7 and dithionite stoichiometric excess above three, less than 0.5 ug/L remained in solution less than a minute after the addition of the reagent. However, it was found that the precipitate, ma

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12

Reeve, K. M. "Selenium reagents in organic synthesis." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37829.

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13

Maciel, Dominguez Anabel. "Selenium-gene interactions involving microRNAs." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/1909.

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Selenium (Se) is an essential nutrient for health. In mammals Se is incorporated into ~25 selenoproteins in the form of the amino-acid selenocysteine encoded by the UGA codon through a complex interacting with selenocysteine insertion sequence (SECIS) in the 3’Unstralated Region. The selenoproteins have functions in antioxidant defence and redox control, thyroid hormone metabolism and mitochondrial metabolism. Previous scientific work has found that Se also affects a group of downstream targets. The aim of my work is to investigate whether expression of selenoproteins or the downstream targets

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14

Garland, Jacqueline M. "Studies in phosphorus-selenium chemistry." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3688.

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Phosphorus-Selenium chemistry has seen a surge in development over the last five to ten years thanks to the optimisation of the synthesis of 2,4-diphenyl-1,3,2,4-diselenadiphosphetane-2,4-diselenide, Woollins' Reagent. This selenium analogue of the well known Lawesson's Reagent has proved itself to be a valuable asset to modern inorganic chemistry, providing a route to novel heterocycles, as well as acting as a selenation reagent with a wide range of functional groups. A series of new ammonium phenylphosphonamidodiselenoate ligands were synthesised via the reaction of Woollins' Reagent with a

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15

Huang, Wenhu. "Extracellular glutathione peroxidase purification, immunoassay, nutritional regulation and clinical aspects /." Lund : Lund University Dept. of Applied Nutrition and Food Chemistry, 1996. http://catalog.hathitrust.org/api/volumes/oclc/38100668.html.

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16

Xiao, Tingting. "Chemical and synchrotron techniques for the characterization and development of functional foods. Plant biostimulant effects on Se enriching wheat." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670984.

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El seleni és essencial per a la salut humana Les fonts de Se s’obtenen en gran mesura del consum de vegetals, ja que el cos humà no pot sintetitzar de forma eficaç les espècies de Se orgànic assimilables. El selenit i el selenat són les formes inorgàniques predominants de Se que les plantes poden aborbir i metabolitzar en la seva major part en formes orgàniques assimilables per als animals i la ingesta humana. L’ús de fertilitzants amb Se s’està convertint en una pràctica comú en regions deficients en aquest element per poder obtenir així cultius i aliments enriquits amb Se. Malgrat això, enca

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17

Björkhem, Bergman Linda. "Thioredoxin reductase and selenium in carcinogenesis and multidrug resistance /." Stockholm, 2004. http://diss.kib.ki.se/2004/91-7349-954-4/.

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18

Esterhuyse, Jacobus Johannes. "The effects of different selenium sources on the meat quality and bioavailability of selenium in lamb." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71894.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: In many parts of the world, soil is depleted of selenium (Se), leading to selenium-poor plants, animals and, therefore, humans. It was recognised that a study to examine the functionality of new products on the market to address this problem was required. The purpose of this research were threefold: to compare the effects of sodium selenite (NaSe) and organically bound selenium sources on small ruminant performance, to investigate the bioavailability of these Se sources, and analyse their influence on carcass characteristi

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19

Lyons, Graham Henry. "High-selenium wheat : biofortification for better health /." Title page, table of contents and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09PH/09phl9915.pdf.

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20

Tan, Thatt Yang Timothy School of Chemical Engineering &amp Industrial Chemistry UNSW. "Photocatalytic reduction of selenate and selenite : water/wastewater treatment and the formation of nano-selenium compounds." Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2003. http://handle.unsw.edu.au/1959.4/20448.

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The current work investigates the photocatalytic reduction of selenium (Se) ions, selenate Se(VI) and selenite Se(IV), from two perspectives: Se ion removal from water and wastewater and the formation of nano-Se compounds. Se ion pollution has become an environmental issue in recent years, and hence there is an urgent need for an efficient removal technique. In addition, there is increasing interest in the formation of nano-size semiconductors for niche applications. Since Se is a semiconductor, its formation onto the semiconductor TiO2 could lead to the discovery of new composite materials. T

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21

Puranen, Anders. "Near field immobilization of selenium oxyanions." Doctoral thesis, KTH, Kärnkemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26994.

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The topic of this doctoral thesis is the potential near field immobilization of the radionuclide 79Se after intrusion of groundwater into a spent nuclear fuel canister in a repository. 79Se is a non naturally occurring long lived selenium isotope formed as a result of fission in nuclear fuel. Given the long half life (~3 x 105 y) and that the oxyanions of selenium are expected to be highly mobile and potentially difficult toimmobilize the isotope is of interest for the long term safety assessment of high level waste repositories. In this work the near field has been limited to the study of pro

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22

Campbell, Sonja Gray. "Methylmercury Neurotoxicity and Interactions with Selenium." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33173.

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Methylmercury (MeHg) is a ubiquitous contaminant and potent neurotoxicant with no completely effective therapy, although selenium antagonises MeHg toxicity. Furthermore, nanoparticles are promising as a novel drug delivery system. We researched the potential of selenium nanoparticles (SeNPs) in antagonising MeHg neurotoxicity compared to selenomethionine (SeMet) using primary astrocyte cell cultures and examining outcomes related to oxidative stress. We found that SeNPs were more toxic than SeMet. Increasing SeNPs significantly decreased MeHg cellular uptake and MeHg significantly decreased up

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23

Majid, Amran A. "Analysis of selenium in environmental waters." Thesis, Loughborough University, 1987. https://dspace.lboro.ac.uk/2134/28139.

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14 MeV neutron activation analysis, based on the 82Se(n,2n) Se81m nuclear reaction, has been investigated for the measurement of selenium in environmental waters. The levels of the selenium present in environmental waters and the relatively high limit of detection achievable with fast neutron activation analysis resulted in the need to develop a concentration procedure for the extraction of selenium from large volumes of environmental water before neutron activation.

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24

Conley, Shannon Martha. "Selenium Effects on the Trabecular Meshwork." Tucson, Arizona : University of Arizona, 2006. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1402%5F1%5Fm.pdf&type=application/pdf.

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25

Matni, Gisèle. "Speciation of selenium in food supplements." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40393.

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Selective isolation protocols of selenium (Se) species integrated to Se specific atomic absorption spectroscopy (AAS) detection were developed and optimized for Se speciation in food supplements, including selenized yeasts. By ultrafiltration, 69.18% of Se in the extract was found as a low molecular weight soluble form, the remaining 30.82% was bound to high molecular weight components. After a cation-exchange chromatography of the ultrafiltrate, 3.77% of the Se in the extract was found in the aqueous washings of the column indicating the presence of free inorganic anions of Se; the 65.41% of

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26

Pan, Jin 1959. "Characteristics of selenium schottky diode structures." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61722.

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27

Kyle-Ferguson, Sarah E. "Increasing the selenium content of plants." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526204.

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28

Crowther, Sarah Anne. "The electronic spectrum of selenium dioxide." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:095869d8-8f74-495d-885c-cba28aef3d4b.

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The C͂¹B₂ ←　X͂¹A₁ electronic transition of SeO₂ has been investigated under high resolution, at a rotational temperature of around 10 K, using the technique of Laser Excitation Spectroscopy. The vibrationally-resolved survey spectrum contained around 100 new bands in addition to the bands which had been reported in a previous study of the same region (G.W. King and P.R. McLean, J. Mol. Spec. 51, 1974). In the light of this new spectrum a number of bands have been reassigned, most significantly the O⁰₀ band, and a number of progressions have been extended. This led to a revised determination of

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29

Wood, Paul Thomas. "Phosphorus-sulphur and phosphorus-selenium heterocycles." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47312.

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30

Aborode, Fatai Adigun. "Selenium and arsenic speciation in plants." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201647.

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Selenium and arsenic are important metalloids in the food chain from nutritional and toxicological point of view. These two metalloids are potentially enriched through geogenic processes and anthropogenic activities and they could sometimes co-exist in nature and become available to plants thereby entering the food chain. While selenium is known as an essential element to humans, it could also be toxic. Arsenic on the other hand is a potentially toxic element posing serious health risks to livestock and humans. They have been found to neutralise each other’s effects in animals but their intera

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31

Al-Attar, A. F. "Selenium and trace metals as pollutants." Thesis, University of Bristol, 1987. http://hdl.handle.net/1983/1858b91b-362e-422f-b91c-84aa44e23e90.

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32

Kling, Willig Fabian. "Selenium Recovery in Precious Metal Technology." Thesis, Umeå universitet, Kemiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-86735.

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33

Conley, Shannon Martha. "Selenium Effects on the Trabecular Meshwork." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/195533.

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Epidemiological evidence indicates that selenium supplementation may increase risk for ocular hypertension and glaucoma. The purpose of this project was to determine the effects of selenium on the conventional "trabecular" aqueous outflow pathway, a likely site of pathology for glaucoma. Human trabecular meshwork (HTM) cells and human umbilical vein endothelial cells (HUVECs) were treated with selenium (MSeA) at or near physiologically relevant concentrations. Selenium uptake by cells was monitored using mass spectrometry. While detectible changes in intracellular selenium were observed aft

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34

DUBALD, SYLVIE. "Role du selenium en nutrition humaine." Strasbourg 1, 1989. http://www.theses.fr/1989STR15006.

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35

Ali, Johar. "Performance, tissue selenium concentration and glutathione peroxidase activity as response variables for determining selenium requirements of poultry /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9999267.

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36

Garcia, Civit Marc. "Activation of B-interElement (E=S, Se) reagents towards selective C-S and C-Se bond formation." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/454746.

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Aquetsa tesi descriu el treball realitzat amb reactius que contenen enllaços bor-sofre o bor-seleni. Aquest reactius s’han fet servir en reaccions de tioboració i selenoboració de substrats amb insaturacions conjugades a cetones o esters i en reaccions d’inserció amb grups diazo per a sintetitzar nous compostos organosulfurats i organoselenats. La tesi es divideix en quatre capítols. El primer d’ell és una breu introducció al compostos organosulfurats i organoselenats, parlant sobre les seves principals aplicacions i els mètodes per sintetitzar-los més representatius fins al moment. En aquest

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37

Floor, Geerke Henriette. "Selenium cycling in volcanic environments: the role of soils as reactive interfaces." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/31831.

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Selenium (Se) is an element with important health implications that is emitted in significant amounts from volcanoes. Attracted by the fertility of volcanic soils, around 10% of the world population lives within 100 km of an active volcano. Nevertheless, the behaviour of Se in volcanic environments is poorly understood. Therefore, the main aim of this thesis is to investigate the role of soils in the Se cycling in volcanic environments. Prior to the geochemical studies, precise and accurate methods for the determination of Se contents, speciation and isotopic signatures were developed. Afterwa

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38

Hotz, Christine. "Effects of dietary selenium depletion and of dietary selenium and iodine interactions on thyroid hormone metabolism of rat." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq23345.pdf.

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39

Putarov, Thaila Cristina [UNESP]. "Avaliação de fontes de selênio e seus efeitos no perfil metabólico e condição reprodutiva de cães." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/95273.

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Made available in DSpace on 2014-06-11T19:27:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-17Bitstream added on 2014-06-13T19:56:23Z : No. of bitstreams: 1 putarov_tc_me_botfmvz.pdf: 721403 bytes, checksum: db6f049facb392575d608e413f06d369 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Universidade Estadual Paulista (UNESP)<br>O objetivo do trabalho foi comparar a biodisponibilidade e os efeitos antioxidantes de fontes de selênio na forma orgânica e inorgânica em dietas para cães. Foram utilizados 24 cães machos da raça Beagle distribuídos em três tr

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Frisk, Peter. "Expressions of mercury-selenium interaction in vitro." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-4913-1/.

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Cooper, Matthew A. "Selenium mediated cyclizations and reactions of selenones /." Title page, contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phc7776.pdf.

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Wang, Yan 1961. "Xerographic properties of chlorine-doped amorphous selenium." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68056.

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A study has been made of the xerographic properties of amorphous selenium doped with chlorine at concentrations below 100 parts per million (ppm) by weight. The sample consisted, in each case, of an aluminum plate with a thin deposited r.f. sputtered aluminum oxide film, on which a 50 micrometer layer of amorphous selenium was deposited by evaporation, with a substrate temperature of 50$ sp circ$C. It was found that the chlorine decreased the acceptance voltage following corona charging, increased the dark decay rate and decreased the residual voltage after illumination discharge. The changes

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Cabannes, Emmanuelle. "Sulphate transporters and selenium accumulation in Astragalus." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546495.

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Bates, C. M. "Pentamethylcyclopentadienyl (Cp*) compounds of selenium and tellurium." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636056.

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Successful preparations were: (<B>1</B>) bis(pentamethylcyclopentadienyl)selenium, prepared by the reaction of selenium diethydithiocarbamate with lithiated pentamethylcyclopentadiene; (<B>2</B>) Cp*Se<SUB>n</SUB>Li (n = 2,3,4), prepared by the reaction of elemental selenium with lithiated pentamethylcyclopentadiene in THF and its subsequent reaction with iodomethane to produce (<B>3</B>) methyl(pentamethylcyclopentadienyl)selenium or water to produce the polyselenide mixture (<B>4</B>) Cp*<SUB>2</SUB>Se<SUB>n</SUB> (n = 2,3,4). (<B>4</B>) was also produced by the low temperature reaction of s

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Stemm, Divinia Nolasco. "INTERACTIONS BETWEEN SELENIUM AND POLYCHLORINATED BIPHENYLS (PCBs)." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_diss/472.

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This study investigated the interaction between polychlorinated biphenyls (PCBs) and selenium to explain the mechanism involved that could affect selenium metabolism and its anti-cancer property. PCBs congeners and mixtures were previously found to reduce hepatic Se and Se-dependent glutathione peroxidase activity. I hypothesized that certain PCB congeners affect selenium metabolism in the rat liver resulting in diminished antioxidant capacity of selenoproteins, which could alter the ability of Se to protect against PCBs induced tumor promotion. In the first study, the influence of 3,3,4,4-tet

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Al-Tekrity, Sabah S. A. "Selenium metabolism and deficiency in ruminant animals." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305816.

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Stokes, Sarah. "Speciation studies on selenium in bio-fluids." Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434964.

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Leita, Gabriele. "How to electrochemically store potassium in selenium." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24399/.

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Potassium-selenium (K-Se) batteries are an interesting alternative to lithium-selenium (Li-Se) batteries with some notable advantages, such as a reduced cost of production and an environmentally cleaner way of production. Although the idea of K-Se batteries emerged a couple of years ago, in the last few years they have been taken seriously as a capable energy storage. Despite some disadvantages, such as a cathode volume expansion and the shuttle effect, it is considered as an interesting research field and many studies have been carried out. Herein, a carbon host to encapsulate selenium was ma

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Lima, Leonardo Warzea [UNESP]. "Selenium and sulfur: mitigation in plant stresses." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138897.

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Lima, Leonardo Warzea. "Selenium and sulfur : mitigation in plant stresses /." Jaboticabal, 2016. http://hdl.handle.net/11449/138897.

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Abstract:

Orientador: Priscila Lupino Gratão<br>Coorientador: André Rodrigues dos Reis<br>Banca: Tiago Tezotto<br>Banca: Tiago Santana Balbuena<br>Abstract: Plants do not have specific defense mechanisms to counteract the diverse range of abiotic stresses and pollutants into the environment, and its survival depends on the flexibility and adaptability of its own natural defense mechanisms. Furthermore, the maintenance of cellular homeostasis depends on several interlinked and complex mechanisms, while the cellular defense system does not follow a specific pattern of action and may differ due to various

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