Dissertations / Theses on the topic 'Selen'
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Hug, Marius. "Selen." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/20932.
Full textThe subject of this dissertation is a history of the chemical element selenium from the prehistory of the discovery of selenium around 1783 to the 1920s. Methodically, the work follows proposals from the Science and Technology Studies, not to focus on the human actors, but to ask in which way things as non-human beings also create a difference, which allows to question their pure objecthood and makes them actors of history. The aim of the work was to recontextualize the historical preconditions that made the different events in the life of the selenium possible in the first place. The work is based on a very broad source base. The period of investigation extends from the first publications in the expanded context of the prehistory of the discovery of selenium in 1783, the discovery of the light-sensitive properties of selenium by W. Smith in 1873 up to the 1920s, when the use of the selenium cell in various inventions around the topic of remote control and automation comes to a provisional end. The work presented here as »Selenium – A Biographeme« makes a change of perspective: The chemical element selenium is the protagonist of the investigation. The present work contributes its part to the media-historical analysis of the history of television. The focus is on developments in the field of technical image transmission at the beginning of the 20th century. But also the history of the discovery of selenium, as well as its use in the context of the laying of the transatlantic telegraph cable–to call up only two further historical nodes–must henceforth be viewed in a different light.
Schermer, Susanne. "Elektrochemische Hydriderzeugung als Probenzuführung zur Bestimmung von Selen mit der optischen Emissionsspektrometrie am mikrowelleninduzierten Plasma." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962720461.
Full textMatthiesen, Jörg. "Untersuchungen im System Eisen-Germanium-Selen und Reaktivität im System Kupfer-Selen." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964506424.
Full textZimmermann, Thomas, Steffen Albrecht, S. Hanke, and Gagern Georg von. "Selen in der Intensivmedizin." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-134145.
Full textSince selenium was discovered as an essential trace element being widely distributed, and since glutathione peroxidase is known as a selenoenzyme, associations with several severe diseases were established (Keshan disease, Kaschin-Beck syndrome). Despite these known selenium deficiency diseases a related human therapy is still not established so far. In veterinary medicine, however, substitution of selenium is already a standard therapy. Our laboratory investigates the role of selenium since 1990. This includes investigations about the effects of selenium in acute inflammatory diseases in intensive care, in the reperfusion phenomenon following vascular surgery, and in oncology. In acute pancreatitis and sepsis, adjuvant therapy using sodium selenite seems to have positive effects on the overall outcome of patients (a multicenter, double-blind, randomized trial on sepsis is being prepared). New findings concerning the influence of selenium on transcription factors in inflammatory processes will permit a scientifically sound interpretation of clinical results. With further investigations in molecular biology the trace element selenium will become, in the next decade, one of the most interesting topics in intensive care and oncology
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Zimmermann, Thomas, Steffen Albrecht, S. Hanke, and Gagern Georg von. "Selen in der Intensivmedizin." Karger, 2000. https://tud.qucosa.de/id/qucosa%3A27562.
Full textSince selenium was discovered as an essential trace element being widely distributed, and since glutathione peroxidase is known as a selenoenzyme, associations with several severe diseases were established (Keshan disease, Kaschin-Beck syndrome). Despite these known selenium deficiency diseases a related human therapy is still not established so far. In veterinary medicine, however, substitution of selenium is already a standard therapy. Our laboratory investigates the role of selenium since 1990. This includes investigations about the effects of selenium in acute inflammatory diseases in intensive care, in the reperfusion phenomenon following vascular surgery, and in oncology. In acute pancreatitis and sepsis, adjuvant therapy using sodium selenite seems to have positive effects on the overall outcome of patients (a multicenter, double-blind, randomized trial on sepsis is being prepared). New findings concerning the influence of selenium on transcription factors in inflammatory processes will permit a scientifically sound interpretation of clinical results. With further investigations in molecular biology the trace element selenium will become, in the next decade, one of the most interesting topics in intensive care and oncology.
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Borowska, Katarzyna (agronomia). "Selen w glebie i roślinach w warunkach zróżnicowanego nawożenia organicznego i mineralnego." Rozprawa habilitacyjna, Wydaw. Uczelniane Uniwersytetu Technologiczno-Przyrodniczego, 2010. http://dlibra.utp.edu.pl/Content/399.
Full textWeber, Frank. "Präparative Studien in den Mehrstoffsystemen Selten-Erd-Metall - Selen bzw. - Tellur und Sauerstoff." [S.l.] : Universität Stuttgart , Fakultät Chemie, 1999. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8287476.
Full textPietschmann, Nicole [Verfasser], Lutz [Akademischer Betreuer] Schomburg, Roland [Akademischer Betreuer] Lauster, and Juri [Akademischer Betreuer] Rappsilber. "Selen und Knochen? Selen und Knochen! / Nicole Pietschmann. Gutachter: Roland Lauster ; Lutz Schomburg ; Juri Rappsilber. Betreuer: Lutz Schomburg." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1065669577/34.
Full textPertermann, Eric. "Schnelle Dioden mit tiefen Donatoren aus Selen." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2016. https://monarch.qucosa.de/id/qucosa%3A20643.
Full textThe focus of the following work is the correlation between the field-stop design and the behaviour of high-voltage power diodes. The objective is to present a further improvement of the diode performance using a special field-stop, which optimizes the diode in relation to a soft switching behaviour and an increased robustness. The function of such a field-stop is investigated. Benefits are shown of materials for field-stops with deep impurities in the semiconductor material and of multiple stepped deep field-stop structures. Therefore a central role have silicon diodes with selenium in the field-stop layer. Measurements and simulations with the power device simulator Sentaurus TCAD are done and explain the named correlations. The deep level transient spectroscopy is used as method to analyse the required impurity parameters. Beside this method the evaluation is done by the introduced frequency resolved admittance spectroscopy.
Moriz, Manuela [Verfasser], and Jürgen [Akademischer Betreuer] Bardutzky. "Selen und die Prognose bei ischämischem Schlaganfall." Freiburg : Universität, 2021. http://d-nb.info/124014203X/34.
Full textPertermann, Eric. "Schnelle Dioden mit tiefen Donatoren aus Selen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-219603.
Full textThe focus of the following work is the correlation between the field-stop design and the behaviour of high-voltage power diodes. The objective is to present a further improvement of the diode performance using a special field-stop, which optimizes the diode in relation to a soft switching behaviour and an increased robustness. The function of such a field-stop is investigated. Benefits are shown of materials for field-stops with deep impurities in the semiconductor material and of multiple stepped deep field-stop structures. Therefore a central role have silicon diodes with selenium in the field-stop layer. Measurements and simulations with the power device simulator Sentaurus TCAD are done and explain the named correlations. The deep level transient spectroscopy is used as method to analyse the required impurity parameters. Beside this method the evaluation is done by the introduced frequency resolved admittance spectroscopy
Hug, Marius [Verfasser], Christian [Gutachter] Kassung, and Friedrich [Gutachter] Steinle. "Selen / Marius Hug ; Gutachter: Christian Kassung, Friedrich Steinle." Berlin : Humboldt-Universität zu Berlin, 2020. http://d-nb.info/1204922632/34.
Full textSkipalová, Klára. "Geochemie rizikových prvků v oblasti postižené těžbou a zpracováním polymetalických rud - Namibie, Afrika." Doctoral thesis, Česká zemědělská univerzita v Praze, 2015. http://www.nusl.cz/ntk/nusl-259678.
Full textGasnier, Barbara C. H. "Einfluß einer Selen-Substitution auf den Verlauf einer Autoimmunthyreoiditis." Diss., lmu, 2002. http://nbn-resolving.de/urn:nbn:de:bvb:19-7511.
Full textTremlová, Jana. "Celkové obsahy a speciace arsenu a selenu v rostlinách rostoucích na půdách s různými fyzikálně-chemickými vlastnostmi." Doctoral thesis, Česká zemědělská univerzita v Praze, 2016. http://www.nusl.cz/ntk/nusl-261402.
Full textWismach, Cathleen. "Chemische Modellierung von ungewöhnlichen Proteinreaktionen Schwefel-Iodierung und Selen-Nitrosierung /." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974473871.
Full textDehina, Nora-Aicha [Verfasser]. "Die Bedeutung von Selen bei Endokriner Orbitopathie / Nora-Aicha Dehina." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2014. http://d-nb.info/1052529941/34.
Full textOrtgies, Stefan. "Studien zur oxidativen Funktionalisierung von Alkenen mittels Selen-pi-Säure-Katalyse." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E569-F.
Full textGubler, Daniela. "Vergleichende Untersuchung verschiedener Formen der Vitamin E-Selen-Supplementierung beim Kleinwiederkäuer /." [S.l : s.n.], 1986. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textStowasser, Joachim. "Untersuchungen an Phosphor-Arsen-Schwefel-Selen-Verbindungen und am Phosphor-Schwefel-Phasendiagramm." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964507587.
Full textHög, Antonia [Verfasser]. "Der Einfluss von Selen und Geschlecht auf Knochenentwicklung und Knochenhomöostase / Antonia Hög." Berlin : Freie Universität Berlin, 2014. http://d-nb.info/1054328854/34.
Full textStolze, Karoline. "Synthese und Charakterisierung niedervalenter Actinoidphosphidtelluride und ternärer Selen-Halogenid-Komplexe des Iridiums." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-202233.
Full textRůnová, Karolína. "Příjem selenu organismem potkanů se spontánní hypertenzí (SHR)." Master's thesis, Česká zemědělská univerzita v Praze, 2017. http://www.nusl.cz/ntk/nusl-315904.
Full textSchöpfer, Jutta Eleonore. "Das Verhältnis von Cadmium und Selen in der Prostata unter Berücksichtigung des Rauchverhaltens." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-52445.
Full textZeiler, Eva. "Einfluss der Supplementation von Vitamin E und Selen auf die Eutergesundheit von Milchkühen." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-121968.
Full textSolak, Sevinç Selen [Verfasser]. "Charge transport in bulk heterojunctions with perylene diimide based acceptors / Selen Solak Sevinç." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1126759317/34.
Full textDzul, Erosa Mercy Sugey. "Entfernung von Selen- und Antimonspezies aus wässrigen Lösungen mit Hilfe schwach basischer Anionenaustauscher." [S.l. : s.n.], 2008. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000009272.
Full textLehr, Iris Angela. "Schilddrüsenfunktion unter Selen-Substitution bei Patienten mit koronarchirurgischen Eingriffen unter Einsatz der extrakorporalen Zirkulation." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962998222.
Full textPotsch, Sebastian [Verfasser], and T. [Akademischer Betreuer] Neumann. "Stabilität von Selen-dotiertem Pyrit unter variablen hydrochemischen Bedingungen / Sebastian Potsch ; Betreuer: T. Neumann." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1130246647/34.
Full textHöflich, Johanna [Verfasser]. "Die Bedeutung von Selen in der vegetarischen Ernährung und in der Muttermilch / Johanna Höflich." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2010. http://d-nb.info/1025087720/34.
Full textJemetio, Feudjio Jean Paul. "Ternary Rare-Earth Coinage Metal Arsenides LnTAs2, Sm2Cu3As3; Quaternary Arsenide Oxides Sm2CuAs3O and Selenides KGd2CuSe4, KLn2Cu3Se5, and K2Ln4Cu4Se9 (Ln = Y, La - Nd, Sm, Gd - Lu; T = Cu, Ag, Au): Syntheses, Crystal Structures and Physical Properties." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1095857535000-60371.
Full textAichler, Michaela. "Influence of selenium on pancreatic carcinogenesis and the role of the selenoproteins cytosolic and mitochondrial thioredoxin reductase in the pancreas." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:100-opus-3076.
Full textFreismuth, Alexandra. "Eine placebokontrollierte Doppelblindstudie zur Wirkung von Vitamin E und Selen auf die Muskulatur von Sportpferden." Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-32483.
Full textKutzer, Martin. "Oberflächenmodifikation von Si(001) mittels Se." Master's thesis, Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200501676.
Full textMühlhausen, Klaus. "Anti-depressives Potential der Selen- Supplementation in Verbindung mit der Gabe von Antioxidantien, Spurenelementen und Mineralstoffen." Master's thesis, Dresden International University, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-217265.
Full textLöwinger, Maria. "Sulforaphan und Selen : Einfluss auf Phase II Enzyme und Selenoproteine sowie deren Effekt auf die entzündungsvermittelte Dickdarmkanzerogenese." Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2011/5186/.
Full textSulforaphane (SFN), a versatile actor derived from broccoli or other brassicaceae, is proposed to be a dietary anticarcinogen. Together with an adequate selenium status, it has been associated with a decreased risk for developing certain forms of cancer. In our mouse model, we investigate the influence of SFN and Se on the expression and activity of selenoproteins and phase II enzymes as well as the effects on inflammation triggered colon carcinogenesis. SFN increased NQO1 activity and protein expression significantly in the ileum, in both, Se-deficiently and Se-adequately fed animals. TrxR activity was increased in Se-adequately compared to Se-deficiently fed mice, SFN positively affected TrxR activity only in the former ones. An increase of GPx2 protein expression by SFN was observed in the ileum of mice of both diets. GPx1 reacts sensitively on Se supply. GST was the only enzyme analyzed being significantly increased by SFN on activity level in the colon. All AOM/DSS treated animals showed an inflammation, which was attenuated by SFN within Se-adequacy. In contrast, Se-deficient animals showed a more severe inflammation. The administration of SFN therefore seemed to enhance this even more and to be not beneficial in this case. SFN inhibited colon carcinogenesis in Se-adequate mice when being administered together with AOM. To summarize, both, GPx2 and TrxR, require selenium in order to be synthesized. In contrast to TrxR, the SFN-mediated induction of GPx2, the highest ranking selenoprotein, does not depend on additional selenium supply. Whereas distinct effects by SFN were observed in the ileum, only GST was influenced by SFN in the colon. SFN seems to induce its own metabolism. In conclusion, SFN and Se attenuate inflammation and colon carcinogenesis, preferably by means of up-regulating the endogenous defense system and inhibiting the metabolic activation of AOM.
Börsig, Nicolas [Verfasser], and T. [Akademischer Betreuer] Neumann. "Immobilisierung gelöster Selen-Oxyanionen während der Bildung der Eisenoxide Hämatit und Magnetit / Nicolas Börsig ; Betreuer: T. Neumann." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1136021647/34.
Full textFischer, Sandra. "Effekte einer Selen- und Vitamin E-Supplementierung auf den peripartalen antioxidativen Stoffwechsel und die Morbidität bei Milchkühen." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-166660.
Full textZuck, Catrin Margarita [Verfasser], and Viktoria [Akademischer Betreuer] Bogner-Flatz. "Selen und Selenoprotein P - Beeinflussung der Entzündungsreaktion bei polytraumatisierten patienten / Catrin Margarita Zuck ; Betreuer: Viktoria Bogner-Flatz." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1187135666/34.
Full textBlasig, Sarah [Verfasser]. "Zur Bestimmung von Selen aus Trockenblut und zum Zusammenhang von Selenstatus und Wachstumsregulation bei Kindern / Sarah Blasig." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2016. http://d-nb.info/1102196886/34.
Full textKrätzschmar, Felix. "Entwicklung regio- und enantioselektiver Transformationen an Alkenen mittels λ3-Iodan-Reagenzien bzw. chiraler Selen-π-Säure-Katalysatoren." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1470-6.
Full textBartz, Torsten [Verfasser]. "Identifizierung von Spurenelementproteinen im gastrointestinalen Trakt der Ratte und Humanzelllinien unter Berücksichtigung des Selen-Mangels / Torsten Bartz." Berlin : Freie Universität Berlin, 2009. http://d-nb.info/102366481X/34.
Full textLari, Alberth. "Inter and intramolecular interactions between divalent selenium centers." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:16-opus-88336.
Full textSlavík, Jan. "Elektrochemické a matematické studium interakcí selenu s biologicky aktivními thioly." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219501.
Full textHovemann, Inken. "Einfluss von Mistelextrakt, Selen, Kavir-Protein und Ascorbinsäure auf die Genexpression angiogener Wachstumsfaktoren und das Sprossverhalten humaner Granulosazellen." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=978875222.
Full textWelling, Brigitte. "Langzeitsupplementation von Phenylketonurie-Patienten mit anorganischen oder organischen Selenverbindungen - Veränderungen des Selen- und Glutathionperoxidase-Status in verschiedenen Körperkompartimenten." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967349346.
Full textFischer, Alexandra. "Untersuchungen zum Einfluss von Selen und Vitamin E auf differentielle Genexpression, antioxidative Schutzmechanismen und Zellschädigungen bei der Ratte." Marburg : Görich und Weiershäuser, 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968475248.
Full textBirringer, Marc [Verfasser], Michael [Gutachter] Ristow, and Josef [Gutachter] Köhrle. "Struktur, Metabolismus und biologische Funktion von Vitamin E- und Selen-Derivaten / Marc Birringer ; Gutachter: Michael Ristow, Josef Köhrle." Jena : Friedrich-Schiller-Universität Jena, 2007. http://d-nb.info/1178252582/34.
Full textEndermann, Tobias [Verfasser]. "Die Selen-abhängige Tumorigenese im Mausmodell: Einfluss des Selenoprotein P-Genotyps und des COX2-Hemmers Sulindac / Tobias Endermann." Berlin : Freie Universität Berlin, 2013. http://d-nb.info/1045195022/34.
Full textŠnajdr, Vladimír. "Selen ve výživě dojnic v ekologickém chovu." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-430450.
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