Relevant bibliographies by topics / Selenone

Academic literature on the topic 'Selenone'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Selenone"

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Abdel-Hafez, Shams H., Ragaa A. Ahmed, Mohamed A. Abdel-Azim, and Khairy M. Hassan. "Selenium containing Heterocycles: Part 1. Synthesis of Some New Substituted Pyrido[3′,2′:4,5]selenolo[3,2-d]pyrimidines and Related Fused Tetracyclic Systems." Journal of Chemical Research 2007, no. 10 (October 2007): 580–84. http://dx.doi.org/10.3184/030823407x25506.

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New series of selenolo[2,3- b]pyridine, pyrido[3′,2′:4,5]selenolo[3,2- d]pyrimidine, 7,8-dihydro-2,4-dimethylpyrrolo [1,2- a]pyrido[3′,2′:4,5]selenolo[3,2- d]pyrimidin-10(6 H)-one and 7,9-dimethylpyrido[3′,2′:4,5]selenolo[3,2- d][1,2,4] triazolo[4,3- c]pyrimidine derivatives were synthesised from 3-cyano-4,6-dimethylpyridine-2(1 H)-selenone (1). Spectroscopic (IR, 1H, MS) of the newly synthesised compounds are reported.
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Korona-Głowniak, Izabela, Wojciech Nitek, Waldemar Tejchman, and Ewa Żesławska. "Influence of chlorine and methyl substituents and their position on the antimicrobial activities and crystal structures of 4-methyl-1,6-diphenylpyrimidine-2(1H)-selenone derivatives." Acta Crystallographica Section C Structural Chemistry 77, no. 10 (September 28, 2021): 649–58. http://dx.doi.org/10.1107/s205322962100975x.

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Derivatives of 4-methyl-1,6-diphenylpyrimidine-2(1H)-selenone show very strong antimicrobial activity. In order to extend the current knowledge about the features responsible for the biological activity, crystal structure analyses are presented for 4-methyl-1-(2-methylphenyl)-6-phenylpyrimidine-2(1H)-selenone (1), 4-methyl-1-(3-methylphenyl)-6-phenylpyrimidine-2(1H)-selenone (2), 4-methyl-1-(4-methylphenyl)-6-phenylpyrimidine-2(1H)-selenone (3) (all C18H16N2Se) and 1-(4-chlorophenyl)-4-methyl-6-phenylpyrimidine-2(1H)-selenone (4) (C17H13ClN2Se). Furthermore, the antibacterial and antifungal activities of these compounds were evaluated. All the presented derivatives crystallize in the space group P21/c with one molecule in the asymmetric unit. The molecular geometries differ slightly in the mutual orientation of the rings. The packing of molecules in the crystals is dominated by C—H...N and C—H...Se intermolecular interactions. Additionally, in the crystal structure of 4, C—H...Cl intermolecular interactions are observed. The introduction of a methyl or chlorine substituent improves the biological activity, while its position significantly affects biological activity only in case of the chlorine substituent.
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Sarret, Géraldine, Laure Avoscan, Marie Carrière, Richard Collins, Nicolas Geoffroy, Francine Carrot, Jacques Covès, and Barbara Gouget. "Chemical Forms of Selenium in the Metal-Resistant Bacterium Ralstonia metallidurans CH34 Exposed to Selenite and Selenate." Applied and Environmental Microbiology 71, no. 5 (May 2005): 2331–37. http://dx.doi.org/10.1128/aem.71.5.2331-2337.2005.

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ABSTRACT Ralstonia metallidurans CH34, a soil bacterium resistant to a variety of metals, is known to reduce selenite to intracellular granules of elemental selenium (Se0). We have studied the kinetics of selenite (SeIV) and selenate (SeVI) accumulation and used X-ray absorption spectroscopy to identify the accumulated form of selenate, as well as possible chemical intermediates during the transformation of these two oxyanions. When introduced during the lag phase, the presence of selenite increased the duration of this phase, as previously observed. Selenite introduction was followed by a period of slow uptake, during which the bacteria contained Se0 and alkyl selenide in equivalent proportions. This suggests that two reactions with similar kinetics take place: an assimilatory pathway leading to alkyl selenide and a slow detoxification pathway leading to Se0. Subsequently, selenite uptake strongly increased (up to 340 mg Se per g of proteins) and Se0 was the predominant transformation product, suggesting an activation of selenite transport and reduction systems after several hours of contact. Exposure to selenate did not induce an increase in the lag phase duration, and the bacteria accumulated approximately 25-fold less Se than when exposed to selenite. SeIV was detected as a transient species in the first 12 h after selenate introduction, Se0 also occurred as a minor species, and the major accumulated form was alkyl selenide. Thus, in the present experimental conditions, selenate mostly follows an assimilatory pathway and the reduction pathway is not activated upon selenate exposure. These results show that R. metallidurans CH34 may be suitable for the remediation of selenite-, but not selenate-, contaminated environments.
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Wazeer, Mohamed I. M., Anvarhusein A. Isab, and Ali El-Rayyes. "Solid state NMR study of 1,3imidazolidine-2-thione, 1,3-imidazolidine-2-selenone and some of their N-substituted derivatives." Spectroscopy 18, no. 1 (2004): 113–19. http://dx.doi.org/10.1155/2004/309130.

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Solid‒state NMR spectra were recorded for 1,3-imidazolidine-2-thione, 1,3-imidazolidine-2-selenone and some of their N-substituted derivatives. Spinning side-bands of thione and selenone carbons were analysed to yield chemical shift anisotropies for these carbons. The NMR spectrum of imidazolidine-2-thione (Imt) showed some evidence for the presence of thiol tautomer. Molecular computations were carried out for Imt and its N-methyl derivative to yield relative energies of various tautomers.
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Hoier, H., H. L. Carrell, J. P. Glusker, and C. P. Spears. "Structure of ethyl phenyl selenone." Acta Crystallographica Section C Crystal Structure Communications 49, no. 3 (March 15, 1993): 520–23. http://dx.doi.org/10.1107/s0108270192008230.

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Rostkowska, Hanna, Leszek Lapinski, Artem Khvorostov, and Maciej J. Nowak. "Proton transfer processes in selenourea: UV-induced selenone→selenol photoreaction and ground state selenol→selenone proton tunneling." Chemical Physics 298, no. 1-3 (March 2004): 223–32. http://dx.doi.org/10.1016/j.chemphys.2003.11.024.

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Altoum, Ali Osman S., Ali Alhoshani, Khalid Alhosaini, Muhammad Altaf, Saeed Ahmad, Saheed A. Popoola, Abdulaziz A. Al-Saadi, Adam A. Sulaiman, and Anvarhusein A. Isab. "Synthesis, characterization and in vitro cytotoxicity of platinum(II) complexes of selenones [Pt(selenone)2Cl2]." Journal of Coordination Chemistry 70, no. 6 (February 13, 2017): 1020–31. http://dx.doi.org/10.1080/00958972.2017.1287355.

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Anderson, Kim A., and Brandon Isaacs. "Determination of Selenium in Feeds, Premixes, Supplements, and Injectable Solutions by Hydride-Generated Inductively Coupled Plasma Atomic Emission Spectrometry." Journal of AOAC INTERNATIONAL 76, no. 4 (July 1, 1993): 910–13. http://dx.doi.org/10.1093/jaoac/76.4.910.

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Abstract A simple method is described for the determination of 0.01-30 000 μg selenium/g sample. Selenium is present in feed supplements, premixes, mineral mixes, and injectable solution as either selenite or selenate. High concentrations of other common minerals present in these supplements are tolerated by the method. The samples are initially digested by heating with nitric acid and then boiled in a mixture of sulfuric and perchloric acids to convert all selenium species to selenate. The selenate is reduced to selenite, Se (IV), with hydrochloric acid at 95°C. The selenite in turn is then reduced by acidic sodium borohydride to hydrogen selenide, which is measured by hydride-generated inductively coupled plasma atomic emission spectrometry at 196.026 nm. The instrument detection limit for this method is 0.0005 μg Se/g sample.
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HOIER, H., H. L. CARRELL, J. P. GLUSKER, and C. P. SPEARS. "ChemInform Abstract: Structure of Ethyl Phenyl Selenone." ChemInform 24, no. 27 (August 20, 2010): no. http://dx.doi.org/10.1002/chin.199327052.

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Tian, Fengshou, Yahong Chen, Xiaofang Wang, Peng Li, and Shiwei Lu. "Oxidative Carbonylation of Aromatic Amines with CO Catalyzed by 1,3-Dialkylimidazole-2-selenone in Ionic Liquids." Journal of Chemistry 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/210806.

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1,3-Dialkylimidazole-2-selenone as a novel substituted selenium heterocyclic catalyst was used to catalyze oxidative carbonylation of aromatic amines with carbon monoxide in the presence of air to symmetrical ureas in up to 97% yield in ionic liquids.
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Dissertations / Theses on the topic "Selenone"

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Alves, Leticia Rodrigues. "Biochemical and structural alterations induced by selenium under cadmium stress in tomato plants /." Jaboticabal, 2019. http://hdl.handle.net/11449/183154.

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Orientador: Priscila Lupino Gratão
Resumo: 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
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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.

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Seven species of marine phytoplankters assigned to different taxonomic divisions were tested for toxic responses to two different molecular species of selenium known to be prevalent in seawater, selenite and selenate. Selenate proved to be more toxic than selenite, although severe toxicity was only observed at high concentrations (10⁻² and 10⁻³ M) of both selenate and selenite. At these concentrations, growth was completely or severely inhibited in most species tested. In some of the species that remained viable, both the percentage of motile cells and their swimming speed were drastically reduced. Scanning electron microscopy revealed that, under these circumstances, Dunaliella tertiolecta cells possessed much shorter flagella compared to the controls, while those that became non-motile lacked flagella altogether. Despite these striking alterations in both growth and morphology, cells of Amphidinium carterae, Dunaliella tertiolecta and Pavlova lutheri showed, after prolonged exposures, signs of adaptation to high selenium concentrations. Lower concentrations of selenium were generally non-toxic and frequently even stimulatory to growth. These observations suggest that for meaningful inferences on selenium toxicity both the concentration range and the length of the studies must be considered and the potential for adaptation to high selenium concentrations taken into consideration. The main ultrastructural and physiological changes in cells of Dunaliella tertiolecta, Pavlova lutheri and Amphidinium carterae treated with selenite or selenate involved the cell coat, mitochondria, chloroplasts as well as the respiratory and photosynthetic rates. Other changes were observed in the nucleus, lipids, vacuoles, nitrogen and carbon contents, but these showed greater variability among the microalgae studied. The major alterations suggested that energy transducing systems were severely affected by selenium toxicity. These led to significant decreases or even elimination of storage products which were indicative of severe shortage in energy and produced major reductions in growth. These occurred later upon exposure to the toxicant and coincided with the loss of cell coat material, suggesting that the shedding of cell surface material might play a major role in the detoxification and adaptation of the microalgae to toxic concentrations of selenium.
Science, Faculty of
Botany, Department of
Graduate
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Barboza, Eliza [UNESP]. "Biofortificação agronômica com selênio em cultivares de repolho." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154224.

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

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The current work investigates the photocatalytic reduction of selenium (Se) ions, selenate Se(VI) and selenite Se(IV), from two perspectives: Se ion removal from water and wastewater and the formation of nano-Se compounds. Se ion pollution has become an environmental issue in recent years, and hence there is an urgent need for an efficient removal technique. In addition, there is increasing interest in the formation of nano-size semiconductors for niche applications. Since Se is a semiconductor, its formation onto the semiconductor TiO2 could lead to the discovery of new composite materials. The current study has successfully elucidated the mechanism of Se ions reduction by photocatalysis. Factors such as the simultaneous adsorption of the Se ions (the electron scavenger in this case) and a suitable organic compound (the hole scavenger), and the chemical properties of the hole scavenger were crucial for effective and efficient Se ions photoreduction. Optimum conditions in relation to pH, concentrations and types of hole scavenger were reported and discussed. It was also found that stoichiometric adsorption ratio of formate and selenate resulted to optimum photoreduction rate. A modified Langmuir-Hinshelwood kinetic model that considered the simultaneous adsorption of both solutes was derived. The current investigation has also seen the successful formation Se deposits of different morphologies onto the TiO2 particles. Discrete Se particles of various sizes in the nano-size range as well as a Se film were deposited onto the TiO2 particles under different initial experimental conditions. The Se-TiO2 composite semiconductor was explored for the removal of cadmium Cd2+ ions, which resulted in the formation of CdSe-TiO2 systems. The photoreduction of Se ions using silver-modified TiO2 showed the enhanced reduction of Se ions to Se2- in the form of H2Se gas. It is suggested that the H2Se gas generated from the current photoreduction process could be used as a safer and cheaper technique in the formation of Se-compounds such copper selenide, cadmium selenide and zinc selenide. All these compounds were widely used in optical and semiconducting devices.
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Ferreira, 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.

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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
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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.

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King, Ellen Anne. "Structure and Relaxation in Germanium Selenide and Arsenic Selenide Glasses." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202735.

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GeₓSe₍₁₋ₓ₎ and AsₓSe₍₁₋ₓ₎ glasses have found use in many technological applications due to their excellent rheological properties and their wide IR transparency window. However, the low glass transition temperatures of these glasses leads to large changes in their properties, due to structural relaxation, over the weeks and months subsequent to their fabrication. Thus, obtaining a more thorough understanding of structural relaxation and its relation to the structure, composition, and processing of these glasses is important in furthering their use. Structural investigations, using NMR and Raman spectroscopies, performed on the GeₓSe₍₁₋ₓ₎ family of glasses show that the structure of these glasses is composed of two distinct microdomains. One corresponds to a rigid GeSe₂-like domain and the other corresponds to a floppy Se domain. These results are compared to other existing structural models for GeₓSe₍₁₋ₓ₎ glasses. Enthalpy measurements on both GeSe₉ and GeSe₄ optical fibers which were aged up to five years demonstrate that both compositions undergo a large amount of enthalpy relaxation in this time period. Raman spectroscopy performed concurrently with enthalpy measurements on the same GeSe₉ and GeSe₄ fibers shows that one of the structural changes taking place within the glass network is the conversion of edgesharing to corner-sharing tetrahedra in the GeSe₂-like phase. Moreover, the rate at which this conversion takes place is shown to be similar to the rate of enthalpy relaxation, suggesting that this structural change is one of the main mechanisms for structural relaxation in GeₓSe₍₁₋ₓ₎ glasses. Implementation of the Tool-Narayanaswamy-Moynihan (TNM) model as a hybrid computer model allowing the prediction of the four relaxation parameters Δh*, log(A), x, and β via optimization of simulated and experimental data was accomplished. It was found that a multi-rate version of the TNM model, which obtains an average set of model parameters via optimization of multiple experimental thermal histories simultaneously, was able to predict relaxation parameters for AsₓSe₍₁₋ₓ₎ glasses within the 2.10 ≤ ≤ 2.50 compositional domain, where is the average bond coordination of the glass network as defined by the Phillips and Thorpe constraints model. Above = 2.50, however, the model fails, due to a bimodal distribution of relaxation times within the glass structure contrary to the TNM model assumption of a unimodal distribution of relaxation times, thus rendering the model inapplicable. Muti-rate modeling of the GeₓSe₍₁₋ₓ₎ family of glasses was also attempted, however the TNM model also fails for this family of glasses due to the inherently bimodal distribution of relaxation times which arises from their bimodal structure.
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Cooper, Matthew A. "Selenium mediated cyclizations and reactions of selenones /." Title page, contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phc7776.pdf.

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Stewart, 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.

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Barsova, 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.

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As part of this work, the synthesis of doped poly- and monocrystalline compounds based on ZnCr₂Se₄ was planned and carried out, and then their physicochemical characteristic was determined. The inspiration for the research consisted in its unusual physicochemical properties. This compound has a spinel structure and is a p-type semiconductor with a spiral magnetic structure. The d- and f-electron elements manganese, holmium and neodymium were chosen as admixtures, guided by different values of effective magnetic moment compared to chromium ions on III oxidation state. The synthesis of poly- and monocrystalline compounds was based on solid phase reactions (ceramic method for polycrystalline compounds and chemical vapour transport for growth of single crystals). X-ray methods (diffraction, SEM, XPS), magnetic measurements (SQUID, strong fields), electric measurements (four-point method), and thermal analysis (DSC/TG) were used to develop the characteristics of the compounds obtained. In the Zn₁₋ₓMnxCr₂Se₄ polycrystalline system, single-phase compounds in the x = 0.1÷0.5 range were obtained, which was confirmed by an X-ray study. The lattice and anion parameters increase linearly with an increase in the Mn2+ amount, which is consistent with the difference in the radii values between Zn2+ and Mn2+ ions. Magnetic measurements showed an antiferromagnetic ordering in the obtained compounds as well as a superexchange interaction between chromium and manganese ions. XPS studies confirmed the presence of manganese ions on the II oxidation state and chromium ions on the III oxidation state. Thermal analysis showed that the increase in the amount of Mn2+ ions affects the stability and resistance of doped compounds compared to pure ZnCr₂Se₄. In the ZnCr₂Se₄:Ho system, single crystals with well-formed walls and edges were obtained. The chemical composition of the obtained single crystals and their structural parameters were determined using an X-ray study. Based on these studies, it was found that holmium ions occupy octahedral positions, together with chromium ions, and the general formula for single crystals can be written as Zn[Cr₂₋ₓHoₓ]Se₄. The network parameters increase linearly with the increase in the holmium amount, which is consistent with the difference in the radii values between Cr³⁺ and Ho³⁺ ions. Magnetic measurements have shown that the obtained single crystals exhibit an antiferromagnetic order and a metamagnetic transition. A significant influence of holmium ions on short-range ferromagnetic interactions, effective magnetic moments, and exchange integrals for the first and second coordination zones was observed. Thermal analysis confirmed the thermal stability of the obtained single crystals to about 800°C. In the ZnCr₂Se₄:Nd system, good quality single crystals were obtained, which were examined using X-ray in order to determine their structure and chemical composition. Based on these studies, it was found that neodymium ions occupy tetrahedral positions, together with zinc ions, and the general formula for single crystals can be written as (Zn₁₋ₓNdₓ)Cr₂Se₄. The lattice parameters increase linearly with the increasing amount of neodymium, which is consistent with the difference in cation radii of Zn2+ and Ho³⁺ ions. Based on magnetic measurements, it was found that the obtained single crystals are antiferromagnetics and exhibit short-range ferromagnetic interactions. Measurements of electrical conductivity showed semiconductor properties and a metal-insulator transition for single crystals with a lower amount of Nd³⁺ ions, at TMI = 330 K for x = 0.08 and 360 K for x = 0.05. Thermal measurements confirmed the thermal stability of single crystals (Zn₁₋ₓNdₓ)Cr₂Se₄ to a temperature of about 700°C.
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Books on the topic "Selenone"

1

Selene. Bologna: CLUEB, 2004.

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Selenini snovi: Roman. Beograd: BIGZ--Klub čitalaca, 1990.

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Yeaton, Linda. Selene: Poems. Cambridge, MA: Anne Miniver Press, 2002.

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Littke, Lael. Searching for Selene. Salt Lake City, Utah: Deseret Book, 2003.

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ill, McCully Emily Arnold, ed. Selene goes home. New York: Atheneum, 1989.

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Truong, Yen Thi Hoang. Reduction of selenite under controlled conditions. Sudbury, Ont: Laurentian University, School of Graduate Studies, 2005.

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Ilaria, Cornia, ed. Bologna di selenite: Una pietra racconta. Bologna: Costa editore, 2002.

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Uchū Kōkū Kenkyū Kaihatsu Kikō. SELENE Purojekuto Chīmu. KAGUYA (SELENE) purojiekuto hōkoku. Chōfu-shi: Uchū Kōkū Kenkyū Kaihatsu Kikō, 2010.

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Selene of the spirits. Princeton, NJ: Ontario Review Press, 1998.

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J, Coutts T., Kazmerski Lawrence L, and Wagner S, eds. Copper indium diselenide for photovoltaic applications. Amsterdam: Elsevier, 1986.

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Book chapters on the topic "Selenone"

1

Krief, Alain, and László Hevesi. "Reactions Involving Hydrogen Selenide, Selenols and Related Compounds." In Organoselenium Chemistry I, 12–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73241-6_2.

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Zhang, Zhengqi, Jun Liu, and Sharon Rozovsky. "Preparation of Selenocysteine-Containing Forms of Human SELENOK and SELENOS." In Methods in Molecular Biology, 241–63. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7258-6_18.

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Waitkins, G. R., R. Shutt, Irvin W. Kinney, and James P. McReynolds. "Aluminum Selenide and Hydrogen Selenide." In Inorganic Syntheses, 183–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132333.ch55.

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Windisch, W., and M. Kirchgeßner. "Selenium True Absorption and Tissue Concentration of Rats at Dietary Selenite, Seleno Cysteine, and Seleno Methionine." In Trace Elements in Man and Animals 10, 173–74. New York, NY: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47466-2_44.

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Gooch, Jan W. "Cadmium Selenide." In Encyclopedic Dictionary of Polymers, 108. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1802.

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Farmer, Thomas. "Indium Selenide." In Structural Studies of Liquids and Glasses Using Aerodynamic Levitation, 99–110. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06575-5_7.

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Seppelt, Konrad, and Darryl D. Desmarteau. "Selenonyl Difluoride." In Inorganic Syntheses, 36–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132517.ch9.

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Nicpon, Philip, Devon W. Meek, Bruce M. Foxman, and F. A. Cotton. "Triphenylphosphine Selenide." In Inorganic Syntheses, 157–59. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132418.ch23.

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Adachi, Sadao. "Zinc Selenide (ZnSe)." In Optical Constants of Crystalline and Amorphous Semiconductors, 459–72. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-5247-5_35.

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Adachi, Sadao. "Mercury Selenide (HgSe)." In Optical Constants of Crystalline and Amorphous Semiconductors, 546–52. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-5247-5_42.

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Conference papers on the topic "Selenone"

1

Marini, Francesca, Marcello Tiecco, Lorenzo Testaferri, Ola Walczak, and Silvia Sternativo. "PHENYL VINYL SELENONE AS A USEFUL REAGENT FOR THE STEREOSELECTIVE FORMATION OF CYCLIC BETA-AMINOESTERS." In The 15th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2011. http://dx.doi.org/10.3390/ecsoc-15-00663.

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Pajic, Tanja, Natasa Todorovic, Dunja Stefanovic, Mihailo D. Rabasovic, Aleksandar Krmpot, and Miroslav Zivic. "THE INFLUENCE OF SELENITE ON FILLAMENTOUS FUNGI HYPHA MORPHOMETRY PARAMETERS." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.308p.

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Selenium salts have been known for long time to have a potential for both beneficial and harmful effects on living organisms. It is present in the environment, where it can be readily assimilated by plants and fungi, thus entering the food chain. We investigated the cell growth dynamics in the presence of selenite which is considered to have more toxic potential than selenate. The effects of selenite (1 mM) on the growth of fungi from the activated spores to the end of the exponential growth were measured on several hypha morphological parameters by microscopy in vivo. Phycomyces blaekesleneeanus was used as model filamentous fungus. The most striking effect of Se+4 treatment was inhibition of hypha growth, resulting in more than four times shorter hypha in Se+4 –treatment group than in the control (200 ± 50 µm, n = 50 vs 900 ± 100 µm, n = 40 respectively) at the end of exponential growth period under controlled conditions. The Se+4 effect was an inhibition and not a simple delay in growth, as hypha length did not change significantly from 27th to 30th hour of culture in Se+4-treatment group. Since the microscopy was performed on live cultured cells, undisturbed cytoplasmic streaming was observed, confirming that hyphae were alive at all time points measured. 30h old spore diameters were also significantly reduced by Se+4 treatment (p = 0.0365), while hypha diameters were not significantly altered.
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Schardt, C. R., J. H. Simmons, L. LeNeindre, P. Lucas, and J. Lucas. "Nonlinear Index of refraction of germanium selenide glass at 10.6 μm." In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.jsue.32.

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We report on the nonlinear index of refraction in germanium selenide glasses at the CO2 laser wavelength of 10.6 μm. This frequency is near the low frequency edge of the germanium selenide infrared window. The nonlinear index is measured by the z-scan technique probed with a CO2 laser. The measurements were done with the laser operating in both continuous and pulsed modes. Compositions of germanium selenide glasses varying from 2 to 40 at. % germanium are studied and the data is compared to the structure and infrared spectra of these glasses.
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Hopkins, Michael Adventure, Neal Kuperman, James Barnes, and Raj Solanki. "Magnetic Characterization of Cobalt Selenide and Nickel Selenide Thin Films." In 2018 IEEE 13th Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2018. http://dx.doi.org/10.1109/nmdc.2018.8605836.

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Frantz, Jesse A., Jason D. Myers, Robel Y. Bekele, Anthony Clabeau, Vinh Q. Nguyen, Collin C. McClain, Natalia Litchinitser, and Jasbinder S. Sanghera. "Arsenic selenide dielectric metasurfaces." In Optical Components and Materials XVI, edited by Michel J. Digonnet and Shibin Jiang. SPIE, 2019. http://dx.doi.org/10.1117/12.2507894.

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Bennett, Gary. "The Selenide Saga: A Contribution Toward a History of the Selenide Isotope Generator." In 14th International Energy Conversion Engineering Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4815.

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Hickey, Carolyn, M. Trahan-Verma, and D. M. DePoy. "Antimony Selenide in Multilayer Coatings." In Optical Interference Coatings. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/oic.2001.the4.

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WANG, Kaifeng, Alejandro Fernandez-Martinez, Bin MA, Laurent Charlet, Benoit MADE, Pierre Henocq, and Laura Simonelli. "Selenite interactions with iron sulfides." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6201.

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Seregina, I. I., and I. G. Makarskaya. "Photosynthetic activity of spring wheat depending on the conditions of water supply." In Растениеводство и луговодство. Тимирязевская сельскохозяйственная академия, 2020. http://dx.doi.org/10.26897/978-5-9675-1762-4-2020-120.

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Abstract:In model experiments in soil culture, the effect of different methods of treatment with sodium selenite on the photosynthetic activity of spring wheat variety Zlata was studied under extreme growing conditions. Under drought conditions, the inhibition of the growth of the photosynthetic surface of spring wheat plants was revealed. Under conditions of excessive water supply, a sharp decrease in the area of the assimilating surface of wheat plants was observed. The positive effect of sodium selenite solution on the photosynthetic activity of spring wheat plants was established with insufficient and excessive water supply to wheat plants.
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Malik, S. N., H. Ahmed, M. Shahid, N. Haider, M. A. Malik, and P. O'Brien. "Colloidal preparation of copper selenide and indium selenide nanoparticles by single source precursors approach." In 2013 10th International Bhurban Conference on Applied Sciences and Technology (IBCAST 2013). IEEE, 2013. http://dx.doi.org/10.1109/ibcast.2013.6512127.

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Reports on the topic "Selenone"

1

Rasmussen, Anya Marie. Pressure-induced phase transitions of indium selenide. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1469335.

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Doyle, Kevin, and Sudhir Trivedi. Dislocation Etching Solutions for Mercury Cadmium Selenide. Fort Belvoir, VA: Defense Technical Information Center, September 2014. http://dx.doi.org/10.21236/ada609573.

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Berry, Patrick A. Versatile Chromium-Doped Zinc Selenide Infrared Laser Sources. Fort Belvoir, VA: Defense Technical Information Center, May 2010. http://dx.doi.org/10.21236/ada526209.

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Munavalli, Shekar, David I. Rossman, Dennis K. Rohrbaugh, C. P. Ferguson, and C. Parker Ferguson. Synthesis of Bis-(Trifluoromethyl) Trisulfide and Bis- (Trifluoromethylthio) Selenide. Fort Belvoir, VA: Defense Technical Information Center, June 1992. http://dx.doi.org/10.21236/ada254143.

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Nakotte, Tom. Engineering of Lead Selenide Quantum Dot Based Devices and Core/Shell Heterostructures. Office of Scientific and Technical Information (OSTI), April 2020. http://dx.doi.org/10.2172/1614831.

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Harrison, W. T., G. D. Stucky, R. E. Morris, and A. K. Cheetham. The Synthesis and Crystal Structure of Aluminum Selenite Trihydrate, Al2(seO3)3.32O. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada251283.

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Katzman, Daniel B. Design and Optimization of Copper Indium Gallium Selenide Thin Film Solar Cells. Fort Belvoir, VA: Defense Technical Information Center, September 2015. http://dx.doi.org/10.21236/ad1009063.

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Afrin, Shakila. Investigation of Electronic and Optical Properties of 2-Dimensional Semiconductor Tin Selenide (SnSe) Thin Films. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6738.

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Balapanov, M. Kh, K. A. Kuterbekov, M. M. Kubenova, R. Kh Ishembetov, B. M. Akhmetgaliev, and R. A. Yakshibaev. Effect of lithium doping on electrophysical and diffusion proper-ties of nonstoichiometric superionic copper selenide Cu1.75Se. Phycal-Technical Society of Kazakhstan, December 2017. http://dx.doi.org/10.29317/ejpfm.2017010203.

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Roscoe, S. M., S. B. Green, and S. S. Gandhi. Uranium, Gold and Selenide minerals Locally Concentrated in Drift At "Twin Lakes" near Bathurst Inlet, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120628.

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