Готові списки джерел за темами / Membrane d’échangeuse de protons

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Добірка наукової літератури з теми "Membrane d’échangeuse de protons"

Автор: Grafiati
Опубліковано: 19 жовтня 2024
Оновлено: 31 липня 2025

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Статті в журналах з теми "Membrane d’échangeuse de protons"

1

Sokolov, Valerij S., Vsevolod Yu Tashkin, Darya D. Zykova, Yulia V. Kharitonova, Timur R. Galimzyanov, and Oleg V. Batishchev. "Electrostatic Potentials Caused by the Release of Protons from Photoactivated Compound Sodium 2-Methoxy-5-nitrophenyl Sulfate at the Surface of Bilayer Lipid Membrane." Membranes 13, no. 8 (2023): 722. http://dx.doi.org/10.3390/membranes13080722.

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Lateral transport and release of protons at the water–membrane interface play crucial roles in cell bioenergetics. Therefore, versatile techniques need to be developed for investigating as well as clarifying the main features of these processes at the molecular level. Here, we experimentally measured the kinetics of binding of protons released from the photoactivated compound sodium 2-methoxy-5-nitrophenyl sulfate (MNPS) at the surface of a bilayer lipid membrane (BLM). We developed a theoretical model of this process describing the damage of MNPS coupled with the release of the protons at the
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2

Ababneh, Omar, Abdallah Barjas Qaswal, Ahmad Alelaumi, et al. "Proton Quantum Tunneling: Influence and Relevance to Acidosis-Induced Cardiac Arrhythmias/Cardiac Arrest." Pathophysiology 28, no. 3 (2021): 400–436. http://dx.doi.org/10.3390/pathophysiology28030027.

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Acidosis and its associated pathologies predispose patients to develop cardiac arrhythmias and even cardiac arrest. These arrhythmias are assumed to be the result of membrane depolarization, however, the exact mechanism of depolarization during acidosis is not well defined. In our study, the model of quantum tunneling of protons is used to explain the membrane depolarization that occurs during acidosis. It is found that protons can tunnel through closed activation and inactivation gates of voltage-gated sodium channels Nav1.5 that are present in the membrane of cardiac cells. The quantum tunne
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3

Weichselbaum, Ewald, and Peter Pohl. "Protons at the membrane water interface." Biochimica et Biophysica Acta (BBA) - Bioenergetics 1859 (September 2018): e117. http://dx.doi.org/10.1016/j.bbabio.2018.09.346.

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4

Rayabharam, Archith, and N. R. Aluru. "Quantum water desalination: Water generation through separate pathways for protons and hydroxide ions in membranes." Journal of Applied Physics 132, no. 19 (2022): 194302. http://dx.doi.org/10.1063/5.0122324.

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Much of the water desalination strategies has focused on designing pores and membranes that transport water and reject ions and other molecules at a high rate. In this paper, we discuss an approach where protons (H+) and hydroxide (OH−) ions are transported via different mechanisms through a porous membrane, and subsequently, once they have been transported through the membrane, they recombine to generate water. 2D materials such as graphene and MoS2 have generated significant interest for applications such as desalination. Here, we explore the applicability of one such 2D material—a cubic Ti2
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5

Farahani, Ramin M. "An Addendum to the Chemiosmotic Theory of Mitochondrial Activity: The Role of RNA as a Proton Sink." Biomolecules 15, no. 1 (2025): 87. https://doi.org/10.3390/biom15010087.

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Mitochondrial ATP synthesis is driven by harnessing the electrochemical gradient of protons (proton motive force) across the mitochondrial inner membrane via the process of chemiosmosis. While there is consensus that the proton gradient is generated by components of the electron transport chain, the mechanism by which protons are supplied to ATP synthase remains controversial. As opposed to a global coupling model whereby protons diffuse into the intermembrane space, a localised coupling model predicts that protons remain closely associated with the lipid membrane prior to interaction with ATP
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6

Abdallat, Mahmoud, Abdallah Barjas Qaswal, Majed Eftaiha, et al. "A mathematical modeling of the mitochondrial proton leak via quantum tunneling." AIMS Biophysics 11, no. 2 (2024): 189–233. http://dx.doi.org/10.3934/biophy.2024012.

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<abstract> <p>The mitochondrion is a vital intracellular organelle that is responsible for ATP production. It utilizes both the concentration gradient and the electrical potential of the inner mitochondrial membrane to drive the flow of protons from the intermembrane space to the matrix to generate ATP via ATP-synthase. However, the proton leak flow, which is mediated via the inner mitochondrial membrane and uncoupling proteins, can reduce the efficiency of ATP production. Protons can exhibit a quantum behavior within biological systems. However, the investigation of the quantum be
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7

Keller, David, Seema Singh, Paola Turina, Roderick Capaldi, and Carlos Bustamante. "Structure of ATP synthase by SFM and single-particle image analysis." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 722–23. http://dx.doi.org/10.1017/s0424820100139986.

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F1Fo ATP synthases are the proteins responsible for the synthesis of ATP in oxidative phosphorylation, and are present in some form in all aerobic organisms, both prokaryotic and eukaryotic. They use the energy stored in a transmembrane proton gradient (which is generated by other members of the oxidative phosphorylation pathway) to synthesize ATP from ADP and Pi or, working in reverse, to pump protons across the membrane using the energy of ATP hydrolysis. The full protein has two sectors, F1 and Fo. F1 is normally bound to Fo (which is membrane integrated), but is water soluble when dissocia
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8

Bramhall, John. "Conductance routes for protons across membrane barriers." Biochemistry 26, no. 10 (1987): 2848–55. http://dx.doi.org/10.1021/bi00384a028.

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9

M., Ambaga, Tumen-Ulzii A., and Buyantushig T. "THE BUFFERING CAPACITY OF ERYTHROCYTE MEMBRANE SURROUNDINGS IN RELATION TO FREE PROTONS INSIGHTOF NEW ELUCIDATION OF EIGTH AND NINTH STAGES OF THE MEMBRANE REDOXY POTENTIAL THREE STATE DEPENDENT 9 STEPPED FULL CYCLE OF PROTON CONDUCTANCE IN THE HUMAN BODY." International Journal of Advanced Research 10, no. 11 (2022): 29–33. http://dx.doi.org/10.21474/ijar01/15638.

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It was became clear that the flow-fate of all many many protons,generated in mitochondria of 50-80 trillion cells (now by us mitochondria flow of protons named as 1-7 stages of proton conductance) have been needed another special structures - another system needs to soak up the extra H+ activity generated as a result of process conducted in the 1-7 stages of proton conductance in order for true buffering to occur, that system consists of intracellular proteins, of which haemoglobin is the key player, concretely speaking,one of these are the erythrocyte membrane surroundings for packaging of pr
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Vidilaseris, Keni, Juho Kellosalo, and Adrian Goldman. "A high-throughput method for orthophosphate determination of thermostable membrane-bound pyrophosphatase activity." Analytical Methods 10, no. 6 (2018): 646–51. http://dx.doi.org/10.1039/c7ay02558k.

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Membrane-bound pyrophosphatases (mPPases) are homodimeric integral membrane proteins that hydrolyse pyrophosphate into orthophosphates coupled to the active transport of protons or sodium ions across membranes.
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Дисертації з теми "Membrane d’échangeuse de protons"

1

Ebrahimi, Mohammad. "Hybrid membranes based on iοnic liquids for application in fuel cells". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR029.

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Анотація:
La pile à combustible à membrane échangeuse de protons (PEMFC) suscite beaucoup d’intérêts dans le milieu académique et dans l’industrie, puisqu’ elle est considérée comme une source d’énergie verte. La membrane électrolytique polymère (PEM), responsable du transport des protons entres les électrodes, est la partie la plus importante de la PEMFC. Le Nafion® est le polymère le plus couramment utilisé en tant que PEM du fait de ses bonnes stabilités thermique, mécanique et chimique ainsi qu'une conductivité ionique élevée. Ce polymère présente d’excellentes performances à des températures inféri
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2

Nabil, Yannick. "Supports de Catalyseur Nanostructurés pour Pile à Combustible à Membrane Échangeuse de Protons." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0029/document.

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Анотація:
La durabilité des piles à combustible à membrane échangeuse de proton (PEMFC) est un des verrous technologiques majeurs qui freinent leurs implantations sur le marché. Ces travaux de thèse s’inscrivent dans ce contexte en proposant l’élaboration de matériaux en carbure de niobium comme support de catalyseur pour remplacer les supports carbonés actuellement utilisés dans les cathodes de PEMFC. Notre démarche est d’associer cette composition à différentes morphologies contrôlées pour développer des matériaux conducteurs, présentant une porosité adaptée et chimiquement plus stable que le carbone
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3

Ion, Mihaela Florentina. "Proton transport in proton exchange membrane fuel cells /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3164514.

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4

SANTORO, THAIS A. de B. "Estudo tecnologico de celulas a combustivel experimentais a membrana polimerica trocadora de protons." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11174.

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Made available in DSpace on 2014-10-09T12:49:10Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:00:37Z (GMT). No. of bitstreams: 1 09831.pdf: 4253435 bytes, checksum: c758abc7c04ca544bdc0f231316160f0 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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5

Cognard, Gwenn. "Electrocatalyseurs à base d’oxydes métalliques poreux pour pile à combustible à membrane échangeuse de protons." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI007.

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Анотація:
Les électrocatalyseurs conventionnels utilisés dans les piles à combustibles à membrane échangeuse de protons (PEMFC) sont composés de nanoparticules de platine supportées sur des noirs de carbone de forte surface spécifique. A la cathode de la PEMFC, siège de la réaction de réduction de l’oxygène (ORR), le potentiel électrochimique peut atteindre des valeurs élevées - notamment lors de phases arrêt-démarrage - engendrant des dégradations irréversibles du support carboné. Une solution « matériaux » consiste à remplacer ce dernier par des supports à base d’oxydes métalliques. Ceux-ci doivent êt
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6

Bultel, Yann. "Modélisation des couches actives d'électrodes volumiques de piles à combustible à membrane échangeuse de protons." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0054.

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Анотація:
Ce travail est focalise sur la modelisation des transports de matiere, de charge et de chaleur dans les couches actives des electrodes volumiques de piles a combustible a membrane echangeuse de protons (p. E. M. F. C). Un premier temps decrit la structure des piles a combustible et les processus physico-chimiques aux electrodes sont decrits. Une analyse des modeles classiques rencontres dans la litterature montre qu'ils supposent tous que l'electrocatalyseur est uniformement reparti sur un plan ou en volume. Dans un deuxieme temps, la modelisation des phenomenes de transport de matiere et de c
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7

Toudret, Pierre. "Compréhension et optimisation des couches actives de pile à combustible à membrane échangeuse de protons." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI124.

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Анотація:
La pile à combustible à membrane échangeuse de protons (PEMFC) est un convertisseur électrochimique qui produit un courant électrique, de la chaleur et de l'eau à partir de l'oxydation de l'hydrogène et de la réduction de l'oxygène. Cette technologie performante et non émettrice d'émissions de gaz à effet de serre est un candidat prometteur pour réduire les émissions de CO2, en particulier dans les applications de transport lourd (camion, bus, ...). Les couches actives sont le siège des réactions électrochimiques et donc les électrodes de la PEMFC. Elles régissent les performances, le coût et
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8

Zhao, Zuzhen. "Détermination des mécanismes de dégradation d'électrodes modèles de pile à combustible à membrane échangeuse de protons." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00764891.

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Анотація:
Ce travail de thèse s'est intéressé aux mécanismes de dégradation de nanoparticules de Pt supportées sur carbone utilisées pour catalyser les réactions électrochimiques dans une pile à combustible à membrane échangeuse de protons (PEMFC) et à leur conséquences d'un point de vue cinétique. Nous avons mis en évidence les différents mécanismes (maturation d'Ostwald 3D, corrosion du support carboné, migration/agrégation des cristallites métalliques) conduisant à une perte de surface active électrochimiquement et avons trouvé des conditions permettent d'isoler chacun de ces mécanismes. En premier l
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9

Dijoux, Étienne. "Contrôle tolérant aux défauts appliqué aux systèmes pile à combustible à membrane échangeuse de protons (pemfc)." Thesis, La Réunion, 2019. http://www.theses.fr/2019LARE0008/document.

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Анотація:
La pile à combustible apparaît comme un système performant pour produire de l’électricité « verte » à partir de l’hydrogène dès lors que celui-ci est produit à partir de sources d’énergie renouvelables. Les avantages et la maturité de la technologie à membrane polymère font des PEMFC des candidates prometteuses. Cependant, plusieurs verrous scientifiques et technologiques limitent encore leur utilisation à grande échelle, en particulier leur coût, leur fiabilité et leur durée de vie. L’amélioration de ces caractéristiques passe par la mise en place d’outils de supervision, de détection de défa
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10

Gloaguen, Frédéric. "Piles à combustible à membrane échangeuse de protons : contribution à l'étude de la cathode à oxygène." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0105.

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Le but de ce travail est de minimiser la quantite de platine dans les cathodes a oxygene des piles a combustible envisagees pour les vehicules electriques. La premiere partie de ce memoire comprend une etude bibliographique des piles a combustible a membrane echangeuse de protons (pemfc), ainsi qu'une presentation des principaux resultats concernant la reduction electrochimique de l'oxygene sur platine massif et disperse. Differents modeles, decrivant le fonctionnement des couches actives des electrodes de piles a combustible, sont ensuite etudies. Des applications numeriques au cas de la cath
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Книги з теми "Membrane d’échangeuse de protons"

1

Karlsson, Jenny. Functional and structural analysis of the membrane domain of proton-translocating Escherichia coli Transhydrogenase. Department of Chemistry, Biochemistry and Physices, Göteborg University, 2006.

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2

Lester, Packer, ed. Biomembranes.: Structure and translocation. Academic Press, 1986.

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3

Herring, Andrew M. Fuel cell chemistry and operation. American Chemical Society, 2010.

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4

1964-, Li Hui, ed. Proton exchange membrane fuel cells: Contamination and mitigation strategies. Taylor & Francis, 2010.

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5

P, Wilkinson David, ed. Proton exchange membrane fuel cells: Materials properties and performance. Taylor & Francis, 2010.

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6

Spiegel, Colleen. PEM fuel cell modeling and simulation using Matlab. Academic Press/Elsevier, 2008.

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7

Spiegel, Colleen. PEM fuel cell modeling and simulation using Matlab. Academic Press/Elsevier, 2008.

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8

Spiegel, Colleen. PEM fuel cell modeling and simulation using Matlab. Academic Press/Elsevier, 2008.

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9

Qi, Zhigang. Proton Exchange Membrane Fuel Cells. Taylor & Francis Group, 2017.

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10

Qi, Zhigang. Proton Exchange Membrane Fuel Cells. Taylor & Francis Group, 2013.

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Частини книг з теми "Membrane d’échangeuse de protons"

1

Alhazov, Artiom. "Number of Protons/Bi-stable Catalysts and Membranes in P Systems. Time-Freeness." In Membrane Computing. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11603047_6.

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2

Casadio, Rita, Giovanni Venturoli, and B. Andrea Melandri. "The Determination of the Electrochemical Potential Difference of Protons in Bacterial Chromatophores." In Recent Advances in Biological Membrane Studies. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-4979-2_24.

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3

Barr, R., and F. L. Crane. "Are Plasmalemma Redox Protons Involved in Growth Control by Plant Cells?" In Plasma Membrane Oxidoreductases in Control of Animal and Plant Growth. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-8029-0_52.

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4

Li, Youze, Zhengping Ma, and Shaolong Wu. "Studies on the Role of Thylakoid Membrane-Localized Protons in ATP Synthesis." In Current Research in Photosynthesis. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_461.

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5

Brand, Martin D. "Measurement of mitochondrial protonmotive force." In Bioenergetics. Oxford University PressOxford, 1995. http://dx.doi.org/10.1093/oso/9780199634897.003.0003.

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Abstract Protonmotive force is the central intermediate in bioenergetics. Mitochondria normally produce it by pumping protons from the mitochondrial matrix across the inner membrane during electron transport. Protonmotive force drives the synthesis of ATP by the ATP synthase as well as several other important bioenergetic reactions such as ion transport, transhydrogenation, and proton leak-mediated heat production.
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6

Prebble, John, and Bruce Weber. "The Cytochrome Oxidase Controversy 1977-1986." In Wanderind in the Gardens of the Mind. Oxford University PressNew York, NY, 2003. http://dx.doi.org/10.1093/oso/9780195142662.003.0011.

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Abstract Mitchell was involved in many controversies. That concerning the cytochronw oxidase&amp;gt; was certainly a major one and throws light on his personality and on his approach to science. lt also provides a window on the nature of scientific debate. ln the late 197us, a major public argtmwnt with a Finnish biochemist developed ove’f an aspe’ct of the chemiosmotic theory. The question under debate, whether or not protons were pumped by the cytochrome oxidase (the terminal enzyme of the respiratory chain that reduces oxygen to water), was related to the more diffuse argument over the numb
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7

Gutman, Menachem, Esther Nachliel, and Yossi Tsfadia. "Propagation of Protons at the Water Membrane Interface Microscopic Evaluation of a Macroscopic Process." In Permeability and Stability of Lipid Bilayers. CRC Press, 2017. http://dx.doi.org/10.1201/9780203743805-12.

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8

Charlene, Pillay, Ramdhani Nishani, and Singh Seema. "The Use of Plant Secondary Metabolites in the Treatment of Bacterial Diseases." In Therapeutic Use of Plant Secondary Metabolites. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050622122010010.

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Plants produce an array of secondary metabolites identified as possible antimicrobialagents that are used across the globe to treat numerous diseases and ailments.These secondary metabolites serve as unique commercial sources of variouspharmaceuticals, food additives and flavouring agents, and possess diverse industrialapplications. Alkaloids, flavonoids, and polyphenols are secondary metabolites shownto attack numerous gram-positive and gram negative bacteria in response to microbialinfections. Secondary plant metabolites have a detrimental effect on microbial cells inseveral ways, such as al
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Rai, Vikas. "Alzheimer’s Disease: Diagnosis and Cure." In The Brain: A Systems Neuroscience Perspective. BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815256987124010006.

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Causative agents of Alzheimer’s disease are 1) amyloid β foldings, 2) neurofibrillary tangles, and 3) reactive gliosis. Interaction of Aβ with the prion protein within neurons has recently been suggested to be the basis for drug discovery. Prion protein is a membrane protein found on cell surfaces of diverse types [1]. The accumulation of misfolded and unfolded proteins (UP) generates stress in the endoplasmic reticulum. This stress worsens the health of the regular function of neuronal cells. The role of unfolded protein response in T cell development and function has also been acknowledged [
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10

Choubey, Jyotsna, Jyoti Kant Choudhari, J. Anandkumar, Mukesh Kumar Verma, Tanushree Chaterjee, and Biju Prava Sahariah. "Cell Biology, Biochemistry and Metabolism of Unique Anammox Bacteria." In Ammonia Oxidizing Bacteria. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837671960-00147.

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Anaerobic ammonium oxidation (anammox) bacteria oxidize ammonium in the absence of oxygen with NO2 as the oxidant instead of oxygen and form dinitrogen (N2) as the end product. Anammox bacteria belong to the phylum Planctomycetes. Anammox bacteria are characterized by a compartmentalized cell architecture featuring a central cell compartment, the “anammoxosome”. This organelle is surrounded by ladderane lipids, which make the organelle nearly impermeable to hydrazine and protons. Anammox bacteria show similarities to both Archaea and Eukarya, making them extremely interesting from a cell biolo
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Тези доповідей конференцій з теми "Membrane d’échangeuse de protons"

1

Kittel, Jean, Xavier Feaugas, and Juan Creus. "Impact of Charging Conditions and Membrane Thickness on Hydrogen Permeation through Steel: Thick / Thin Membrane Concepts Revisited." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07211.

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Анотація:
Abstract This paper develops the relationships between proton reduction at the surface of metals, and hydrogen evolution or hydrogen diffusion into the metal. Equations relating the permeation rate to the proton reduction rate are developed in the case of adsorption - absorption mechanism, with Volmer - Tafel reactions. Analytical expressions are derived, and three distinct regimes are evidenced: i/a thin membrane - low current domain, where all reduced protons enter into the metal and diffuses to the exit face (i.e. the permeation rate is equal to the faradaic reaction rate); ii/a thin membra
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2

Cheng, Chin-Hsien, Shu-Feng Lee, and Che-Wun Hong. "Molecular Dynamics of Proton Exchange Inside a Nafion® Membrane." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97135.

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Анотація:
The proton transfer mechanism is the fundamental principle of how the proton exchange membrane fuel cell (PEMFC) works. This paper develops a molecular dynamics technique to simulate the transfer mechanism of the hydrogen protons inside a Nafion 117 membrane. The realistic polymer structure of the Nafion is extremely huge and very complex, it is simplified to be a repeated structure with part of the major carbon-fluoride backbone and a side chain with radicals of SO3− in this paper. Water molecules were assigned to distribute between side chains randomly. The simulation package of DLPOLY was e
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3

Eaton, Brandon, Michael R. von Spakovsky, Michael W. Ellis, Douglas J. Nelson, Benoit Olsommer, and Nathan Siegel. "One-Dimensional, Transient Model of Heat, Mass, and Charge Transfer in a Proton Exchange Membrane." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/aes-23652.

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Анотація:
Abstract A transient, one-dimensional, model of the membrane of a proton exchange membrane fuel cell is presented. The role of the membrane is to transport protons from the anode to cathode of the fuel cell while preventing the transport of other reactants. The membrane is modeled assuming mono-phase, multi-species flow. For water transport, the principle driving forces modeled are a convective force, an osmotic force (i.e. diffusion), and an electric force. The first of these results from a pressure gradient, the second from a concentration gradient, and the third from the migration of proton
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4

Chiu, Chuang-Pin, Peng-Yu Chen, and Che-Wun Hong. "Atomistic Analysis of Proton Diffusivity at Enzymatic Biofuel Cell Anode." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97136.

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Анотація:
This paper investigates the proton diffusion phenomenon between the anode catalyst and the electrode in an enzymatic bio-fuel cell. The bio-fuel cell uses enzymatic organism as the catalyst instead of the traditional noble metal, like platinum. The fuel is normally the glucose solution. The fuel cell is membrane-less and produces electricity from the reaction taken place in the organism. When the biochemical reaction occurs, the protons and electrons are released in the solution. The electrons are collected by the electrode plate and are transported to the cathode through an external circuit,
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5

Gai, Feng, Kenton C. Hasson, and Philip A. Anfinrud. "Ultrafast Photoisomerization of Retinal in Bacteriorhodopsin: A New Twist." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.fc.5.

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Анотація:
Bacteriorhodopsin (BR) is a membrane protein which converts light energy to chemical energy by pumping protons unidirectionally across the membrane. The driving force for pumping protons is derived from the photoisomerization of all-trans retinal to 13-cis retinal, the quantum yield of which is reported to be approximately 0.61. The quantum yield appears to be independent of temperature and is minimally affected by mutations to numerous neighboring residues in the protein. Previous studies have suggested that photoexcited BR relaxes in 0.5 ps to J which in turn relaxes in 3 ps to K2. The long-
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6

Cheng, Chin-Hsien. "Nano-Scale Transport Phenomena and Thermal Effect of the PEMFC Electrolyte." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52323.

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Анотація:
This paper employed molecular dynamics (MD) simulation to investigate the transport phenomena and thermal effect at nano-scale inside fuel cell electrolyte. The material of the electrolyte was chosen to be Nafion® which is the most commonly used material for proton exchange membrane fuel cell (PEMFC). The transport of protons inside the electrolyte is one of the major issues that influencing the fuel cell performance. The structure of the Nafion® includes carbon-fluorine back bones and side chains (with SO3− attached at the end). Simulation results show that the transport of protons was confin
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7

Drochioiu, Gabi. "THE ROLE OF BACTERIORHODOPSIN IN LIGHT HARVESTING AND ATP PRODUCTION BY HALOBACTERIUM SALINARUM CELLS." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/6.1/s25.17.

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Анотація:
Halobacterium salinarum is an extremely halophilic marine Gram-negative obligate aerobic archaeon. Despite its name, this is not a bacterium, but rather a member of the domain Archaea, which lives in hypersaline lakes. Bacteriorhodopsin (BRh) is the red retinal-containing protein found in the cell membranes of H. salinarum and is considered a light-activated proton pump that transports protons across the plasma membrane. Bacteriorhodopsin photointermediates have been defined in kinetic and spectroscopic terms as BR568, K590, L550, M412, N560, and O640. We have previously shown, using the Forst
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8

Vang, Jakob Rabjerg, So̸ren Juhl Andreasen, and So̸ren Knudsen Kær. "A Transient Fuel Cell Model to Simulate HTPEM Fuel Cell Impedance Spectra." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54880.

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Анотація:
This paper presents a spatially resolved transient fuel cell model applied to the simulation of high temperature PEM fuel cell impedance spectra. The model is developed using a 2D finite volume method approach. The model is resolved along the channel and across the membrane. The model considers diffusion of cathode gas species in gas diffusion layers and catalyst layer, transport of protons in the membrane and the catalyst layers, and double layer capacitive effects in the catalyst layers. The model has been fitted simultaneously to a polarisation curve and to an impedance spectrum recorded in
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9

Xiao, Yu, Jinliang Yuan, and Bengt Sunde´n. "On Modeling Development of Microscopic Spatial Structure for the Catalyst Layer in a Proton Exchange Membrane Fuel Cell." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54882.

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Анотація:
The typical catalyst layers (CLs) in proton exchange membrane fuel cells (PEMFCs) are fabricated as random heterogeneous composites to meet the multifunctional requirements of transport phenomena and electrochemical activity. The employment of Pt nano-particles, carbonaceous substrates and Nafion ionomers in CLs allows effective diffusion of hydrogen and oxygen, transport and phase change of water, migration and diffusion of protons, migration of electrons to and from the catalytic sites, which is accompanied by the oxidation of hydrogen in anodes and the generation of water and heat in cathod
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10

Daino, Michael M., and Satish G. Kandlikar. "Evaluation of Imaging Techniques Applied to Water Management Research in PEMFCs." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82031.

Повний текст джерела
Анотація:
Water management in proton exchange membrane fuel cells (PEMFCs) is critical in efficient operation of fuel cells during normal operation as well as purge and start-up conditions. Insufficient membrane hydration impedes the flow of protons and an overabundance of water obstructs the flow of reactants in the gas diffusion layer (GDL) and in gas distribution channels. These two extremes of water content in PEMFCs significantly reduce performance and efficiency, causing material degradation and potential failure. Visualization and quantitative measurement of water content in PEMFCs lead to greate
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Звіти організацій з теми "Membrane d’échangeuse de protons"

1

Nelson, Nathan, and Randy Schekman. Functional Biogenesis of V-ATPase in the Vacuolar System of Plants and Fungi. United States Department of Agriculture, 1996. http://dx.doi.org/10.32747/1996.7574342.bard.

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Анотація:
The vacuolar H+-ATPase (V-ATPase) is one of the most fundamental enzymes in nature. It pumps protons into the vacuolar system of eukaryotic cells and provides the energy for numerous transport systems. Through our BARD grant we discovered a novel family of membrane chaperones that modulate the amount of membrane proteins. We also elucidated the mechanism by which assembly factors guide the membrane sector of V-ATPase from the endoplasmic reticulum to the Golgi apparatus. The major goal of the research was to understand the mechanism of action and biogenesis of V-ATPase in higher plants and fun
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