Relevant bibliographies by topics / Cycle redox

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Cycle redox'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Cycle redox"

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Wigginton, N. S. "The phosphorus redox cycle." Science 348, no. 6236 (May 14, 2015): 768. http://dx.doi.org/10.1126/science.348.6236.768-k.

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Diaz Vivancos, Pedro, Tonja Wolff, Jelena Markovic, Federico V. Pallardó, and Christine H. Foyer. "A nuclear glutathione cycle within the cell cycle." Biochemical Journal 431, no. 2 (September 28, 2010): 169–78. http://dx.doi.org/10.1042/bj20100409.

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The complex antioxidant network of plant and animal cells has the thiol tripeptide GSH at its centre to buffer ROS (reactive oxygen species) and facilitate cellular redox signalling which controls growth, development and defence. GSH is found in nearly every compartment of the cell, including the nucleus. Transport between the different intracellular compartments is pivotal to the regulation of cell proliferation. GSH co-localizes with nuclear DNA at the early stages of proliferation in plant and animal cells. Moreover, GSH recruitment and sequestration in the nucleus during the G1- and S-phases of the cell cycle has a profound impact on cellular redox homoeostasis and on gene expression. For example, the abundance of transcripts encoding stress and defence proteins is decreased when GSH is sequestered in the nucleus. The functions of GSHn (nuclear GSH) are considered in the present review in the context of whole-cell redox homoeostasis and signalling, as well as potential mechanisms for GSH transport into the nucleus. We also discuss the possible role of GSHn as a regulator of nuclear proteins such as histones and PARP [poly(ADP-ribose) polymerase] that control genetic and epigenetic events. In this way, a high level of GSH in the nucleus may not only have an immediate effect on gene expression patterns, but also contribute to how cells retain a memory of the cellular redox environment that is transferred through generations.
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Kang, Y. James. "Metallothionein Redox Cycle and Function." Experimental Biology and Medicine 231, no. 9 (October 2006): 1459–67. http://dx.doi.org/10.1177/153537020623100903.

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Bush, T., I. B. Butler, A. Free, and R. J. Allen. "Redox regime shifts in microbially mediated biogeochemical cycles." Biogeosciences 12, no. 12 (June 17, 2015): 3713–24. http://dx.doi.org/10.5194/bg-12-3713-2015.

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Abstract. Understanding how the Earth's biogeochemical cycles respond to environmental change is a prerequisite for the prediction and mitigation of the effects of anthropogenic perturbations. Microbial populations mediate key steps in these cycles, yet they are often crudely represented in biogeochemical models. Here, we show that microbial population dynamics can qualitatively affect the response of biogeochemical cycles to environmental change. Using simple and generic mathematical models, we find that nutrient limitations on microbial population growth can lead to regime shifts, in which the redox state of a biogeochemical cycle changes dramatically as the availability of a redox-controlling species, such as oxygen or acetate, crosses a threshold (a "tipping point"). These redox regime shifts occur in parameter ranges that are relevant to the present-day sulfur cycle in the natural environment and the present-day nitrogen cycle in eutrophic terrestrial environments. These shifts may also have relevance to iron cycling in the iron-containing Proterozoic and Archean oceans. We show that redox regime shifts also occur in models with physically realistic modifications, such as additional terms, chemical states, or microbial populations. Our work reveals a possible new mechanism by which regime shifts can occur in nutrient-cycling ecosystems and biogeochemical cycles, and highlights the importance of considering microbial population dynamics in models of biogeochemical cycles.
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Da Lozzo, Eneida Janiscki, Antonio Salvio Mangrich, Maria Eliane Merlin Rocha, Maria Benigna Martinelli de Oliveira, and Eva Gunilla Skare Carnieri. "Effects of citrinin on iron-redox cycle." Cell Biochemistry and Function 20, no. 1 (2002): 19–29. http://dx.doi.org/10.1002/cbf.931.

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Pasek, M. A., J. M. Sampson, and Z. Atlas. "Redox chemistry in the phosphorus biogeochemical cycle." Proceedings of the National Academy of Sciences 111, no. 43 (October 13, 2014): 15468–73. http://dx.doi.org/10.1073/pnas.1408134111.

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Sarsour, Ehab H., Amanda L. Kalen, and Prabhat C. Goswami. "Manganese Superoxide Dismutase Regulates a Redox Cycle Within the Cell Cycle." Antioxidants & Redox Signaling 20, no. 10 (April 2014): 1618–27. http://dx.doi.org/10.1089/ars.2013.5303.

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Foyer, Christine H., Michael H. Wilson, and Megan H. Wright. "Redox regulation of cell proliferation: Bioinformatics and redox proteomics approaches to identify redox-sensitive cell cycle regulators." Free Radical Biology and Medicine 122 (July 2018): 137–49. http://dx.doi.org/10.1016/j.freeradbiomed.2018.03.047.

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Hu, Min, Yuhong Zou, Shashank Manohar Nambiar, Joonyong Lee, Yan Yang, and Guoli Dai. "Keap1 modulates the redox cycle and hepatocyte cell cycle in regenerating liver." Cell Cycle 13, no. 15 (May 28, 2014): 2349–58. http://dx.doi.org/10.4161/cc.29298.

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Lau, Ka-Cheong, Ilya A. Shkrob, Nancy L. Dietz Rago, Justin G. Connell, Daniel Phelan, Bin Hu, Lu Zhang, Zhengcheng Zhang, and Chen Liao. "Improved performance through tight coupling of redox cycles of sulfur and 2,6-polyanthraquinone in lithium–sulfur batteries." Journal of Materials Chemistry A 5, no. 46 (2017): 24103–9. http://dx.doi.org/10.1039/c7ta08129d.

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Dissertations / Theses on the topic "Cycle redox"

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Formolo, Michael J. "The biogeochemical cycling of sulfur in two distinct redox regimes /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3164506.

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Vozniuk, Olena. "L’APPROCHE PAR CYCLE REDOX AU REFORMAGE DES BIOALCOOLS." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCM0002.

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Les recherches présentées dans cette thèse portent sur l'étude et l'évaluation d'un nouveau procédé de génération d'hydrogène. De nos jours, la production d'hydrogène est principalement basée sur le reformage du gaz naturel ou de naphta. Des procédés moins énergivores et plus durables pour la production d'hydrogène sont attractifs aussi bien pour l'industrie que pour les applications domestiques. Une voie très intéressante est le reformage de bio-alcools, en principe CO2-neutre. Des procédés de séparation coûteux peuvent être évités en séparant le procédé en deux étapes successives (combustion en boucle chimique), dans le but de réaliser deux flux séparés de H2 et de COx. De plus, un avantage supplémentaire en termes de durabilité est l'utilisation du bioéthanol comme source d'hydrogène, au lieu du gaz naturel.Le principe essentiel du cycle de boucle thermochimique est qu'un matériau de stockage d'oxygène est d'abord réduit par un courant d'éthanol, puis ré-oxydé par l'eau, afin de produire de l'hydrogène et de restaurer l'état d'oxydation d'origine du matériau en boucle.L’objectif initial du projet était de définir des conditions et des matériaux qui pourraient conduire à un processus optimisé, permettant de produire un flux d'hydrogène qui ne nécessite aucun traitement supplémentaire de purification ou de séparation. Différents oxydes mixtes de type spinelle modifiés TYPE I – MFe2O4 et TYPE II – M0,6Fe2,4Oy avec : (M = Cu, Co, Mn, Mg, Ca et Cu / Co, Cu / Mn, Co / Mn), en tant que matériaux potentiellement intéressants pour l’oxygène ionique et le bouclage de porteurs d'électrons, ont été préparés par co-précipitation et testés à la fois afin d’étudier leurs propriétés redox et de leur activité catalytique pour générer de l'hydrogène par oxydation à la vapeur d'eau, après une étape de réduction réalisée avec de l'éthanol. En particulier, nous nous sommes focalisés sur le comportement de réactivité des matériaux binaires/ternaires qui se traduit par leur capacité à former des oxydes de spinelle thermodynamiquement stables qui permettent de réobtenir la phase spinelle initiale lors du cycle et, à son tour, d'augmenter la stabilité du matériau en boucle par lui-même. De plus, ces travaux de recherche incluent des analyses DRIFTS in situ et des études XPS in situ qui ont permis d'extraire des informations au niveau moléculaire et de suivre les changements de surface dans les processus de réduction / réoxydation pendant le reformage d'éthanol en boucle chimique. Plusieurs caractérisations ont été effectuées à l'aide de techniques DRX, TPR / O, MET / MEB / EDS, mesures magnétiques et techniques spectroscopiques Raman / Mössbauer. De plus, nous avons effectué une modification du procédé CLR conventionnel avec l’addition d’une 3ème étape de régénération (réalisée avec de l'air) afin d'augmenter la stabilité du matériau en boucle et de résoudre les problèmes de désactivation tels que: dépôt / accumulation de coke et la réoxydation incomplète de M0 au cours de la 2ème étape
The current research is focused on the study and evaluation of a new process for the hydrogen generation. Nowadays, hydrogen production is mainly based on the reforming of natural gas or naphtha. Less energy intensive and more sustainable processes for hydrogen production are appealing for both industry and consumer applications. A highly attractive route is steam reforming of bio-alcohols, in principle CO2 neutral. Costly separation processes can be avoided by splitting the process into two alternated steps (chemical-loop reforming), in the aim of achieving two separate streams of H2 and COx. Moreover, an additional advantage in terms of sustainability is the use of bio-ethanol as the source of hydrogen, instead of natural gas.The main principle of the thermochemical-loop cycle is that an oxygen-storage material is first reduced by an ethanol stream, and then re-oxidized by water, in order to produce hydrogen and restore the original oxidation state of the looping-material.The initial task of the project was to define conditions and materials that may lead to an optimized process, allowing producing a hydrogen stream that does not require any additional purification or separation treatment. Different M-modified spinel-type mixed oxides: TYPE I – MFe2O4 and TYPE II – M0.6Fe2.4Oy viz. modified ferrospinels (where M=Cu, Co, Mn, Mg, Ca and Cu/Co, Cu/Mn, Co/Mn), as potentially attractive ionic oxygen and electron carrier looping materials, were prepared via co-precipitation method and tested in terms of both redox properties and catalytic activity to generate hydrogen by oxidation with steam, after a reductive step carried out with ethanol. Particularly, the focus on the reactivity behaviour of binary/ternary materials explained by their ability to form thermodynamically stable spinel oxides which allow us to re-obtain the initial spinel phase upon cycling and in turn increase the stability of looping material itself. In addition, the research includes in-situ DRIFTS and in-situ XPS studies that allowed to extract information at molecular level and to follow surface changes within the reduction/re-oxidation processes during ethanol chemical-loop reforming. Bulk characterizations have been done using XRD, TPR/O, TEM/SEM/EDS, Magnetic measurements and Raman/Mössbauer spectroscopic techniques. Moreover, a modification of the conventional CLR process with an addition of the 3rd regeneration step (carried out with air) was done in order to increase the stability of the looping material and to overcome the deactivation problems, such as: a coke deposition/accumulation and an incomplete re-oxidation of M0 during the 2nd step
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De, Simone Ambra. "Redox regulation of the cell cycle in Arabidopsis thaliana." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15788/.

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Seed germination is critical for plant establishment but little is known about how the reduction-oxidation (redox) environment of the cells in the emerging root meristem influences cell division. The glutathione redox potentials of the nuclei and cytosol were determined using redox-sensitive green fluorescent protein (roGFP2) in the Arabidopsis root apical meristem, in which cell cycle had been synchronised using hydroxyurea, within the period immediately after germination, in order to characterise the relationships between cellular redox status and cell cycle progression. The average glutathione redox potentials of the nuclei and cytosol were -297.5 mV ± 0.7 and -292.8 mV ± 0.6 respectively. However, a transient oxidation occurred in compartments during the G1 phase of the cell cycle, as determined by the expression of cell cycle markers (CYCB1;1-GUS, cytrap and cyclins). The effect of low antioxidant buffering capacity on the gene expression profiles of dry and imbibed seeds as well as the redox potentials of the nuclei and cytosol was determined using the ascorbate deficient vtc2-1 and vtc2-4 mutants. The glutathione redox potentials of the nuclei in the proliferation zone of vtc2-1 radicles expressing roGPF2 were -282.3 mV ± 0.5 and the cytosol was -282.9 mV ± 0.5. These increased levels of oxidation persisted throughout the period of measurement, a feature that was linked to changes in cell cycle progression. The transcriptome profiles of vtc2-1 and vtc2-4 dry seeds compared with that of wild-type seeds revealed large changes in the abundance of transcripts encoding transcription factors, redox components, and proteins involved in cell cycle and secondary metabolism. Fewer differences were shown for the transcriptome profiles of vtc2-1 and vtc2-4 imbibed seeds. Taken together these data show that antioxidant buffering capacity exerts a strong influence on cell cycle progression and gene expression without having marked effects on germination.
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Meier, Fabian. "Solar thermochemical cycle for ammonia production based on aluminium-based redox reactions." Zürich : Eidgenössische Technische Hochschule, 2007. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=310.

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Zhou, Ruixin. "SEMICONDUCTOR PHOTOCATALYSIS: MECHANISMS, PHOTOCATALYTIC PERFORMANCES AND LIFETIME OF REDOX CARRIERS." UKnowledge, 2017. http://uknowledge.uky.edu/chemistry_etds/85.

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Photocatalytic reactions mediated by semiconductors such as ZnS, TiO2, ZnO, etc. can harvest solar energy into chemical bonds, a process with important prebiotic and environmental chemistry applications. The recycling of CO2 into organic molecules (e.g., formate, methane, and methanol) facilitated by irradiated semiconductors such as colloidal ZnS nanoparticles has been demonstrated. ZnS can also drive prebiotic reactions from the reductive tricarboxylic acid (rTCA) cycle such as the reduction of fumarate to succinate. However, the mechanism of photoreduction by ZnS of the previous reaction has not been understood. Thus, this thesis reports the mechanisms for heterogeneous photocatalytic reductions on ZnS for two model reactions in water with sulfide hole scavenger. First the reduction of CO2 is carried out under variable wavelength of irradiation and proposed to proceed thorough five steps resulting in the exclusive formation of formate. Second the reduction of the double bond of fumaric acid to succinic acid is reported in detail and compared to the previous conversion of CO2 to formic acid. Both reactions are carried out under variable wavelength of irradiation and proposed to proceed thorough one electron transfer at a time. In addition, a new method to measure the bandgap of colloidal ZnS suspended in water is established. Furthermore, the time scales of electron transfer and oxidizing hole loss during irradiation of ZnS for both reactions are reported and interpreted in terms of the Butler-Volmer equation. The sunlight promoted production of succinate introduced above, provides a connection of this prebiotic chemistry work to explore if central metabolites of the rTCA cycle can catalyze the synthesis of clay minerals. Clay minerals are strong adsorbents that can retain water and polar organic molecules, which facilitate the polymerization of biomolecules and conversion of fatty acid micelles into vesicles under prebiotic conditions relevant to the early Earth. While typical clay formation requires high temperatures and pressures, this process is hypothesized herein to be accelerated by central metabolites. A series of synthesis are designed to last only 20 hours to study the crystallization of sauconite, an Al- and Zn-rich model clay, at low temperature and ambient pressure in the presence of succinate as a catalyst. Succinate promotes the formation of the trioctahedral 2:1 layer silicate at ≥ 75 °C, 6.5 ≤ pH ≤ 14, [succinate] ≥ 0.01 M. Cryogenic and conventional transmission electron microscopies, X-ray diffraction, diffuse reflectance Fourier transformed infrared spectroscopy, and measurements of total surface area and cation exchange capacity are used to study the time evolution during the synthesis of sauconite. While the studies with ZnS presented above advanced the fundamental understanding of photocatalysis with single semiconductors, the environmental applications of this material appear limited. A common limitation to photocatalysis with single semiconductors is the rapid recombination of photogenerated electron-hole pairs, which reduces significantly the efficiency of the process that in the case of ZnS also suffers from photocorrosion in the presence of air. In order to overcome the fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts, an effective strategy is developed in this work by combining two semiconductors into a nanocomposite. This nanocomposite is solvothermally synthesized creating octahedral cuprous oxide covered with titanium dioxide nanoparticles (Cu2O/TiO2). The nanocomposite exhibits unique surface modifications that provide a heterojunction with a direct Z-scheme for optimal CO2 reduction. The band structure of the nanocomposite is characterized by diffused reflectance UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy. The photoreduction of CO2(g) to CO(g) on the nanocomposite is investigated in the presence water vapor as the hole scavenger that generates the quantifiable hydroxyl radical (). The quantum efficiency of CO production under irradiation at λ ≥ 305 nm with the nanocomposite is 2-times larger than for pure Cu2O. The detection of and XPS analysis contrasting the stability of Cu2O/TiO2 vs Cu2O during irradiation prove that TiO2 prevents the photocorrosion of Cu2O. Overall, the studies of photocatalytic reductions on single component semiconductors reveal new knowledge needed for developing future photocatalytic application for fuel production, wastewater treatment, reducing air pollution, and driving important prebiotic chemistry reactions. Furthermore, the design of a photocatalyst operating under a Z-scheme mechanism provides a new proof of concept for the design of systems that mimic photosynthesis. Finally, this work also demonstrates how molecules obtained by mineral mediated photochemistry can catalyze clay formation; highlighting the important role that photochemistry may have played for the origin of life on the early Earth and other rocky planets.
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Di, Giacinto Nastasia <1987&gt. "Cysteine-Based Redox Modifications in the Regulation of Calvin-Benson Cycle Enzymes from Chlamydomonas Reinhartdtii." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7647/.

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In photosynthetic organisms the redox-dependent modification of thiols belonging to enzymes of the photosynthetic cycle, plays a prominent role in the regulation of metabolism and signalling. An important regulatory mechanism is represented by light that acts through a ferredoxin-thioredoxin system. The system permits the reduction/oxidation of disulfide bridges of the target enzymes. Moreover, cysteines residues can undergo other modifications such as glutathionylation and nitrosylation. Proteomic studies have allowed the identification of new putative targets of redox modifications, including Calvin Benson cycle enzymes. The aim of the studies was to investigate whether phosphoglycerate kinase, triose phosphate isomerase and glyceraldehyde-3-phosphate dehydrogenase from Chlamydomonas reinhardtii undergo redox modifications. All enzymes and their mutants (i.e. cysteines variants) were purified and the treatments with alkylating and oxidative agents have permitted to confirm the presence of reactive cysteine(s). The sensitivity of recombinant proteins to redox modifications and the cysteine(s) involved were analyzed by biochemical approcheas. The structural features were analyzed, and the crystallography structure of CrTPI and CrGPA were solved. The three enzymes result all redox regulated although with different biochemical features. The CrPGK contains two cysteines sensitive to redox treatments, although the inhibitor effects of these modifications are different, indeed glutathionylation slightly affected the enzymatic activity compare to nitrosylation. Moreover, the crystallographic structure of CrTPI was determined at a resolution of 1.1.Å, showing a homodimeric conformation containing the typical α/β- barrel fold. No evidence for CrTPI Trx-dependent regulation was obtained but was found to undergo glutathionylation and nitrosylation with a moderate down-regulation on activity. Furthermore, the CrGAPA shows an extreme sensitivity to oxidant molecules and the crystallographic structure of CrGAPA was determined at a resolution of 1.8.Å, confirming the tetrameric fold of the enzyme. the results suggest that redox modifications could constitute a mechanism for the regulation of the Calvin-Benson cycle under oxidative stress conditions.
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Thieulin, Pardo Gabriel. "Régulation d'enzymes du cycle de Calvin-Benson par une protéine intrinsèquement désordonnée, la CP12, chez Chlamydomonas reinhardtii." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4765.

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La phosphoribulokinase (PRK) et la glycéraldéhyde 3-phosphate déshydrogénase (GAPDH) sont deux enzymes-clés du cycle de Calvin-Benson. Leurs activités sont régulées par l’intermédiaire de la CP12, une protéine intrinsèquement désordonnée. Au cours de la transition lumière-obscurité, la GAPDH, la CP12 et la PRK forment un complexe supramoléculaire au sein duquel l’activité des enzymes est inhibée. Dans les travaux présentés ici, nous nous sommes intéressés à la formation de ce complexe et à la dynamique de ses composants. Nous avons montré pour la première fois que les résidus cystéine Cys243 et Cys249 de la PRK sont essentiels à la formation du complexe GAPDH-CP12-PRK et qu’ils peuvent former un pont disulfure en présence de CP12. Nous avons également étudié la dynamique de la CP12 en présence de ses partenaires, et observé que la CP12 adopte une conformation beaucoup plus compacte en présence de GAPDH et de PRK. La glutathionylation (formation d’un pont disulfure mixte entre une molécule de glutathion et un résidu cystéine appartenant à une protéine) est une modification post-traductionnelle associée au stress oxydant qui affecte dix enzymes du cycle de Calvin-Benson, y compris la GAPDH et la PRK. Nous avons étudié l’impact de la glutathionylation sur ces enzymes, et montré que l’inactivation de la PRK naît de l’encombrement du site de fixation de l’ATP.Enfin, la dernière partie de ces travaux est centrée sur l’adénylate kinase 3 de C. reinhardtii, une enzyme impliquée dans le métabolisme de l’ATP et qui possède une extension similaire à la CP12. Cette première étude montre que cette extension augmente la stabilité de l’ADK 3 et intervient dans sa glutathionylation
Phosphoribulokinase (PRK) and glyceraldehyde 3-phosphate dehydrogenase (GAPDH) are two key enzymes of the Calvin-Benson and their activities are redox-regulated through the intervention of CP12, a intrinsically disordered protein. During the light-to-dark transitions, GAPDH, CP12 and PRK form a supramolecular complex in which the enzymes are strongly inhibited; this complex is dissociated during the dark-to-light transition and the active enzymes are released.In the work presented here, we studied the formation of the complex and the dynamics of its components. For the first time, we showed that two cysteine residues of PRK, Cys243 and Cys249, are essential to the assembly of the GAPDH-CP12-PRK complex, and can form a disulfide bridge in presence of CP12.Glutathionylation (the formation of a mixed disulfide bridge linking one glutathione molecule and a cysteine residue from a protein) is a post-translational modification associated with oxidative stress that affects ten of the Calvin-Benson enzymes, including GAPDH and PRK, and we show that the inactivation of PRK by glutathionylation is caused by the blockage of the ATP binding site by glutathione.The last part of this work is centered around adenylate kinase 3 from C. reinhardtii, an enzyme tied to the energetic metabolism of the cells that presents a CP12-like C-terminal extension. Our results suggest that this CP12-like “tail” improve the stability of ADK 3 and participates in tis glutathionylation
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Hischier, Illias. "CO₂ splitting via a solar thermochemical cycle based on Zn/ZnO redox reactions: thermodynamic and kinetic analysis." Zürich : ETH, Swiss Federal Institute of Technology Zurich, Institute of Energy Technology, 2008. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=360.

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Cassagnes, Laure-Estelle. "Cycle redox quinone-quinone réductase 2 et conséquences sur la production d'espèces oxygénées réactives dans le contexte cellulaire." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30148/document.

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La quinone réductase 2 ou QR2 est une enzyme qui, comme son homologue QR1, joue un rôle de détoxification des quinones, molécules fortement réactives, en les réduisant en hydroquinones. Cependant, il a été observé au niveau cellulaire et tissulaire que l'activité de cette flavoprotéine pouvait avoir des effets délétères en déclenchant une surproduction d'espèces réactives de l'oxygène (ROS). D'autre part, on observe une surexpression ou une sous expression de QR2 dans certaines maladies neurodégénératives comme la maladie de Parkinson et la maladie d'Alzheimer. Dans ce contexte, ce travail a porté sur l'étude des espèces oxygénées réactives produites lors du cycle redox quinone / QR2 et leurs variations en fonction de la nature de la quinone, sur protéine purifiée et sur modèles cellulaires comparativement à QR1. Les propriétés d'oxydo-réduction des substrats, co-substrats et inhibiteurs de QR2 étudiées par électrochimie ont permis de les classer en fonction de leur capacité à être réduits. L'activité enzymatique de la protéine, qu'elle soit purifiée ou intracellulaire, a été suivie par différentes méthodologies (résonance paramagnétique électronique, spectroscopie UV-visible et de fluorescence, U(H)PLC-MS, microscopie confocale de fluorescence). La production du radical superoxyde est observée en présence de lignées cellulaires surexprimant ou non QR1 et QR2. Les quinones sont réduites enzymatiquement pour donner des hydroquinones via l'activité des quinones réductases (QR1 et QR2) et des semiquinones via l'activité de réductases à un électron (CytP540 réductase par exemple). La réoxydation de ces produits est responsable d'une production plus ou moins forte de radicaux superoxydes selon la structure initiale de la quinone et l'affinité pour les différentes réductases. La ménadione provoque une production cellulaire de superoxyde plus importante en l'absence de QR1 et QR2. Ces analyses ont également démontré que, comme son homologue QR1, QR2 est capable de réduire les ortho-quinones dont certaines catécholquinones (aminochrome, dopachrome, adrénochrome) reconnues pour leur toxicité neuronale
Quinone reductase 2 or QR2 is an enzyme that, like its counterpart QR1, plays a role in detoxification of the highly reactives quinones by reducing them into hydroquinones. On one hand, it has been observed at the cellular and tissue level that the activity of this flavoprotein could have deleterious effects by triggering an overproduction of reactive oxygen species (ROS). On the other hand, overexpression or under expression of QR2 has been observed in some neurodegenerative diseases such as Parkinson's disease and Alzheimer's disease. In this context, this work focused on the study of reactive oxygen species produced during the quinone / QR2 redox cycle and their variations depending on the nature of the quinone, on both purified protein and cell models, in comparison to QR1. The redox properties of the substrates, co-substrates and inhibitors ok QR2 studied by electrochemistry allowed to classify them according to their capacity to be reduced. The enzymatic activity of the protein, either purified or intracellular, was followed by various methodologies (electron paramagnetic resonance, UV-visible and fluorescence spectroscopy, U(H)PLC-MS, confocal fluorescence microscopy). Production of superoxide radical is observed in the presence of cell lines overexpressing or not QR1 and QR2. Quinones are reduced enzymatically to form hydroquinones via the activity of quinone reductase (QR1 and QR2) and semiquinone via the activity of one electron reductases (e.g. CytP540 reductase). Reoxidation of these products is responsible for a greater or lesser production of the superoxide radical, according to the initial structure of the quinone and the affinity for different reductases. Menadione causes a higher production of cellular superoxide in the absence of QR1 and QR2. These analyzes have also shown that, like its counterpart QR1, QR2 is capable of reducing ortho-quinones including catecholquinones (aminochrome, dopachrome, adrenochrome) known for their neuronal toxicity
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Mallery, Susan Regina. "Association of cellular thiol redox status with mitogen-induced calcium mobilization and cell cycle progression in human fibroblasts /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487683049378343.

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Books on the topic "Cycle redox"

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Karle, Ida-Maja. On redox reactions and transport processes of solutes in coastal marine sediments. [Göteborg]: Analystical and Marine Chemistry, Dept. of Chemistry, Göteborg University, 2006.

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Book chapters on the topic "Cycle redox"

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Lloyd, David, and Douglas B. Murray. "Redox Cycling of Intracellular Thiols: State Variables for Ultradian, Cell Division Cycle and Circadian Cycles?" In The Redox State and Circadian Rhythms, 85–94. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9556-8_5.

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Foyer, Christine H., Till K. Pellny, Vittoria Locato, and Laura Gara. "Analysis of Redox Relationships in the Plant Cell Cycle: Determinations of Ascorbate, Glutathione and Poly (ADPribose) Polymerase (PARP) in Plant Cell Cultures." In Redox-Mediated Signal Transduction, 193–209. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-129-1_14.

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Foyer, Christine H., Till K. Pellny, Vittoria Locato, Jonathon Hull, and Laura De Gara. "Analysis of Redox Relationships in the Plant Cell Cycle: Determination of Ascorbate, Glutathione, and Poly(ADPribose)polymerase (PARP) in Plant Cell Cultures." In Redox-Mediated Signal Transduction, 165–81. New York, NY: Springer US, 2019. http://dx.doi.org/10.1007/978-1-4939-9463-2_14.

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Masi, Antonio. "Gamma-Glutamyl Cycle in Plants: Possible Implications in Apoplastic Redox Control and Redox Sensing." In Sulfur Metabolism in Plants, 249–54. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4450-9_30.

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Zagorchev, Lyuben, Denitsa Teofanova, and Mariela Odjakova. "Ascorbate–Glutathione Cycle: Controlling the Redox Environment for Drought Tolerance." In Drought Stress Tolerance in Plants, Vol 1, 187–226. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28899-4_8.

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Weiss, Alvin H., John Cook, Richard Holmes, Natka Davidova, Pavlina Kovacheva, and Maria Traikova. "Redox Cycle During Oxidative Coupling of Methane over PbO—MgO—Al2O3Catalyst." In Novel Materials in Heterogeneous Catalysis, 243–53. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0437.ch022.

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L’Abbate, Pasqua, Michele Dassisti, and Abdul G. Olabi. "Small-Size Vanadium Redox Flow Batteries: An Environmental Sustainability Analysis via LCA." In Life Cycle Assessment of Energy Systems and Sustainable Energy Technologies, 61–78. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93740-3_5.

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Loutzenhiser, Peter G., Anton Meier, Daniel Gstoehl, and Aldo Steinfeld. "CO2Splitting via the Solar Thermochemical Cycle Based on Zn/ZnO Redox Reactions." In ACS Symposium Series, 25–30. Washington, DC: American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1056.ch003.

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Kuźniak, Elżbieta. "The Ascorbate–Gluathione Cycle and Related Redox Signals in Plant–Pathogen Interactions." In Ascorbate-Glutathione Pathway and Stress Tolerance in Plants, 115–36. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9404-9_4.

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Hall, Michael, Wolfgang P. Schröder, and Thomas Kieselbach. "Thioredoxin Interactions of the Chloroplast Lumen of Arabidopsis thaliana Indicate a Redox Regulation of the Xanthophyll Cycle." In Photosynthesis. Energy from the Sun, 1099–102. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6709-9_240.

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Conference papers on the topic "Cycle redox"

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Faes, Antonin, Henrik Lund-Frandsen, Mikko Pihlatie, Andreas Kaiser, and Darlene R. Goldstein. "Curvature and Strength of Ni-YSZ Solid Oxide Half-Cells After RedOx Treatments." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85118.

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One of the main drawbacks of anode-supported solid oxide fuel cell technology is the limited capability to withstand reduction and oxidation (“RedOx”) of the Ni phase. This study compares the effect of RedOx cycles on curvature and strength of half-cells, composed of a Ni-YSZ support, a Ni-YSZ anode and an 8YSZ electrolyte. Five different treatments were studied: (i) reduction at 600°C, (ii) reduction at 1000°C, (iii) 1 RedOx cycle at 750°C, (iv) 5 RedOx cycles at 750°C and (v) 5 RedOx cycles at 600°C. The strength was measured by the ball-on-ring method, where it is calculated analytically from the force. In this calculation the thermal stresses have been estimated from the curvature of the half-cell. For each treatment, more than 30 samples were tested. About 20 ball-on-ring samples were laser cut from one original 12×12 cm2 half-cell. Curvature and porosity were measured for each sample before and after RedOx treatments. The first observations show that increasing the reduction temperature enhance strength but does not influence the curvature, whereas 1 RedOx cycle at 750°C increases the curvature without changing the strength. Consecutive RedOx cycles seem to decrease anode-supported cell strength, but this is coupled to lower porosity of the sample.
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Bhosale, Rahul Rambhau, Anand Kumar, Fares Almomani, Ujjal Ghosh, Ivo Alxneit, Jonathan Scheffe, and Shiva Yousefi. "Solar Thermochemical CO 2 Utilization via Ceria Based Redox Cycle." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2016. http://dx.doi.org/10.5339/qfarc.2016.eepp3266.

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Shafirovich, Evgeny, and Allen Garcia. "Thermodynamic Analysis of CO2 Reduction in the SnO2/SnO Solar Thermochemical Cycle." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54731.

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CO2 utilization for the production of valuable chemical products may help mitigate two global problems: increasing CO2 concentration in the atmosphere and depleting petroleum resources. Solar thermochemical cycles for CO2 splitting provide relatively high efficiencies of solar energy conversion while operating at realistic temperatures. In the present paper, the cycles proposed previously are reviewed and a novel cycle, based on SnO2/SnO redox reactions, is proposed. The results of thermodynamic calculations for the CO2 reduction step in this cycle are reported.
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Abernathy, Macon, and Samantha Ying. "The Vanadium Redox Cycle: Biological and Mineralogical Considerations in Diffusion-Limited Environments." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.6.

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Kodama, Tatsuya, Nobuki Imaizumi, Nobuyuki Gokon, Tsuyoshi Hatamachi, Daiki Aoyagi, and Ken Kondo. "Comparison Studies of Reactivity on Nickel-Ferrite and Cerium-Oxide Redox Materials for Two-Step Thermochemical Water Splitting Below 1400°C." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54277.

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A two-step thermochemical water splitting cycle using a redox system of non-volatile metal oxide is one of the promising processes for converting concentrated solar high-temperature heat into clean hydrogen in sun-belt regions. In the 1st step of the cycle or the thermal reduction step, metal oxide is thermally reduced to release oxygen molecules in an inert gas atmosphere at a higher temperature above 1400°C. In the second step or the water-decomposition step at a lower temperature, the thermally-reduced metal oxide reacts with steam to produce hydrogen. As the reactive redox metal oxide materials to be capable of working below 1400°C, nickel-doped iron oxides or Ni-ferrites supported on zirconia, and non-stoichiometric cerium oxides are the promising working materials. In the present work, a series of the nickel-ferrite redox materials of monoclinic-zirconia-supported, cubic-YSZ(yttrium-stabilized zirconia)-supported, and non-supported Ni-ferries and non-stoichiometric cerium oxide were compared on reactivity for two-step thermochemical water splitting cycle. The monoclinic-zirconia-supported Ni-ferrite produced the most quantity of hydrogen in the repeated cycles when the thermal reduction step was performed for 30 min at 1400°C and the water decomposition step for 60 min at 1000°C.
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Roeb, Martin, Christian Sattler, Ruth Klu¨ser, Nathalie Monnerie, Lamark de Oliveira, Athanasios G. Konstandopoulos, Christos Agrafiotis, et al. "Solar Hydrogen Production by a Two-Step Cycle Based on Mixed Iron Oxides." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76126.

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A very promising method for the conversion and storage of solar energy into a fuel is the dissociation of water to oxygen and hydrogen, carried out via a two-step process using metal oxide redox systems such as mixed iron oxides, coated upon multi-channeled honeycomb ceramic supports capable of absorbing solar irradiation, in a configuration similar to that encountered in automobile exhaust catalytic converters. With this configuration, the whole process can be carried out in a single solar energy converter, the process temperature can be significantly lowered compared to other thermo-chemical cycles and the re-combination of oxygen and hydrogen is prevented by fixing the oxygen in the metal oxide. For the realization of the integrated concept, research work proceeded in three parallel directions: synthesis of active redox systems, manufacture of ceramic honeycomb supports and manufacture, testing and optimization of operating conditions of a thermochemical solar receiver-reactor. The receiver-reactor has been developed and installed in the solar furnace in Cologne, Germany. It was proven that solar hydrogen production is feasible by this process demonstrating that multi cycling of the process was possible in principle.
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de la Calle, Alberto, and Alicia Bayon. "Annual Performance of a Solar-Thermochemical Hydrogen Production Plant Based on CeO2 Redox Cycle." In The 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017. Linköping University Electronic Press, 2017. http://dx.doi.org/10.3384/ecp17132857.

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Hankins, Phillip T., Hargsoon Yoon, and Vijay K. Varadan. "Cylindrical nanocavity and nanowire electrodes for redox cycle dopamine sensing: design, fabrication, and characterization." In The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Vijay K. Varadan. SPIE, 2007. http://dx.doi.org/10.1117/12.717665.

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Neises, Martina, Heike Simon, Martin Roeb, Martin Schmu¨cker, Christian Sattler, and Robert Pitz-Paal. "Investigations of the Regeneration Step of a Thermochemical Cycle Using Mixed Iron Oxides Coated on SiSiC Substrates." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54193.

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A two-step thermochemical cycle for hydrogen production using mixed iron oxides coated on silicon carbide substrates has been investigated. The water-splitting step proceeds at temperatures between 800 and 1000 °C while for the regeneration step temperatures around 1200 °C are needed. A deactivation of the material resulting in a decrease of the hydrogen production within the first couple of cycles was observed in preceding tests. For detailed investigations of the system composed of the redox-material and the substrate small scale samples were tested in a laboratory test-rig. For identification of material changes the samples were investigated via XRD and SEM-EDS analysis. The analysis revealed the reasons for the deactivation of the redox-material. Through parametric studies the influence of the regeneration parameters, namely regeneration temperature and time on the hydrogen production was analysed. A model for the regeneration step was developed describing the performance of the regeneration step as a function of temperature and time and additionally as a function of total regeneration time, i.e. the cumulated time the sample has been regenerated.
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Krenzke, Peter, and Jane Davidson. "Thermodynamic Analysis of the Ceria Redox Cycle With Methane-Driven Reduction for Solar Fuel Production." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6332.

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The nonstoichiometric cerium oxide (ceria) redox cycle is an attractive pathway for storing energy from concentrated sunlight in chemical bonds by splitting water and carbon dioxide. The endothermic reduction reaction (R1)CeO2-δox→CeO2-δed+Δδ2O2 is favored thermodynamically at high temperatures and low oxygen partial pressures, while the CO2 and H2O splitting reactions (R2, R3) are exothermic and favored at lower temperatures and higher oxygen partial pressures. The produced hydrogen and carbon monoxide, referred to collectively as syngas, are important feedstocks used in the synthesis of ammonia and liquid fuels.(R2)CeO2-δed+ΔδCO2→CeO2-δox+ΔδCO (R3)CeO2-δed+ΔδH2O→CeO2-δox+ΔδH2
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Reports on the topic "Cycle redox"

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Davidson, Jane, Thomas Chase, and Sossina Haile. Solar Fuels via Partial Redox Cycles With Heat Recovery. Office of Scientific and Technical Information (OSTI), August 2015. http://dx.doi.org/10.2172/1212300.

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