Letteratura scientifica selezionata sul tema "Oxydation biologique du fer"
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Articoli di riviste sul tema "Oxydation biologique du fer":
Mansour, Hedi Ben, Oualid Boughzala, dorra Dridi, Daniel Barillier, Leila Chekir-Ghedira e Ridha Mosrati. "Les colorants textiles sources de contamination de l’eau : CRIBLAGE de la toxicité et des méthodes de traitement". Revue des sciences de l’eau 24, n. 3 (28 novembre 2011): 209–38. http://dx.doi.org/10.7202/1006453ar.
Falcon, M., B. Peyrille, P. Reihac, J. N. Foussard e H. Debellefontaine. "Oxydation en voie humide de la pollution organique aqueuse par le peroxyde d'hydrogène Procédé « Wet Peroxide Oxidation » (WPO®) Étude de nouveaux catalyseurs". Revue des sciences de l'eau 6, n. 4 (12 aprile 2005): 411–26. http://dx.doi.org/10.7202/705183ar.
Pons, Michel, Hassan Gharnit, Alain Galerie e Marcel Caillet. "Revêtements de carbure de bore sur fer élaborés sous irradiation laser II. Oxydation des revêtements". Surface and Coatings Technology 35, n. 3-4 (novembre 1988): 275–83. http://dx.doi.org/10.1016/0257-8972(88)90041-2.
Siffert, B., e A. Naidja. "Decarboxylation catalytique de l'acide oxaloacetique en presence de montmorillonite". Clay Minerals 22, n. 4 (dicembre 1987): 435–46. http://dx.doi.org/10.1180/claymin.1987.022.4.07.
Kamgaing, Théophile. "Précipitation de carbonates de cations divalents dans les systèmes lacustres : intérêt, état des connaissances des mécanismes et suggestions (Revue critique de la littérature)". Revue des sciences de l’eau 28, n. 2 (7 luglio 2015): 81–102. http://dx.doi.org/10.7202/1032292ar.
Kaemmerer, Michel, e Jean-Claude Revel. "Signification des précipitations d'origine biologique de fer et de manganèse dans les alluvions quaternaire du Sébou (Maroc)". Bulletin de l'Association française pour l'étude du quaternaire 26, n. 4 (1989): 213–18. http://dx.doi.org/10.3406/quate.1989.1910.
Lefebvre-Drouet, E. "Dissolution de differents oxyhydroxydes de fer par voie chimique et par voie biologique: Importance des bacteries reductrices". Soil Biology and Biochemistry 27, n. 8 (agosto 1995): 1041–50. http://dx.doi.org/10.1016/0038-0717(95)00012-4.
Al-Hayek, N., e M. Doré. "Oxydation des phenols par le peroxyde d'hydrogene en milieu aqueux en presence de fer supporte sur alumine". Water Research 24, n. 8 (agosto 1990): 973–82. http://dx.doi.org/10.1016/0043-1354(90)90119-q.
Tankeu, Aurel T., e Christel Tran. "Fatigue chronique: quand suspecter une maladie héréditaire du métabolisme?" Praxis 111, n. 1 (gennaio 2022): 38–43. http://dx.doi.org/10.1024/1661-8157/a003772.
Diek Van Mansvelt, Jan. "Vers une agriculture renouvelable et durable. Agriculture biologique : d'une avant-garde marginale au fer de lance d'une agriculture d'avenir". Tiers-Monde 33, n. 130 (1992): 311–28. http://dx.doi.org/10.3406/tiers.1992.4691.
Tesi sul tema "Oxydation biologique du fer":
Marvilliers, Sandrine. "Synthèses, caractérisations et études du comportement en oxydation de complexes dinucléaires fer-oxo et manganèse-oxo d'intérêt biologique". Paris 11, 1999. http://www.theses.fr/1999PA112302.
Fernandez, Rojo Lidia. "Vers un traitement passif des drainages miniers acides (DMA) riches en arsenic par oxydation biologique du fer et de l'arsenic". Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT153.
Acid mine drainage (AMD) are produced by sulfuric tailings from mining of metal ores. They are characterized by high contents of toxic elements like arsenic. One efficient and economical solution for the treatment of As in these tailings could be the use of a passive method based on iron and arsenic bacterial oxidation, and the subsequent precipitation of these elements in a stable form. In this context, the objective of this PhD thesis was to better understand the environmental and operational factors controlling the efficiency of As removal processes. A continuous-flow pilot approach was implemented in order to better reproduce the real treatment conditions. This study was first performed in a bench-scale bioreactor with controlled conditions (temperature, light, flow, residence time and water height). Then, it was performed in a field-scale bioreactor installed in situ, reproducing a passive treatment in real conditions. These devices were fed with As-rich AMD waters from the ancient mine of Carnoulès (Gard, France). Water and bioprecipitate properties were monitored in both devices, specially the redox speciation of iron and arsenic. This monitoring was held for different environmental and operational conditions. Iron and arsenic speciation in liquid and solid phases was measured by different analytical techniques such as HPLC-ICP-MS, EXAFS and XANES. Mineral identification was made by XRD analysis, while microbiological characterization was made by ARISA, high-throughput sequencing of 16S rRNA gene, and aioA gene quantification. Results from the lab-scale experiments evidenced the effects of the different operational parameters (water height, hydraulic retention time and the presence/absence of a floating film) on the treatment performance, as well as on the microbiology and mineralogy of the produced bioprecipitates. The field device was used to test the treatment performance under fluctuating environmental conditions (variability of the physico-chemistry of the feed water and of the temperature) and to gain new knowledge about the evolution of the bioprecipitates during six months of treatment. All the knowledge acquired in this PhD thesis could serve as a basis for the design of an arsenic removal stage in DMA treatment processes
ABALEA, VALERIE. "Etude des dommages oxydatifs de l'adn et de leur reparation dans les hepatocytes en culture traites par le fer : effet chimioprotecteur du flavonoide myricetine (doctorat : sciences biologiques et sante)". Rennes 1, 1999. http://www.theses.fr/1999REN1BO49.
Bondet, Vincent. "Oxydation de l'acide linoléique initiée par le système fer (II) / acide ascorbique en milieu dispersé : Mécanismes réactionnels et modes d'action de quelques antioxydants phénoliques". Compiègne, 1999. http://www.theses.fr/1999COMP1187.
The antioxidant behaviour of phenolic compounds depends on several factors with the structure of the medium playing a major part. The inhibition effects of 17 phenolic compounds on the oxidation of linoleic acid dispersed in an aqueous phase were studied. Conjugated dienes typically formed during the fust step of oxidation, and volatile compounds coming frOID the decomposition ofhydroperoxides, were monitored simultaneously in this study. The iron-ascorbate system was used as oxidation initiator and the experimental conditions were first adjusted. Mechanisms involving various active species were studied and appropriate concentration levels were chosen to achieve a simple and exploitable response. Ln that dispersed medium, a series of reactions and migrations of active species took place. The quick first step which was induced by the iron-ascorbate system was generated at the interface and gave way to a propagation step which took place in much deeper layers and which was characterised by a steady - rate for several hours. A relation between the efficiency of the studied antioxidants against the production of volatile compounds which are typical of rancidity and their ability to inhibit the formation of dienes was demonstrated. The relation between high antioxidant effect and apolarity has been established as in the 'polar paradox' firstly described by PORTER. This phenomena is explained by the concentration of non-polar compounds at the interface of the micelles. For similar polarities, antioxidant effect seemed to increase with the number of phenolic functions or groups able to chelate iron ions. To study the antiradical effect separately, the reduction of DPPH radical by three different antioxidants (BHT, eugenol and isoeugenol) in methanol was the method of choice. Bach molecule showed its own antiradical kinetics, reaction time, stoichiometry and reaction orders. Reactional mechanisms were proposed for each case
Miot, Jennifer. "Processus microbiens de biominéralisation et de détoxification des métaux/métalloïdes : oxydation du fer par des bactéries anaérobies neutrophiles et résistance au fer et à l'arsenic chez des eucaryotes unicellulaires de drainages miniers acides". Paris 7, 2008. http://www.theses.fr/2008PA077228.
This work aimed at studying the response of microorganisms to toxic elements, such as arsenic and to the lethal effects of mineral precipitation within cellular structures. We applied microscopic and spectroscopic tools adapted to the study of these organic-mineral assemblages. In a first section, we studied two different bacterial strains, both using Fe(II) as an electron donor under strictly anoxic conditions at neutral pH. The phototrophic strain SW2 precipitated iron on lipo-polysaccharidic fibres only at distance from the cells, whereas the denitrifying strain BoFeNl precipitated iron within its periplasm. Ultrafine cellular structures and proteins were preserved within these encrusted cells that can be considered as microfossils. In a second section, we studied unicellular eukaryotes from a Fe and As-rich acid mine drainage. Iron accumulation within the cells was shown to be completely decoupled from the processes of arsenic detoxification. Arsenic detoxification starts with As(V) reduction to As(III), followed by its complexation by thiol groups, involving the glutathione pathway and leading to its export from the cell. However, we show that As(V) was more toxic to the cells than As(III). Our results altogether provide new insights on the mechanisms of microbial biomineralization and detoxification of metals/metalloids and opens new perspectives for the search of biosignatures of specific metabolisms
Chakchouk, Mehrez. "Oxydation de la pollution organique aqueuse par l'oxygène moléculaire à haute température : effet promoteur de H2O2". Toulouse, INSA, 1993. http://www.theses.fr/1993ISAT0018.
Fakih, Mohamad. "Biogéochimie du fer et des éléments associés : Exemple de l'arsenic (V)". Phd thesis, Université Rennes 1, 2008. http://tel.archives-ouvertes.fr/tel-00578005.
Bardou-Jacquet, Édouard. "Surcharges en fer rares d’origine génétique : caractérisation clinique, fonctionnelle, et biologique". Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S156/document.
HFE related hemochromatosis (HH) is characterized by an increased plasma transferrin saturation level, which causes iron overload. These anomalies are due to low hepcidin secretion, the key regulator of iron metabolism, and define the hepcidin deficiency phenotype. New forms of iron overload with similar phenotype were identified, but their molecular mechanisms remain unclear. The main objective of this work was to characterize the clinical, functional, and biological aspects of rare genetic iron overload with an hepcidin deficiency phenotype. We firstly analyzed a cohort of HH patients, archetype of hepcidin-deficiency and showed that liver transplantation cured the disease, demonstrating the major role of the liver in the phenotype. We then characterized iron overloads with high transferrin saturation related to abnormalities of iron transport: i) we reported a fifth case of patient with DMT1 gene mutations and demonstrated the pathogenicity of the mutation p.Asn491Ser; ii) we described 12 patients with heterozygous mutation of the TF gene, leading to serum transferrin decrease. The increase of transferrin saturation associated to the disease does not seem to be related to a hepcidin-deficiency, and the presence of cofactors may facilitate iron overload. We then described the impact of mutations in the TFR2 gene, which induce hepcidin-deficiency whose expression is heterogeneous but that can occur in young peoples. Then we tried to clarify in vitro the mechanisms linking mutations in the TFR2 gene to an abnormal decrease of hepcidin and showed that the p.Asn12Ile and p.Gly430Arg mutations alter the TFR2 protein intracellular trafficking while the p.Arg768Pro mutation alters its interaction with transferrin. Being unable to induce expression of hepcidin in response to transferrin, unlike some authors, but in agreement with others, we were not able to analyze the impact of mutations on signal transduction toward hepcidin. Our results help to clarify the mechanisms involved in the development of iron overload in rare high saturation of transferrin
Courteix, Anne. "Modulation electrochimique de l'activité biologique de protéines à fer". Toulouse 3, 1991. http://www.theses.fr/1991TOU30167.
Faye, Jérémy. "Oxydation du phénol en milieu aqueux par le peroxide d'hydrogène en présence d'oxydes de type pérovskite à base de fer". Poitiers, 2007. http://www.theses.fr/2007POIT2296.
According to the drastic environmental legislation, advanced oxidation processes have been developed to satisfy the objectives in water depollution. Among these new technologies, catalytic wet hydrogen peroxide oxidation process allows to perform oxidation of organic pollutants in ambient conditions. The homogeneous Fenton system (Fe2+/H2O2), applied to industrial wastewater decontamination, could be advantageously improved by using stable heterogeneous catalysts more suitable for environmentally friendly processes. In this respect, perovskite type oxides (formula ABO3) behave as excellent candidates for the stabilization of the transition metal cation within the crystal structure, thereby limiting leaching of the active phase (i. E. Fe3+). In this work, a series of iron-based perovskites AFeO3 (with A = La, Nd, Pr, Sm, Y) was prepared by two different synthesis procedures, fully characterized and tested for the wet peroxide oxidation of phenol in aqueous solution. Relationship between the perovskites catalytic activity and stability and their physico-chemical properties (reducibility and textural characteristics) is highlighted. The most efficient catalysts were selected based on their ability to completely oxidize the organic pollutant in CO2 and on their stability in aqueous solution. A second series of non stoichiometric iron-based perovskites with general formula A1-xFeO3-δ (A = La, Pr and Sm and x = 0, 0. 1, 0. 2, 0. 3, 0. 4) was prepared in order to modulate the iron reducibility inside the perovskite network. The influence of this parameter on the catalytic activity was determined for various oxidation reactions in aqueous solution (phenol) and in gas phase (methane)
Libri sul tema "Oxydation biologique du fer":
Cren, Frédéric Le. Les antioxydants, la révolution du XXIe siècle. Outremont, Qué: Quebecor, 1999.
Cren, Frédéric Le. Les antioxydants, la révolution du XXIe siècle. 2a ed. Outremont, Qué: Éditions Quebecor, 2004.
Lester, Packer, e Ong Augustine S. H, a cura di. Biological oxidants and antioxidants: Molecular mechanisms and health effects. Champaign, Ill: AOCS Press, 1998.
1940-, Chow Ching Kuang, a cura di. Cellular antioxidant defense mechanisms. Boca Raton, Florida: C.R.C. Press, 1988.
1931-, Armstrong Donald, a cura di. Free radical and antioxidant protocols. Totowa, N.J: Humana Press, 1998.
G, Cutler Richard, e International Conference on Oxidative Stress and Aging (1st : 1994 : Hawaii), a cura di. Oxidative stress and aging. Basel: Birkhauser Verlag, 1995.
Lester, Packer, a cura di. Oxidants and antioxidants. San Diego: Academic Press, 1999.
(Editor), Tapan K. Basu, Norman J. Temple (Editor) e Manohar L. Garg (Editor), a cura di. Antioxidants in Human Health and Disease. CABI, 1999.
Cassarini, Chiara. Anaerobic Oxidation of Methane Coupled to the Reduction of Different Sulfur Compounds As Electron Acceptors in Bioreactors. Taylor & Francis Group, 2019.
Cassarini, Chiara. Anaerobic Oxidation of Methane Coupled to the Reduction of Different Sulfur Compounds As Electron Acceptors in Bioreactors. Taylor & Francis Group, 2018.