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Letteratura scientifica selezionata sul tema "Hydrogen peroxide production"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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Articoli di riviste sul tema "Hydrogen peroxide production"

1

Kusakabe, Ryo. "Hydrogen Peroxide Bleaching. Production, Properties and Handling of Hydrogen Peroxide." JAPAN TAPPI JOURNAL 52, n. 5 (1998): 608–15. http://dx.doi.org/10.2524/jtappij.52.608.

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2

Moy, Terence I., Eleftherios Mylonakis, Stephen B. Calderwood e Frederick M. Ausubel. "Cytotoxicity of Hydrogen Peroxide Produced by Enterococcus faecium". Infection and Immunity 72, n. 8 (agosto 2004): 4512–20. http://dx.doi.org/10.1128/iai.72.8.4512-4520.2004.

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ABSTRACT Although the opportunistic bacterial pathogen Enterococcus faecium is a leading source of nosocomial infections, it appears to lack many of the overt virulence factors produced by other bacterial pathogens, and the underlying mechanism of pathogenesis is not clear. Using E. faecium-mediated killing of the nematode worm Caenorhabditis elegans as an indicator of toxicity, we determined that E. faecium produces hydrogen peroxide at levels that cause cellular damage. We identified E. faecium transposon insertion mutants with altered C. elegans killing activity, and these mutants were altered in hydrogen peroxide production. Mutation of an NADH oxidase-encoding gene eliminated nearly all NADH oxidase activity and reduced hydrogen peroxide production. Mutation of an NADH peroxidase-encoding gene resulted in the enhanced accumulation of hydrogen peroxide. E. faecium is able to produce hydrogen peroxide by using glycerol-3-phosphate oxidase, and addition of glycerol to the culture medium enhanced the killing of C. elegans. Conversely, addition of glucose, which leads to the down-regulation of glycerol metabolism, prevented both C. elegans killing and hydrogen peroxide production. Lastly, detoxification of hydrogen peroxide either by exogenously added catalase or by a C. elegans transgenic strain overproducing catalase prevented E. faecium-mediated killing. These results suggest that hydrogen peroxide produced by E. faecium has cytotoxic effects and highlight the utility of C. elegans pathogenicity models for identifying bacterial virulence factors.

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3

Mikashinowich, Z. I., e Ye V. Olempieva. "State of antioxidant blood system at physiological pregnancy and pregnancy complicated with bleeding". Bulletin of Siberian Medicine 7, n. 2 (30 giugno 2008): 101–5. http://dx.doi.org/10.20538/1682-0363-2008-2-101-105.

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The task of our investigation was the analysis of enzyme activity of antioxidant defense in women blood at physiological pregnancy and pregnancy complicated with hypertension. It was established that hyper production of hydrogen peroxide and glutathione peroxidase activation at physiological pregnancy improved microcirculation due to vasodilatation effect of hydrogen peroxide. It was established that activation of superoxiddysmutase and myeloperoxidase at pregnancy complicated with hypertension developed endothelial dysfunction owing to citotoxic effects of hydrogen peroxide.

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4

Meizler, A., F. A. Roddick e N. A. Porter. "Continuous enzymatic treatment of 4-bromophenol initiated by UV irradiation". Water Science and Technology 62, n. 9 (1 novembre 2010): 2016–20. http://dx.doi.org/10.2166/wst.2010.550.

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Horseradish peroxidase (HRP) can be used for the treatment of halogenated phenolic substances. In the presence of hydrogen peroxide phenols are oxidized to form polymers which undergo partial dehalogenation. However, when immobilized, the peroxidase is subject to inactivation due to blockage of the active sites by the growing polymers and to deactivation by elevated levels of hydrogen peroxide. When HRP immobilized on a novel glass-based support incorporating titanium dioxide is subjected to UV irradiation, hydrogen peroxide is produced and the nascent polymer is removed. In this work a reactor was constructed that utilized HRP immobilized on the novel support and the in situ production of hydrogen peroxide to treat 4-bromophenol as a model substrate. The system was operated for almost 17 hours with no apparent decline in activity.

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5

Šnyrychová, Iva, Péter B. Kós e Éva Hideg. "Hydroxyl radicals are not the protagonists of UV-B-induced damage in isolated thylakoid membranes". Functional Plant Biology 34, n. 12 (2007): 1112. http://dx.doi.org/10.1071/fp07151.

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The production of reactive oxygen species (ROS) was studied in isolated thylakoid membranes exposed to 312 nm UV-B irradiation. Hydroxyl radicals (•OH) and hydrogen peroxide were measured directly, using a newly developed method based on hydroxylation of terephthalic acid and the homovanillic acid/peroxidase assay, respectively. At the early stage of UV-B stress (doses lower than 2.0 J cm–2), •OH were derived from superoxide radicals via hydrogen peroxide. Production of these ROS was dependent on photosynthetic electron transport and was not exclusive to UV-B. Both ROS were found in samples exposed to the same doses of PAR, suggesting that the observed ROS are by-products of the UV-B-driven electron transport rather than specific initiators of the UV-B-induced damage. After longer exposure of thylakoids to UV-B, leading to the inactivation of PSII centres, a small amount of •OH was still observed in thylakoids, even though no free hydrogen peroxide was detected. At this late stage of UV-B stress, •OH may also be formed by the direct cleavage of organic peroxides by UV-B. Immunodetection showed that the presence of the observed ROS alone was not sufficient to achieve the degradation of the D1 protein of PSII centres.

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6

Marto, Carlos Miguel, Mafalda Laranjo, Anabela Paula, Ana Sofia Coelho, Ana Margarida Abrantes, João Casalta-Lopes, Ana Cristina Gonçalves et al. "Cytotoxic Effects of Zoom® Whitening Product in Human Fibroblasts". Materials 13, n. 7 (25 marzo 2020): 1491. http://dx.doi.org/10.3390/ma13071491.

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Tooth whitening procedures are increasing; however, side effects can occur, such as damage to pulp cells, by the whitening products. This study aims to assess the cellular effects promoted by a whitening product, namely, the oxidative stress fostered by the active agent hydrogen peroxide, with and without photoactivation. Additionally, if cellular recovery occurred, we intended to determine the time point where cells recover from the tooth whitening induced damage. Human fibroblasts were exposed to hydrogen peroxide, Zoom®, Zoom® + irradiation, and irradiation alone. The following analysis was performed: metabolic activity evaluation by the MTT assay; cell viability, mitochondrial membrane potential, peroxides production, superoxide radical production, and reduced glutathione expression by flow cytometry. We determined the IC50 value for all groups, and a dose-dependent cytotoxic effect was verified. At the times analyzed, hydrogen peroxide groups showed no metabolic activity recovery while a cell recovery was observed after 24 h (Zoom®) and 48 h (Zoom® + irradiation). Cell death was seen in hydrogen peroxide and Zoom® + irradiation groups, mainly by apoptosis, and the irradiation had a cytotoxic effect per se. This in vitro study supports that whitening products with moderate hydrogen peroxide (HP) concentration have a temporary effect on cells, allowing a cellular recovery.

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Shvinka, Juris E., Lolita M. Pankova, Ineta N. Mežbårde e Leons J. Licis. "Hydrogen peroxide production by Zymomonas mobilis". Applied Microbiology and Biotechnology 31, n. 3 (settembre 1989): 240–45. http://dx.doi.org/10.1007/bf00258402.

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8

Hou, Yan, Fan Gong Kong, Shou Juan Wang e Gui Hua Yang. "Novel Gas Diffusion Electrode System for Effective Production of Hydrogen Peroxide". Applied Mechanics and Materials 496-500 (gennaio 2014): 159–62. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.159.

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Hydrogen peroxide production via cathodic reduction of oxygen on self-made gas diffusion electrode was investigated in an undivided electrochemical system. The effects of mass ratio between graphite and PTFE in cathode, the calcination temperature, current density, pH, and plate distance on hydrogen peroxide generation were discussed. The results showed that the self-made gas diffusion cathode had high catalyze capacity for production of hydrogen peroxide using cathodic oxygen-reducing reaction. The hydrogen peroxide concentration could reach 80.52 mg·L- 1 within 2 h. The optimal conditions for this system are as follows: mass ratio of graphite to PTFE in cathode, 21, calcination temperature, 300 °C, current density,4.69mA/cm2, pH 13.0, and the distance between anode and cathode, 8cm. The high concentration of hydrogen peroxide generated gives a promising application of this novel gas diffusion electrode system in pulp bleaching and waste-water treatment.

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9

Fukuzumi, Shunichi, e Yusuke Yamada. "Thermal and Photocatalytic Production of Hydrogen Peroxide and its Use in Hydrogen Peroxide Fuel Cells". Australian Journal of Chemistry 67, n. 3 (2014): 354. http://dx.doi.org/10.1071/ch13436.

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This mini review describes our recent developments on the thermal and photocatalytic production of hydrogen peroxide and its use in hydrogen peroxide fuel cells. Selective two-electron reduction of dioxygen to hydrogen peroxide by one-electron reductants has been made possible by using appropriate metal complexes with an acid. Protonation of the ligands of the complexes facilitates the reduction of O2. The photocatalytic two-electron reduction of dioxygen to hydrogen peroxide also occurs using organic photocatalysts and oxalic acid as an electron source in buffer solutions. The control of the water content and pH of a reaction solution is significant for improving the catalytic activity and durability. A hydrogen peroxide fuel cell can be operated with a one-compartment structure without a membrane, which is certainly more promising for the development of low-cost fuel cells as compared with two compartment hydrogen fuel cells that require membranes. Utilisation of iron complexes as cathode materials are reviewed.

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Leont'eva, S. V., M. R. Flid, M. A. Trushechkina, M. V. Babotina, V. R. Flid e A. V. Sulimov. "LOW-WASTE TECHNOLOGY OF GLYCIDOL PRODUCTION BY PEROXIDE METHOD". Fine Chemical Technologies 13, n. 3 (28 giugno 2018): 49–56. http://dx.doi.org/10.32362/24106593-2018-13-3-49-56.

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A technological process of manufacturing glycidol designed for the production capacity of 10 thousand tons per year and consisting in the direct oxidation of allyl alcohol with an aqueous solution of hydrogen peroxide in the presence of nanostructured titanium silicate in methanol is proposed. Due to the exothermic process, the solvent is not only a homogenizer of the mixture of the initial reagents of the epoxy process - allyl alcohol and hydrogen peroxide ensuring their interaction on the surface of the solid catalyst: it also prevents overheating of the reaction mass. On the basis of the research trial of the process the optimal parameters of the process were determined: temperature 30-40 °C; pressure 0.25 MPa; the initial hydrogen peroxide : allyl alcohol ratio = 1:(3-4) mass., methanol concentration in the reaction mixture 12-13 mol/l. Hydrogen peroxide conversion is 98%, the yield of the glycidol - 94%, the selectivity is no less than 95%. The process includes three main stages: (1) raw materials preparation, (2) liquid-phase epoxidation of allyl alcohol, (3) distillation of the target product. The scheme involves recirculation of unreacted allyl alcohol and the solvent - methanol. The developed technological process provides the following indicators (per 1 t of commercial glycidol): consumption of allyl alcohol no more than 0.843 t; consumption of hydrogen peroxide no more than 0.50 t (calculated for 100% hydrogen peroxide); consumption of methanol is no more than 0.022 tons All the waste products correspond to the 3-rd or 4-th hazard class.

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Più fonti

Tesi sul tema "Hydrogen peroxide production"

1

Dorward, Ann M. "Hydrogen peroxide production and autocrine proliferation control". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ66202.pdf.

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2

Clapp, Philip Anthony. "Studies on the production of hydrogen peroxide". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47810.

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3

Liu, Chang. "Electrochemical Hydrogen Peroxide Production Via Oxygen Reduction Reaction". Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29543.

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Hydrogen peroxide (H2O2) is a valuable chemical with rapidly growing demand in a variety of applications. At present, industrial production of H2O2 is through an energy-intensive anthraquinone process with high production costs and environmental hazards. Recently, the reported noble-metal based catalysts such as Pd-Au alloy, using renewable electricity to generate H2O2 via two-electron transferred oxygen reduction reaction (2e–-ORR), has received much attention. However, the cost and abundance of noble metals limit such catalysts for large-scale applications. To reduce the high overpotential requirement and improve the low yield of such noble metal catalysts, developing cost-efficient catalysts with high H2O2 selectivity and activity is a challenge that must be addressed immediately. Therefore, it is of great importance to design and synthesize electrocatalysts with abundant high-performance active sites for electrochemical H2O2 synthesis. In this thesis, by using a combination of theoretical calculation and experiments, I have demonstrated some effective approaches to tune the H2O2 generation performance on a series of structure-defined systems, including columbites (MNb2O6, M = Mn, Fe, Co, Ni and Cu), a porphyrin-based covalent organic framework (COF-366-M, M = Mn, Fe, Co, Ni, Cu and Zn) and a heterogeneous molecular catalyst system (HMC). In acid, neutral or alkaline conditions, I showcase the tunable H2O2 synthesis performance and identify the optimal composition and atomistic structure for these catalytic systems, paving the foundation for practical electrochemical H2O2 synthesis.

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4

Jana, Prabhas. "Environ-friendly production of hydrogen peroxide from direct catalytic liquid phase oxidation of hydrogen or hydrogen-containing compounds". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2007. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2571.

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Toy, Linda Jane. "Photochemical production, distribution, and decay of hydrogen peroxide in a humic pond". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ40489.pdf.

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6

Zhan, Bohan. "Synthesis and Use of Amyl Anthraquinone for the Production of Hydrogen Peroxide". Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517621.

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Macdonald, Anne Marie. "Sulphur dioxide oxidation in a rainband : effects of in-cloud hydrogen peroxide production". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55616.

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8

Bormann, Sebastian [Verfasser]. "Process engineering and heterologous enzyme production for hydrogen peroxide driven biocatalysis / Sebastian Bormann". Düren : Shaker, 2021. http://d-nb.info/1235301044/34.

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Das, Satyajit. "Production de celluloses pures à partir de pâte à papier par un procédé propre au peroxyde d'hydrogène catalysé". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00876881.

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L'objectif de ce travail est donc de développer un procédé industriel, propre, de production de cellulose pure à partir de pâte kraft non blanchie, basé sur la catalyse du peroxyde d'hydrogène et utilisant si nécessaire des traitements complémentaires sans chlore. A cet effet, deux approches sont adoptées : (i) délignification de pâte kraft avec du peroxyde d'hydrogène et (ii) purification de la pâte à la soude et ozone. La réaction du système cuivre-phénanthroline / peroxyde d'hydrogène avec un composé modèle de lignine non phénolique, l'alcool vératrylique a été étudié. L'effet du catalyseur sur la délignification et sur la dégradation des hydrates de carbone a été examiné. La purification des pâtes ainsi obtenues par une extraction alcaline à froid ainsi qu'un stade de blanchiment final à l'ozone. Enfin, il a été montré que les moléculaires des celluloses (DMM) des celluloses produites étaient comparables à celles des pâtes au bisulfite acide où pré-hydrolyse krafts utilisés pour les applications viscose.

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Noel, Hannah. "Enzymes and genes implicated in hydrogen peroxide production by the plant pathogen Botrytis cinerea". Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269257.

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Libri sul tema "Hydrogen peroxide production"

1

Kersten, Philip J. Involvement of a new enzyme, glyoxal oxidase, in estracellular Hb2sOb2s production by Phaneerochaete chrysosporium. [Madison, Wis.?: Forest Products Laboratory], 1988.

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2

Highley, Terry L. Determination of hydrogen peroxide production in Coriolus versicolor and Poria placenta during wood degradation. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1986.

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Highley, Terry L. Determination of hydrogen peroxide production in Coriolus versicolor and Poria placenta during wood degradation. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1986.

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Highley, Terry L. Determination of hydrogen peroxide production in Coriolus versicolor and Poria placenta during wood degradation. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1986.

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5

Kersten, Philip J. Involvement of a new enzyme, glyoxal oxidase, in extracellular Hb2sOb2s production by Phanerochaete chrysosporium. [Madison, Wis.?: Forest Products Laboratory], 1987.

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6

Syme, Jocelyn. The toxicity of lactate oxidase due to hydrogen peroxide production in the cell lines K-562 and H-209. Sudbury, Ont: Laurentian University, 1992.

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7

Rapid Production of Mixed-Base Hydrogen Peroxide by Direct-Contact Liquefied Nitrogen Evaporation; Process Design, Scale-Up, and Validation. Storming Media, 2004.

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Capitoli di libri sul tema "Hydrogen peroxide production"

1

Spina, Mary Beth, e Gerald Cohen. "Hydrogen Peroxide Production in Dopamine Neurons". In Oxygen Radicals in Biology and Medicine, 1011–14. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-5568-7_166.

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2

Schröder, Wolfgang P., e Hans-Erik Åkerlund. "Hydrogen Peroxide Production in Photosystem II Preparations". In Current Research in Photosynthesis, 901–4. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_209.

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3

De la Rosa, M. A., P. F. Heelis, K. K. Rao e D. O. Hall. "Flavin-mediated hydrogen peroxide production by biological and chemical photosystems". In Flavins and Flavoproteins 1987, a cura di D. E. Edmondson e D. B. McCormick, 597–600. Berlin, Boston: De Gruyter, 1987. http://dx.doi.org/10.1515/9783110884715-102.

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4

Goor, Gustaaf. "Hydrogen Peroxide: Manufacture and Industrial Use for Production of Organic Chemicals". In Catalysis by Metal Complexes, 13–43. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-0984-2_2.

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5

Krumschnabel, Gerhard, Mona Fontana-Ayoub, Zuzana Sumbalova, Juliana Heidler, Kathrin Gauper, Mario Fasching e Erich Gnaiger. "Simultaneous High-Resolution Measurement of Mitochondrial Respiration and Hydrogen Peroxide Production". In Methods in Molecular Biology, 245–61. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2257-4_22.

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Cohen, Gerald, e Mary Beth Spina. "Hydrogen Peroxide Production in Dopamine Neurons: Implications for Understanding Parkinson’s Disease". In Progress in Parkinson Research, 119–26. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0759-4_15.

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7

Wong, Hoi-Shan, Pierre-Axel Monternier, Adam L. Orr e Martin D. Brand. "Plate-Based Measurement of Superoxide and Hydrogen Peroxide Production by Isolated Mitochondria". In Mitochondrial Bioenergetics, 287–99. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7831-1_16.

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8

Kiran, Tugba Raika, e Aysun Bay Karabulut. "Free Radicals and Antioxidants in Diabetics". In Current Multidisciplinary Approach to Diabetes Mellitus Occurrence Mechanism, 45–56. Istanbul: Nobel Tip Kitabevleri, 2023. http://dx.doi.org/10.69860/nobel.9786053359104.5.

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In diabetics, there is an imbalance between free radicals and antioxidants, leading to oxidative stress, a condition characterized by increased production of reactive oxygen species (ROS) and impaired antioxidant defenses. Free radicals, such as superoxide anion (O2•−), hydroxyl radical (•OH), and hydrogen peroxide (H2O2), are generated as by-products of normal cellular metabolism and play a role in cell signaling and immune response. However, excessive ROS production in diabetes, exacerbated by hyperglycemia and insulin resistance, overwhelms antioxidant defenses, which include enzymatic antioxidants like superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx), as well as non-enzymatic antioxidants such as vitamin C, vitamin E, and glutathione. Oxidative stress in diabetics contributes to the pathogenesis of diabetic complications by damaging cellular proteins, lipids, and DNA, thereby impairing cellular function and promoting inflammation. Moreover, oxidative stress-induced endothelial dysfunction and damage to pancreatic beta cells further exacerbate insulin resistance and impaired glucose metabolism. Antioxidant therapies, either through dietary supplementation or pharmacological interventions, aim to restore redox balance and mitigate the detrimental effects of oxidative stress in diabetes. Understanding the intricate interplay between free radicals and antioxidants is essential for developing targeted strategies to prevent and manage diabetic complications effectively.

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Komlódi, Timea, Ondrej Sobotka, Gerhard Krumschnabel, Nicole Bezuidenhout, Elisabeth Hiller, Carolina Doerrier e Erich Gnaiger. "Comparison of Mitochondrial Incubation Media for Measurement of Respiration and Hydrogen Peroxide Production". In Mitochondrial Bioenergetics, 137–55. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7831-1_8.

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Ghriss, Ons, Hédi Ben Amour, Mohamed-Razak Jeday e Hassen Chekir. "Nitrogen Oxide Removal from Nitric Acid Production Process by Absorption into Hydrogen Peroxide Solution". In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1017–19. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_293.

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Atti di convegni sul tema "Hydrogen peroxide production"

1

Ventura, M., e S. Yuan. "Commercial production and use of hydrogen peroxide". In 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-3556.

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Ando, Yuji, e Tadayoshi Tanaka. "Proposal of Simultaneous Production Method of Hydrogen and Hydrogen Peroxide From Water Using Solar Photo-Electrochemistry". In ASME 2003 International Solar Energy Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/isec2003-44203.

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Authors have proposed a new hydrogen production system that simultaneously synthesizes hydrogen and hydrogen peroxide from water by electrochemical reaction. Experimental apparatus of this system is composed of a hydrogen electrode with platinum mesh, a hydrogen peroxide electrode with carbon material and an electrolyte with Nafion®. In this paper, the superiority of this system is outlined. In addition, the experimental results of electrolytic synthesis of hydrogen and hydrogen peroxide from water are reported. Furthermore, the possibility of the system that synthesizes hydrogen and hydrogen peroxide from water by the photochemical reaction using solar radiation is also discussed.

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3

Yang, Shidong, Lanhe Zhang, Fengguo Cui e Jun Ma. "Production of Hydrogen Peroxide by Pulsed High Voltage Discharge in Water". In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2009). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163248.

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Valencia Gattas, M., M. Salathe e GE Conner. "Duox2 Expression Regulates Basal Hydrogen Peroxide Production in Airway Epithelial Cells." In American Thoracic Society 2009 International Conference, May 15-20, 2009 • San Diego, California. American Thoracic Society, 2009. http://dx.doi.org/10.1164/ajrccm-conference.2009.179.1_meetingabstracts.a4171.

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Denton, Michael L., Debbie M. Eikum, David J. Stolarski, Gary D. Noojin, Robert J. Thomas, Randolph D. Glickman e Benjamin A. Rockwell. "Hydrogen peroxide production in cultured RPE cells exposed to near-infrared lasers". In International Symposium on Biomedical Optics, a cura di Steven L. Jacques, Donald D. Duncan, Sean J. Kirkpatrick e Andres Kriete. SPIE, 2002. http://dx.doi.org/10.1117/12.472518.

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Kivanç, Merih, Demet Yazicioğlu e Emine Dinçer. "Lactic acid bacteria from the vagina of healthy Turkish women: identification, hydrogen peroxide production". In Proceedings of the III International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2009). WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322119_0110.

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KOMAGOE, K., S. OSADA, T. SHINDO e K. TAMAGAKE. "CHEMILUMINESCENCE STUDIES ON THE PHOTOCHEMICAL PRODUCTION OF HYDROGEN PEROXIDE FROM PORPHYRINS AND THEIR AGGREGATES". In Proceedings of the 13th International Symposium. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812702203_0038.

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Vetrovec, John. "Electrochemical production of basic hydrogen peroxide and chlorine for use in chemical oxygen-iodine laser". In Twelfth International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference. SPIE, 1998. http://dx.doi.org/10.1117/12.334447.

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Stefanescu, Mihai, Costel Bumbac e Ionut Cristea. "ADVANCED REMOVAL OF GAMMA HCH FROM WATER BY ULTRASONICATION, FENTON AND PHOTO FENTON ULTRASONICATION". In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023v/3.2/s12.02.

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Historical pollution with hexachlorocyclohexane (HCH) isomers of soil and groundwater unfortunately is an unsolved problem, especially in some countries where Lindane is still produced, as also in Europe in the surrounding areas of former production sites or landfilling sites usually due to inadequate long-term storage, treatment or recovery of these wastes. HCH removal technologies are usually dedicated to soil remediation, leachate treatment, water and wastewater treatment. This paper presents the research efforts to develop a treatment technology for gamma HCH removal from water matrices by advanced oxidation processes (AOPs) based on ultrasonication, Fenton and photo Fenton oxidation. Five treatment systems were assessed comparatively: direct ultrasonication, oxidation with hydrogen peroxide, ultrasonication with hydrogen peroxide, Fenton ultrasonication and Fenton ultrasonication followed by photo Fenton oxidation. The energy (25-800 kJ) and amplitude of ultrasonic field, initial concentration of HCH (10 - 89 ?g/L), hydrogen peroxide (1 - 4000 x stoichiometric dose), iron (Fe II) doses (1-15 mg/L) and UV irradiation time (30-60 min.) were the main experimental parameters evaluated. The ultrasonic frequency was constant - 20 kHz in all experiments. Best treatment performance of 99.9% HCH removal efficiency was achieved after application of a treatment train combining Fenton ultrasonication followed by Fenton UV photolysis at the main experimental parameters of: 200 kJ ultrasonic energy, 1000 x s peroxide dose, 5 mg Fe(II)/L and 30 minutes of UV irradiation.

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Askarova, A. G., K. V. Maerle, E. Y. Popov, S. E. Malaniy, P. A. Grishin, O. V. Slavkina e A. N. Cheremisin. "Perspectives of Hydrogen Peroxide Injection to the Carbonate Reservoir for ISC Initiation". In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216649-ms.

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Abstract As part of laboratory and numerical investigations, an assessment of hydrogen peroxide (H2O2) injection efficiency was performed to estimate the ability of H2O2 to increase the productivity of heavy oil field development. The combined effect can be observed, including heat release due to H2O2 decomposition and oxidative reactions with oil during the in situ combustion (ISC) process and increased oil mobility due to CO2 dissolution. Laboratory experiments were performed on an autoclave to study the decomposition of peroxide in conditions close to the reservoir (pressure and temperature) and obtain experimental values of the kinetic parameters of the H2O2 decomposition reaction. Further, these values and experimental parameters were integrated into a homogenous numerical model representing the target oil reservoir. Also, during the laboratory experiment, the optimal value of the H2O2 concentration was determined for subsequent sensitivity analysis. The numerical model was then used to build a Tornado diagram and to estimate the effects of preheating, operational parameters, reservoir properties and kinetic parameters with or without catalysts in the system. According to the results of the hydrodynamic modeling, efficient heating of the formation to high temperatures (over 100°C) during the injection and decomposition of H2O2 is possible only in the presence of a catalyst. The bottomhole formation zone temperature with a catalyst can reach up to 350°C. The most significant influence on the cumulative production is provided by the injection rate, reservoir permeability, initial temperature of the injecting fluid, as well as the thermal properties of the rock. When the temperature reaches 300°C, the reaction of peroxide decomposition begins to accompany the ISC of oil, which is self-initiated, since there is a sufficient amount of oxygen in the formation formed during the decomposition of H2O2. An effective application of the technology is possible during a sufficiently fast rate of the peroxide decomposition to avoid the dissipation of the released heat due to two possible mechanisms: heating (up to ~150°С) of injected agent (effective, but it is associated with additional costs for equipment and technological risks);use of widely available and cheap catalysts. As a result of the work, the most promising strategies of H2O2 injection technology for heating a carbonate reservoir were identified. The option of full-scale injection of the H2O2 is associated with high costs and limited development rates. This method can be applied to objects with specific conditions of elevated temperatures where the peroxide decomposition reaction will be the most active.

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Rapporti di organizzazioni sul tema "Hydrogen peroxide production"

1

Dong, D., G. F. Vandegrift, S. Amini, J. B. Hersubeno, H. Nasution e Y. Nampira. Processing of LEU targets for {sup 99}Mo production -- Dissolution of metal foil targets by alkaline hydrogen peroxide. Office of Scientific and Technical Information (OSTI), settembre 1995. http://dx.doi.org/10.2172/195648.

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Hurley, James A., Lixiong Li, Timothy A. Spears, Jr Nichols, Owens Robert K. e Hugh M. Rapid Production of Mixed-Base Hydrogen Peroxide by Direct-Contact Liquefied Nitrogen Evaporation; Process Design, Scale-Up, and Validation. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2004. http://dx.doi.org/10.21236/ada422994.

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Dudareva, Natalia, Alexander Vainstein, Eran Pichersky e David Weiss. Integrating biochemical and genomic approaches to elucidate C6-C2 volatile production: improvement of floral scent and fruit aroma. United States Department of Agriculture, settembre 2007. http://dx.doi.org/10.32747/2007.7696514.bard.

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The specific objectives of approved proposal include to: 1. Elucidate the C6-C2 biochemical pathways leading to the biosynthesis of phenylacetaldehyde, phenylethyl alcohol and phenylethyl acetate in floral tissues of ornamentally important plants, pefunia and roses. 2. Isolate and characterrze genes responsible for the production of these C6-C2 compounds and those involved in the regulation of the pathway using genomic and transcriptomic tools. 3. Determine whether altering the expression of key genes of this pathway can result in changing the aroma characteristics of flowers. Aldehydes are intermediates in a variety of biochemical pathways including those involved in the metabolism of carbohydrates, vitamins, steroids, amino acids, benzylisoquinoline alkaloids, hormones, and lipids. In plants they are also synthesized in response to environmental stresses such as salinity, cold, and heat shock or as flavors and aromas in fruits and flowers. Phenylacetaldehyde along with 2-phenylethanol and its acetate ester, are important scent compounds in numerous flowers, including petunias and roses. However, little is known about the biosynthesis of these volatile compounds in plants. We have shown that the formation PHA and 2-phenylethanol from Phe does not occur via trans-cinnamic acid and instead competes with the key enzyme of phenypropanoid metabolism Pheammonia-lyase (PAL) for Phe utilization. Using functional genomic approach and comparative gene expression profiling, we have isolated and characterized a novel enzyme from petunia and rose flowers that catalyzes the formation of the Ca-Czcompound phenylacetaldehyde (PHA) from L-phenylalanine (Phe) by the removal of both the carboxyl and amino groups. This enzyme, designated as phenylacetaldehyde synthases (PAAS), is a bifunctional enzyme that catalyzes the unprecedented efficient coupling of phenylalanine decarboxylation to oxidation, generating phenylacetaldehyde, CO2, ammonia, and hydrogen peroxide in stoichiometric amounts. Down-regulation of PAAS expression via RNA interference-based (RNAi) technology in petunia resulted in no PHA emission when compared with controls. These plants also produced no 2-phenylethanol, supporting our conclusion that PHA is a precursor of 2-phenylethanol. To understand the regulation of scent formation in plants we have also generated transgenic petunia and tobacco plants expressing the rose alcohol acetyltransferase (RhAAT) gene under the control of a CaMV-35S promoter. Although the preferred substrate of RhAAT in vitro is geraniol, in transgenic petunia flowers, it used phenylethyl alcohol and benzyl alcohol to produce the corresponding acetate esters, not generated by control flowers. These results strongly point to the dependence of volatile production on substrate availability. Analysis of the diurnal regulation of scent production in rose flowers revealed that although the daily emission of most scent compounds is synchronized, various independently evolved mechanisms control the production, accumulation and release of different volatiles. This research resulted in a fundamental discovery of biochemical pathway, enzymes and genes involved in biosynthesis of C6-C2s compounds, and provided the knowledge for future engineering plants for improved scent quality.

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Cohen, Roni, Kevin Crosby, Menahem Edelstein, John Jifon, Beny Aloni, Nurit Katzir, Haim Nerson e Daniel Leskovar. Grafting as a strategy for disease and stress management in muskmelon production. United States Department of Agriculture, gennaio 2004. http://dx.doi.org/10.32747/2004.7613874.bard.

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The overall objective of this research was to elucidate the horticultural, pathological, physiological and molecular factors impacting melon varieties (scion) grafted onto M. cannonballus resistant melon and squash rootstocks. Specific objectives were- to compare the performance of resistant melon germplasm (grafted and non-grafted) when exposed to M. cannoballus in the Lower Rio Grande valley and the Wintergarden, Texas, and in the Arava valley, Israel; to address inter-species relationships between a Monosporascus resistant melon rootstock and susceptible melon scions in terms of fruit-set, fruit quality and yield; to study the factors which determine the compatibility between the rootstock and the scion in melon; to compare the responses of graft unions of differing compatibilities under disease stress, high temperatures, deficit irrigation, and salinity stress; and to investigate the effect of rootstock on stress related gene expression in the scion. Some revisions were- to include watermelon in the Texas investigations since it is much more economically important to the state, and also to evaluate additional vine decline pathogens Didymella bryoniae and Macrophomina phaseolina. Current strategies for managing vine decline rely heavily on soil fumigation with methyl bromide, but restrictions on its use have increased the need for alternative management strategies. Grafting of commercial melon varieties onto resistant rootstocks with vigorous root systems is an alternative to methyl bromide for Monosporascus root rot/vine decline (MRR/VD) management in melon production. Extensive selection and breeding has already produced potential melon rootstock lines with vigorous root systems and disease resistance. Melons can also be grafted onto Cucurbita spp., providing nonspecific but efficient protection from a wide range of soil-borne diseases and against some abiotic stresses, but compatibility between the scion and the rootstock can be problematic. During the first year experiments to evaluate resistance to the vine decline pathogens Monosporascus cannonballus, Didymella bryoniae, and Macrophomina phaseolina in melon and squash rootstocks proved the efficacy of these grafted plants in improving yield and quality. Sugars and fruit size were better in grafted versus non-grafted plants in both Texas and Israel. Two melons (1207 and 124104) and one pumpkin, Tetsukabuto, were identified as the best candidate rootstocks in Texas field trials, while in Israel, the pumpkin rootstock RS59 performed best. Additionally, three hybrid melon rootstocks demonstrated excellent resistance to both M. cannonballus and D. bryoniae in inoculated tests, suggesting that further screening for fruit quality and yield should be conducted. Experiments with ABA in Uvalde demonstrated a significant increase in drought stress tolerance and concurrent reduction in transplant shock due to reduced transpiration for ‘Caravelle’ plants. In Israel, auxin was implicated in reducing root development and contributing to increased hydrogen peroxide, which may explain incompatibility reactions with some squash rootstocks. However, trellised plants responded favorably to auxin (NAA) application at the time of fruit development. Gene expression analyses in Israel identified several cDNAs which may code for phloem related proteins, cyclins or other factors which impact the graft compatibility. Manipulation of these genes by transformation or traditional breeding may lead to improved rootstock cultivars. Commercial applications of the new melon rootstocks as well as the ABA and TIBA growth regulators have potential to improve the success of grafted melons in both Israel and Texas. The disease resistance, fruit quality and yield data generated by the field trials will help producers in both locations to decide what rootstock/scion combinations will be best.

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Droby, Samir, Michael Wisniewski, Ron Porat e Dumitru Macarisin. Role of Reactive Oxygen Species (ROS) in Tritrophic Interactions in Postharvest Biocontrol Systems. United States Department of Agriculture, dicembre 2012. http://dx.doi.org/10.32747/2012.7594390.bard.

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To elucidate the role of ROS in the tri-trophic interactions in postharvest biocontrol systems a detailed molecular and biochemical investigation was undertaken. The application of the yeast biocontrol agent Metschnikowia fructicola, microarray analysis was performed on grapefruit surface wounds using an Affymetrix Citrus GeneChip. the data indicated that 1007 putative unigenes showed significant expression changes following wounding and yeast application relative to wounded controls. The expression of the genes encoding Respiratory burst oxidase (Rbo), mitogen-activated protein kinase (MAPK) and mitogen-activated protein kinase kinase (MAPKK), G-proteins, chitinase (CHI), phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS) and 4-coumarate-CoA ligase (4CL). In contrast, three genes, peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT), were down-regulated in grapefruit peel tissue treated with yeast cells. The yeast antagonists, Metschnikowia fructicola (strain 277) and Candida oleophila (strain 182) generate relatively high levels of super oxide anion (O2−) following its interaction with wounded fruit surface. Using laser scanning confocal microscopy we observed that the application of M. fructicola and C. oleophila into citrus and apple fruit wounds correlated with an increase in H2O2 accumulation in host tissue. The present data, together with our earlier discovery of the importance of H₂O₂ production in the defense response of citrus flavedo to postharvest pathogens, indicate that the yeast-induced oxidative response in fruit exocarp may be associated with the ability of specific yeast species to serve as biocontrol agents for the management of postharvest diseases. Effect of ROS on yeast cells was also studied. Pretreatment of the yeast, Candida oleophila, with 5 mM H₂O₂ for 30 min (sublethal) increased yeast tolerance to subsequent lethal levels of oxidative stress (50 mM H₂O₂), high temperature (40 °C), and low pH (pH 4). Suppression subtractive hybridization analysis was used to identify genes expressed in yeast in response to sublethal oxidative stress. Transcript levels were confirmed using semi quantitative reverse transcription-PCR. Seven antioxidant genes were up regulated. Pretreatment of the yeast antagonist Candida oleophila with glycine betaine (GB) increases oxidative stress tolerance in the microenvironment of apple wounds. ROS production is greater when yeast antagonists used as biocontrol agents are applied in the wounds. Compared to untreated control yeast cells, GB-treated cells recovered from the oxidative stress environment of apple wounds exhibited less accumulation of ROS and lower levels of oxidative damage to cellular proteins and lipids. Additionally, GB-treated yeast exhibited greater biocontrol activity against Penicillium expansum and Botrytis cinerea, and faster growth in wounds of apple fruits compared to untreated yeast. The expression of major antioxidant genes, including peroxisomal catalase, peroxiredoxin TSA1, and glutathione peroxidase was elevated in the yeast by GB treatment. A mild heat shock (HS) pretreatment (30 min at 40 1C) improved the tolerance of M. fructicola to subsequent high temperature (45 1C, 20–30 min) and oxidative stress (0.4 mol-¹) hydrogen peroxide, 20–60 min). HS-treated yeast cells showed less accumulation of reactive oxygen species (ROS) than non-treated cells in response to both stresses. Additionally, HS-treated yeast exhibited significantly greater (P≥0.0001) biocontrol activity against Penicillium expansum and a significantly faster (Po0.0001) growth rate in wounds of apple fruits stored at 25 1C compared with the performance of untreated yeast cells. Transcription of a trehalose-6-phosphate synthase gene (TPS1) was up regulated in response to HS and trehalose content also increased.

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