Bibliografías temáticas / Acide tellurique

Literatura académica sobre el tema "Acide tellurique"

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Publicado: 22 de junio de 2024

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Artículos de revistas sobre el tema "Acide tellurique":

1

Dicko, Adama Aguissa y Et Al. "Mélioïdose cutanée : A propos d’un cas au Mali". Revue Malienne d'Infectiologie et de Microbiologie 17, n.º 1 (30 de abril de 2022): 97–99. http://dx.doi.org/10.53597/remim.v17i1.2236.

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La mélioïdose est une zoonose bactérienne transmise par voie aérienne et cutanée, due à un bacille tellurique Burkholderia pseudomallei. C’est une infection sévère par ces complications viscérales. Elle est observée essentiellement en Asie du Sud-Est et au Nord de l’Australie. En Afrique et particulièrement au Mali, elle est rarement observée. Nous rapportons le cas d’un monsieur de 25 ans, malien, chauffeur mécanicien sans antécédents médico-chirurgicaux particuliers reçu en août 2021 pour des lésions papuleuses persistantes du visage survenues à la suite d’une longue panne de véhicule dans les broussailles de Kita une région du sud du Mali à pluviométrie élevée. A l’examen on notait un état général conservé, une fièvre à 38°C et un IMC à 22 Kg/m2. Au niveau cutané, on observait des lésions papulo-pustuleuses et nodulaires par endroits prédominant au visage et quelques-unes au dos. Le reste de l’examen clinique était normal. L’examen bactériologique du pus a mis en évidence la présence d’assez nombreuses colonies de Burkholderia pseudomallei qui étaient sensible à l’imipénème et intermédiaire à l’amoxicilline-acide clavulanique. Le reste du bilan était normal. Le patient a été traité par l’amoxicilline-acide clavulanique avec une disparition des lésions en 15 jours. La mélioïdose doit être toujours évoquée devant des lésions papulo-nodulaires et pustuleuses dans un contexte de séjour dans une zone humide.
2

Kiriyak, Ludmila. "The effect of thiazine dyes on polarographic determination of tellurium". Collection of Czechoslovak Chemical Communications 56, n.º 1 (1991): 216–22. http://dx.doi.org/10.1135/cccc19910216.

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The effect of thionine, azure I and methylene blue on the electroreduction of tellurium(IV) has been studied in the solutions of oxalic, tartaric and trihydroxyglutaric acids. It has been shown that the electrode process is complicated by adsorption of all components of the electrochemical reaction. This causes an increase of the tellurium analytical signal. The determinations is not hampered by great excesses of various elements. Optimal conditions were found according to which determinations were carried out of tellurium in binary mixtures Pb-Te, Cd-Te, Fe-Te, Bi-Te and of tellurium admixtures in bismuth of high purity, doped by tellurium.
3

Chen, Cen y Zhen Huang. "Tellurium-Modified Nucleosides, Nucleotides, and Nucleic Acids with Potential Applications". Molecules 27, n.º 23 (1 de diciembre de 2022): 8379. http://dx.doi.org/10.3390/molecules27238379.

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Tellurium was successfully incorporated into proteins and applied to protein structure determination through X-ray crystallography. However, studies on tellurium modification of DNA and RNA are limited. This review highlights the recent development of Te-modified nucleosides, nucleotides, and nucleic acids, and summarizes the main synthetic approaches for the preparation of 5-PhTe, 2′-MeTe, and 2′-PhTe modifications. Those modifications are compatible with solid-phase synthesis and stable during Te-oligonucleotide purification. Moreover, the ideal electronic and atomic properties of tellurium for generating clear isomorphous signals give Te-modified DNA and RNA great potential applications in 3D crystal structure determination through X-ray diffraction. STM study also shows that Te-modified DNA has strong topographic and current peaks, which immediately suggests potential applications in nucleic acid direct imaging, nanomaterials, molecular electronics, and diagnostics. Theoretical studies indicate the potential application of Te-modified nucleosides in cancer therapy.
4

Tremaroli, Valentina, Matthew L. Workentine, Aalim M. Weljie, Hans J. Vogel, Howard Ceri, Carlo Viti, Enrico Tatti et al. "Metabolomic Investigation of the Bacterial Response to a Metal Challenge". Applied and Environmental Microbiology 75, n.º 3 (1 de diciembre de 2008): 719–28. http://dx.doi.org/10.1128/aem.01771-08.

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ABSTRACT Pseudomonas pseudoalcaligenes KF707 is naturally resistant to the toxic metalloid tellurite, but the mechanisms of resistance are not known. In this study we report the isolation of a KF707 mutant (T5) with hyperresistance to tellurite. In order to characterize the bacterial response and the pathways leading to tolerance, we utilized Phenotype MicroArray technology (Biolog) and a metabolomic technique based on nuclear magnetic resonance spectroscopy. The physiological states of KF707 wild-type and T5 cells exposed to tellurite were also compared in terms of viability and reduced thiol content. Our analyses showed an extensive change in metabolism upon the addition of tellurite to KF707 cultures as well as different responses when the wild-type and T5 strains were compared. Even in the absence of tellurite, T5 cells displayed a “poised” physiological status, primed for tellurite exposure and characterized by altered intracellular levels of glutathione, branched-chain amino acids, and betaine, along with increased resistance to other toxic metals and metabolic inhibitors. We conclude that hyperresistance to tellurite in P. pseudoalcaligenes KF707 is correlated with the induction of the oxidative stress response, resistance to membrane perturbation, and reconfiguration of cellular metabolism.
5

Srivastava, Prem C., Furn F. Knapp y George W. Kabalka. "NEW RADIOHALOGENATED ALKENYL TELLURIUM FATTY ACIDS". Phosphorus and Sulfur and the Related Elements 38, n.º 1-2 (julio de 1988): 49–58. http://dx.doi.org/10.1080/03086648808079700.

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6

Silva, Marcio S. y Daniel Pietrobom. "Chiral discrimination of β-telluride carboxylic acids by NMR spectroscopy". New Journal of Chemistry 39, n.º 11 (2015): 8240–44. http://dx.doi.org/10.1039/c5nj01877c.

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7

Kudr, Jiri, Lukas Nejdl, Sylvie Skalickova, Michal Zurek, Vedran Milosavljevic, Renata Kensova, Branislav Ruttkay-Nedecky et al. "Use of nucleic acids anchor system to reveal apoferritin modification by cadmium telluride nanoparticles". Journal of Materials Chemistry B 3, n.º 10 (2015): 2109–18. http://dx.doi.org/10.1039/c4tb01336k.

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8

Ramadan, Shadia E., A. A. Razak, A. M. Ragab y M. El-Meleigy. "Incorporation of tellurium into amino acids and proteins in a tellurium-tolerant fungi". Biological Trace Element Research 20, n.º 3 (junio de 1989): 225–32. http://dx.doi.org/10.1007/bf02917437.

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9

Kut, D., M. Kut, M. Onysko y V. Lendel. "SYNTHESIS OF THIAZOLOQUINAZOLINARYLTELLURID". Scientific Bulletin of the Uzhhorod University. Series «Chemistry» 47, n.º 1 (23 de septiembre de 2022): 78–83. http://dx.doi.org/10.24144/2414-0260.2022.1.78-83.

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Symmetric and asymmetric chalcogenides of organic nature are a class of organometallic compounds that are widely used as intermediates in a number of organic reactions, as ligands in the chemistry of coordination compounds, they have a wide range of biological activity. Diaryl tellurides, which are important for the formation of new carbon-carbon bonds, have a special area in the chemistry of organotelluric compounds. The synthesis of new representatives of this class of tellurium-containing compounds is an urgent task. One of the main methods of obtaining of diaryl tellurides is the interaction of arylboronic acids with diarylditellurides in the presence of various metal-containing catalysts or microwave radiation. In this paper, we have considered the method of obtaining asymmetric tellurides by the reaction of reduction of sodium sulfite with salts of thiazoloquinazolinaryl dichlorotellurides without the usage of catalysts. It was found that the reaction of 2-((dichloro(4-methoxyphenyl)-4-tellanyl)methyl)-2,3-dihydro-5H-thiazolo[2,3-b]quinazolin-5-one hydrochloride with triple excess of sodium sulfite leads to the formation of 2-((4-methoxyphenyl)tellanyl)methyl)-2,3-dihydro-5H-thiazolo [2,3-b]quinazolin-5-one. It should be noted that the recovery does not break the bond Te-C. In the analysis of spectral data, the signals of the protons of the thiazole cycle and the exocyclic aryltelluric fragment undergo a strong field shift. Thus, as a result of the reduction reaction of 2-((dichloro(4-methoxyphenyl)-4-tellanyl)methyl)-2,3-dihydro-5H-thiazolo[2,3-b]quinazolin-5-one hydrochloride, a biologically promising and suitable for further functionalization telluride was received.
10

Dittmer, Donald C., Dmitry V. Avilov, Venkata Subbarao Kandula, Matthew T. Purzycki, Zachary J. Martens, Elliot B. Hohn y Matthew W. Bacler. "Tetramic acids and derivatives by telluride-triggered Dieckmann cyclizations". Arkivoc 2010, n.º 6 (9 de diciembre de 2009): 61–83. http://dx.doi.org/10.3998/ark.5550190.0011.608.

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Artículos de revistas

Tesis sobre el tema "Acide tellurique":

1

Ksila, Wafa. "Préparation, caractérisation et réactivité de catalyseurs xerogels et aerogels à base de zirconium, d’aluminium et de porosité contrôlée pour les réactions d’estérification et d’hydrogénation". Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR039.

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Les oxydes de zirconium et d’aluminium sont des matériaux de grande stabilité thermique dans des conditions différentes et ont une surface dotée de sites acido-basiques modulables. La modification de ces oxydes par un oxo-anion, par une fonction acide et/ou métallique leur donne plus de stabilité, inhibe le frittage et développe l’acidité de leur surface et par suite ils peuvent être utilisés dans plusieurs réactions catalytiques en tant que phase active ou support.Les travaux de cette thèse portent sur la synthèse, la caractérisation et la valorisation de deux types de catalyseurs xerogels et aerogels à base d’oxydes de zirconium et d’aluminium. Nous avons fait le choix d’utiliser l’acide tellurique comme modulateur de l’acidité des supports à base de zircone et d’alumine et d’associer le nickel à l’acide tellurique pour faire des phases de tellure de nickel sur ces supports permettant la réaction d’isomérisation.Dans un premier volet, des catalyseurs xerogels et aerogels à base de zircone et d’alumine dopées par l’acide tellurique ont été synthétisés par voie « sol-gel » puis caractérisés et valorisés dans la réaction d’estérification de l’acide acétique par l’alcool benzylique comme réaction modèle pour la synthèse de biodiesel. Une étude cinétique et mécanistique ainsi que la détermination des grandeurs thermodynamiques pour la réaction d’estérification ont été réalisées en présence du catalyseur ayant les meilleures performances catalytiques.Le second volet de cette thèse porte sur la synthèse des catalyseurs xerogels et aerogels à base de zircone et d’alumine dopées par l’acide tellurique et les nitrates de nickel en une seule étape, toujours synthétisés par voie « sol-gel ». Ces catalyseurs ont été caractérisés puis testés dans la réaction d’hydrogénation isomérisation du 1-hexene comme réaction modèle pour la reformulation d’essence. Nous montrerons que la présence de nickel dans la préparation empêche la formation d’une phase Zr-Te, caractérisée sur le support seul modifié par l’acide tellurique
Zirconium and aluminum oxides are materials of great thermal stability under different conditions and have a surface with modulable acid-base sites. The modification of these oxides by an oxo-anion, by an acid and / or metallic function gives them more stability, inhibits sintering and develops the acidity of their surface and consequently they can be used in several catalytic reactions as active phase or support.The work of this thesis focuses on the synthesis, characterization and upgrading of two types of xerogels and aerogels catalysts based on zirconium and aluminum oxides. Telluric acid was chosen as a modulator of the acidity of supports based on zirconia and alumina. Nickel was combined with telluric acid to make nickel tellurium phases on these supports, allowing the isomerization reaction.In a first part, xerogels and aerogels catalysts based on zirconia and alumina doped with telluric acid were synthesized by the “sol-gel” route then characterized and tested in the esterification reaction of acetic acid by benzyl alcohol as a model reaction for the synthesis of biodiesel. A kinetic and mechanistic study as well as the determination of the thermodynamic quantities for the esterification reaction were carried out in the presence of the catalyst having the best catalytic performance.The second part of this thesis focuses on the synthesis of zirconia and alumina-based xerogels and aerogels catalysts doped with telluric acid and nickel nitrates in one-pot, always synthesized by the "sol-gel" route. These catalysts were characterized and then tested in the isomerization hydrogenation reaction of 1-hexene as a model reaction for gasoline reformulation. We will show that the presence of nickel in the preparation prevents the formation of a Zr-Te phase, characterized on the support alone modified by telluric acid
2

Chau, Hei. "Synthesis and properties of tellurium-containing long chain fatty acid derivatives /". [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13554566.

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周晞 y Hei Chau. "Synthesis and properties of tellurium-containing long chain fatty acidderivatives". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31233478.

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4

Culshaw, Peter Norman. "Generation and reactivity of carbon, sulphur and tellurium centred free radicals". Thesis, University of St Andrews, 1991. http://hdl.handle.net/10023/14841.

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Using ESR dimer-radical equilibrium techniques the heat of formation, △Hf0, of the pentamethylcyclopentadienyl radical was determined as 7.4 kcal mol−1, and hence SEMeH was calculated to be 37.9 kcal mol−1. It was attempted to determine △Hf0 for the pentaethyl- and pentamethoxycarbonylcyclopentadienyl radicals, but this proved unsuccessful. From appearance energy measurements, △Hf0 (Pentadienyl) was determined to be 49.6 kcal mol−1 Using photoacoustic calorimetry, the C3-H bond dissociation energy of penta−1,4-diene and several 3-substituted pentadienes were determined; i.e. for penta−1,4-diene (DH° (C3-H) = 76.6±0.6 kcal mol−1), 3-methyl- penta−1,4-diene (DH°(C3-H) = 76.6±0.6 kcal mol−1) and 3-hydroxypenta−1,4-diene (DH°(C3-H) = 69.0±0.6 kcal mol−1). ESR exchange broadening methods were used to show that SEESR (3-methylpentadienyl) is virtually the same as that of the parent pentadienyl radical, (i.e. 25 kcal mol−1). The 3-hydroxypentadienyl, l-hydroxy-3-methylpentadienyl and l-trimethylsilyloxy-3-methylpentadienyl radicals were generated, but exchange broadening was not observed in the accessible temperature range. Sulphonate esters were examined as a potential source of free radicals. The reaction of simple alkyl alkanesulphonates with photochemically generated trimethyltin radicals in the cavity of an ESR spectrometer gave the corresponding alkanesulphonyl radicals. Good ESR spectra were obtained when sulphonyl radicals, generated from sulphonate esters, were used to form adduct radicals with alkenes of the type CH2=CHR where R is an electron releasing substituent, (R = OMe, OBun, SPh, SiME3). Delocalised radicals were generated from sulphonate esters which contained a terminal alkenyl or alkynyl substituent. For example, the reaction of allyl methanesulphonate with photochemically generated trimethyltin radicals in the cavity of an ESR spectrometer gave good spectra of the allyl radical. The pent-4-ene-1-sulphonyl radical was generated from the corresponding sulphonyl chloride using several different radical initiator systems (tri-n-butyltin hydride, triphenylsilane, hexa-n-butylditin, 9-trimethylstannyl-9,10-dihydroanthracene, copper (II) chloride and tris (triphenylphosphine) ruthenium (II) chloride). The radical was found to cyclise in a predominantly endo-fashion to give 3-chlorotetrahydrothiopyran-1,1-dioxide, the exact proportion of endo- and exo-products depending on the temperature. The hex-5-ene-1-sulphonyl radical was found to give thiepane-1,1- dioxide, also the product of endo-cyclisation. The inclusion of a bulky ring substituent forced the cyclohexenylethanesulphonyl radical to cyclise in the exo-mode to give 2-chloro-9-thiabicyclo[4.3.0]nonane-9,9-dioxide. Dialkyltellurides and dialkylditellurides gave the corresponding alkyl radical on photolysis in the cavity of an ESR spectrometer. For example, diallyltelluride gave good spectra of the allyl radical. Under thermolysis conditions, a nitrosodurene spin trap was employed to observe the trapped alkyl radicals. It is believed that certain of the trapped radicals were tellurium-centred species.
5

Sheng, Jia. "Synthesis, Structure and Function Studies of Selenium and Tellurium Derivatized Nucleic Acids". Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/chemistry_diss/30.

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Nucleic acids play important roles in living systems by storing and transferring genetic information and directing protein synthesis. Recently, it was found that nucleic acids can catalyze chemical and biochemical reactions similar to protein enzymes. In addition, they can also serve as drug targets for the treatment of deadly diseases such as AIDS and cancers. As a result, the 3D structure study of nucleic acids and proteinnucleic acids complexes by X-ray crystallography has become one of the most active research areas. However, the two intrinsic bottlenecks of macromolecule X-ray crystallography, including crystallization and phase determination, have significantly limited its application in study and discovery of the new structures and folds, as well as in exploration of the biological mechanisms. So far, the selenium derivatization (Se-Met) of proteins and multiple anomalous dispersion (MAD) or single anomalous dispersion (SAD) technology have revolutionized the protein crystallography field by providing a rational solution to solve the phase determination problem. Similarly, it’s important and urgent to develop a corresponding methodology for nucleic acid X-ray crystallography. The work presented here includes two general research directions: the selenium derivatized nucleic acids (SeNA) and tellurium derivatized nucleic acids (TeNA): 1) The SeNA strategy by site-specifically replacing oxygen with selenium at the 2’ and 4 positions of thymidine and uridine has been developed. We found that the selenium derivatization at both sites are relatively stable and doesn’t cause significant structure perturbations by comparing with their corresponding native counterparts. In addition to the phase determination, the 2’-Se modification can also facilitate crystal growth of many oligonucleotides. Moreover, we have observed colorful DNAs and RNAs with the 4-Se modification for the first time. 2) The TeNA strategy by covalently incorporating tellurium functionalities into different positions of nucleic acids, particularly at the 2’ and 5 position of thymidine, has been developed. We have demonstrated the compatibility of the tellurium modification and solid-phase synthesis, as well as the potential application of the tellurium modifications in anti-viral drug synthesis and DNA-damage investigation.
6

Jayasekera, Sunil. "Study of the electrochemistry of gold telluride in acid and alkaline solutions". Thesis, Jayasekera, Sunil (1989) Study of the electrochemistry of gold telluride in acid and alkaline solutions. PhD thesis, Murdoch University, 1989. https://researchrepository.murdoch.edu.au/id/eprint/51563/.

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The work described in this thesis was undertaken to obtain a better understanding of the dissolution behaviour of gold tellurides which comprise a significant proportion of the gold found at Kalgoorlie, Western Australia and at other localities such as Fiji and Colorado. It deals mainly with a fundamental electrochemical study of synthetic calaverite (AuTe2). The electrochemical techniques of linear potential sweep voltammetry, cyclic voltammetry, controlled potential coulometry, controlled potential electrolysis and potentiometry were employed. To support and confirm the electrochemical results. the surface products formed during the reaction of AuTe2 were examined and identified using optical and scanning electron microscopy. In order to identify the features observed on the AuTe2 voltammograms resulting from electrochemically active tellurium species, the electrochemical behaviour of elemental tellurium was also investigated under similar experimental conditions as an integral part of this study. The anodic decomposition potentials of AuTe2 were determined as a function of pH and the results compared with potential-pH diagrams constructed using thermodynamic data. The initial oxidation products of AuTe2 in relatively strong acid perchlorate solutions have been shown to be metallic gold and soluble HTeO2+. This is in accord with the thermodynamic predictions, but the situation is complicated at higher anodic potentials due to the accumulation of sparingly soluble tellurous acid (H2TeO3). This species is also responsible for the passivation of the reacting surface at pH values above 2. The rate of dissolution of AuTe2 in chloride media is enhanced at higher chloride concentrations and lower pH. At low acid concentrations, the surface is passivated by the formation of a film of H2TeO3. The initial oxidation of AuTe2 in alkaline perchlorate solutions proceeds via formation of metallic gold and H2TeO3. Since H2TeO3 is readily dissolved in alkaline solutions the reacting surface remains active. The rate of dissolution increases with increasing pH. The rate of dissolution of AuTe2 in alkaline cyanide media increases with both cyanide concentration and pH. Using the appropriate Evans' diagrams, it was shown that under conventional cyanidation conditions the rate of dissolution is extremely slow. Ways of improving the dissolution rate are suggested. Alternatively, the feasibility of leaching AuTe2 in acid chloride media using oxidants such as Fe3+ was also demonstrated. The implications of the results obtained on likely hydroraetallurgical routes for the direct leaching of AuTe2 are discussed.
7

Mokmeli, Mohammad. "Kinetics of selenium and tellurium removal with cuprous ion from copper sulfate-sulfuric acid solution". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46407.

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Dissemination of selenium and tellurium in pyritic ores and many of the sulphide minerals results in the contamination of pregnant leach solutions and electrolytes in hydrometallurgical treatment of sulphide ores and residues. In an effort to reduce the detrimental effects of selenium and tellurium, it has been of great interest to remove selenium and tellurium from contaminated solutions to lower levels than allowed in regulations, product specifications or process requirements. The selenium and tellurium content of the solution may be reduced into insoluble precipitates of copper selenides and tellurides using cuprous ion. Cuprous ion has uses as a reducing agent in hydrometallurgical applications and can be specifically used to remove selenium and tellurium ions from copper sulphate-sulfuric acid solutions. In this study, the chemistry and kinetics of the removal of selenium and tellurium from copper sulfate-sulfuric acid solutions by cuprous ion reduction and precipitation was pursued. At first, a study of equilibrium cuprous concentrations for the cupric–copper metal reaction was performed and an empirical function capable of predicting the saturated [Cu+] was suggested at different temperatures, cupric and sulfuric acid concentrations. Secondly, the kinetics of the selenium removal with cuprous was studied and the mechanism of the reduction reaction and the rate law was determined over a wide range of acidity and temperature. The effects of temperature, acidity, cupric concentration and ionic strength on selenium removal rate were also studied. Subsequently, rate constants as functions of temperature, acidity and ionic strength were suggested. Thirdly, the tellurium reduction chemistry and reaction kinetics by means of cuprous in a wide range of conditions were investigated. The mechanism of the reaction, rate constants and activation energies were also determined. Similarly to selenium, effects of temperature and acidity on tellurium removal rate were also studied and rate constants as a function of temperature and acidity were suggested. Selenium and tellurium reduction reaction times can be estimated at different acidities and temperatures using the suggested rate laws and rate constant functions.
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Sampson, Zaiyaan Begum. "Tungsten Telluride Quantum dot-based Biosensor for Alpha-Methylacyl CoA Racemase – An Emerging Prostate Cancer Biomarker". University of the Western Cape, 2019. http://hdl.handle.net/11394/7709.

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>Magister Scientiae - MSc
Prostate cancer, commonly referred to as adenocarcinoma of the prostate, is the leading cause of cancer death in men in 46 countries, and it was estimated that by the end of 2018 there would approximately be 1.3 million new cases of prostate cancer worldwide. Currently, the Food and Drug Administration (FDA) approved biomarker for prostate cancer disease diagnostics Prostate Specific Antigen (PSA) is not specific to the disease itself but extends to other cases such as Benign Prostate Hyperplasia (BPH) a condition in which the prostate grows uncontrollably. This biomarker is then detected in blood samples via conventional methods which require a qualified individual to operate and are often time consuming. Examples of these methods are spectrophotometry and High Performance Liquid Chromatography (HPLC). Hence, a more efficient biomarker and method of detection is needed for prostate cancer disease diagnostics, as early detection of the disease means early treatment, which could ultimately save lives. Currently, an emerging biomarker for prostate cancer known as Alpha-Methyl CoA Racemase (AMACR) has shown to be more specific to the disease with advantages such as being a non-invasive biomarker. AMACR has been reported to be present in urine, and thus may be detected via a non-invasive method. This study proposed an economical, non-invasive electrochemical biosensor for the rapid detection of AMACR based on mercaptosuccinic acid capped tungsten telluride (MSA-WTe3) quantum dots (QDs). Nanomaterial has shown promise in terms of increasing the sensitivity and specificity of sensors. MSA-WTe3 QDs was successfully synthesized using easy, inexpensive method and was studied by various techniques such as High Resolution Transmission Electron Microscopy (HR-TEM) where the size was confirmed to be within the nanometer scale and was reported to be 2.65 nm with a good crystallinity. X-ray diffraction (XRD) confirmed the structural properties and chemical composition of the QDs and it is reported that the QDs are rich in both tellurium and tungsten and comprise of a hexagonal structure. Scanning Electron Microscopy (SEM) confirmed the successful immobilization of aptamer sequence specific to AMACR onto the electrode surface by showing a distinct conformational change when aptamers were introduced to the QDs under study. This study reports the successful detection of AMACR using an MSA-WTe3 QDs based aptasensor immobilized onto a screen printed glassy carbon electrode, with a detection limit of 0.35651 ng/mL and a limit of quantification calculated to be 1.08033 ng/mL.
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Lin, Tzu-Pin. "Tin, Antimony, Bismuth, and Tellurium Lewis Acids in sigma-Accepting Ligands for Transition Metals". Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11565.

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The interactions between ligands and transition metals have been an essential subject in inorganic chemistry. Other than the commonly known L-type (two-electron donors) and X-type ligands (one-electron donors), Z-type ligands (two-electron acceptors) have begun to surface in the past decade. Capable of drawing a pair of d-electrons away from a metal, Z-ligands affect the electronic structures of transition metals leading to fascinating properties as well as reactivity. In particular, recent advance in Z-ligand chemistry have resulted in the discovery of transition metal borane complexes featuring metal → boron interactions. Owing to the presence of a metal → boron interaction which stabilizes the low valent state, these complexes have been shown to activate small molecules such as H2, CO2, and CHCl3. Further, the concept of Z-ligand has been extended to s- and d-block Lewis acids. In spite of these achievements, Z-ligands that contain Group 14-16 elements as Lewis acids remain scarce and relatively unexplored. For this reason, we have launched a series of investigations targeting complexes with transition metal → Group 14-16 interactions. These investigations have allowed us to synthesize a series of novel complexes with palladium, platinum, or gold as metallobasic late transition metals and tin, antimony, bismuth, and tellurium as Lewis acids. The transition metal → Lewis acid interactions of these complexes, which are supported by o-phosphinophenylene, 1,8-naphthalenediyl or 8-quinolinyl buttresses, have been established experimentally and theoretically. Further, the reactivity of these complexes toward anions and oxidants has also been explored. These experiments have led to the discovery of tellurium-platinum complexes that sustain reversible two-electron redox processes including the photo-reductive elimination of chlorine. Other noteworthy outcomes of this research include the isolation of the first telluroxanyl-metal complex as well as the discovery of complexes with HgII → SbV interactions.
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Douman, Samantha Fiona. "The response dynamics of indium telluride quantum dots impedimetric genosensor for telomerase cancer biomarker". 2013. http://hdl.handle.net/11394/3499.

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Magister Scientiae - MSc
Cancer, the second most common cause of death after heart disease, is a complex and multifactorial disease that up to date is still under extensive research. To achieve early detection of cancer disease the discovery of specific, sensitive and reliable biomarkers is required. Telomerase is a ribonucleo-protein complex that has been identified as an important target for cancer diagnostics and cancer therapy, because 85% of more than 950 primary tumours express telomerase activity. The standard method for the detection and quantification of telomerase activity is the polymerase chain reaction (PCR)-based assay known as the telomeric repeat amplification protocol (TRAP) assay. TRAP and other methods developed for telomerase detection have limitations for example its time consuming, requires complicated machinery, expensive equipment and reagents thus there is a need for a more sensitive, reliable and high-throughput method. Electrochemical biosensors are quickly emerging as an alternative for early detection of cancer because they can be designed to detect developing cancer biomarkers and to allow improved monitoring of cancer growth and patient therapy. This research study reported for the first time the successful fabrication and implementation of highly sensitive 3-mercaptopropionic acid indium telluride quantum dots (3MPA-In2Te3 QDs) based genosensor for detection of telomerase biomarker. The colloidal poly-dispersed 3MPA-In2Te3 QDs introduced into the genosensor system were successfully synthesized by a simple, inexpensive and reproducible aqueous method. The as prepared 3MPA-In2Te3 QDs was characterized by Ultraviolet Visible (UV-VIS) spectroscopy, Fluorescence (FL) spectroscopy, X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy and High Resolution Transmission/Scanning Electron Microscopy (HR TEM/SEM). Electro-analysis of 3MPA-In2Te3 QDs was done by Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). HR-TEM studies revealed formation of small sized QDs about 6 nm in diameter while UV-VIS studies showed presence of iv absorption peaks in the ultraviolet region (100-400 nm) which confirmed the formation of these small sized QDs. The good electrochemical, optical, physical and chemical properties of the 3MPA-In2Te3 QDs allowed them to be used as a mediating platform between deoxyribonucleic acid (DNA) and gold electrode (AuE). The successful detection of telomerase was achieved by hybridization process between the probe single stranded deoxyribonucleic acid (ssDNA) drop coated on the 3MPA-In2Te3 QDs/AuE surface and its complementary ssDNA in biological buffer solution (0.10 M tris-ethylenediamine tetraacetic acid (TE) buffer solution, pH 8.00). The response of the 3MPA-In2Te3 QDs based genosensor towards different concentration of complementary ssDNA was studied by CV, square wave voltammetry (SWV) and EIS. It was observed that all three analytical techniques exhibited good linearity since their linear correlation coefficients (R2) corresponded to 0.99. However, it was observed that EIS was the best technique for the detection of telomerase compared to both CV and SWV since it showed a higher sensitivity (2.44 Ω/nM) towards detecting telomerase with a detection limit as low as 0.00014 ng/mL. Control experiments were also carried out by monitoring the hybridization process in the presence and absence of complementary ssDNA and it was determined that the QDs based genosensor was highly selective towards complementary ssDNA. In view of the attractive analytical characteristics and advantages, the ultimate goal of the developed QDs based genosensor is to apply it in real clinical samples of cancer cells or bodily fluids of cancer patients for the detection of telomerase cancer biomarker.

Capítulos de libros sobre el tema "Acide tellurique":

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Keller, P. A. "Selenium- and Tellurium-Based Anhydrides". En Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-00640.

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Chemler, S. R. y T. P. Zabawa. "Synthesis Using the Telluride Anion". En Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-01176.

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Vedantham, P., M. Jiménez y P. R. Hanson. "Addition of Sodium Hydrogen Telluride to Alkenes". En Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-00209.

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Drabowicz, J., P. Kiełbasiński, P. Łyżwa, A. Zając y M. Mikołajczyk. "Reaction of Carboxylic Acid Chlorides with Alkanesulfonic Acids". En Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-00090.

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Collier, S. J. "Synthesis from a Thiocarboxylic -Acid and an Electrophilic Selenium or ­Tellurium Fragment". En Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-01528.

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Drabowicz, J., P. Kiełbasiński, P. Łyżwa, A. Zając y M. Mikołajczyk. "Alkanesulfonic Acids". En Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-00036.

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Drabowicz, J., P. Kiełbasiński, P. Łyżwa, A. Zając y M. Mikołajczyk. "Alkanethiosulfonic Acids". En Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-00095.

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Drabowicz, J., P. Kiełbasiński, P. Łyżwa y M. Mikołajczyk. "Alkanesulfenic Acids". En Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-00637.

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Drabowicz, J., P. Kiełbasiński, P. Łyżwa y M. Mikołajczyk. "Alkaneselenonic Acids". En Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01137.

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García Ruano, J. L., M. B. Cid, A. M. Martín-Castro y J. Alemán. "Using Peroxy Acids". En Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-00376.

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Actas de conferencias sobre el tema "Acide tellurique":

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Poštová Slavětínská, Lenka, Radek Pohl y Dominik Rejman. "Conformation analysis of nucleoside analogues containing selenium and tellurium in five-membered pseudosugar ring". En XVIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2014. http://dx.doi.org/10.1135/css201414354.

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Vafaei, Saeid, Dongsheng Wen, Ganapathiraman Ramanath y Theodorian Borca-Tasciuc. "Surface Wettability Through Asymptotic Contact Angle". En ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78361.

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The purpose of this investigation is to find a unique and accurate criterion to measure surface wettability. The asymptotic contact angle (droplet contact angle in no gravity condition), which is independent of droplet size, is used to identify the surface wettability in this work. The asymptotic contact angle is calculated by equating the normal component of interfacial force on an axisymmetric droplet and spherical droplet. The effect of 2.5 nm bismuth telluride nanoparticles on surface wettability is measured and evaluated by asymptotic contact angles as a sample. This paper also studies the effects of nanoparticles on solid, gas and liquid interactions at the triple line as well as the gas-liquid surface tension of aqueous solutions of 2.5 nm bismuth telluride nanoparticles functionalized with thioglycolic acid. Experimental measurements of nanofluid droplet shapes show that the contact angle strongly depends on nanoparticle concentrations. Fitting the droplet shape with predictions of the Laplace-Young equation, the nanofluid gas-liquid surface tension is determined.
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Chen, Weilong y Yan Bai. "FTIR Study of Chemical Modification of Tellurium Oxide Nanoparticles by Dicarboxyl Amino Acids". En 3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ic3me-15.2015.437.

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Iqbal, Nafis, Mengjie Li, Kurt Mikeska, Meijun Lu, Tamil S. Sakthivel, Sudipta Seal y Kristopher O. Davis. "Impact of Acetic Acid Exposure on the Screen-Printed Tellurite-Based Silver Contacts". En 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC). IEEE, 2021. http://dx.doi.org/10.1109/pvsc43889.2021.9518870.

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