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Dissertations / Theses on the topic 'Actinium'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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1

Waldek, Achim Marcus. "Bestimmung der Ionisationsenergie von Actinium und Ultraspurenanalyse von Plutonium mit resonanter Ionisationsmassenspektrometrie (RIMS)." [S.l. : s.n.], 2000. http://ArchiMeD.uni-mainz.de/pub/2001/0071/diss.pdf.

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2

Niese, Siegfried. "Discovery of actinium and the thorium isotope 230Th." Siegfried Niese, 2017. https://slub.qucosa.de/id/qucosa%3A7825.

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In 1902 Friedrich Giesel has discovered after co-precipitation with lanthanum from samples obtained by chemical treatment of uranium minerals a new radioactive element. Because of its emanating properties he named it emanium, which we now know as actinium. In 1899 André-Louis Debierne found a radioactive substance with chemical properties of titanium, and after further investigations in 1900 of thorium. Because of its high activity he explained it as a new element and named it actinium. It mainly consisted of 230Th. In 1904 he explained that his actinium was identical with the emanium found by

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3

Niese, Siegfried. "Die Entdeckung des Actiniums." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-152864.

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Friedrich Giesel entdeckte im Jahre 1902 das Actinium nach Fällung mit Lanthan aus einer Pechblendelösung. Er hatte den Namen Emanium vorgeschlagen, da es stark emanierte. Lange Zeit wurde nur Andre-Louis Debierne als Entdecker des Actiniums akzeptiert, da er 1904 behauptet hatte, dass die von ihm im Jahr 1900 gefundene von ihm Actinium genannte radioaktive Substanz mit den chemischen Eigenschaften des Thoriums, die hauptsächlich das Thoriumisotop 230Th enthielt, mit dem Emanium von Giesel identisch gewesen sei. In dem Beitrag werden die Entdeckungen von Debierne und Giesel und der Weg bis zur

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4

Geibert, Walter. "Actinium-227 als Tracer für Advektion und Mischung in der Tiefsee = Actinium-227 as a tracer for advection and mixing in the deep-sea /." Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung, 2001. http://www.awi-bremerhaven.de/GEO/Publ/PhDs/WGeibert.

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5

Niese, Siegfried. "Die Entdeckung des Actiniums." Gesellschaft Deutscher Chemiker, 2013. https://slub.qucosa.de/id/qucosa%3A4674.

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Friedrich Giesel entdeckte im Jahre 1902 das Actinium nach Fällung mit Lanthan aus einer Pechblendelösung. Er hatte den Namen Emanium vorgeschlagen, da es stark emanierte. Lange Zeit wurde nur Andre-Louis Debierne als Entdecker des Actiniums akzeptiert, da er 1904 behauptet hatte, dass die von ihm im Jahr 1900 gefundene von ihm Actinium genannte radioaktive Substanz mit den chemischen Eigenschaften des Thoriums, die hauptsächlich das Thoriumisotop 230Th enthielt, mit dem Emanium von Giesel identisch gewesen sei. In dem Beitrag werden die Entdeckungen von Debierne und Giesel und der Weg bis zur

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6

Bray, Travis Henry Albrecht-Schmitt Thomas E. "Crossroads and terminations in transuranium chemistry." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SUMMER/Chemistry_and_Biochemistry/Dissertation/Bray_Travis_43.pdf.

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Thesis (Ph. D.)--Auburn University, 2008.<br>Abstract. Vita. Parts of this dissertation have been published as: Na₂[UO₂(IO₃)₄(H₂O)] (Ch. 2: Bray, T.H.; et al., Inorg. Chem., 2006, 45, 8251-8257.), An(IO₃)₄(An = Np, Pu) and Np(IO₃)₄·nH2O (Ch. 3: Bray, T.H.; et al., Inorg. Chem., 2007, 46, 3663-3668.), Pu(SeO₃)₂ (Ch. 4: Bray, T.H.; et al., J. Solid State Chem., 2008, 181, 493-498.), NpFPO₄ and Cs₂Np₂F₇PO₄ (Ch. 5: Bray, T.H.; et al., J. Solid State Chem., 2007, 180, 70-74.), [C₆H₁₄N₂][(UO₂)₄(HPO₄)₂PO₄)₂(H₂O)]·H₂O (Ch. 6: Bray, T.H.; et al., "Synthesis and Structure of [C6H14N2][(UO2)4(HPO4)2(PO4)

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7

VanSant, Paul Daniel. "Medical Isotope Production of Actinium 225 By Linear Accelerator Photon Irradiation of Radium 226." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/50984.

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There is a present and future need for the medical isotope Actinium-225, currently in short supply worldwide. Only a couple manufacturers produce it in very low quantities. In roughly the past 10 years the medical community has explored the use of Ac-225 and its daughter Bismuth-213 for targeting a number of differing cancers by way of Targeted Alpha Therapy (TAT). This method utilizes the alpha-decay of both Ac-225 (half-life 10 days) and Bi-213 <br />(half-life 46 min) to kill cancerous cells on a localized basis. Maximum energy is delivered to the cancer cells thereby greatly minimizing

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8

Melville, Graeme P. "Production of AC-225 for cancer therapy by photon induced transmutation of RA-226." Thesis, View thesis, 2007. http://handle.uws.edu.au:8081/1959.7/18860.

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Radium needles that were once implanted into tumours as a cancer treatment are now obsolete and constitute a radioactive waste problem, as their half-life is 1600 years. The reduction of radium by photonuclear transmutation by bombarding Ra-226 with high-energy photons from a medical linac has been investigated. The irradiated needles would then be processed to remove the Ac-225, which can then be used for .Targeted Alpha Therapy. (TAT) of cancer. This project has the potential to slowly reduce obsolete radioactive material, and displace future expensive importation of Ac-225 from Russia, Germ

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9

Moulin, Jeanne. "Comportement des radionucléides des familles de l'uranium dans les eaux superficielles du site de la Crouzille, Limousin : implications géochimiques." Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1099.

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La compréhension du comportement des radionucléides naturels en milieu continental est importante pour pouvoir mener à bien la réhabilitation d’un site minier uranifère et préserver la qualité de l’eau. L’objectif de cette thèse est à la fois de déterminer la source d’apports de radionucléides dans une réserve d’eau potable et d’améliorer la connaissance du comportement des radionucléides des familles de l’uranium, en particulier de l’actinium. Le site d’étude retenu se situe à proximité d’un site minier réhabilité et permet d’étudier le transport des radionucléides dans les eaux superficielle

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10

Levier, Martin. "Développement et utilisation de l'Actinium-227 comme traceur du mélange de l'océan profond." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASJ006.

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Le mélange vertical dans l'océan profond est un processus important pour le fonctionnement de la circulation thermohaline océanique et donc pour le système climatique global. L'actinium-227 (227Ac) est un isotope radioactif naturel produit par désintégration du protactinium-231 (231Pa) dans les sédiments marins profonds. Comme il est soluble, il diffuse dans les eaux de fond. Sa demi-vie courte (22 ans) en fait un traceur spécifique du mélange vertical dans l'océan profond. L'analyse de 227Ac par comptage nucléaire utilisé jusqu'à maintenant nécessite de 50 à plusieurs centaines de litres d'ea

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11

Le, Roy Emilie. "Distribution des radionucléides naturels (226Ra et 227Ac) le long de la section GA01 dans l'Atlantique Nord." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30226.

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L'Atlantique Nord subpolaire, région de formation de masses d'eau profonde, est une région clé pour la circulation thermohaline mondiale et est donc sensible au changement climatique. C'est dans ce contexte que la campagne GEOVIDE a été réalisée entre le Portugal, le Groenland et Terre-Neuve dans le cadre du programme GEOTRACES (GA01 ; 15 mai au 30 juin 2014-R/V Pourquoi Pas ?). Cette campagne ayant traversé différentes caractéristiques topographiques et régions biogéochimiques, a fourni un cadre unique pour l'étude i) du mélange océanique, ii) du transport des masses d'eau et iii) des apports

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12

Melville, Graeme P. "Production of AC-225 for cancer therapy by photon induced transmutation of RA-226." View thesis, 2007. http://handle.uws.edu.au:8081/1959.7/18860.

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Thesis (Ph.D) -- University of Western Sydney, 2007.<br>A thesis submitted to the University of Western Sydney, College of Health and Science, School of Engineering, in satisfaction of the requirements for the degree of Doctor of Philosophy. Includes bibliography.

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13

Baeza, Mario Ivan. "Synthesis and characterization of acetylenic derivatives of the actinide extractant (aryl)-N,N-di-(alkyl)carbamoylmethylphosphine oxide (CMPO)." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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14

Marx, Sebastian [Verfasser], Andreas [Akademischer Betreuer] Türler, and Klaus [Akademischer Betreuer] Köhler. "Radium-Aufreinigung zur Herstellung von Actinium-225 am Zyklotron für die Alpha-Immuntherapie / Sebastian Marx. Gutachter: Andreas Türler ; Klaus Köhler. Betreuer: Andreas Türler." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1067271414/34.

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15

Gasparro, Joël. "Études par séparation chromatographique des décroissances α[alpha] de 229Th, 225Ac et 221Fr : application à la structure des états nucléaires de 225Ra, 221Fr et 217At". Nice, 2000. http://www.theses.fr/2000NICE5443.

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Ce mémoire concerne l'étude par spectrométrie gamma directe du mode de désexcitation des niveaux du radium 225, du francium 221 de l'astate 217 ainsi que du bismuth 213. Pour réduire l'intensité des raies émises lors de la désexcitation des descendants de chaque noyau étudié, nous avons mis au point des procédés d'élution chromatographique continue des produits de filiation. Ceux-ci ont permis d'obtenir des facteurs de décontamination satisfaisants, ce qui a rendu possible l'attribution de transitions non observées précédemment et entraîné une amélioration des connaissances des méthodes de dés

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16

Bishop, Alexander James. "Actinide surface chemistry." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54193/.

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The surface reactivity of thorium and uranium, and how this links to the 5f electrons, has been investigated under UHV conditions using X-ray photoelectron spectroscopy (XPS), ultra violet photoelectron spectroscopy (UPS), and inverse photoemission spectroscopy (IPES).  Water and ammonia adsorption on a polycrystalline thorium surface has been investigated at 100 and 298 K.  Water adsorbs and dissociates upon the surface, leading to the formation of oxide and hydroxide species at 298 K, and oxide, hydroxide, and physisorbed water at 100 K. The surfaces after adsorption at both temper

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17

Aaliti, Abdellatif. "Réactivité des liaisons sigma actinide-azote et actinide-carbone : applications en synthèse organique." Dijon, 1986. http://www.theses.fr/1986DIJOS015.

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Les isonitriles s'insèrent dans une ou deux liaisons sigma u-n des complexes cyclopentadienyles mono- ou bis-alkylaminouranium. La structure carbénoïde des composés d'insertion est établie par spectroscopie. On compare la réactivité de la liaison sigma uranium-méthylène et uranium-méthyle vis à vis des réactions d'insertion et des réactions de substitution par des composés à hydrogène "acide". La réaction d'insertion des composés carbonyles est appliquée à la synthèse chimio- et stéréosélective des alcools secondaires et tertiaires.

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18

Al-Farsi, Afkar Nadhim. "Radiological aspects of petroleum exploration and production in the sultanate of Oman." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/29817/1/Afkar_Al-Farsi_Thesis.pdf.

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This thesis is a study of naturally occurring radioactive materials (NORM) activity concentration, gamma dose rate and radon (222Rn) exhalation from the waste streams of large-scale onshore petroleum operations. Types of activities covered included; sludge recovery from separation tanks, sludge farming, NORM storage, scaling in oil tubulars, scaling in gas production and sedimentation in produced water evaporation ponds. Field work was conducted in the arid desert terrain of an operational oil exploration and production region in the Sultanate of Oman. The main radionuclides found were 226R

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Al-Farsi, Afkar Nadhim. "Radiological aspects of petroleum exploration and production in the sultanate of Oman." Queensland University of Technology, 2008. http://eprints.qut.edu.au/29817/.

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This thesis is a study of naturally occurring radioactive materials (NORM) activity concentration, gamma dose rate and radon (222Rn) exhalation from the waste streams of large-scale onshore petroleum operations. Types of activities covered included; sludge recovery from separation tanks, sludge farming, NORM storage, scaling in oil tubulars, scaling in gas production and sedimentation in produced water evaporation ponds. Field work was conducted in the arid desert terrain of an operational oil exploration and production region in the Sultanate of Oman. The main radionuclides found were 226R

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20

El-Lawindy, A. M. Y. "Spectroscopic studies in actinide nuclei." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372684.

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21

Flanders, David John. "Structural studies of actinide compounds." Thesis, University of Warwick, 1985. http://wrap.warwick.ac.uk/108758/.

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The work described in this thesis was an investigation into the coordination chemistry of uranium(VI) and neptunium(VI). Structural determinations of comparable uranium and neptunium compounds were used to examine the actinide contraction between uranium and neptunium, the changes in metal-ligand bond length on substituting nitrogen for oxygen as the donor atom and to establish the mode of coordination of certain ligands around the actinyl(VI) ion. These areas have been explored through the determination of the crystal structures of the following compounds:- a) The 2,2'-dipyridyl complexes [CO

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22

Wåhlin, Pernilla. "Theoretical Actinide Chemistry – Methods and Models." Doctoral thesis, Stockholms universitet, Fysikum, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-54848.

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The chemistry of actinides in aqueous solution is important, and it is essential to build adequate conceptual models and develop methods applicable for actinide systems. The complex electronic structure makes benchmarking necessary. In the thesis a prototype reaction of the water exchange reaction for uranyl(VI), for both ground and luminescent states, described with a six-water model, was used to study the applicability of density functional methods on actinides and different solvation models. An excellent agreement between the wave function methods CCSD(T) and MP2 was obtained in the ground

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23

Dickson, Catherine Louise. "Immobilisation of actinide simulants in cement." Thesis, University of Aberdeen, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300954.

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The current UK strategy for radioactive waste management is to permanently store the waste in an underground repository. Final disposal of the radwaste may then be preceded by chemical conditioning and physical encapsulation. The objective of this work was to determine the extent of actinide immobilisation in cement. Since actinides are hazardous and costly to study directly, a chemical analogue approach to studying actinide immobilisation was adopted. Th(IV), Ce(III, IV) and Eu(III) were chosen as actinide simulants and their suitability assessed by a critical review of the literature. Ca(OH)

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24

Visosky, Mark Michael. "Actinide minimization using pressurized water reactors." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41276.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.<br>Includes bibliographical references (p. 227-232).<br>Transuranic actinides dominate the long-term radiotoxity in spent LWR fuel. In an open fuel cycle, they impose a long-term burden on geologic repositories. Transmuting these materials in reactor systems is one way to ease the long-term burden on the repository. Examining the maximum possible burning of trans-uranic elements in Combined Non-Fertile and U02 (CONFU) PWR assemblies is evaluated. These assemblies are composed of a mix of sta

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25

Tassell, M. J. "Computational investigations of molecular actinide chemistry." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1386659/.

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This thesis is a computational study of the first members of the actinide series, thorium, protactinium, uranium, neptunium, plutonium, americium and curium. There are two general themes that occur throughout this thesis; the first is the electronic structures of the aforementioned actinides, and in particular what is the role of the 5f and 6d orbitals in the electronic structure of some early actinide complexes. The second is how covalent are the interactions between the early actinides and lighter members of the periodic table, in particular carbon, halogens and the chalcogens. The principal

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26

Brulé, Cédric. "Vieillissement musculaire : impact de la protéolyse intracellulaire calcium-dépendante." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13899/document.

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La sarcopénie ou perte involontaire progressive de la masse musculaire chez le sujet âgé s’accompagne de l’altération de nombreux phénomènes physiologiques comparables à ceux observés chez les myopathes. Le processus de régénération musculaire est très ralenti, les activités protéolytiques intracellulaires sont modifiées et de nombreuses fonctions cellulaires sont perturbées en raison d’un stress oxydatif incontrôlé. L’intervention des calpaïnes, protéases neutres calcium-dépendantes, dans les processus associés au développement, à la régénération et à l’intégrité du tissu musculaire est incon

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27

Farkas, Ildiko. "Coordination Chemistry of Actinide and Lanthanide Ions." Doctoral thesis, KTH, Chemistry, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3236.

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Farkas, Ildikó. "Coordination chemistry of actinide and lanthanide ions /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3236.

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29

Harvey, E. J. "Actinide immobilisation in zirconate and titanate ceramics." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603819.

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Pyrochlores (<i>A=2<sub>B</sub>2<sub>O</sub>7<sub>, </sub>Fd3m</i>) have been proposed as candidate phases for the immobilisation of actinides from high level nuclear waste. They may form part of a multi-barrier approach to final waste disposition in an underground repository. Titanate and zirconate pyrochlores are particularly interesting; titanates show high chemical durability, whilst some zirconate pyrochlores display very high resistance to structural damage by radiation. To fully evaluate the likely performance of a pyrochlore-based waste-form, a comprehensive understanding of its struct

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30

McCubbin, David. "Influence of seawater components upon actinide behaviour." Thesis, University of East Anglia, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359304.

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31

Kervazo, Sophie. "Computational actinide chemistry : structure, bonding and thermodynamics." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R042/document.

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La question générale traitée dans cette thèse est de déterminer si, à l’heure actuelle, nous disposons d’outils théoriques efficaces pour décrire la structure, la liaison et les propriétés thermodynamiques de système comprenant un actinide. Cette large question va être abordée à l’aide de trois études différentes. Les deux premières sont directement liées à l’industrie plastique et à la sureté nucléaire. La dernière, plus fondamentale concerne une analyse comparative d’une approche théorique nouvellement développée sur des systèmes comprenant des éléments f. Tout d’abord, les cations alkyles c

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32

Noyes, Karen Lynn 1977. "Synthesis and evaluation of actinide imprinted resins." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/30012.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2003.<br>Includes bibliographical references (p. 143-146).<br>Organic resins have previously shown good results with application to actinide separations. Large portions of recent research have been dedicated to the synthesis and evaluation of resins with phenolic-type functional groups. Other recent chemical research with lighter metals has developed a technique known as ion imprinting which can provide greater selectivity for the target metal ion. Initial work with ion imprinting and phenolic-type resins has

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33

Pheiffer, Fazlin. "Investigating the antimicrobial potential of Thalassomonas actiniarum." University of Western Cape, 2020. http://hdl.handle.net/11394/7995.

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Philosophiae Doctor - PhD<br>The World Health Organisation predicts that by the year 2050, 10 million people could die annually as a result of infections caused by multidrug resistant bacteria. Individuals with compromised immune systems, caused by underlying disease such as HIV, MTB and COVID-19, are at a greater risk. Antibacterial resistance is a global concern that demands the discovery of novel drugs. Natural products, used since ancient times to treat diseases, are the most successful source of new drug candidates with bioactivities including antibiotic, antifungal, anticancer, antiviral

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34

Lavelle, Kevin B. "Evaluation of Environmental Concentratorsfor Trace Actinide Measurements." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479816761576791.

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35

Kay, Rajiv Robert. "Actinide partition in humic colloidal ternary systems." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/actinide-partition-in-humic-colloidal-ternary-systems(c21f9744-46fb-477f-9ebc-af87d3e6fca0).html.

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The partition of radionuclides between solid and solution phase has been studied in humic/quartz sand ternary systems. Data have been recorded under ambient (air) and inert (O2 and CO2 free) atmospheres. For Eu (III) and Th (IV), the systems show simple ternary behaviour, with sorption decreasing (and mobility increasing) in the presence of humic, whilst for U (VI), the behaviour is more complex, with the humic enhancing sorption and reducing mobility. There is also evidence that the sorbed humic has an enhanced affinity for the uranyl, which is probably due to fractionation of the humic. Furt

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Wells, Jordann Ashley Logan Slovenne Denis. "Bimetallic actinide complexes for small molecule activation." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31167.

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The work described in this thesis concerns the synthesis of actinide complexes and their reactivity towards small unsaturated molecules. Complexes bearing tetraphenoxide, borohydride and boroxide ligands have been evaluated. Additionally, work towards the synthesis of heterobimetallic uranium transition metal complexes and their applications in catalysis is discussed. Chapter one reviews important organoactinide complexes reported in the literature which effect chemical transformations on small unsaturated substrates. Actinide complexes supported by aryloxide or borohydride ligands are reviewe

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37

Graham, Margaret C. "An investigation of actinide interactions with humic substances." Thesis, University of Glasgow, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360263.

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38

Nicoll, Steven. "Simulation studies of transition metal and actinide oxides." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308937.

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39

Sizer, Calvin Gregory. "Minor actinide waste disposal in deep geological boreholes." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41595.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.<br>Includes bibliographical references (leaves 63-65).<br>The purpose of this investigation was to evaluate a waste canister design suitable for the disposal of vitrified minor actinide waste in deep geological boreholes using conventional oil/gas/geothermal drilling technology. The nature of minor actinide waste was considered, paying particular attention to nuclides whose decay energy and half lives were of relative significance to the minor actinide waste as a whole. Thermal Analysis was pe

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Ingram, K. I. M. "Computational studies of molecular actinide and lanthanide complexes." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1444746/.

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This thesis reports computational DFT studies of three families of complexes (see below). Before presenting the results from these studies, the first chapter introduces the lanthanides and actinides and investigates their similarities and differences through a discussion of selected compounds of each of the series of metals. The second chapter introduces the electronic structure methods that were used in this research and mentions some of the relevant computational utilities. Chapter 3 discusses DFT studies of mixed water/hydroxide uranyl systems, U02(H20)a-:r- OH)x (2-x)+ for x = 0 -> 5 with

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Stuber, Wanda. "Direct monitoring of speciation for minor actinide separations." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:afbc10e6-9c8e-477d-90ab-c939776b625d.

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One of the major challenges in the development of future generations of nuclear reprocessing procedures is the separation of the minor actinides from the chemically similar trivalent lanthanide ions. In this thesis, the potential of two purely N-donor ligands for minor actinide separations is evaluated and behaviour in aqueous and extraction conditions investigated. Of two chosen ligands, 12N4Py4 and 9N3Py3, only the larger 12N4Py4 was found to be able to complex lanthanide ions; however, both bind readily to divalent calcium ions. In comparison to earlier published properties of Ln(III)- 12N4

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McGregor, Alistair. "Studies on the cytoskeletal protein α-actinin". Thesis, University of Leicester, 1992. http://hdl.handle.net/2381/35108.

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The interaction between the cytoskeletal proteins α-actinin and vinculin is considered to be fundamental to the link between actin microfilaments and the cytoplasmic face of integral membrane proteins that support cell adhesion. Evidence is provided here for an interaction between α-actinin and vinculin. Electron microscopy of negatively stained samples was used to directly visualise α-actinin/vinculin complexes. The micrographs showed that an α-actinin dimer could bind two vinculin molecules, one at each end of the α-actinin rod. Low speed equilibrium centrifugation demonstrated that the two

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Berg, Isak. "Analysis of α-actinin in Phytophthora infestans". Thesis, Umeå universitet, Kemiska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-150537.

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Teixeira, Marcelo Costa. "Infrerências moleculares sobre Passiflora Actinia Hook.(Passifloreaceae)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/131690.

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Passiflora actinia Hook. (Passifloraceae) é uma liana típica da Floresta Atlântica, que cresce geralmente no interior ou eventualmente na borda de florestas até seus ramos atingirem a parte mais alta e exposta à luz do dossel. A espécie possui uma ampla distribuição, desde a encosta Atlântica até a borda oriental do Planalto Brasileiro, não avançando muito em direção a oeste. A Floresta Atlântica está entre os biomas mais ricos em biodiversidade do mundo, especialmente em termos de endemismos. Devido a grande utilização de seus recursos e ao desmatamento para cultivo agrícola, pastoril e ocupa

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Le, Gurun Gwenaelle. "The application of colloidal photocatalysis in actinide photoredox chemistry." Thesis, University of Central Lancashire, 2003. http://clok.uclan.ac.uk/20090/.

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Colloidal semiconductor particles may act as efficient photocatalysts for a range of environmentally usellil reactions such as pollution abatement and nitrogen fixation. The primary step in these reactions is the absorption of ultra-band gap energy photons by the particles, which generates electron-hole (eB,htB) pairs within the semiconductor lattice. The valence band holes/conduction band electrons may react with oxidisable/reducible species in solution or particle lattice sites. Photocatalytic treatment of metal ion species by such particles has a number of important commercial applications

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Thompson, Gary S. "Studies of some actinide ions with polyhydroxy carboxylic acids." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385733.

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Rogers, Brendan James. "Arrangement and structure of α-actinins in striated muscle". Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/22905/.

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The smallest contractile unit within striated muscle cells are called sarcomeres. The boundary regions between sarcomeres are called Z-discs, which contain over 30 different proteins, organised within a narrow ~100 nm wide structure. Standard fluorescence microscopy approaches do not reveal the arrangement of Z-disc proteins, as the width of the Z-disc is below the resolution limit (~250 nm). The arrangement of the actin filaments and the cross-linking proteins α-actinin in the Z-discs are well characterised by electron microscopy (EM) studies, however other Z-disc proteins are not. With the d

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Du, Toit Erasmus Johannes. "Cluster model analysis of exotic decay in actinide nuclei." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95812.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The binary cluster model is used to investigate the properties of exotic structures and decays in various nuclei. A simple method is described to choose the possible clusters forming within the nucleus, by assuming the nucleus consists of a mixture of up to four different core-cluster pairs. A phenomenological potential is then used, with optimized parameters, to describe the even-even 222-232Th nuclei within the binary cluster model, by calculating exotic decay half-lives, reduced electromagnetic transition probabilities,

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Vinogradoff, Susan I. "An investigation of soil actinide-humic interactions using electrophoresis." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/14611.

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This study focused on the associations of U and Pu with humic substances and the implications for migration in deciduous broadleaf and coniferous forest soils. Humic substances were isolated from soil samples by (i) solvent extraction (0.045 M Tris-borate and 0.1 N NaOH) and (ii) novel gel electrophoretic extraction (pH 8.5; 0.045 M Tris-borate as running buffer). Gel electrophoresis was also used to extract humic substances from soil that had been 'pre-equilibrated' with a solution containing <sup>236</sup>U or <sup>242</sup>Pu (pH 4.2). The relative concentrations of humic substances in the

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Toral, Rizo Victor Hugo 1977. "Estudo clinicopatologico e imunoistoquimico de prurigo actinico de labio." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288363.

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Orientador: Oslei Paes de Almeida<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-14T03:19:43Z (GMT). No. of bitstreams: 1 ToralRizo_VictorHugo_M.pdf: 5977803 bytes, checksum: e23d73a627c912289b1e0630bf6ccfff (MD5) Previous issue date: 2009<br>Resumo: O prurigo actínico (PA) é uma fotodermatose familiar específica que afeta principalmente os mestiços, fruto da miscigenação entre índios e europeus, que habitam vários países da América do Norte, Central e do Sul. Pode manifestar-se em qualquer idade, n

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