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Journal articles on the topic 'Lead peroxide'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Veal, Elizabeth A., Lewis E. Tomalin, Brian A. Morgan, and Alison M. Day. "The fission yeast Schizosaccharomyces pombe as a model to understand how peroxiredoxins influence cell responses to hydrogen peroxide." Biochemical Society Transactions 42, no. 4 (2014): 909–16. http://dx.doi.org/10.1042/bst20140059.

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As a more selectively reactive oxygen species, H2O2 (hydrogen peroxide) has been co-opted as a signalling molecule, but high levels can still lead to lethal amounts of cell damage. 2-Cys Prxs (peroxiredoxins) are ubiquitous thioredoxin peroxidases which utilize reversibly oxidized catalytic cysteine residues to reduce peroxides. As such, Prxs potentially make an important contribution to the repertoire of cell defences against oxidative damage. Although the abundance of eukaryotic 2-Cys Prxs suggests an important role in maintaining cell redox, the surprising sensitivity of their thioredoxin p

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Przymusiński, Roman, Renata Rucińska-Sobkowiak, Bogna Ilska, and Edward A. Gwóźdź. "Organospecific responses of lupin seedlings to lead Localization of hydrogen peroxide and peroxidase activity." Acta Physiologiae Plantarum 29, no. 5 (2007): 411–16. http://dx.doi.org/10.1007/s11738-007-0049-y.

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3

van Gorp, Roosje M. A., Jos L. V. Broers, Chris P. M. Reutelingsperger, et al. "Peroxide-induced membrane blebbing in endothelial cells associated with glutathione oxidation but not apoptosis." American Journal of Physiology-Cell Physiology 277, no. 1 (1999): C20—C28. http://dx.doi.org/10.1152/ajpcell.1999.277.1.c20.

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Cells under oxidative stress induced by peroxides undergo functional and morphological changes, which often resemble those observed during apoptosis. Peroxides, however, also cause the oxidation of intracellular reduced glutathione (GSH). We investigated the relation between these peroxide-induced effects by using human umbilical vein endothelial cells (HUVEC) and two HUVEC-derived cell lines, ECRF24 and ECV304. With HUVEC, tert-butyl hydroperoxide ( tBH) or hydrogen peroxide application in the presence of serum induced, in a dose-dependent way, reorganization of the actin cytoskeleton, membra

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BITEUR, Nadjet, Abdelkader AOUES, Omar KHAROUBI, and Miloud SLIMANI. "Oxidative Stress Induction by Lead in Leaves of Radish (Raphanus sativus) Seedlings." Notulae Scientia Biologicae 3, no. 4 (2011): 93–99. http://dx.doi.org/10.15835/nsb346360.

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Oxidative stress was induced by lead acetate (Pb) in Raphanus sativus seedlings grown in a hydroponic system using sand as substrate. Thirty day old acclimated seeds were treated for 7 days with five Pb levels (0 as control, 100, 200, 500 and 1000 mg l-1). Parameters such as growth, oxidative damage markers (lipid peroxidation, protein oxidation and hydrogen peroxide contents) and enzymatic activities of catalase (CAT) and peroxidase (POD) were investigated. Lead concentration in plant tissues increased with increasing of Pb levels. Shoot fresh weight, chlorophyll and carotenoid concentration

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Pinheiro, Inês Moreira Vilanova, and Liu Yao Cho. "The Influence of Oxidizing Agent in the Chemical Deposition of Polypyrrole on Lead Alloy Surface." Journal of Materials Science Research 9, no. 1 (2019): 1. http://dx.doi.org/10.5539/jmsr.v9n1p1.

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Polypyrrole (PPy) layers were deposited on lead metallic surface using hydrogen peroxide or benzoyl peroxide as oxidizing agent associated with different types of dopants: phosphoric acid, stearic acid and dodecylbenzene sulfonic acid. Lead alloy was chosen because of its importance in energy industrial application and also because its primary source of extraction is running out, there is an increasingly urgent need to extend its life cycle. For the in situ chemical deposition of PPy, it was considered the combination of only one oxidizing agent and one dopant, being the experiment performed w

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Van Craeynest, K., J. Dewulf, S. Vandeburie, and H. Van Langenhove. "Removal of trichloroethylene from waste gases via the peroxone process." Water Science and Technology 48, no. 3 (2003): 65–72. http://dx.doi.org/10.2166/wst.2003.0163.

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In dealing with chlorinated organic compounds in waste gases, traditional treatment techniques show some severe shortcomings. Thermal oxidation may lead to the formation of dioxins, active carbon adsorption does not degrade the pollutants and biotechnological treatment is difficult since microorganisms do not always possess efficient degradation pathways for these compounds. These drawbacks explain the growing interest of the waste gas treatment sector for Advanced Oxidation Processes (AOPs) which were initially developed as water treatment techniques. AOPs generate highly reactive hydroxyl ra

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Djuric, Vladan, Nebojsa Deletic, Vesna Stankov-Jovanovic, and Ranko Simonovic. "Inhibitory effect of retinol acetate on horseradish peroxidase." Chemical Industry 67, no. 3 (2013): 419–26. http://dx.doi.org/10.2298/hemind120602095d.

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Primary role of peroxidase enzyme is to decompose endogenous hydrogen peroxide, when oxygen radical is being replaced by a less potent radical, which is its cosubstrates oxidized form. During this study, catalytic activity of horseradish peroxidase has been observed in the presence of antioxidants from vitamin group, such as C, E and A, i.e. their water-soluble forms. It was found that vitamin E showed no effect on the enzyme activity and fate of cosubstrate radicals from the group of benzidine derivatives. Vitamin C proceeds enzymatic reaction showing its antioxidative character, and absorbs

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Zárate-Gutiérrez, R., L. Gregorio-Vázquez, and G. T. Lapidus. "Selective leaching of lead from a lead–silver–zinc concentrate with hydrogen peroxide in citrate solutions." Canadian Metallurgical Quarterly 54, no. 3 (2015): 305–9. http://dx.doi.org/10.1179/1879139515y.0000000020.

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9

Jima, Bariq Bahmman, and Najwa Saber Majeed. "Oxidation Desulphurization of Heavy Naphtha Improved by Ultrasound Waves." Iraqi Journal of Chemical and Petroleum Engineering 21, no. 1 (2020): 9–14. http://dx.doi.org/10.31699/ijcpe.2020.1.2.

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The oxidation desulphurization assisted by ultrasound waves was applied to the desulphurization of heavy naphtha. Hydrogen peroxide and acetic acid were used as oxidants, ultrasound waves as phase dispersion, and activated carbon as solid adsorbent. When the oxidation desulphurization (ODS) process was followed by a solid adsorption step, the performance of overall Sulphur removal was 89% for heavy naphtha at the normal condition of pressure and temperature. The process of (ODS) converts the compounds of Sulphur to sulfoxides/ sulfones, and these oxidizing compounds can be removed by activated

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10

Amalia, Dessy, Yunita Ramanda, and Maryono Maryono. "Extraction of lead from galena concentrates using fluosilicic acid and peroxide." Indonesian Mining Journal 20, no. 1 (2017): 69–80. http://dx.doi.org/10.30556/imj.vol20.no1.2017.187.

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11

Thomas, J. D. R. "Ion-selective electrode and enzyme sensors for flow-type environmental analysis." Collection of Czechoslovak Chemical Communications 56, no. 1 (1991): 178–91. http://dx.doi.org/10.1135/cccc19910178.

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Illustrative examples from researches in the author’s laboratories are given of potentiometric ion-selective electrodes (ISEs) and catalytic membrane amperometric electrodes suitable for environmental analysis. The uses of sulphide ISEs are demonstrated for monitoring the activities of sulphate-reducing bacteria, in effluent analysis for sulphide, and in process/effluent analysis for sulphide, thiols and polysulphides. Diquat and paraquat ISEs are discussed in relation to their optimisation in terms of appropriate crown ether and ion-pairing agents, together with prospects of their uses. Catal

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12

Suratno, Suratno, and Ronny Victor Utomo. "Bilangan Peroksida pada Minyak Goreng Penjual Gorengan di Jalan Rajawali Kota Palangka Raya." Borneo Journal of Medical Laboratory Technology 1, no. 1 (2019): 25–29. http://dx.doi.org/10.33084/bjmlt.v1i1.461.

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A high peroxide value of used vegetable oil can lead to poisoning in the body and various diseases such as diarrhea, fat deposition in blood vessels, cancer and decrease of digestibility of fat and destruction of vitamin E. This study aims to determine the peroxide values in reused cooking oil on fried snack seller on Jalan Rajawali, Palangka Raya. A quantitative descriptive research design was used in this study. Random sampling technique was used to collect the sample � determination of peroxide value using iodometry method. Results show that based on quality requirements, from 14 cooking oi

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Raab, Luise, Ute Henniges, and Irene Brückle. "Eliminating Hydrogen Peroxide Volatiles after Lead White Conversion Treatment Via Sorption Agents." Restaurator. International Journal for the Preservation of Library and Archival Material 41, no. 2 (2020): 101–17. http://dx.doi.org/10.1515/res-2019-0022.

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AbstractHydrogen peroxide (HP) residues that remain after the conversion of blackened lead white may cause unwanted paper discolouration and degradation. Four VOCs sorption materials were tested for their ability to eliminate HP gas evolving from the treated substrate. This was tested by measuring the change in HP concentration in aqueous solution and in an enclosed air space in the presence of MicroChamber® Interleaving Paper, Corrosion Intercept® film, Zorflex® activated carbon cloth (ACC) and iron sulphate-impregnated paper. Detection with the colour indicator Quantofix® test strips and a D

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Li, R. G., T. T. Li, L. Hao, X. Xu, and J. Na. "Hydrogen Peroxide Reduces Lead-Induced Oxidative Stress to Mouse Brain and Liver." Bulletin of Environmental Contamination and Toxicology 82, no. 4 (2008): 419–22. http://dx.doi.org/10.1007/s00128-008-9599-y.

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Adebayo, Albert Ojo, Matthew Ayorinde Adebayo, Emmanuel Folorunso Olasehinde, and Olayemi Onaopemipo Ojo. "Leaching Kinetics of Lead from Galena Using Hydrogen Peroxide and Trichloroacetic Acid." Journal of Hazardous, Toxic, and Radioactive Waste 25, no. 3 (2021): 04021010. http://dx.doi.org/10.1061/(asce)hz.2153-5515.0000608.

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16

Modhave, Dattatray, Brenda Barrios, and Amrit Paudel. "PVP-H2O2 Complex as a New Stressor for the Accelerated Oxidation Study of Pharmaceutical Solids." Pharmaceutics 11, no. 9 (2019): 457. http://dx.doi.org/10.3390/pharmaceutics11090457.

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Reactive impurities, such as hydrogen peroxide in excipients, raise a great concern over the chemical stability of pharmaceutical products. Traditional screening methods of spiking impurities into solid drug-excipient mixtures oversimplify the micro-environment and the physical state of such impurities in real dosage form. This can lead to an inaccurate prediction of the long-term product stability. This study presents the feasibility of using a polyvinylpyrrolidone-hydrogen peroxide complex (PVP-H2O2) as an oxidative agent for the solid state forced degradation of a selected drug, vortioxetin

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17

HART, PETER W., CARL HOUTMAN, and KOLBY HIRTH. "Hydrogen peroxide and caustic soda: Dancing with a dragon while bleaching." TAPPI Journal 12, no. 7 (2013): 59–65. http://dx.doi.org/10.32964/tj12.7.59.

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When hydrogen peroxide is mixed with caustic soda, an auto-accelerating reaction can lead to generation of significant amounts of heat and oxygen. On the basis of experiments using typical pulp mill process concentration and temperatures, a relatively simple kinetic model has been developed. Evaluation of these model results reveals that hydrogen peroxide-caustic soda systems are extremely sensitive to hydrogen peroxide:caustic soda ratio, transition metal contamination, and temperature. Small changes in initial conditions can result in a closed system becoming explosive. Analysis of model res

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Jyotsna A Patil, Mandakini S Kshirsagar, and Arun J Patil. "Activated Carbon Fabric Respiratory Mask reduces Blood Lead, Oxidative Stress and Improves the Antioxidant Status and Liver Functions in Unorganised Battery Workers." International Journal of Research in Pharmaceutical Sciences 11, no. 4 (2020): 7247–53. http://dx.doi.org/10.26452/ijrps.v11i4.3857.

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Effect of use of Activated Carbon Fabric (ACF) mask on blood lead (PbB), lipid peroxide, erythrocytes-Superoxide Dismutase (SOD), Catalase, Ceruloplasmin, and liver functions tests of battery manufacturing workers (BMW) were studied. For this study, 36 male battery manufacturing workers, those who are regularly using ACF mask for two months were included. A blood sample was collected before and after using ACF masks from battery manufacturing workers and estimated the blood lead level, liver function tests, oxidative stress, and antioxidant status parameters by using the standard method. After

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Šubrt, Jan, Eva Pližingrová, Monika Palkovská, et al. "Titania aerogels with tailored nano and microstructure: comparison of lyophilization and supercritical drying." Pure and Applied Chemistry 89, no. 4 (2017): 501–9. http://dx.doi.org/10.1515/pac-2016-1031.

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AbstractStructure and phase composition of titania aerogels can be substantially influenced simply by the process of drying their parent water colloid suspensions prepared by the reaction of hydrogen peroxide with suspension of precipitates obtained by neutralization of solution of titanyl sulfate with ammonia. Two methods of drying are compared: (1) lyophilization of fast frozen material immersed in liquid nitrogen, and (2) critical point drying using supercritical CO2 under high pressure. Both methods of drying lead to yellow titanium peroxide aerogels consisting of nanometer-sized blocks. W

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Sun, Yujun, Michael Fenster, Annie Yu, Richard M. Berry, and Dimitris S. Argyropoulos. "The effect of metal ions on the reaction of hydrogen peroxide with Kraft lignin model compounds." Canadian Journal of Chemistry 77, no. 5-6 (1999): 667–75. http://dx.doi.org/10.1139/v99-036.

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Peroxide bleaching is significantly affected by transition and alkaline earth metals. Isolating the effects of different transition and alkaline earth metals on the reactions of peroxide with different representative lignin structures allows the separation of the positive from the negative contributions of these metal ions. In this work, five monomeric or dimeric phenolic lignin model compounds were treated with alkaline hydrogen peroxide in the absence or presence of Mn2+, Cu2+, Fe3+, and Mg2+. We followed the disappearance of the starting material and the progress of demethylation, radical c

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21

Camargo, Emerson R., and Masato Kakihana. "Peroxide-Based Route Free from Halides for the Synthesis of Lead Titanate Powder." Chemistry of Materials 13, no. 4 (2001): 1181–84. http://dx.doi.org/10.1021/cm000363y.

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22

Patil, Vishvanath D., Jaymala Patil, Priyanka Rege, and Ganesh Dere. "Mild and Efficient Synthesis of Benzimidazole Using Lead Peroxide Under Solvent-Free Conditions." Synthetic Communications 41, no. 1 (2010): 58–62. http://dx.doi.org/10.1080/00397910903531789.

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23

Dursun, Nurcan, Pakize Dogan, and Hamiyet Donmez. "Plasma and Erythrocyte Lipid Peroxide Levels in Workers with Occupational Exposure to Lead." Biological Trace Element Research 82, no. 1-3 (2001): 029–34. http://dx.doi.org/10.1385/bter:82:1-3:029.

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24

Sirivarasai, Jintana, Sukhumpun Kaojarern, Suwannee Chanprasertyothin, et al. "Environmental Lead Exposure, Catalase Gene, and Markers of Antioxidant and Oxidative Stress Relation to Hypertension: An Analysis Based on the EGAT Study." BioMed Research International 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/856319.

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Lead has been linked to the development of hypertension via oxidative stress. Catalase plays an important role in the disposal of hydrogen peroxide in erythrocyte and its activity was determined by CAT gene. The aims of this study were to investigate (1) the association between blood levels of antioxidant markers such as catalase, superoxide dismutase, glutathione, glutathione peroxidase, oxidative stress-marker (malondialdehyde), and blood lead level and (2) the influence of genetic polymorphism of CAT gene (rs769217) on change in blood pressure in general population of EGAT study project. Th

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Ito, Sayo, Takashi Okuno, Hiroki Itoh, et al. "Chemical Basis for High Activity in Oxygenation of Cyclohexane Catalyzed by Dinuclear Iron(III) Complexes with Ethereal Oxygen Containing Ligand and Hydrogen Peroxide System." Zeitschrift für Naturforschung B 52, no. 6 (1997): 719–27. http://dx.doi.org/10.1515/znb-1997-0609.

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Abstract The crystal structures of two binuclear iron(III) complexes with linear μ-oxo bridge, Fe2OCl2 (tfpy)2 (ClO4)2 ·2CH3CN and Fe2OCl2(epy)2(ClO4)2 were determined, where (tfpy) and (epy) represent N,N-bis(2-pyridylmethyl)-tetrahydrofurfurylamine and N,N-bis(2-pyridylmethyl)-2-ethoxyethylamine, respectively. Their structural features are essentially the same as that of the corresponding linear binuclear complex with (tpa)-complex, Fe2OCl2(tpa)2(ClO4)2, where (tpa) is tris(2-pyridylmethyl)amine; the ligands (tfpy) and (epy) act as a tetradentate tripod-like ligand, and Fe-O (ethereal oxygen

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Estrada-Montoya, Claudia Catalina, Gloria Maria Restrepo Franco, and Narmer Fernando Galeano Vanegas. "Evaluation of cyanide and heavy metals removal in liquid effluents from small mining’s gold benefit, by adsorption with activated carbon and hydrogen peroxide in Segovia, Antioquia." DYNA 87, no. 212 (2020): 9–17. http://dx.doi.org/10.15446/dyna.v87n212.79716.

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The small gold mining generates toxic substances discharges, being an environmental problem. The objective was to evaluate the removal of cyanide and heavy metals, in liquid effluents from the gold benefit, by adsorption with activated carbon and hydrogen peroxide. The residues were first treated with carbon to determine the adsorption efficiency with 20, 40, 60 g of carbon / L of solution at times of 4, 8, 12 hours. Then hydrogen peroxide (1.0, 1.5, 2.0 liters of peroxide / Kg CN in solution, was added over 4 hours). The response variables were concentrations of cyanide, lead, zinc, iron. The

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Miao, Zhao, Tong Jiang Peng, Yong Guang Xi, and Wei Yang. "Preparation of Expanding Vermiculite by Chemical and Microwave Methods." Advanced Materials Research 96 (January 2010): 155–60. http://dx.doi.org/10.4028/www.scientific.net/amr.96.155.

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Based on the characters of expanding and layer adsorbing of vermiculite，industrial vermiculite samples from Weili Mine of Xinjiang Province were expanded by both chemical and microwave chemical methods. The influences to the exfoliation ratio of different parameters such as concentration of hydrogen peroxide, power of the microwave, heating time, ratio of solid-liquid, immersion time were discussed. And the expanded mechanism of vermiculite was also analyzed. The results indicate that the expanded times increase with the increasing of concentration of hydrogen peroxide, and the best expanding

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Akhtar, Saeed, Mamoona Tanveer, Amir Ismail, Tariq Ismail, and Majid Hussain. "Safety Evaluation of Oil Samples Collected from Different Food Points of Multan City of Pakistan." International Journal of Food and Allied Sciences 3, no. 2 (2018): 43. http://dx.doi.org/10.21620/ijfaas.2017243-48.

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Cooking oil has become a part and parcel of modern food system and therefore its safety is of prime significance for health agencies around the globe to ensure good health among the community. Current study was designed to investigate the physicochemical properties including free fatty acids, peroxide value and conjugated dienes; minerals (nickel &amp; cobalt) and heavy metals (lead and cadmium) in oil samples collected from different areas of Multan city of Pakistan. The findings of this study revealed that free fatty acid percentages, conjugated dienes, cobalt and nickel concentrations w

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Ouyang, Xinping, Xiangzhen Huang, Tao Ruan, and Xueqing Qiu. "Microwave-assisted oxidative digestion of lignin with hydrogen peroxide for TOC and color removal." Water Science and Technology 71, no. 3 (2014): 390–96. http://dx.doi.org/10.2166/wst.2014.535.

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Dilute lignin solution was successfully digested into colorless and clarified liquor under microwave-assisted oxidative digestion with hydrogen peroxide. High dosage of hydrogen peroxide is needed to effectively digest lignin, but excessive hydrogen peroxide may lead to recondensation of formed fragments in digested lignin. Microwave irradiation greatly facilitates the oxidative digestion of lignin. Compared with conventional heating technique, microwave-assisted digestion achieves the same or higher digestion rate within a shorter time and/or at lower temperature. After digestion, total organ

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Schäfer, Konrad, Korbinian Köhler, Franziska Baumer, Rainer Pöttgen, and Tom Nilges. "Synthesis and structure determinantion of the first lead arsenide phosphide Pb2AsxP14–x (x ~ 3.7)." Zeitschrift für Naturforschung B 71, no. 5 (2016): 603–9. http://dx.doi.org/10.1515/znb-2016-0048.

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AbstractPb2AsxP14–x was synthesized by reacting the pnicogens in a lead melt in sealed silica ampoules. A mixture of hydrogen peroxide and glacial acetic acid removed lead from the final product. Pb2AsxP14–x represents the first lead arsenide phosphide adopting a new structure type. Systematic substitution of phosphorus by arsenic leads to the formation of Pb2AsxP14–x with x ~ 3.7, a compound with a two-dimensional arrangement of polypnictide layers, coordinated by Pb2+ cations. Pb2AsxP14–x is structurally related to PbP7 where a three-dimensional polyphosphide network is realized instead. The

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Ivanishchev, Viktor V. "Indicators of the antioxidant system and oxidative stress of triticale shoots under chloride salinity." Butlerov Communications 63, no. 9 (2020): 51–58. http://dx.doi.org/10.37952/roi-jbc-01/20-63-9-51.

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Alterations in the activity of antioxidant enzymes (catalase, ascorbate peroxidase, guaiacol peroxidase, glutathione reductase), the content of low molecular weight antioxidants (ascorbic acid, glutathione, and proline), as well as indicators of oxidative stress (hydrogen peroxide, superoxide radical, lipid peroxidation –LPO) in the shoots of triticale (Triticosecale) under short-term (0-96 h) sodium chloride stress (120 mM) were studied with statistical methods: principal component analysis (PCA) and cluster analysis. The application of the PCA method did not always lead to definite results t

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Patra, R. C., D. Swarup, and S. K. Dwivedi. "Antioxidant Defense and Lipid Peroxide Level in Liver and Kidneys of Lead Exposed Rats." Asian-Australasian Journal of Animal Sciences 13, no. 10 (2000): 1433–39. http://dx.doi.org/10.5713/ajas.2000.1433.

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Ko, Taegyung, and Deok-Ki Hwang. "Preparation of nanocrystalline lead zirconate powder by homogeneous precipitation using hydrogen peroxide and urea." Materials Letters 57, no. 16-17 (2003): 2472–79. http://dx.doi.org/10.1016/s0167-577x(02)01296-x.

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NISHIKAWA, Yoshinori, Keisuke TAGUCHI, and Yoshio TSUJINO. "Ion chromatographic determination of sulfur oxides in the atmosphere by lead peroxide candle method." Journal of Environmental Conservation Engineering 15, no. 7 (1986): 548–51. http://dx.doi.org/10.5956/jriet.15.548.

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Brent, G. F., and M. D. Harding. "Surfactant coatings for the stabilization of barium peroxide and lead dioxide in pyrotechnic compositions." Propellants, Explosives, Pyrotechnics 20, no. 6 (1995): 300–303. http://dx.doi.org/10.1002/prep.19950200604.

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Adebayo, A. O., and E. F. Olasehinde. "Leaching kinetics of lead from galena with acidified hydrogen peroxide and sodium chloride solution." Mineral Processing and Extractive Metallurgy 124, no. 3 (2015): 137–42. http://dx.doi.org/10.1179/1743285515y.0000000001.

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Mandakini S. Kshirsagar, Arun J. Patil, and Jyotsna A. Patil. "Elevated Blood Lead Results in oxidative stress and Alters the Antioxidants of Silver Jewellery labors." International Journal of Research in Pharmaceutical Sciences 11, no. 4 (2020): 7254–58. http://dx.doi.org/10.26452/ijrps.v11i4.3858.

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This study is designed to find out the present status of PbB level and its adverse effect on oxidative stress and antioxidant of Silver Jewellery Workers (SJW). Forty-two SJW of having an age range of 20-45 years were included for this study and compared with 50 healthy male subjects of the same age-matched. All biochemical investigations were determined by using standard methods. In this study, we found significantly increased PbB level (325%), serum lipid peroxide (191%) and significantly decreased antioxidant enzymes like superoxide dismutase (-37.83%), Catalase (-27.64%), Ceruloplasmin (-1

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Reddy, Amala, and Ganesh Venkatayappa. "FREE RADICAL QUENCHING EFFICACY OF VARIOUS EXTRACTS OF C.PICTUS TO COMBAT OXIDATIVE DAMAGE/STRESS: AN IN VITRO STUDY." Asian Journal of Pharmaceutical and Clinical Research 10, no. 2 (2017): 178. http://dx.doi.org/10.22159/ajpcr.2017.v10i2.15011.

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Objectives: The objectives of this research article are to elucidate the antioxidant activity of the sequentially extracted fractions using solvents with a varying range of polarity from the leaves of Costus pictus (Zingiberaceae). The antioxidant efficacy to combat the oxidative stress was evaluated based on their superoxide, hydrogen peroxide, and nitric oxide (NO) scavenging activity of the leaf extract.Methods: Extraction was performed by sequential extraction methods with low to high polar solvents. Using hexane as a low polar, dichloromethane as medium polar, and ethyl acetate and methan

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Standau, Tobias, Svenja Murillo Castellón, Agathe Delavoie, Christian Bonten, and Volker Altstädt. "Effects of chemical modifications on the rheological and the expansion behavior of polylactide (PLA) in foam extrusion." e-Polymers 19, no. 1 (2019): 297–304. http://dx.doi.org/10.1515/epoly-2019-0030.

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AbstractIt is well known that polylactide (PLA) is difficult to foam due to its low melt strength. Thus, many ways were described in the literature to enhance the foamability. However, the melt strength was actually determined only in a limited number of publications. In this study, the addition of chemical modifiers was used to change the rheological behavior of PLA and thereby improve its foamability in foam extrusion process. For the first time the use of dicumyl peroxide modified PLA in foam extrusion is described. Both modifications lead to a distinct increase in melt strength. Here, the

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Zhang, Shiyu, Matthew J. Nava, Gary K. Chow, et al. "On the incompatibility of lithium–O2 battery technology with CO2." Chemical Science 8, no. 9 (2017): 6117–22. http://dx.doi.org/10.1039/c7sc01230f.

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The peroxide dianion reacts with CO<sub>2</sub> in polar aprotic organic media to afford the hydroperoxycarbonate and carbonate radical anions. These highly reactive species, if formed in lithium–O<sub>2</sub> cells, can lead to cell degradation via oxidation of the electrolyte and electrode.

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Ponnusamy, Guhankumar, Lijo Francis, Kavithaa Loganathan, Oluwaseun O. Ogunbiyi, Saad Jasim, and Jayaprakash Saththasivam. "Removal of cyanotoxins in drinking water using ozone and ozone-hydrogen peroxide (peroxone)." Journal of Water Supply: Research and Technology-Aqua 68, no. 8 (2019): 655–65. http://dx.doi.org/10.2166/aqua.2019.028.

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Abstract Presence of cyanotoxins in drinking water poses a great risk to public health. Elevated levels of cyanotoxins in drinking water can lead to acute gastroenteritis, liver diseases, and neurotoxicity. In this study, drinking water samples were collected across the eastern part of Qatar and screened using a rapid assay to detect the presence of microcystins and nodularins. The results showed that the toxin concentrations in all the water samples were below the WHO prescribed limit of 1 μg/L. Considering a worst-case scenario, toxin removal efficiencies were evaluated using ozone and ozone

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Youker, Amanda J., Sergey D. Chemerisov, Michael Kalensky, Peter Tkac, Delbert L. Bowers, and George F. Vandegrift. "A Solution-Based Approach for Mo-99 Production: Considerations for Nitrate versus Sulfate Media." Science and Technology of Nuclear Installations 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/402570.

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Molybdenum-99 is the parent of Technetium-99m, which is used in nearly 80% of all nuclear medicine procedures. The medical community has been plagued by Mo-99 shortages due to aging reactors, such as the NRU (National Research Universal) reactor in Canada. There are currently no US producers of Mo-99, and NRU is scheduled for shutdown in 2016, which means that another Mo-99 shortage is imminent unless a potential domestic Mo-99 producer fills the void. Argonne National Laboratory is assisting two potential domestic suppliers of Mo-99 by examining the effects of a uranyl nitrate versus a uranyl

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Perez, E. G. A., M. Nichi, F. A. Oliveira Neto, et al. "34 OVINE SPERM IS HIGHLY SUSCEPTIBLE TO ATTACK BY HYDROGEN PEROXIDE." Reproduction, Fertility and Development 22, no. 1 (2010): 175. http://dx.doi.org/10.1071/rdv22n1ab34.

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Ram sperm membrane displays a particular lipid composition, especially regarding the high quantity of polyunsaturated cholesterol. This trait improves membrane fluidity; however, the spermatozoa become more susceptible to the attack of reactive oxygen species (ROS), which may lead to structural and functional damage, impairment or even impeded fecundity. The aim of the present experiment was to study the resistance of ovine spermatozoa to different ROS. Sperm samples from 4 rams were collected using an artificial vagina. Sperm samples were then incubated (1 h, 37°C) with four ROS inducer mecha

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Janmohammadi, M., M. R. Bihamta, and F. Ghasemzadeh. "Influence of Rhizobacteria Inoculation and Lead Stress on the Physiological and Biochemical Attributes of Wheat Genotypes." Cercetari agronomice in Moldova 46, no. 1 (2013): 49–67. http://dx.doi.org/10.2478/v10298-012-0074-x.

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Abstract Contamination of soils by lead (Pb) is of widespread occurrence as result of human, agricultural and industrial activities. A pot study was carried out to evaluate physio-biochemical responses (chlorophyll content, soluble protein, proline content and activities of enzymatic antioxidants) of 10 bread wheat genotypes to inoculation of plant growth promoting rhizobacteria (combination of Azospirillum brasilense and Azotobacter chroococcum) under Pb stress (0 and 65 mg kg-1). Result revealed that lead stress averagely decreased grain yield of wheat cultivars by 41.4 %. Lead stress increa

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Güven, Emine, Lindsay A. Parnell, Erin D. Jackson, et al. "Hydrogen peroxide induced loss of heterozygosity correlates with replicative lifespan and mitotic asymmetry inSaccharomyces cerevisiae." PeerJ 4 (November 3, 2016): e2671. http://dx.doi.org/10.7717/peerj.2671.

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Cellular aging inSaccharomyces cerevisiaecan lead to genomic instability and impaired mitotic asymmetry. To investigate the role of oxidative stress in cellular aging, we examined the effect of exogenous hydrogen peroxide on genomic instability and mitotic asymmetry in a collection of yeast strains with diverse backgrounds. We treated yeast cells with hydrogen peroxide and monitored the changes of viability and the frequencies of loss of heterozygosity (LOH) in response to hydrogen peroxide doses. The mid-transition points of viability and LOH were quantified using sigmoid mathematical functio

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Syafrudin, Intan Permata Sari, Asterina Asterina, and Russilawati Russilawati. "Kandungan Bilangan Peroksida Minyak Goreng Pedagang di Jalan Perintis Kemerdekaan Kota Padang." Jurnal Ilmu Kesehatan Indonesia 1, no. 3 (2021): 364–70. http://dx.doi.org/10.25077/jikesi.v1i3.86.

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Background. Indonesian usually using repeatedly cooking oil for deep frying process. The repeated use of cooking oil can be found among street vendors. Consumption of repeatedly cooking oil could lead to hepatic disorder, cardiovasular disorder and even cancer. Objective. The research aims to describe and analyze peroxide value in cooking oil used by street vendors in Perintis Kemerdekaan street in Padang City. Methods. This is a descriptive research. The reseacrh objects were taken by purposive sample method and 23 samples cooking oil used by traders. This research was conducted at Clinical L

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Nunes, Karolini Zuqui, Dieli Oliveira Nunes, Edna Aparecida Silveira, et al. "Chronic Lead Exposure Decreases the Vascular Reactivity of Rat Aortas: The Role of Hydrogen Peroxide." PLOS ONE 10, no. 3 (2015): e0120965. http://dx.doi.org/10.1371/journal.pone.0120965.

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Ni, Zhenmin, Stephen Hou, Cyril H. Barton, and Nosratola D. Vaziri. "Lead exposure raises superoxide and hydrogen peroxide in human endothelial and vascular smooth muscle cells." Kidney International 66, no. 6 (2004): 2329–36. http://dx.doi.org/10.1111/j.1523-1755.2004.66032.x.

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PATRA, R. C., and D. SWARUP. "Effect of lead on erythrocytic antioxidant defence, lipid peroxide level and thiol groups in calves." Research in Veterinary Science 68, no. 1 (2000): 71–74. http://dx.doi.org/10.1053/rvsc.1999.0340.

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Camargo, Emerson R., and Masato Kakihana. "ChemInform Abstract: Peroxide-Based Route Free from Halides for the Synthesis of Lead Titanate Powder." ChemInform 32, no. 29 (2010): no. http://dx.doi.org/10.1002/chin.200129025.

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