Дисертації з теми "Selenone"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Selenone".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Alves, Leticia Rodrigues. "Biochemical and structural alterations induced by selenium under cadmium stress in tomato plants /." Jaboticabal, 2019. http://hdl.handle.net/11449/183154.
Повний текст джерелаResumo: As plantas estão expostas a adversidades no ambiente que as circundam, como a contaminação por cádmio (Cd). Este metal pesado tem aumentado na atmosfera devido a atividades humanas. As plantas podem absorver o Cd, causando sérias alterações estruturais, fisiológicas e bioquímicas. As plantas desenvolveram sistemas de defesa complexos, incluindo mecanismos não enzimáticos e enzimáticos para evitar uma cascata de oxidação descontrolada causada pelo estresse oxidativo. Alguns elementos, como o selênio (Se), se utilizados em concentração adequadas, podem induzir uma melhora no sistema antioxidante, no crescimento e nos atributos fotossintéticos. Ainda é pouco conhecido o papel do Se nas respostas das plantas ao estresse. O objetivo deste trabalho foi obter novas informações sobre o papel do selenato e selenito no sistema de desintoxicação das plantas, incluindo a avaliação da nutrição mineral, atividade de enzimas antioxidantes e conteúdo de compostos não enzimáticos, pigmentos, alterações estruturais e o papel do Se na modulação do etileno, com o uso de mutantes hormonais como ferramenta. Nossos dados indicam que o Se é uma estratégia interessante para melhorar o metabolismo da planta sob condições normais ou estressantes. O selênio pode induzir aumento da ação do metabolismo de defesa antioxidante, provavelmente devido a alterações na sinalização do etileno. Além disso, em condições normais, o Se induz alterações estruturais nas células, o que pode contribuir para o desenvolvim... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Cadmium (Cd) contamination is a worldwide concern and one of the most severe causes of abiotic stress in plants, triggering losses in crop production and contamination risks to human health. This heavy metal increased in atmosphere due to human activities. Plants can uptake Cd, causing serious changes in structural, physiological and biochemical processes. Plants developed a complex defence systems including non-enzymatic and enzymatic mechanism to avoid oxidative stress and prevent an uncontrolled oxidation cascade. Some elements, such as selenium (Se), if used in adequate concentration, may induce an improvement in antioxidant system, growth and photosynthetic attributes. It is still unknown the mechanisms of Se in stress responses. The aim of this work was get new insights about the role of selenate and selenite-mediated detoxification strategies, including the evaluation of mineral nutrition, the activity of antioxidant enzymes and non enzymatic compounds, pigments, structural alterations and the role of Se in modulate ethylene, with the use of hormonal mutants as a tool. Our data indicates that Se is an interesting strategy to improve plant metabolism under normal or Cd stressful-condition. Selenium may induce enhancement in antioxidant defence metabolism, probably due to alterations in ethylene signalling. Moreover, under normal condition Se induce structural alterations in cells, which may contribute to plant development. Thus, the information available in this work is... (Complete abstract click electronic access below)
Doutor
Wong, Donald Chun Kit. "Toxic effects of selenite and selenate on marine microalgae : a physiological and ultrastructural study." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29341.
Повний текст джерелаScience, Faculty of
Botany, Department of
Graduate
Barboza, Eliza [UNESP]. "Biofortificação agronômica com selênio em cultivares de repolho." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154224.
Повний текст джерелаApproved for entry into archive by Alexandra Maria Donadon Lusser Segali null (alexmar@fcav.unesp.br) on 2018-06-12T16:57:44Z (GMT) No. of bitstreams: 1 barboza_e_dr_jabo.pdf: 1545927 bytes, checksum: ac8fd976ca18df84595a993ec2a3e701 (MD5)
Made available in DSpace on 2018-06-12T16:57:44Z (GMT). No. of bitstreams: 1 barboza_e_dr_jabo.pdf: 1545927 bytes, checksum: ac8fd976ca18df84595a993ec2a3e701 (MD5) Previous issue date: 2018-04-13
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo deste trabalho foi avaliar concentrações de selênio (selenato e selenito de sódio) no crescimento, produção e biofortificação de duas cultivares de repolho. Para isso foram realizados dois experimentos em casa de vegetação, em sistema hidropônico, no período de julho a novembro de 2014, na UNESP, campus Jaboticabal-SP. Os experimentos diferiram conforme a fonte de selênio (Se) utilizada (selenato e selenito de sódio). Em ambos os experimentos, avaliaram-se dois fatores, sendo: duas cultivares de repolho (‘Fênix’ e 'Red Dinasty’) e cinco concentrações de Se (0, 5, 15, 30 e 60 µmol L-1) na solução nutritiva. O delineamento experimental utilizado foi o de blocos casualizados, com esquema fatorial 2 x 5 e quatro repetições. As variáveis analisadas foram o teor e acúmulo de Se na raiz e cabeça de repolho, área, diâmetro, comprimento e densidade de raiz, produtividade de repolho, massa seca de raiz, caule e cabeça de repolho e o teor e acúmulo de nitrogênio, fósforo e enxofre na cabeça de repolho. As fontes selenato e selenito promoveram o crescimento das raízes de repolho devido aos aumentos verificados em área, diâmetro, comprimento e densidade de raiz, em baixas concentrações de Se aplicadas. O aumento da produção de massa seca de raiz provavelmente foi devido o maior crescimento da raiz, que foi influenciado pelo fornecimento de Se. A massa seca do caule foi diferente apenas entre as cultivares de repolho com aplicação de selenato ou selenito. O teor de nitrogênio apresentou diferenças apenas entre as cultivares quando utilizada a fonte selenito. Ambas as fontes de Se também proporcionaram aumentos na absorção de fósforo e enxofre quando baixas concentrações de Se foram fornecidas. Observou-se que a aplicação de até 16,77 e 7,54 µmol L-1 de Se com as fontes selenato e selenito, respectivamente, proporcionaram os maiores incrementos na produtividade do repolho, e mesmo com a redução da produtividade com concentrações acima destas, os valores foram maiores que o tratamento controle. Isso indica que o Se foi benéfico ao repolho, pois não reduziu a sua produção. Verificou-se que a biofortificação foi eficiente para ambas as cultivares de repolho, que absorveram e acumularam Se na cabeça de repolho em função do incremento de Se, tanto com selenato como selenito.
The objective of this research was to evaluate concentrations of selenium (sodium selenate and selenite) in the growth, production and biofortification of two cabbage cultivars. Two experiments were carried out in greenhouse under hydroponic system, from July to November, 2014, at UNESP, Jaboticabal-SP campus. The experiments differed according to the source of selenium (Se) used (sodium selenate and selenite). In both experiments two factors were evaluated: two cabbage cultivars ('Fênix' and 'Red Dinasty') and five concentrations of Se (0, 5, 15, 30 and 60 μmol L-1) in the nutrient solution. The experimental was a randomized block design, with 2 x 5 factorial and four replications. The variables analyzed were the content and accumulation of Se in the root and shoot cabbage, evaluating area, diameter, length, density and dry mass in the root, cabbage yield, stem and cabbage head, and the content accumulation of nitrogen, phosphorus and sulfur in the cabbage shoot. Selenate and selenite sources promoted the growth of cabbage roots due to increases in area, diameter, length and root density at low concentrations of Se applied. The increase in root dry mass production was probably due to higher root growth, which was influenced by the supply of Se. The dry mass of the stem was different only between the cabbage cultivars with application of selenate or selenite. The nitrogen content presented differences only among the cultivars when the selenite source was used. Both S sources also provided increases in phosphorus and sulfur absorption when low concentrations of if were provided. It was observed that the application of up to 16,77 and 7,54 μmol L-1 of Se with selenate and selenite sources, respectively, provided the greatest increases in cabbage yield, and even with the reduction of productivity with concentrations above these, the values were higher than the control treatment. These indicate that the Se was beneficial to the cabbage, since it did not reduce its production. It was verified that biofortification was efficient for both cabbage cultivars, which absorbed and accumulated Se in the cabbage head as a function of the increase of Se, with both selenate and selenite.
Tan, Thatt Yang Timothy School of Chemical Engineering & 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.
Повний текст джерелаFerreira, Raphael Leone da Cruz [UNESP]. "Biofortificação e toxicidade de selênio na cultura da alface em solução nutritiva." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144363.
Повний текст джерелаApproved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-10-17T13:33:25Z (GMT) No. of bitstreams: 1 ferreira_rlc_me_jabo.pdf: 1223687 bytes, checksum: 7eb478241afa939e0b2a76387a523f55 (MD5)
Made available in DSpace on 2016-10-17T13:33:25Z (GMT). No. of bitstreams: 1 ferreira_rlc_me_jabo.pdf: 1223687 bytes, checksum: 7eb478241afa939e0b2a76387a523f55 (MD5) Previous issue date: 2016-09-08
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
As informações sobre fontes de selênio (Se) em alface são incipientes na literatura, sobretudo, com relação ao limite entre biofortificação e toxicidade. Assim, o objetivo deste estudo foi determinar níveis críticos de Se na solução nutritiva e foliar, e a melhor fonte que aumente a biofortificação da alface hidropônica sem causar toxicidade. O delineamento experimental utilizado foi inteiramente casualizado representado por duas fontes de selênio, selenito de sódio (Na2SeO3) e selenato de sódio (Na2SeO4), dez concentrações de selênio (0; 2; 4; 6; 8; 16; 32; 64; 96; 128 μM) com quatro repetições por tratamento, totalizando 80 unidades experimentais. As concentrações adequadas estão entre 5,6 e 16 μM de selênio na forma selenato em solução nutritiva e teores foliares adequados de 10,2 a 41,8 mg kg-1 de selênio.
Information on sources of selenium (Se) in lettuce are scarce in the literature, especially with respect to the boundary between Biofortification and toxicity. The objective of this study was to determine critical levels of Se in the nutrient solution and leaf and the best source to increase biofortification of hydroponic lettuce without causing toxicity. The experimental design was completely randomized represented by two sources of selenium, sodium selenite (Na2SeO3) and sodium selenate (Na2SeO4) ten selenium concentrations (0. 2. 4. 6. 8. 16. 32. 64. 96. 128 M) with four replicates per treatment, totaling 80 experimental units. The concentrations are between 5.6 and 16 M selenium selenate form the nutrient solution and appropriate foliar 10.2 to 41.8 mg kg-1 of selenium.
CNPq: 132361/20159
Finzer, Brant M. "Detection of Oxyanion Adsorption at the Silica-Aqueous Interface using Total Internal Reflection (TIR)-Raman Spectroscopy." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417521135.
Повний текст джерелаKing, Ellen Anne. "Structure and Relaxation in Germanium Selenide and Arsenic Selenide Glasses." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202735.
Повний текст джерелаCooper, 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.
Повний текст джерелаStewart, Helen. "Studies into the growth and doping of zinc selenide and zinc cadmium selenide." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/734.
Повний текст джерелаBarsova, Zoia. "Właściwości fizykochemiczne spinelu ZnCr₂Se₄ domieszkowanego wybranymi pierwiastkami d- i f-elektronowymi." Doctoral thesis, Katowice : Uniwersytet Śląski, 2020. http://hdl.handle.net/20.500.12128/16785.
Повний текст джерелаKamada, Rui. "Copper(indium,gallium)selenide film formation from selenization of mixed metal/metal-selenide precursors." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 226 p, 2009. http://proquest.umi.com/pqdweb?did=1654501631&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаWaite, Paul. "Deep levels in zinc selenide." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/6773/.
Повний текст джерелаImai, Takeshi. "Studies on Mammalian Selenite Metabolism." Kyoto University, 2013. http://hdl.handle.net/2433/175070.
Повний текст джерела0048
新制・課程博士
博士(農学)
甲第17641号
農博第2003号
新制||農||1012(附属図書館)
学位論文||H25||N4762(農学部図書室)
30407
京都大学大学院農学研究科応用生命科学専攻
(主査)教授 栗原 達夫, 教授 阪井 康能, 教授 平竹 潤
学位規則第4条第1項該当
Roy, Santanu. "Spectroscopic study of defects in cadmium selenide quantum dots (QDS) and cadmium selenide nanorods (NRS)." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16118.
Повний текст джерелаDepartment of Chemistry
Viktor Chikan
Ever depleting sources of fossil fuel has triggered more research in the field of alternate sources of energy. Over the past few years, CdSe nanoparticles have emerged as a material with a great potential for optoelectronic applications because of its easy exciton generation and charge separation. Electronic properties of CdSe nanoparticles are highly dependent on their size, shape and electronic environment. The main focus of this research is to explore the effect of different electronic environments on various spectroscopic properties of CdSe nanoparticles and link this to solar cell performance. To attain that goal, CdSe quantum dots (QDs) and nanorods (NRs) have been synthesized and either doped with metal dopants or embedded in polymer matrices. Electronic properties of these nanocomposites have been studied using several spectroscopic techniques such as absorption, photoluminescence, time-resolved photoluminescence, confocal microscopy and wide field microscopy. Indium and tin are the two metal dopants that have been used in the past to study the effect of doping on conductivity of CdSe QDs. Based on the photoluminescence quenching experiments, photoluminescence of both indium and tin doped samples suggest that they behave as n-type semiconductors. A comparison between theoretical and experimental data suggests that energy levels of indium doped and tin doped QDs are 280 meV and 100 meV lower than that of the lowest level of conduction band respectively. CdSe nanorods embedded in two different polymer matrices have been investigated using wide field fluorescence microscopy and confocal microscopy. The data reveals significant enhancement in bandedge luminescence of NRs in the vicinity of a conjugated polymer such as P3HT. Photoactive charge transfer from polymers to the surface traps of NRs may account for the observed behavior. Further study shows anti-correlation between bandedge and trap state emission of CdSe NRs. A recombination model has been proposed to explain the results. The origin of traps is also investigated and plausible explanations are drawn from the acquired data.
Berestok, T. O., M. M. Ivashchenko, Nadiia Mykolaivna Opanasiuk, and Надежда Николаевна Опанасюк. "Optical investigation of zinc selenide films." Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/4075.
Повний текст джерелаWang, Zaiqi. "Lens calcium homeostasis and selenite cataract." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-05042006-164509/.
Повний текст джерелаVaranasi, Mohan R. "Geometries of small cadmium selenide (CdSe) clusters." Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1349770.
Повний текст джерелаDepartment of Physics and Astronomy
Sacra, Ann. "Stark spectroscopy of cadmium Selenide (CdSe) nanocrystallites." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/9892.
Повний текст джерелаSchriver, Maria C. "Electron transport in lead selenide nanocrystal arrays." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32911.
Повний текст джерелаIncludes bibliographical references (p. 49-50).
I have investigated electrical properties of arrays of lead selenide (PbSe) nanocrystals (NC's) of approximately 6nm diameter. The films become substantially more conducting when annealed at 400K, although no chemical changes of the capping layer occur at this low temperature. There is no evidence based on TEM images of annealed and unannealed films that the interparticle spacing changes at 400K. The dependence of the conductance on the voltage applied to a gate separated from the sample by 350nm of SiO2 was also measured. At 77K and 150K, a U-shaped curve is observed with a minimum in conductance near zero gate voltage, indicating that both electrons and holes are injected. At 294K, the conductance falls monotonically with increasing gate voltage, indicating injection of holes only. I calculate the electron and hole mobilities, [mu]e and [mu]h at 77K and 150K and find effective mobilities 10 orders of magnitude smaller than those of bulk PbSe at 77K.
by Maria C. Schriver.
S.B.
Leatherdale, Catherine A. (Catherine Anne) 1972. "Photophysics of cadmium selenide quantum dot solids." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8828.
Повний текст джерелаIncludes bibliographical references.
Semiconductor quantum dots or nanocrystals have size dependent optical and electronic properties that arise from quantum confinement. While the quantum size effect is reasonably well understood, the effect of abrupt interface between the nanocrystal and its dielectric environment is not. In this thesis we study how the dielectric environment affects the quantum dot electronic structure, the optical absorption ~ross-section, charge separation, and transport in cadmium selenide colloidal quantum dots. The electronic states and optical absorption cross-section are found to be less sensitive to changes in the dielectric environment than predicted from theory unless screening from the ligand shell is taken into account. The absolute absorption cross section is measured as a function of quantum dot size; excellent agreement with theory is obtained for absorption far above the band edge. Three-dimensional close packed solids of quantum dots are predicted to act as model artificial solids. Optical absorption measurements indicate that the electronic states of CdSe quantum dots separated by 11 angstroms or more are essentially uncoupled. Photoconductivity measurements suggest that photoexcited quantum confined excitons are ionized by the applied field with a rate that depends on both the size and surface passivation of the quantum dots. The charge generation efficiency decreases with increasing temperature as non-radiative and radiative recombination pathways increasingly compete with charge separation. A simple tunneling model for the initial charge separation step is presented that qualitatively reproduces both the size and surface dependence of the photoconductivity as a function of applied electric field. Finally, we report observations of amplified spontaneous emission from quantum dot solids. The stimulated emission is tunable with quantum dot size and does not sensitively depend upon surface passivation. These measurements demonstrate the feasibility of nanocrystal quantum dot lasers and amplifiers.
by Catherine A. Leatherdale.
Ph.D.
Nirmal, Manoj. "Photophysics of cadmium selenide (CdSe) semiconductor nanocrystals." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10715.
Повний текст джерелаNaval, Victoriano C. "Characterization of zinc selenide-based ultraviolet detectors." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FNaval.pdf.
Повний текст джерелаThesis Advisor(s): Karunasiri, Gamani. Second Reader: Smith, Craig. "December 2009." Description based on title screen as viewed on January 28, 2010. Author(s) subject terms: Zinc Selenide, photodetectors, ultraviolet, Schottky, responsivity, current-voltage, depletion region, bandgap, melanoma, dark current, forward biased, reverse biased. Includes bibliographical references (p. 39-40). Also available in print.
Espinosa, Ortiz Erika. "Bioreduction of selenite and tellurite by Phanerochaete chrysosporium." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1193/document.
Повний текст джерелаSelenium (Se) and tellurium (Te) are particular elements, they are part of the chalcogens (VI-A group of the periodic table) and share common properties. These metalloids are of commercial interest due to their physicochemical properties, and they have been used in a broad range of applications in advanced technologies. The water soluble oxyanions of these elements (i.e., selenite, selenate, tellurite and tellurate) exhibit high toxicities, thus their release in the environment is of great concern. Different physicochemical methods have been developed for the removal of these metalloids, mainly for selenium. However, these methods require specialized equipment, high costs and they are not ecofriendly. The biological treatment is a green alternative to remove Se and Te from polluted effluents. This remediation technology consists on the microbial reduction of Se and Te oxyanions in wastewater to their elemental forms (Se0 and Te0), which are less toxic, and when synthesized in the nano-size range, they can be of commercial value due to their enhanced properties. The use of fungi as potential Se- and Te-reducing organisms was demonstrated in this study. Response of the model white-rot fungus, Phanerochaete chrysosporium, to the presence of selenite and tellurite was evaluated, as well as their potential application in wastewater treatment and production of nanoparticles. The presence of Se and Te had a clear influence on the growth and morphology of the fungus. P. chrysosporium was found to be more sensitive to selenite. Synthesis of Se0 and Te0 nanoparticles entrapped in the fungal biomass was observed, as well as the formation of unique Se-Te nanocomposites when the fungus was cultivated concurrently in the presence of Se and Te. Potential use of fungal pellets for the removal of Se and Te from semi-acidic effluents (pH 4.5) was suggested. Moreover, the continuous removal of selenite in a fungal pelleted reactor was evaluated. The reactor showed to efficiently remove selenium at steady-state conditions (~70%), and it demonstrated to be flexible and adaptable to different operational conditions. The reactor operated efficiently over a period of 35 days. Good settleability of the fungal pellets facilitated the separation of the selenium from the treated effluent. The use of elemental selenium immobilized fungal pellets as novel biosorbent material was also explored. This hybrid sorbent was promising for the removal of zinc from semi-acidic effluents. The presence of selenium in the fungal biomass enhanced the sorption efficiency of zinc, compared to Se-free fungal pellets. Most of the research conducted in this study was focused on the use of fungal pellets. However, the response of the fungus to selenite in a different kind of growth was also evaluated. Microsensors and confocal imaging were used to evaluate the effects of selenium on fungal biofilms. Regardless of the kind of fungal growth, P. chrysosporium seems to follow a similar selenite reduction mechanism, leading to the formation of Se0. Architecture of the biofilm and oxygen activity were influenced by the presence of selenium
Rennie, J. H. S. "Photo-dissolution of silver in amorphous germanium selenide." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383872.
Повний текст джерелаBerry, Patrick A. "Versatile Chromium-Doped Zinc Selenide Infrared Laser Sources." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1271776256.
Повний текст джерелаMcDaniel, Sean A. "Seeded, Gain-switched Chromium Doped Zinc Selenide Amplifier." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1343760359.
Повний текст джерелаDacleu, Siewe Vanessa. "Molecular and structural bases of selenoprotein N dysfunction in diverse forms of congenital muscular dystrophies." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAJ127.
Повний текст джерелаSelenoproteins are proteins containing a selenocysteine residue (U) in their amino acid sequence. Twenty-five proteins constitute the human selenoproteome. Among them is Selenoprotein N or SelenoN; mutations in the SELENON gene can lead to a group of congenital dystrophies now designated as SELENON-related myopathies. SelenoN is a 72 kDa membrane and glycosylated protein of the endoplasmic reticulum. It handles in its amino acid sequence a redox motif SCUG like the one of thioredoxin reductases, and an EF-hand domain which is a calcium binding site. Recent studies showed the implication of SelenoN in muscle development and maintenance, and position its function at the crossroad between oxidative stress control and calcium homeostasis. However, its catalytic function remains elusive. The research project presented in this thesis concerns the crystallization, characterization and comparison of one bacterial and the zebrafish SelenoNs. Bioinformatics analyses revealed that the two proteins share 37% degree of identity and a common domain which corresponds to a thioredoxin fold of unknown function which includes the redox motif SCUG. From the biophysical characterization, both recombinant proteins are found to be naturally well-folded and enriched in α-helical domains. The bacterial SelenoN which handles an additional C-terminal thioredoxin domain is an extended monomer whereas zebrafish SelenoN is a compact dimer. Biochemical characterization indicated that Ca2+ binding mediates zSelenoN oligomerization. Initial crystals of the zSelenoN in its deglycosylated form were obtained. Bacterial SelenoN crystallization yielded crystals belonging to two different space groups with different cell parameters. An initial partial model covering the C-terminal thioredoxin domain of the bacterial SelenoN was obtained at 2.3Å. Together, these results lay a foundation for the structure-function studies of SelenoN. Conditions for recombinant bacterial and zebrafish SelenoNs expression, purification and crystallization were optimized and strategies for solving the structure are being proposed
Schmitz, Dieter. "Synthese, Charakterisierung und Bildungsprinzipien von sauren und neutralen Oxoselenaten(IV)- und Oxoselenat(IV)-Hydraten." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964249820.
Повний текст джерелаLowe, Elisabeth Clare. "Resolving electron transport in the selenate respiring bacterium Thauera selenatis." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/40333.
Повний текст джерелаHeath, Jennifer Theresa. "Electronic transitions in the bandgap of copper indium gallium diselenide polycrystalline thin films /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3072587.
Повний текст джерелаTypescript. Includes vita and abstract. Includes bibliographical references (leaves 143-148). Also available for download via the World Wide Web; free to University of Oregon users.
Rickman, Sarah. "Growth and characterization of molybdenum disulfide, molybdenum diselenide, and molybdenum(sulfide, selenide) formed between molybdenum and copper indium(sulfide, selenide) during growth." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.94 Mb., 85 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1435848.
Повний текст джерелаSperança, Adriane. "Síntese de Seleno-Isoxazóis e Seleno-Indóis via Reações de Ciclização Intramolecular mediadas por Cloreto Férrico." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/4241.
Повний текст джерелаThis work reports the synthesis of a series of 4-organoselenyl-isoxazoles (19 examples), prepared via FeCl3/diorganyl diselenides-promoted intramolecular cyclization of alkynone O-metyloximas. In general, the selenyl-isoxazoles were obtained, in 50 to 70% yield. In addition, an alternative method was developed to promote the intramolecular cyclization reaction of o-alkynyl-N,N-dimethyl-anilines, where FeCl3 and substituted diorganyl diselenides were employed as promoter agents to this process. Through this cyclization protocol a series of N-methyl-3-organoselenyl-indoles could be synthesized (20 examples), in yields varying from 36 to 81%, by using room temperature and ambient atmosphere. In order to evaluate the versatility of the obtained compounds as precursors to the synthesis of functionalized isoxazoles and indoles, the 3,5-diphenyl-4-(phenylselenyl)-isoxazole, N-methyl-2-phenyl-3-(phenylselenyl)-1H-indole and N,5-dimethyl-2-phenyl-3-(phenylselenyl)-1H-indole were submitted to PhSe-Lithium exchange reactions, and the corresponding organolithium intermediates, which were generated by treatment with nBuLi, could be trapped with different electrophiles, affording the functionalized isoxazoles (5 examples) and indoles (4 examples) in good yields (45-80%).
Este trabalho relata a síntese de uma série de 4-organoseleno-isoxazóis (19 exemplos), preparados a partir da reação de ciclização intramolecular de O-metiloximas alquinílicas promovidas por FeCl3 e diferentes disselenetos de diorganoíla. Em geral, os derivados de seleno-isoxazóis foram obtidos de maneira satisfatória, em rendimentos de 50 a 70%. Desenvolveu-se também, um método alternativo para promover a reação de ciclização intramolecular de o-alquinil-N,N-dimetil-anilinas, empregando-se FeCl3 e disselenetos de diorganoíla diferentemente substituídos, como agentes promotores da ciclização. Através deste protocolo de ciclização pode-se sintetizar uma série de N-metil-3-organosseleno-indóis (20 exemplos), em rendimentos que variaram de 36 a 81%, utilizando condições de reação brandas, uma vez que os experimentos foram realizados a temperatura e atmosfera ambiente. A fim de avaliar a versatilidade dos compostos obtidos, como precursores para a síntese de isoxazóis e indóis com diferentes funcionalizações, o 3,5-difenil-4-(fenilselenil)-isoxazol e o N-metil-2-fenil-3-(fenilselenil)-1H-indol e N,5-dimetil-2-fenil-3-(fenilselenil)-1H-indol, foram submetidos à reações de troca PhSe-lítio, e o intermediário litiado correspondente, formado a partir de uma reação utilizando n-BuLi, pôde ser capturado com diferentes eletrófilos, obtendo-se como produtos uma série de isoxazóis (5 exemplos) e indóis (4 exemplos) diferentemente funcionalizados em bons rendimentos (45-80%).
Colakoglu, Tahir. "The Growth And Characterization Of Galium Selenide Thin Films." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1085240/index.pdf.
Повний текст джерела101 - 3.4×
102 (&
#8486
-cm)-1, 1.2×
10-6 - 1.5×
10-6 (&
#8486
-cm)-1 and 5.9 &
#8211
20.9 (cm2/V.s) (for doped samples only), respectively. Due to the high resistivity of the undoped samples mobility measurements could not be performed. The dominant conduction mechanisms were determined to be thermionic emission in the high temperature region (250-400 K), tunneling in the range 160-250 K and between 100-150 K variable range hopping mechanism for the doped films. For the undoped films above 250 K thermionic emission was the dominant conduction mechanism. Space charge limited currents in parallel and perpendicular directions of the film surface showed two different localized energy levels with different concentrations for each case, namely, 99.8 meV with concentration 3.5×
1012 cm-3 and 418.3 meV with the concentration 2.2×
105 cm-3 for parallel direction and for perpendicular direction 58.3 meV with concentration 6.2×
1025 cm-3 and 486.1 meV with concentration 3.3×
1022 cm-3. Photocurrentillumination intensity dependences indicated that power exponent of illumination intensity with values n>
1 implied two recombination centers exist in studied samples.
Sih, Bryan Christian. "Gold and cadmium selenide (CdSe) nanoparticles capped with oligothiophenes." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31523.
Повний текст джерелаScience, Faculty of
Chemistry, Department of
Graduate
Philipp, Dean. "Structural and optical properties of small cadmium selenide nanocyrstallites." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38098.
Повний текст джерелаOduor, A. O. "Electronic transport properties in evaporated cadmium selenide thin films." Thesis, Keele University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388869.
Повний текст джерелаSapkota, Yub Raj. "PHYSICAL PROPERTIES OF TOPOLOGICAL INSULATOR: BISMUTH SELENIDE THIN FILMS." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2261.
Повний текст джерелаKim, Changsu. "Optical, laser spectroscopic, and electrical characterization of transition metal doped ZnSe and ZnS nano- and microcrystals." Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2009r/kim.pdf.
Повний текст джерелаTitle from PDF title page (viewed Feb. 3, 2010). Additional advisors: Renato Camata, Derrick Dean, Chris M. Lawson, Andrei Stanishevsky, Sergey Vyazovkin. Includes bibliographical references (p. 133-140).
Bhardwaj, R. K. "Oxidative deselenation and desulphurisation at pentacovalent phosphorus." Thesis, City University London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379125.
Повний текст джерелаWeber, 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.
Повний текст джерелаHuang, Donglin. "Heterogeneous reduction of selenite by zero valent iron-steel wool." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11233.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains ix, 106 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
Knight, Edward Joseph 1968. "Cryogenic refractive index of zinc selenide from 8-12 micrometers." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278265.
Повний текст джерелаAdamchak, Marsha Ann. "The action of selenite on ATP synthesis in rat lens." Thesis, Virginia Tech, 1986. http://hdl.handle.net/10919/45655.
Повний текст джерелаA subcutaneous injection of sodium selenite (30
umol/kg body weight) in 10â day old rats produced a
cataract within 72 hours. Lens opacification was
preceded by a 15% decrease in ATP content. Lens ATP did
not fully recover to control concentrations by 11 days
postâ injection. A moderate correlation existed between
lens weight and total ATP content in control lenses
Master of Science
Perera, Jayalath Pathirannehelage Dimuthu Nuwan. "Photocatalytic Properties of Zinc Selenide/Cadmium Sulfide Core-shell Nanoparticles." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1370994697.
Повний текст джерелаBeukes, Stewart Eva-Panduleni. "EPR studies of electron transfer in cadmium selenide sensitised titania." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=232399.
Повний текст джерелаKrügermann, Ina. "Oxo-Selenate (IV/IV) der Selten-Erd-Elemente und ihre Derivate." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966624343.
Повний текст джерелаGuzzo, Julie. "Characterization of Escherichia coli genes whose expression is affected by selenite." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0030/NQ64566.pdf.
Повний текст джерелаBoscher, Nicolas D. "Atmospheric pressure chemical vapour deposition of transition metal selenide thin films." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1444549/.
Повний текст джерелаVu, Nhan Trung. "Characterisation of cadmium selenide material for high speed photoconductive switching systems." Thesis, University of Brighton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310102.
Повний текст джерелаJehl, Zacharie. "Realization of ultrathin Copper Indium Gallium Di-selenide (CIGSe) solar cells." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112058/document.
Повний текст джерелаIn this thesis, we investigate on the possibility to realize ultrathin absorber Copper Indium Gallium Di-Selenide (CIGSe) solar cells, by reducing the CIGSe thickness from 2500 nm down to 100 nm, while conserving a high conversion efficiency.Using numerical modeling, we first study the evolution of the photovoltaic parameters when reducing the absorber thickness. A strong decrease of the efficiency of the solar cell is observed, mainly related to a reduced light absorption and carrier collection for thin and ultrathin CIGSe solar cells. Solutions to overcome these problems are proposed and the potential improvements are modeled; we show that front side (buffer layer, antireflection coating) and back side (reflective back contact, light scattering) engineering of an ultrathin device can potentially increase the conversion efficiency up to the level of a standard thick CIGSe solar cell.By using chemical bromine etching on a standard thick CIGSe layer, we realize solar cells with different absorber thicknesses and experimentally study the influence of the absorber thickness on the photovoltaic parameters of the devices. Experiments show a similar trends to that observed in numerical modeling.Front contact engineering on thin CIGSe solar cell is realized to increase the specific absorption in CIGSe, including alternative ZnS buffer, front ZnO:Al window texturation and anti-reflection coating. Substantial improvements are observed whatever the CIGSe thickness, with efficiencies higher that the default configuration.A back contact engineering at low temperature is realized by using an innovative approach combining chemical etching of the CIGSe and mechanical lift-off of the CIGSe from the original Molybdenum (Mo) substrate. New highly reflective materials previously incompatible with the standard solar cell process are used as back contact for thin and ultrathin CIGSe solar cells, and a comparative study between standard Mo back contact and alternative reflective Au back contact solar cells is performed. The Au back reflector significantly enhance the efficiency of solar cell with sub-micrometer absorbers compared to the standard Mo back reflector; an efficiency higher than 10 % on a 400 nm CIGSe is obtained with Au back contact (7.9% with standard Mo back contact). For further reduction of the absorber thickness down to 100-200 nm, numerical modeling show that a lambertian back reflector is needed to fully absorb the incident light in the CIGSe. An experimental proof of concept device with a CIGSe thickness of 200 nm and a lambertian back reflector is realized and characterized by reflection/transmission spectroscopy, and the experimental spectral response is determined by combining simulation and experimentally measured absorption. A short circuit current of 26 mA.cm-2 is determined with the lambertian back reflector, which is much higher than what is obtained for the same device with no reflector (15 mA.cm-2), and comparable to the short circuit current measured on a reference 2500 nm thick CIGSe solar cell (28 mA.cm-2). Lambertian back reflectors are therefore found to be the most effective way to enhance the efficiency of an ultrathin CIGSe solar cell up to the level of a reference thick CIGSe solar cell