Relevant bibliographies by topics / Catalyseur modifie

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Catalyseur modifie'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Catalyseur modifie"

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Shabanova, Z. A. "OXIDATIVE DEHYDROGENATION OF CYCLOHEXANOL TO CYCLOHEXANONE CATALYSED BY MODIFIED ZEOLITE CATALYST." Azerbaijan Chemical Journal, no. 4 (December 12, 2020): 72–75. http://dx.doi.org/10.32737/0005-2531-2020-4-72-75.

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Gas-phase oxidative dehydrogenation at atmospheric pressure and a temperature of 260–3700С in the presence of a modified zeolite catalyst clinoptilolite cyclohexanol with a conversion of 90–99 % was oxidized to cyclohexanone with the selectivity of 96–98 %. It has been studied kinetic laws of the reaction
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WATTS, Andrew G., and Stephen G. WITHERS. "Glycosynthase-catalysed formation of modified polysaccharide microstructures." Biochemical Journal 380, no. 1 (May 15, 2004): e9-e10. http://dx.doi.org/10.1042/bj20040633.

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Glycosynthases are mutant glycosidases, genetically engineered to catalyse the synthesis of oligosaccharides. A study by Faijes et al. in this issue of the Biochemical Journal has expanded the ability of glycosynthases to catalyse the polymerization of carbohydrates to form unnatural oligosaccharide products that can attain unique crystalline forms. These findings reinforce the potential of glycosynthases as interesting and important tools for the enzymic synthesis of novel carbohydrates with specific and controlled structures.
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Lei, Yi, and Ryan Hili. "Structure–activity relationships of the ATP cofactor in ligase-catalysed oligonucleotide polymerisations." Organic & Biomolecular Chemistry 15, no. 11 (2017): 2349–52. http://dx.doi.org/10.1039/c6ob02792j.

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Berdini, Valerio, Maria C. Cesta, Roberto Curti, Gaetano D'Anniballe, Nicoletta Di Bello, Giuseppe Nano, Luca Nicolini, Alessandra Topai, and Marcello Allegretti. "A modified palladium catalysed reductive amination procedure." Tetrahedron 58, no. 28 (July 2002): 5669–74. http://dx.doi.org/10.1016/s0040-4020(02)00530-6.

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Li, C., C. D. Oldham, and S. W. May. "NN-dimethyl-1,4-phenylenediamine as an alternative reductant for peptidylglycine α-amidating mono-oxygenase catalysis." Biochemical Journal 300, no. 1 (May 15, 1994): 31–36. http://dx.doi.org/10.1042/bj3000031.

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C-terminal alpha-amidation is a structural feature essential to the biological activity of many peptide hormones. Peptidylglycine alpha-amidating mono-oxygenase (PAM; EC 1.14.17.3) catalyses conversion of glycine-extended peptide hormone precursors into their corresponding alpha-hydroxyglycine derivatives. This reaction is the first step in the C-terminal amidation process. We report here that in the presence of molecular O2, copper and PAM substrate, NN-dimethyl-1,4-phenylenediamine (DMPD) serves as the requisite electron donor for the mono-oxygenase, being oxidized in the process to a stable and highly chromophoric cation radical. By monitoring the rate of increase in absorbance at 515 nm, PAM activity can be easily followed. This provides a spectrophotometric assay for PAM, which represents the first continuous assay reported for this enzyme. DMPD-supported PAM-catalysed mono-oxygenation exhibits normal Michaelis-Menten kinetic behaviour. Steady-state kinetic studies established that both the ascorbate-supported and DMPD-supported PAM reactions exhibit apparent ‘Ping Pong’ kinetics. In addition, both electron donors give rise to similar pH profiles and identical inhibition patterns towards known competitive inhibitors of PAM. The stoichiometry between formation of the DMPD cation radical and the alpha-hydroxyglycine PAM product was determined to be 2:1, the value expected for a monooxygenase-catalysed reaction. The optimum pH for the DMPD-supported continuous PAM assay was found to be about 5.5. The major advantage of this assay over all previously reported methods is that it is continuous; thus accurate initial rates are easily obtained. Moreover, unlike previous assay methods, 125I-labelled or chromophorically modified substrates are not required. Kinetic parameters for a broad range of PAM substrates and inhibitors have been successfully obtained using this assay.
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Zhang, Mei, and Genping Huang. "Mechanism of iridium-catalysed branched-selective hydroarylation of vinyl ethers: a computational study." Dalton Transactions 45, no. 8 (2016): 3552–57. http://dx.doi.org/10.1039/c5dt04973c.

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Bedford, Monte S., Xiaoyan Yang, Kara M. Jolly, Rachel L. Binnicker, Samuel B. Cramer, Caitlin E. Keen, Connor J. Mairena, et al. "Tetraarylphosphonium polyelectrolyte chromophores: synthesis, stability, photophysics, film morphology and critical surface energy." Polymer Chemistry 6, no. 6 (2015): 900–908. http://dx.doi.org/10.1039/c4py01483a.

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Djakovitch, Laurent, and Klaus Koehler. "Heterogeneously catalysed Heck reaction using palladium modified zeolites." Journal of Molecular Catalysis A: Chemical 142, no. 2 (June 1999): 275–84. http://dx.doi.org/10.1016/s1381-1169(98)00292-1.

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Vermeer, Wilhelmus A. H., Anthony Fulford, Peter Johnston, and Peter B. Wells. "New Enantioselective Reactions catalysed by cinchonidine-modified platinum." Journal of the Chemical Society, Chemical Communications, no. 13 (1993): 1053. http://dx.doi.org/10.1039/c39930001053.

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Choudary, B. M., M. Lakshmi Kantam, Ch Venkat Reddy, K. Koteswara Rao, and F. Figueras. "Henry reactions catalysed by modified Mg–Al hydrotalcite:." Green Chemistry 1, no. 4 (1999): 187–89. http://dx.doi.org/10.1039/a904075g.

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Dissertations / Theses on the topic "Catalyseur modifie"

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Boudouvas, Denis. "Effet du potassium sur un catalyseur composite Fe-Co-C en synthèse d'hydrocarbures." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0092.

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Etude de la promotion par le potassium du catalyseur composite fe-co-c, c'est-a-dire de l'amelioration de son activite catalytique et de sa selectivite en alcenes. L'addition de potassium est realisee soit par impregnation par une solution aqueuse de k#2co#3, soit par la formation intermediaire d'un compose d'insertion avec le carbone de formule kc#3#2. L'evolution de la selectivite des catalyseurs promus et non promus par le potassium est etudiee a des conversions en monoxyde de carbone analogues a celles d'un procede industriel. Des tests catalytiques a faible conversion et des mesures de chimisorption de gaz reagissants sont effectues
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Lin, Liming. "Craquages d'alcanes sur catalyseurs zeolithiques : influence du nickel et du vanadium." Poitiers, 1987. http://www.theses.fr/1987POIT2316.

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ABOU, MRAD CHAFIC. "Synthese du methanol et d'alcools superieurs sur catalyseurs cuo-zno modifies." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13200.

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Mise au point sur la synthese du methanol en presence de cuo-zno et mise en evidence de l'influence du pretraitement et de l'effet benefique des promoteurs(cao,tho::(2),al::(2)o::(3), zro::(2),bao et sro)
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Ecolivet, Christian. "Caracterisation par spectroscopie de reflexion diffuse d'alumines modifiees par ajout de phosphate et des oxydes ni-mo supportes : correlations avec les proprietes hydrogenantes des catalyseurs sulfures." Caen, 1987. http://www.theses.fr/1987CAEN2049.

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TAZKRITT, SAID. "Etude du role des supports et promoteurs en reaction co/h : :(2) sur des catalyseurs a base de rhodium." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13102.

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Etude combinee de la reactivite, de la thermodesorption programmee et du piegeage chimique sur des catalyseurs au rhodium. Le role des promoteurs sur les changements d'activite et de selectivite est aborde. Un nouveau type d'adsorption du monoxyde de carbone peut etre observe. Pour ce nouveau mode d'adsorption, la spectrometrie infra rouge est utilisee
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Romeo, Michelangelo. "Proprietes des catalyseurs intermetalliques platine-uranium, platine sur oxyde d'uranium et platine-cobalt-oxyde d'uranium sur alumine pour les reactions de rearrangement de squelette des hydrocarbures." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13098.

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Zivkov, Catherine. "Etude de catalyseurs a base d'argiles et d'argiles a piliers pour la methanisation du gaz de synthese." Poitiers, 1987. http://www.theses.fr/1987POIT2205.

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Amelioration des performances de catalyseurs kaoliniques ligniteux, par preparation de montmorillinites et de laponites a piliers. Etude de l'activite et de la selectivite de ceux-ci dans la synthese d'olefines. Explication des proprietes des materiaux par la creation d'interactions fortes entre al et fe et par la distribution laterale des piliers
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Tyburce, Bernard. "Application de l'échange ionique à la caractérisation des zéolithes." Poitiers, 1987. http://www.theses.fr/1987POIT2036.

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Maldonado, Barrios Adriana. "Transestérification des acrylates par catalyse basique hétérogène." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10106/document.

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Dans ce travail, nous présentons une étude originale de l'utilisation des catalyseurs basiques solides dans la réaction de transestérification des acrylates. La réaction de l'acrylate d'éthyle avec le n-hexanol a été choisie comme réaction modèle. Les catalyseurs employés, à base d'alumines modifiées par des ions alcalins, alcalino-terreux ou fluorures, se sont avérés être actifs et sélectifs dans la réaction de transestérification, réalisée en conditions douces, sans solvant, en utilisant un rapport stoéchiométrique des réactifs. Les réactions secondaires ont été identifiées comme étant des réactions d'addition de Michael. Nous avons mis en évidence que la réaction de transestérification se produit sur des sites basiques faibles, le catalyseur Ca(NO3)2/ γ-Al2O3 ayant montré la sélectivité la plus élevée en acrylate d'hexyle (> 90%) pour une conversion supérieure à 60%. L'étude du recyclage du catalyseur nous a permis de déterminer les facteurs les plus influents tels que le contact du catalyseur avec le CO2 et l'eau ainsi que la teneur en fer de l'alumine employée comme support. Ces facteurs sont déterminants pour le recyclage du catalyseur, qui peut alors être recyclé jusqu'à 4 fois dans la réaction de transesterification de l'acrylate d'éthyle par le n-hexanol sans observer de changements significatifs de la conversion et de la sélectivité
We present an original study of the use of solid basic catalysts in the transesterification reaction of acrylates. The reaction of ethyl acrylate with n-hexanol was chosen as model reaction. The catalysts employed, based on alumina modified with alkalin, alkalin earth, and fluoride ions were shown to be active and selective for the reaction of transesterification reaction carried out under mild conditions, without solvent, using a stoechiometric amount of reactants . The secondary reactions were identified as Michael addition reactions. We demonstrated that the transesterification reaction occurs on weak basic sites, the catalyst Ca (NO3)2 /γ-Al2O3 has shown the highest selectivity in the hexyl acrylate (> 90%) for conversion greater than 60%. The study of the catalyst recycling allowed to determine the most influential factors such as the catalysts contact between CO2 and water as well as the iron content of the alumina support. These factors are critical to the success of the catalyst recycling, which was done four times in the reaction of transesterification of ethyl acrylate with n-hexanol without observing significant changes in the conversion and selectivity
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HOANG, LE CHIEN. "Conversion selective des polyols sur catalyseurs au ruthenium modifie." Poitiers, 1990. http://www.theses.fr/1990POIT2275.

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La transformation des polyols a ete etudiee en phase aqueuse, sur catalyseurs a base de ruthenium, seul ou modifie par des ajouts: cu, sn, pb et le soufre. Le ruthenium est depose, a partir de rucl#3 ou de ru(nh#3)#6cl#3, par impregnation simple ou echange cationique, sur deux supports: une silice de 250 m#2/g et un charbon actif de 850 m#2/g. Les catalyseurs obtenus ont ete caracterises par chimisorption et titrage h#2-o#2 en isotherme ou en temperature programmee. Les catalyseurs ru/charbon, stables en milieu aqueux dans les conditions d'etude de la transformation des polyols, ont ete modifies par des ajouts metalliques: cu, pb, sn deposes par la technique de reduction catalytique ou par du soufre depose par impregnation. Ces ajouts sont en interaction avec le metal bien qu'ils ne modifient pas l'accessibilite du metal a l'hydrogene ou a l'oxygene. Cu, pb, sn et s desactivent beaucoup plus l'hydrogenolyse du glycerol (210c) que l'hydrogenation du xylose (100c). Pour un taux de recouvrement egal a 1 en cu, pb ou sn les polyols sont transformes par hydrogenolyses competitives des liaisons c-c et c-o. Dans le cas du cu depose sur le ru, on ne retrouve pas les proprietes des catalyseurs a base de cu sur lesquels on a depose du ru qui, eux ne sont pas hydrogenolysants. Le depot de s sur le ruthenium donne un catalyseur faiblement actif mais dont la selectivite se rapproche de celle du cu pur. Il catalyse, dans le cas du glucitol, une coupure c-c selective en milieu de chaine (reaction de retro-michael)
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Book chapters on the topic "Catalyseur modifie"

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BORNSCHEUER, UWE T., MAREK ADAMCZAK, and MOHAMED M. SOUMANOU. "Lipase-catalysed synthesis of modified lipids." In Lipids for Functional Foods and Nutraceuticals, 149–82. Elsevier, 2012. http://dx.doi.org/10.1533/9780857097965.149.

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Conference papers on the topic "Catalyseur modifie"

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Johannessen, M., F. E. Nielsen, K. Pingel, and L. C. Petersen. "FIBRINOLYTIC EFFECT OF ONE-CHAIN TTSSUE-TYPE PLASMINOGEN ACTIVATOR." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644406.

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The fibrinolytic properties of authentic one- and two-chain recombinant tPA were compared to those of a plasmin resistant one-chain tPA analogue, tPA-Gly275, which is point mutated in Arg275 of the activation site. The proteins were characterised by reversed phase HPLC, reduced SDS-PAGE, and their concentrations determined by the BCA (modified Lowry) method. When equivalent conc. of these enzymes were tested for fibrinolytic activity by means of clot lysis and fibrin plate lysis methods, the values found for two-chain tPA were consistently 50% higher than one-chain tPA forms. The time course for plasmin catalysed one-chain tPA cleavage during fibrin clot lysis was determined by means of 125I-tPA. The cleavage is not instantaneous, and one-chain tPA may account for a considerable fraction of the total amount of plasmin formed. This is confirmed by similar experiments with 125I-tPA-Gly275, which is essentially intact one-chain tPA at the time of fibrin clot lysis. The effect of tPA activation site cleavage was also studied using plasmin coupled to sepharose beads. Plasmin sepharose was removed at different time intervals, and tPA was tested for amidolytic activity with > Glu-Gly-Arg-pNA and fibrinolytic activity as measured by fibrin clot lysis time as well as by fibrin plate methods. The results indicate that in the presence of fibrin, plasminogen can be activated by one-chain tPA at a considerable rate. On the other hand, the fact that the fibrinolytic activity measured by conventional assays is lower with one-chain tPA than with two-chain tPA should be considered when of these methods are used for standardization.
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Hopple, Sara, Mark Bushfield, Fiona Murdoch, and D. Euan MacIntyre. "REGULATION OF PLATELET cAMP FORMATION BY PROTEIN KINASE C." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644512.

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Exogenous synthetic 1,2-diacylglycerols (e.g. 1,2-dioctanoylglycerol, DiC8) and 4β Phorbol esters (e.g. phorbol myristate acetate, PMA) routinely are used to probe the effects of protein Kinase C (PKC) on cellular responsiveness. Such agents act either independently or synergistically with elevated [Ca2+]i to induce platelet activation, but also inhibit agonist-induced inositol lipid metabolism and Ca2+ flux. These findings led to the concept that activated PKC can function as a bi-directional regulator of platelet reactivity. Therefore, DiCg and PMA were utilized to examine the effects of activated PKC on receptor-mediated stimulation and inhibition of adenylate cyclase, as monitored by cAMP accumulation. All studies were performed using intact human platelets in a modified Tyrodes solution, and cAMP was quantified by radioimmunoassay. Pretreatment (2 min.; 37°C) of platelets with PMA (≤ 300 nM) but not DiCg (200 μM) attenuated the elevation of platelet cAMP content evoked by PGD2 300 nM) but not by PGE1 (≤300 nM), PGI2 (≤100 nM) or adenosine (≤ 100 μM).These effects of PMA were unaffected by ADP scavengers, by Flurbiprofen (10 μM) or by cAMP phosphodiesterase inhibitors (IBMX, 1 mM) but were abolished by the PKC inhibitor Staurosporine (STP, 100 nM). In contrast, DiC8 (200 μM), but not PMA ( ≤ 300 nM), reduced the inhibitory effect of adrenaline (5 μM) on PGE1 (300 nM)-induced cAMP formation. This effect of DiCg was unaltered by STP (100 nM). Selective inhibition of PGD2-induced cAMP formation by PMA most probably can be attributed to PKC catalysed phosphorylation of the DP receptor. Reduction of the inhibitory effect of adrenaline by DiC8 could occur via an action at the α2 adrenoreceptor or Ni. These differential effects of PMA and DiC8 may result from differences in their distribution or efficacy, or to heterogeneity of platelet PKC.
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