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Journal articles on the topic 'Catalyse modulable'

Author: Grafiati
Published: 19 April 2025

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1

Rodríguez-Ruiz, Marta, Salvador González-Gordo, Amanda Cañas, et al. "Sweet Pepper (Capsicum annuum L.) Fruits Contain an Atypical Peroxisomal Catalase That Is Modulated by Reactive Oxygen and Nitrogen Species." Antioxidants 8, no. 9 (2019): 374. http://dx.doi.org/10.3390/antiox8090374.

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During the ripening of sweet pepper (Capsicum annuum L.) fruits, in a genetically controlled scenario, enormous metabolic changes occur that affect the physiology of most cell compartments. Peroxisomal catalase gene expression decreases after pepper fruit ripening, while the enzyme is also susceptible to undergo post-translational modifications (nitration, S-nitrosation, and oxidation) promoted by reactive oxygen and nitrogen species (ROS/RNS). Unlike most plant catalases, the pepper fruit enzyme acts as a homodimer, with an atypical native molecular mass of 125 to 135 kDa and an isoelectric p
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2

Ilani, Tal, Assaf Alon, Iris Grossman, et al. "A Secreted Disulfide Catalyst Controls Extracellular Matrix Composition and Function." Science 341, no. 6141 (2013): 74–76. http://dx.doi.org/10.1126/science.1238279.

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Disulfide bond formation in secretory proteins occurs primarily in the endoplasmic reticulum (ER), where multiple enzyme families catalyze cysteine cross-linking. Quiescin sulfhydryl oxidase 1 (QSOX1) is an atypical disulfide catalyst, localized to the Golgi apparatus or secreted from cells. We examined the physiological function for extracellular catalysis of de novo disulfide bond formation by QSOX1. QSOX1 activity was required for incorporation of laminin into the extracellular matrix (ECM) synthesized by fibroblasts, and ECM produced without QSOX1 was defective in supporting cell-matrix ad
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3

Ramirez-Ramirez, Joaquin, Javier Martin-Diaz, Nina Pastor, Miguel Alcalde, and Marcela Ayala. "Exploring the Role of Phenylalanine Residues in Modulating the Flexibility and Topography of the Active Site in the Peroxygenase Variant PaDa-I." International Journal of Molecular Sciences 21, no. 16 (2020): 5734. http://dx.doi.org/10.3390/ijms21165734.

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Unspecific peroxygenases (UPOs) are fungal heme-thiolate enzymes able to catalyze a wide range of oxidation reactions, such as peroxidase-like, catalase-like, haloperoxidase-like, and, most interestingly, cytochrome P450-like. One of the most outstanding properties of these enzymes is the ability to catalyze the oxidation a wide range of organic substrates (both aromatic and aliphatic) through cytochrome P450-like reactions (the so-called peroxygenase activity), which involves the insertion of an oxygen atom from hydrogen peroxide. To catalyze this reaction, the substrate must access a channel
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4

Carpena, Xavier, Ben Wiseman, Taweewat Deemagarn, et al. "A molecular switch and electronic circuit modulate catalase activity in catalase‐peroxidases." EMBO reports 6, no. 12 (2005): 1156–62. http://dx.doi.org/10.1038/sj.embor.7400550.

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5

Ochoa, Elba, Wilson Henao, Sara Fuertes, et al. "Synthesis and characterization of a supported Pd complex on carbon nanofibers for the selective decarbonylation of stearic acid to 1-heptadecene: the importance of subnanometric Pd dispersion." Catalysis Science & Technology 10, no. 9 (2020): 2970–85. http://dx.doi.org/10.1039/d0cy00322k.

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Evaluation of the dispersion of Pd active sites on the catalyst performance during fatty acids decarbonylation to α-olefins was explored in this work. Pd subnanometric particles, clusters and aggregates were found to modulate the catalyst activity.
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6

Wang, T. S., Y. F. Shu, Y. C. Liu, K. Y. Jan, and H. Huang. "Glutathione peroxidase and catalase modulate the genotoxicity of arsenite." Toxicology 121, no. 3 (1997): 229–37. http://dx.doi.org/10.1016/s0300-483x(97)00071-1.

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7

Xu, Zheng, So Fun Chau, Kwok Ho Lam, Ho Yin Chan, Tzi Bun Ng, and Shannon W. N. Au. "Crystal structure of the SENP1 mutant C603S–SUMO complex reveals the hydrolytic mechanism of SUMO-specific protease." Biochemical Journal 398, no. 3 (2006): 345–52. http://dx.doi.org/10.1042/bj20060526.

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SUMO (small ubiquitin-related modifier)-specific proteases catalyse the maturation and de-conjugation processes of the sumoylation pathway and modulate various cellular responses including nuclear metabolism and cell cycle progression. The active-site cysteine residue is conserved among all known SUMO-specific proteases and is not substitutable by serine in the hydrolysis reactions demonstrated previously in yeast. We report here that the catalytic domain of human protease SENP1 (SUMO-specific protease 1) mutant SENP1CC603S carrying a mutation of cysteine to serine at the active site is inacti
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8

Sun, He, Mengfan Wang, Xinchuan Du, et al. "Modulating the d-band center of boron doped single-atom sites to boost the oxygen reduction reaction." Journal of Materials Chemistry A 7, no. 36 (2019): 20952–57. http://dx.doi.org/10.1039/c9ta06949f.

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A boron dopant is experimentally and theoretically confirmed to effectively modulate the d-band center of a single-atom catalyst, enabling favorable adsorption kinetics of oxygen intermediates and thus greatly improving the ORR performance.
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9

Thomson, Martha, Khaled Al-Qattan, Mohamed H. Mansour, and Muslim Ali. "Green Tea Attenuates Oxidative Stress and Downregulates the Expression of Angiotensin II AT1Receptor in Renal and Hepatic Tissues of Streptozotocin-Induced Diabetic Rats." Evidence-Based Complementary and Alternative Medicine 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/409047.

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This study investigates the potential of green tea to modulate oxidative stress and angiotensin II AT1receptor expression in renal and hepatic tissues of diabetic rats. Three groups of rats were studied after 8 weeks following diabetes induction: normal, streptozotocin-induced diabetic (diabetic control), and green-tea-treated diabetic rats. Total antioxidant, catalase, and malondialdehyde levels were assayed by standard procedures. Levels of AT1receptor labeling, in renal and hepatic tissues of the three rat groups, were immunohistochemically investigated using an anti-AT1receptor antibody. L
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10

Fang, Wei, Chengtao Wang, Zhiqiang Liu, et al. "Physical mixing of a catalyst and a hydrophobic polymer promotes CO hydrogenation through dehydration." Science 377, no. 6604 (2022): 406–10. http://dx.doi.org/10.1126/science.abo0356.

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In many reactions restricted by water, selective removal of water from the reaction system is critical and usually requires a membrane reactor. We found that a simple physical mixture of hydrophobic poly(divinylbenzene) with cobalt-manganese carbide could modulate a local environment of catalysts for rapidly shipping water product in syngas conversion. We were able to shift the water-sorption equilibrium on the catalyst surface, leading to a greater proportion of free surface that in turn raised the rate of syngas conversion by nearly a factor of 2. The carbon monoxide conversion reached 63.5%
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11

Reyes, Ronald L., Miyu Sato, Tomohiro Iwai, Kimichi Suzuki, Satoshi Maeda, and Masaya Sawamura. "Asymmetric remote C–H borylation of aliphatic amides and esters with a modular iridium catalyst." Science 369, no. 6506 (2020): 970–74. http://dx.doi.org/10.1126/science.abc8320.

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Site selectivity and stereocontrol remain major challenges in C–H bond functionalization chemistry, especially in linear aliphatic saturated hydrocarbon scaffolds. We report the highly enantioselective and site-selective catalytic borylation of remote C(sp3)–H bonds γ to the carbonyl group in aliphatic secondary and tertiary amides and esters. A chiral C–H activation catalyst was modularly assembled from an iridium center, a chiral monophosphite ligand, an achiral urea-pyridine receptor ligand, and pinacolatoboryl groups. Quantum chemical calculations support an enzyme-like structural cavity f
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12

Wang, Geqing, Jilong Qin, Anthony D. Verderosa, et al. "A Buried Water Network Modulates the Activity of the Escherichia coli Disulphide Catalyst DsbA." Antioxidants 12, no. 2 (2023): 380. http://dx.doi.org/10.3390/antiox12020380.

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The formation of disulphide bonds is an essential step in the folding of many proteins that enter the secretory pathway; therefore, it is not surprising that eukaryotic and prokaryotic organisms have dedicated enzymatic systems to catalyse this process. In bacteria, one such enzyme is disulphide bond-forming protein A (DsbA), a thioredoxin-like thiol oxidase that catalyses the oxidative folding of proteins required for virulence and fitness. A large body of work on DsbA proteins, particularly Escherichia coli DsbA (EcDsbA), has demonstrated the key role that the Cys30-XX-Cys33 catalytic motif
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13

Wang, Shujiang, Ganesh N. Nawale, Oommen P. Oommen, Jöns Hilborn, and Oommen P. Varghese. "Influence of ions to modulate hydrazone and oxime reaction kinetics to obtain dynamically cross-linked hyaluronic acid hydrogels." Polymer Chemistry 10, no. 31 (2019): 4322–27. http://dx.doi.org/10.1039/c9py00862d.

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14

Wang, Guohong, Min Li, Wenmin Pang, Min Chen, and Chen Tan. "Lewis acids in situ modulate pyridazine-imine Ni catalysed ethylene (co)polymerisation." New Journal of Chemistry 43, no. 34 (2019): 13630–34. http://dx.doi.org/10.1039/c9nj01243e.

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The Lewis acid-base interaction between B(iii) Lewis acids and the pyridazine moiety reduced the electron density from the Ni center and in situ modulated the pyridazine-imine nickel catalyzed ethylene (co)polymerisation.
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15

Vu, Khanh B., Konstantin V. Bukhryakov, Dalaver H. Anjum, and Valentin O. Rodionov. "Surface-Bound Ligands Modulate Chemoselectivity and Activity of a Bimetallic Nanoparticle Catalyst." ACS Catalysis 5, no. 4 (2015): 2529–33. http://dx.doi.org/10.1021/acscatal.5b00262.

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16

Smołka, Szymon, and Katarzyna Krukiewicz. "Catalyst Design through Grafting of Diazonium Salts—A Critical Review on Catalyst Stability." International Journal of Molecular Sciences 24, no. 16 (2023): 12575. http://dx.doi.org/10.3390/ijms241612575.

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In the pursuit of designing a reusable catalyst with enhanced catalytic activity, recent studies indicate that electrochemical grafting of diazonium salts is an efficient method of forming heterogeneous catalysts. The aim of this review is to assess the industrial applicability of diazonium-based catalysts with particular emphasis on their mechanical, chemical, and thermal stability. To this end, different approaches to catalyst production via diazonium salt chemistry have been compared, including the immobilization of catalysts by a chemical reaction with a diazonium moiety, the direct use of
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17

Sharp, Victoria, Lisa M. Thurston, Robert C. Fowkes та Anthony E. Michael. "11β-Hydroxysteroid dehydrogenase enzymes in the testis and male reproductive tract of the boar (Sus scrofa domestica) indicate local roles for glucocorticoids in male reproductive physiology". Reproduction 134, № 3 (2007): 473–82. http://dx.doi.org/10.1530/rep-07-0126.

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11β-Hydroxysteroid dehydrogenase (11βHSD) enzymes modulate the target cell actions of corticosteroids by catalysing metabolism of the physiological glucocorticoid (GC), cortisol, to inert cortisone. Recent studies have implicated GCs in boar sperm apoptosis. Hence, the objective of this study was to characterise 11βHSD enzyme expression and activities in the boar testis and reproductive tract. Although 11βHSD1 and 11βHSD2 mRNA transcripts and proteins were co-expressed in all tissues, cortisol–cortisone interconversion was undetectable in the corpus and cauda epididymides, vas deferens, vesicu
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18

Lu, Xiaodong, Guofu Wang, Yu Yang, Xiangpeng Kong, and Jiangang Chen. "A boron-doped carbon aerogel-supported Cu catalyst for the selective hydrogenation of dimethyl oxalate." New Journal of Chemistry 44, no. 8 (2020): 3232–40. http://dx.doi.org/10.1039/c9nj05956c.

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19

Zhang, Zicong, Xiangli Ru, Xiaoli Yang, Zhengyu Bai, and Lin Yang. "Red Blood Cells-Derived Iron Self–Doped 3D Porous Carbon Networks for Efficient Oxygen Reduction." Catalysts 12, no. 3 (2022): 273. http://dx.doi.org/10.3390/catal12030273.

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In addition to C, H and O, some biomass is also rich in mineral elements. The recovery and utilization of special mineral elements is of great significance to prepare functional materials and alleviate the current energy shortage. Herein, we describe a facile strategy for making full use of the chemical composition (C, Fe) and special structure of red blood cells (RBCs) from waste pig blood to fabricate a dual metal (Fe, Co)-nitrogen (N)-doped porous carbon catalyst by pyrolysis of a mixture of RBCs biomass, cobaltous acetate, and melamine. The porous catalyst displays a comparable activity fo
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20

Jussupow, Alexander, Andrea Di Luca, and Ville R. I. Kaila. "How cardiolipin modulates the dynamics of respiratory complex I." Science Advances 5, no. 3 (2019): eaav1850. http://dx.doi.org/10.1126/sciadv.aav1850.

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Cardiolipin modulates the activity of membrane-bound respiratory enzymes that catalyze biological energy transduction. The respiratory complex I functions as the primary redox-driven proton pump in mitochondrial and bacterial respiratory chains, and its activity is strongly enhanced by cardiolipin. However, despite recent advances in the structural biology of complex I, cardiolipin-specific interaction mechanisms currently remain unknown. On the basis of millisecond molecular simulations, we suggest that cardiolipin binds to proton-pumping subunits of complex I and induces global conformationa
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21

Rey, Yannick P., and Ryan Gilmour. "Modulating NHC catalysis with fluorine." Beilstein Journal of Organic Chemistry 9 (December 6, 2013): 2812–20. http://dx.doi.org/10.3762/bjoc.9.316.

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Fluorination often confers a range of advantages in modulating the conformation and reactivity of small molecule organocatalysts. By strategically introducing fluorine substituents, as part of a β-fluoroamine motif, in a triazolium pre-catalyst, it was possible to modulate the behaviour of the corresponding N-heterocyclic carbene (NHC) with minimal steric alterations to the catalyst core. In this study, the effect of hydrogen to fluorine substitution was evaluated as part of a molecular editing study. X-ray crystallographic analyses of a number of derivatives are presented and the conformation
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22

Ji, Junhyuk, Minseon Park, Minho Kim, et al. "Cationic-Dependent Cooperative Catalysis of Ni0.261Co0.739S2/N-Doped Carbon Nanotubes for Achieving Superior Electrocatalytic Activity and Cycling Stability at High Rate in Li-S Batteries." ECS Meeting Abstracts MA2024-02, no. 67 (2024): 4447. https://doi.org/10.1149/ma2024-02674447mtgabs.

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Lithium-sulfur (Li-S) batteries are increasingly recognized for their exceptional energy storage capabilities, offering an energy density of approximately 2600 Wh kg-1. This is largely attributed to the use of sulfur in the cathode—a material both abundantly available and cost-effective. However, the widespread adoption of Li-S batteries faces significant challenges, including the low electrical conductivity of sulfur and its discharge byproducts (e.g., Li2S2, Li2S), the migration of polysulfides within the electrolyte, and electrode volume expansion, which collectively impede their practical
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23

Muro, Silvia, Madalina Mateescu, Christine Gajewski, Mary Robinson, Vladimir R. Muzykantov, and Michael Koval. "Control of intracellular trafficking of ICAM-1-targeted nanocarriers by endothelial Na+/H+ exchanger proteins." American Journal of Physiology-Lung Cellular and Molecular Physiology 290, no. 5 (2006): L809—L817. http://dx.doi.org/10.1152/ajplung.00311.2005.

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Targeting nanocarriers (NC) loaded by antioxidant enzymes (e.g., catalase) to endothelial cell adhesion molecules (CAM) alleviates oxidative stress in the pulmonary vasculature. However, antioxidant protection is transient, since CAM-targeted catalase is internalized, delivered to lysosomes, and degraded. To design means to modulate the metabolism and longevity of endothelial cell (EC)-targeted drugs, we identified and manipulated cellular elements controlling the uptake and intracellular trafficking of NC targeted to ICAM-1 (anti-ICAM/NC). BAPTA, thapsigargin, amiloride, and EIPA inhibited an
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24

Kwon, Youngkook. "(Invited, Digital Presentation) Interface Rich Catalyst Design for Enhanced CO2 Conversion." ECS Meeting Abstracts MA2022-02, no. 48 (2022): 1863. http://dx.doi.org/10.1149/ma2022-02481863mtgabs.

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The efficient electrochemical conversion of CO2 to fuels or stock chemicals with high-energy density would be a major step forward in the introduction of a carbon neutral energy cycle. Especially, understanding the role of electrocatalysts, supports, and electrolytes that can efficiently reduce CO2 to fuels with high selectivity is a subject of significant interest. Copper is the only known catalyst for producing a reasonable quantity of hydrocarbons, which means that designing proper electrode interfaces would modulate the catalytic reactivity and product selectivity. One of the observations
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Li, Haobo, Jianping Xiao, Qiang Fu, and Xinhe Bao. "Confined catalysis under two-dimensional materials." Proceedings of the National Academy of Sciences 114, no. 23 (2017): 5930–34. http://dx.doi.org/10.1073/pnas.1701280114.

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Confined microenvironments formed in heterogeneous catalysts have recently been recognized as equally important as catalytically active sites. Understanding the fundamentals of confined catalysis has become an important topic in heterogeneous catalysis. Well-defined 2D space between a catalyst surface and a 2D material overlayer provides an ideal microenvironment to explore the confined catalysis experimentally and theoretically. Using density functional theory calculations, we reveal that adsorption of atoms and molecules on a Pt(111) surface always has been weakened under monolayer graphene,
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26

Warren, Averil Y., Balwir Matharoo-Ball, Robert W. Shaw, and Raheela N. Khan. "Hydrogen peroxide and superoxide anion modulate pregnant human myometrial contractility." Reproduction 130, no. 4 (2005): 539–44. http://dx.doi.org/10.1530/rep.1.00437.

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Reactive oxygen species (ROS) have the propensity to cause macromolecular damage with consequent modification of cellular function. We investigated the effects of two particular oxidants, superoxide (O2−) anions and hydrogen peroxide (H2O2), on oxytocin-induced myometrial contractility using biopsies from women undergoing Caesarean section at term gestation. Isometric tension recordings were performed and concentration–response curves derived after addition of test agents. A maximal reduction in myometrial contractility to 27.2 ± 4.5% of control was observed followed application of H2O2. The e
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27

Montserrat-de la Paz, Sergio, Gabriela Carrillo-Berdasco, Fernando Rivero-Pino, Alvaro Villanueva-Lazo, and Maria C. Millan-Linares. "Hemp Protein Hydrolysates Modulate Inflammasome-Related Genes in Microglial Cells." Biology 12, no. 1 (2022): 49. http://dx.doi.org/10.3390/biology12010049.

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A prolonged inflammatory response can lead to the development of neurodegenerative diseases such as Alzheimer’s disease. Enzymatic hydrolysis is a sustainable way to increase the value of protein sources by obtaining peptides that can exert bioactivity. Hemp (Cannabis sativa L.) protein hydrolysates have been proven to exert anti-inflammatory activity. In this study, two hemp protein hydrolysate (HPHs), obtained with Alcalase as sole catalyst, or with Alcalase followed by Flavourzyme, were evaluated as inflammatory mediators (TNFα, IL-1β, IL-6, and IL-10), microglial polarization markers (Ccr7
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28

Chen, Billy T., Marat V. Avshalumov, and Margaret E. Rice. "H2O2 Is a Novel, Endogenous Modulator of Synaptic Dopamine Release." Journal of Neurophysiology 85, no. 6 (2001): 2468–76. http://dx.doi.org/10.1152/jn.2001.85.6.2468.

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Recent evidence suggests that reactive oxygen species (ROS) might act as modulators of neuronal processes, including synaptic transmission. Here we report that synaptic dopamine (DA) release can be modulated by an endogenous ROS, H2O2. Electrically stimulated DA release was monitored in guinea pig striatal slices using carbon-fiber microelectrodes with fast-scan cyclic voltammetry. Exogenously applied H2O2reversibly inhibited evoked release in the presence of 1.5 mM Ca2+. The effectiveness of exogenous H2O2, however, was abolished or decreased by conditions that enhance Ca2+ entry, including i
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29

Van-Brunt, Alexander John. "A Lifetime Prediction Model for the Anode Catalyst Layer in PEM Electroyzers." ECS Meeting Abstracts MA2024-02, no. 45 (2024): 3164. https://doi.org/10.1149/ma2024-02453164mtgabs.

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Electrolyzer stacks (ELY stacks) are anticipated to form a key component in the hydrogen economy by providing a clean hydrogen source which may be deployed modularly. Currently, proton-exchange-membrane (PEM) electolyzers are a promising candidate to meet this demand on account of their high performance relative other electrolysis methods. Amongst other considerations, economic barriers preventing the uptake of PEM ELY stacks are the durability and cost of the precious catalyst materials, especially iridium-loaded catalysts. Additionally, due to the ever-growing uptake of intermittent power so
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30

Hamkins, Kiran, and Xiaolin Zheng. "Metal Supported Metal Oxide Catalysts for Hydrogen Peroxide Production Via Water Splitting." ECS Meeting Abstracts MA2024-01, no. 48 (2024): 3101. http://dx.doi.org/10.1149/ma2024-01483101mtgabs.

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The two-electron water oxidation reaction (WOR) has drawn recent attention as an efficient, simple method of producing on-site hydrogen peroxide through electrochemical water splitting. However, finding electrocatalysts with high activity and stability in the reaction’s harsh oxidizing environment is challenging. This is made especially difficult due to the competing four-electron and one-electron WOR, which necessitate a catalyst material with high selectivity towards the hydrogen peroxide production pathway. Here, we utilize metal/metal oxide coupling interactions to tune metal oxide catalys
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Samuni, Amram, Eric Maimon, and Sara Goldstein. "Nitroxides protect horseradish peroxidase from H2O2-induced inactivation and modulate its catalase-like activity." Biochimica et Biophysica Acta (BBA) - General Subjects 1861, no. 8 (2017): 2060–69. http://dx.doi.org/10.1016/j.bbagen.2017.03.021.

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Cottone, Grazia, Sergio Giuffrida, Stefano Bettati, et al. "More than a Confinement: “Soft” and “Hard” Enzyme Entrapment Modulates Biological Catalyst Function." Catalysts 9, no. 12 (2019): 1024. http://dx.doi.org/10.3390/catal9121024.

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Catalysis makes chemical and biochemical reactions kinetically accessible. From a technological point of view, organic, inorganic, and biochemical catalysis is relevant for several applications, from industrial synthesis to biomedical, material, and food sciences. A heterogeneous catalyst, i.e., a catalyst confined in a different phase with respect to the reagents’ phase, requires either its physical confinement in an immobilization matrix or its physical adsorption on a surface. In this review, we will focus on the immobilization of biological catalysts, i.e., enzymes, by comparing hard and s
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Li, Shilin, Yuxin Wang, Kun Tang, et al. "Preparation of nickel-manganese based bimetallic hydroxide nanosheets for enhanced electrocatalytic oxygen evolution reaction." Journal of Physics: Conference Series 2838, no. 1 (2024): 012002. http://dx.doi.org/10.1088/1742-6596/2838/1/012002.

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Abstract This paper uses a common one-step hydrothermal method to prepare NiMn-LDH/NF (Layered Double Hydroxide, LDH) oxygen evolution catalyst with outstanding performance. The NiMn-LDH grows into a nanosheet array structure on nickel foam (NF) and it has a big surface area and exceptional ion transport function that could accelerate the diffusion rate of electrocatalytic products. It attempted to modulate the molar proportion of Ni and Mn to explore the oxygen evolution reaction (OER) performance of the NiMn-LDH/NF catalysts. It was found that when Ni:Mn=4:1 (molar ratio, hereinafter), the n
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34

Yang, Zixuan, Huijuan Su, Yanan Cheng, et al. "Performance, Reaction Pathway, and Pretreatment of Au Catalyst Precursor in H2/O2 Atmosphere for the Epoxidation of Propylene." Catalysts 12, no. 5 (2022): 540. http://dx.doi.org/10.3390/catal12050540.

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Gas-phase epoxidation of propylene in the copresence of H2 and O2 was performed over the catalyst of Au on as-synthesized TS-1 that contained a small amount of anatase TiO2. The catalytic performance was studied by washing or nonwashing the catalyst precursor to modulate the content of purity (K, Cl) and then calcining the samples in O2 or H2 prior to reaction. The results show that the catalytic performance of Au/TS-1 can be improved without washing (more K+ and Au maintained) and O2 pretreatment. It was found that the calcination in O2 was able to maintain more metallic Au and form more surf
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Gerna, Davide, Thomas Roach, Birgit Mitter, Wolfgang Stöggl, and Ilse Kranner. "Hydrogen Peroxide Metabolism in Interkingdom Interaction Between Bacteria and Wheat Seeds and Seedlings." Molecular Plant-Microbe Interactions® 33, no. 2 (2020): 336–48. http://dx.doi.org/10.1094/mpmi-09-19-0248-r.

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In endophytes, the abundance of genes coding for enzymes processing reactive oxygen species (ROS), including hydrogen peroxide (H2O2), argues for a crucial role of ROS metabolism in plant-microbe interaction for plant colonization. Here, we studied H2O2 metabolism of bread wheat (Triticum aestivum L.) seeds and their microbiota during germination and early seedling growth, the most vulnerable stages in the plant life cycle. Treatment with hot steam diminished the seed microbiota, and these seeds produced less extracellular H2O2 than untreated seeds. Using a culture-dependent approach, Pantoea
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Zhou, Huang, Nannan Zhang, Hui Bai, et al. "A pulse modulatable self-oscillation kinetics for water oxidation at large current on manganese catalyst." Electrochimica Acta 337 (March 2020): 135798. http://dx.doi.org/10.1016/j.electacta.2020.135798.

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37

Zhao, Jun, Baozhan Wang, and Zhongjun Jia. "Phylogenetically Distinct Phylotypes Modulate Nitrification in a Paddy Soil." Applied and Environmental Microbiology 81, no. 9 (2015): 3218–27. http://dx.doi.org/10.1128/aem.00426-15.

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ABSTRACTPaddy fields represent a unique ecosystem in which regular flooding occurs, allowing for rice cultivation. However, the taxonomic identity of the microbial functional guilds that catalyze soil nitrification remains poorly understood. In this study, we provide molecular evidence for distinctly different phylotypes of nitrifying communities in a neutral paddy soil using high-throughput pyrosequencing and DNA-based stable isotope probing (SIP). Following urea addition, the levels of soil nitrate increased significantly, accompanied by an increase in the abundance of the bacterial and arch
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Morimoto, Tatsuki, Hidemitsu Uno, and Hiroyuki Furuta. "Benzene Ring Trimer Interactions Modulate Supramolecular Structures." Angewandte Chemie International Edition 46, no. 20 (2007): 3672–75. http://dx.doi.org/10.1002/anie.200604371.

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39

Peng, Lechao, Lan Zhou, Wenjun Kang, et al. "Electrospinning Synthesis of Carbon-Supported Pt3Mn Intermetallic Nanocrystals and Electrocatalytic Performance towards Oxygen Reduction Reaction." Nanomaterials 10, no. 9 (2020): 1893. http://dx.doi.org/10.3390/nano10091893.

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To realize the large-scale application of fuel cells, it is still a great challenge to improve the performance and reduce the cost of cathode catalysts towards oxygen reduction reaction (ORR). In this work, carbon-supported ordered Pt3Mn intermetallic catalysts were prepared by thermal annealing electrospun polyacrylonitrile nanofibers containing Platinum(II) acetylacetonate/ Manganese(III) acetylacetonate. Compared with its counterparts, the ordered Pt3Mn intermetallic obtained at 950 °C exhibits a more positive half-potential and higher kinetic current density during the ORR process. Benefit
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40

Olson, C. E., M. C. Chen, D. A. Amirian, and A. H. Soll. "Oxygen metabolites modulate prostaglandin E2 production by isolated gastric mucosal cells." American Journal of Physiology-Gastrointestinal and Liver Physiology 256, no. 5 (1989): G925—G930. http://dx.doi.org/10.1152/ajpgi.1989.256.5.g925.

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We previously found that the small cell fraction of isolated cells from canine gastric mucosa is a major producer of prostaglandin E2 (PGE2) and identified macrophages as the predominant cellular source. Prostaglandin-H synthase activity is dependent on the continuous presence of hydroperoxides. Because reactive oxygen metabolites may mediate mucosal injury in inflammatory or ischemic disease, we studied the release of PGE2 by isolated gastric cells during exposure to an oxygen metabolite-generating system, xanthine and xanthine oxidase. We found a concentration-dependent relationship between
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Wang, Tianzuo, Lun Pan, Xiangwen Zhang, and Ji-Jun Zou. "Insights into the Pt (111) Surface Aid in Predicting the Selective Hydrogenation Catalyst." Catalysts 10, no. 12 (2020): 1473. http://dx.doi.org/10.3390/catal10121473.

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The d-band center position of the metal catalyst is one of the most important factors for catalytic selective hydrogenation, e.g., the conversion of nitrostyrene to aminostyrene. In this work, we modulate the d-band center position of the Pt surface via H coverage manipulation in order to assess the highly efficient selective hydrogenation catalyst using density functional theory (DFT) calculation, which is validated experimentally. The optimal transition metal catalysts are first screened by comparing the adsorption energy values of two ideal models, nitrobenzene and styrene, and by correlati
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Singh, Ashish Kumar, Kirti Sad, Shailendra Kumar Singh, and Sisinthy Shivaji. "Regulation of gene expression at low temperature: role of cold-inducible promoters." Microbiology 160, no. 7 (2014): 1291–96. http://dx.doi.org/10.1099/mic.0.077594-0.

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Psychrophilic micro-organisms are the most dominant flora in cold habitats. Their unique ability to survive and multiply at low temperatures (<5 °C) is based on their ability to modulate the rigidity of the membrane, to transcribe, to translate and to catalyse biochemical reactions at low temperature. A number of genes are known to be upregulated during growth at low temperature and cold-inducible promoters are known to regulate the expression of genes at low temperature. In this review, we attempted to compile promoter sequences of genes that are cold-inducible so as to identify similariti
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Mondal, Rakesh, Himanshu Ratnawat, Sarvesh Kumar, Anil Kumar, and Preetam Singh. "Ni stabilized rock-salt structured CoO; Co1−xNixO: tuning of eg electrons to develop a novel OER catalyst." RSC Advances 10, no. 30 (2020): 17845–53. http://dx.doi.org/10.1039/d0ra03050c.

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Kwak, Mi-Sun, Hisaaki Mihara, and Nobuyoshi Esaki. "A novel regulatory function of selenocysteine lyase, a unique catalyst to modulate major urinary protein." Journal of Molecular Catalysis B: Enzymatic 23, no. 2-6 (2003): 367–72. http://dx.doi.org/10.1016/s1381-1177(03)00100-0.

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Ge, Xiao, Dongqin Zhou, Jie Wang, Weiqin Yin, Xiaozhi Wang, and Yuen Wu. "Rational regulation of the electronic structure of Cu1 sites catalyst to modulate persulphate activation pathway." Chemical Engineering Journal 481 (February 2024): 148587. http://dx.doi.org/10.1016/j.cej.2024.148587.

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46

Swanwick, Richard S., Giovanni Maglia, Lai-hock Tey, and Rudolf K. Allemann. "Coupling of protein motions and hydrogen transfer during catalysis by Escherichia coli dihydrofolate reductase." Biochemical Journal 394, no. 1 (2006): 259–65. http://dx.doi.org/10.1042/bj20051464.

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The enzyme DHFR (dihydrofolate reductase) catalyses hydride transfer from NADPH to, and protonation of, dihydrofolate. The physical basis of the hydride transfer step catalysed by DHFR from Escherichia coli has been studied through the measurement of the temperature dependence of the reaction rates and the kinetic isotope effects. Single turnover experiments at pH 7.0 revealed a strong dependence of the reaction rates on temperature. The observed relatively large difference in the activation energies for hydrogen and deuterium transfer led to a temperature dependence of the primary kinetic iso
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Zalavras, Athanasios, Ioannis G. Fatouros, Chariklia K. Deli, et al. "Age-Related Responses in Circulating Markers of Redox Status in Healthy Adolescents and Adults during the Course of a Training Macrocycle." Oxidative Medicine and Cellular Longevity 2015 (2015): 1–17. http://dx.doi.org/10.1155/2015/283921.

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Redox status changes during an annual training cycle in young and adult track and field athletes and possible differences between the two age groups were assessed. Forty-six individuals (24 children and 22 adults) were assigned to four groups: trained adolescents, (TAD,N=13), untrained adolescents (UAD,N=11), trained adults (TA,N=12), and untrained adults (UA,N=10). Aerobic capacity and redox status related variables [total antioxidant capacity (TAC), glutathione (GSH), catalase activity, TBARS, protein carbonyls (PC), uric acid, and bilirubin] were assessed at rest and in response to a time-t
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Wang, Xiong, Wenqian Kang, Lin Gao, Guangquan Li, Xuerong Chen, and Yi Guo. "Highly Flowable Nano TiO2/Porous Organic Polymer (POP) Supports for Efficient Metallocene Catalysts." Nanomaterials 11, no. 1 (2020): 60. http://dx.doi.org/10.3390/nano11010060.

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Porous organic polymers (POPs) have proven to be an efficient support in the olefin polymerization catalyst field. In this paper, nano TiO2 beads were used to modulate the pore structure, bulk density, and surface morphology and flowability of the prepared POPs. With the incorporation of the hydrophilic nano TiO2 beads, the prepared TiO2/POP supports obtained reasonable specific surface area (100–300 m2/g) and higher bulk density (0.26–0.35 g/mL) and flowability than the pure POP supports. The results show that bulk density of the prepared TiO2/POP particles increased when adding an increased
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Heroven, Christina, Victoria Georgi, Gaurav K. Ganotra та ін. "Halogen-Aromatic π Interactions Modulate Inhibitor Residence Times". Angewandte Chemie International Edition 57, № 24 (2018): 7220–24. http://dx.doi.org/10.1002/anie.201801666.

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Tian, Yiying, Zhiyuan Jiao, Fangfang Qi, et al. "Maize catalases are recruited by a virus to modulate viral multiplication and infection." Molecular Plant Pathology 25, no. 3 (2024). http://dx.doi.org/10.1111/mpp.13440.

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AbstractGiven the detrimental effects of excessive reactive oxygen species (ROS) accumulation in plant cells, various antioxidant mechanisms have evolved to maintain cellular redox homeostasis, encompassing both enzymatic components (e.g., catalase, superoxide dismutase) and non‐enzymatic ones. Despite extensive research on the role of antioxidant systems in plant physiology and responses to abiotic stresses, the potential exploitation of antioxidant enzymes by plant viruses to facilitate viral infection remains insufficiently addressed. Herein, we demonstrate that maize catalases (ZmCATs) exh
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