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Artigos de revistas sobre o tema "Oxidising agents"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 7 de setembro de 2023

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1

Reyes Calle, Juliana, Jairo Antonio Cubillos Lobo, Consuelo Montes de Correa e Aída Luz Villa Holguín de P. "Oxidising agent and catalyst chirality effect on epoxidation of R-(+)- Limonene using Jacobsen-type catalysts". Ingeniería e Investigación 28, n.º 2 (1 de maio de 2008): 37–44. http://dx.doi.org/10.15446/ing.investig.v28n2.14890.

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The oxidising agent effect on R-(+)-Limonene epoxide diastereoselectivity using chiral and achiral Jacobsen’s type catalysts is presented. The type of oxidising agent strongly influences diastereoselectivity. Moderate diastereomeric excesses were achieved in the presence of oxidising agents prepared in situ but in the absence of catalyst (23% for DMD and 29% for O2/pivalaldehyde). Similar diastereomeric excesses were obtained with both chiral and achiral catalyst when the oxidising agents were prepared in situ; 56% and 50% excesses were obtained when using DMD for the chiral and achiral catalyst (respectively) and 38% using O2/pivalaldehyde for both catalysts. Diastereomeric excesses were not observed in the absence of catalyst when using commercial oxidising agents; the chiral catalyst presented larger diastereomeric excesses than its achiral counterpart: 65% and 38% excess using NaOCl for the chiral and achiral catalyst, respectively, and 79% and 39% using m-CPBA for the chiral and achiral catalyst, respectively. This suggests that at least one oxidant species, different from the conventionally accepted (MnV(oxo)), might be involved in this catalytic process. A modification of the traditional catalytic cycle is proposed considering the type of oxidising agent. The catalyst’s chiral centre appears to govern asymmetric induction when commercial oxidising agents are used, whereas the R-(+)-Limonene chiral centre appears to govern asymmetric induction in the presence of in situ-prepared oxidising agents. On the other hand, the chemical stability of Jacobsen’s catalyst improved when in situ produced DMD was used as oxidising agent.

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2

Jaglic, Z., D. Červinková, H. Vlková, E. Michu, G. Kunová e V. Babák. "Bacterial biofilms resist oxidising agents due to the presence of organic matter". Czech Journal of Food Sciences 30, No. 2 (9 de março de 2012): 178–87. http://dx.doi.org/10.17221/214/2011-cjfs.

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This study evaluated the susceptibility of planktonic and biofilm cells of Staphylococcus spp. (n = 87), Klebsiella spp. (n = 30), and Escherichia coli (n = 74) isolates originating from food contact surfaces of milk and meat processing plants to benzalkonium chloride (BAC), sodium hypochlorite (NaClO), chloramine B (CAB), and peracetic acid (PAA). Bacterial growth and reduction of viable cells in the presence of disinfectants were determined in tryptone soya broth (TSB) and water, respectively. Biofilm positive isolates (n = 73) were tested for the presence of selected qac genes. Unlike BAC, chlorine‑based disinfectants and PAA were poorly efficient in TSB, especially in the case of biofilms. However, when tested in water, the efficacy of NaClO, CAB and PAA substantially increased, which was particularly evident in biofilms. In water, staphylococcal biofilms were even more susceptible to CAB than planktonic cells. A part (23.3%) of the biofilm positive staphylococci carried the qac genes but did not express an increased resistance to BAC. This study showed that bacterial biofilms protected with organic matter could be one of the main reasons for disinfection failure.  

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3

Cassagne, Thierry, Henri-Jean Cristau, Gérard Delmas, Michel Desgranges, Claude Lion, Gilbert Magnaud, Έliane Torreilles e David Virieux. "Comparative Evaluation of Oxidising and Nucleophilic Properties of Some α-Nucleophiles". Journal of Chemical Research 2002, n.º 7 (julho de 2002): 336–38. http://dx.doi.org/10.3184/030823402103172194.

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Six α-nucleophiles were evaluated at pH = 8 in an aqueous methanolic solution for their oxidising power towards tetrahydrothiophene, and the nucleophilic properties towards paraoxon. MMPP and m-CPBA are the most versatile reagents and can act as nucleophiles as well as oxidising agents.

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4

Dietmann, Karen Maria, Tobias Linke, Miguel del Nogal Sánchez, José Luis Pérez Pavón e Vicente Rives. "Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water". Minerals 10, n.º 5 (20 de maio de 2020): 462. http://dx.doi.org/10.3390/min10050462.

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The contamination by chlorinated organic solvents is a worldwide problem as they can deeply penetrate aquifers, accumulating in the sub-surface as lenses of highly hazardous pollutants. In recent years, so called in situ oxidation processes have been developed to remediate chlorinated organic solvents from groundwater and soil by injecting solutions of oxidising agents such as permanganate or peroxydisulphate. We here present modified layered double hydroxides (LDHs) with intercalated oxidising agents that might serve as new reactants for these remediation strategies. LDHs might serve as support and stabiliser materials for selected oxidising agents during injection, as the uncontrolled reaction and consumption might be inhibited, and guarantee that the selected oxidants persist in the subsurface after injection. In this study, LDHs with hydrotalcite- and hydrocalumite-like structures intercalated with permanganate and peroxydisulphate anions were synthesised and their efficiency was tested in batch experiments using trichloroethene or 1,1,2-trichloroethane as the target contaminants. All samples were characterised using powder X-ray diffraction, thermal analysis coupled with mass spectrometry to directly analyse evolving gases, and Fourier-transform infrared spectroscopy. Additionally, particle size distribution measurements were carried out on the synthesised materials. Results of the batch experiments confirmed the hypothesis that oxidising agents keep their properties after intercalation. Permanganate intercalated LDHs proved to be most efficient at degrading trichloroethene while peroxydisulphate intercalated Ca,Al-LDHs were the most promising studied reactants degrading 1,1,2-trichloroethane. The detection of dichloroethene as well as the transformation of the studied reactants into new LDH phases confirmed the successful degradation of the target contaminant by oxidation processes generated from the intercalated oxidising agent.

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5

Pečivová, Pavlína, Vladimír Pavlínek, Jan Hrabě e Stanislav Kráčmar. "The influence of reducing and oxidising agents on the rheology of wheat flour dough". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 56, n.º 5 (2008): 163–70. http://dx.doi.org/10.11118/actaun200856050163.

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The effects of a reducing agent (L-cysteine hydrochloride monohydrate), oxidising agents (inactivated dry yeast, L-tyrosine) and other two amino acids (L-threonine and L-tryptophan) on the rheological characteristics of wheat flour dough and its quality were studied. The addition of oxidising agents increases the values such as tenacity and decreases extensibility which were measured on the alveograph. From the consistograph values, weakening of the dough also decreases. While reducing agents increase the extensibility and weakening of the dough, they decrease its deformation energy. The addition of L-tryptophan caused a higher increase in tenacity of the dough but on the other hand a larger decrease in extensibility and deformation energy. L-tryptophan caused better stability of the dough. L-treonine was found to be an oxidising agent. The dough with L-threonine weakened rapidly and therefore fast preparation of the dough is necessary. It means that the time of mixing and dough proofing must be reduced.

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6

Moore, Harold. "The Action of Some Oxidising: Agents on Cellulose." Journal of the Society of Dyers and Colourists 31, n.º 9 (22 de outubro de 2008): 180–83. http://dx.doi.org/10.1111/j.1478-4408.1915.tb00893.x.

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7

Schorpp, Marcel, Stephan Rein, Stefan Weber, Harald Scherer e Ingo Krossing. "Guilty and charged: a stable solution of the hexamethylbenzene radical cation as a ligand forming oxidising agent". Chemical Communications 54, n.º 72 (2018): 10036–39. http://dx.doi.org/10.1039/c8cc04690e.

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8

Caldeo, Veronica, John A. Hannon, Dara-Kate Hickey, Dave Waldron, Martin G. Wilkinson, Thomas P. Beresford e Paul L. H. McSweeney. "Control of oxidation-reduction potential during Cheddar cheese ripening and its effect on the production of volatile flavour compounds". Journal of Dairy Research 83, n.º 4 (3 de outubro de 2016): 479–86. http://dx.doi.org/10.1017/s002202991600056x.

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In cheese, a negative oxidation-reduction (redox) potential is required for the stability of aroma, especially that associated with volatile sulphur compounds. To control the redox potential during ripening, redox agents were added to the salted curd of Cheddar cheese before pressing. The control cheese contained only salt, while different oxidising or reducing agents were added with the NaCl to the experimental cheeses. KIO3 (at 0·05, 0·1 and 1%, w/w) was used as the oxidising agent while cysteine (at 2%, w/w) and Na2S2O4 (at 0·05 and 0·1%, w/w) were used as reducing agents. During ripening the redox potential of the cheeses made with the reducing agents did not differ significantly from the control cheese (Eh ≈ −120 mV) while the cheeses made with 0·1 and 0·05% KIO3 had a significantly higher and positive redox potential in the first month of ripening. Cheese made with 1% KIO3 had positive values of redox potential throughout ripening but no starter lactic acid bacteria survived in this cheese; however, numbers of starter organisms in all other cheeses were similar. Principal component analysis (PCA) of the volatile compounds clearly separated the cheeses made with the reducing agents from cheeses made with the oxidising agents at 2 month of ripening. Cheeses with reducing agents were characterized by the presence of sulphur compounds whereas cheeses made with KIO3 were characterized mainly by aldehydes. At 6 month of ripening, separation by PCA was less evident. These findings support the hypothesis that redox potential could be controlled during ripening and that this parameter has an influence on the development of cheese flavour.

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9

Carniato, F., C. Bisio, C. Evangelisti, R. Psaro, V. Dal Santo, D. Costenaro, L. Marchese e M. Guidotti. "Iron-montmorillonite clays as active sorbents for the decontamination of hazardous chemical warfare agents". Dalton Transactions 47, n.º 9 (2018): 2939–48. http://dx.doi.org/10.1039/c7dt03859c.

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Montmorillonite clay was modified to introduce iron species and acid sites in the interlayer space, aiming to obtain a catalyst with oxidising and acid properties for the degradation of chemical warfare agents.

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10

Viseux, Eddy, Rhys Ellis, Kee-Han Lee, Matthew Ainsworth e Alexander Kerr. "Development of Manganese(VI) Oxidising Agents Soluble in Organic Solvents". Synlett 23, n.º 09 (14 de maio de 2012): 1371–73. http://dx.doi.org/10.1055/s-0031-1290691.

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11

Vincent, G., C. Franz e M. M. Solórzano Kraemer. "Management of the Senckenberg amber collection and research developments". Geological Curator 9, n.º 7 (julho de 2012): 371–80. http://dx.doi.org/10.55468/gc71.

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Amber and copal are fascinating materials due to their ability to preserve fossils in incredible detail, but they are also very fragile materials that quickly deteriorate when stored in unsuitable conditions. The copal surface becomes cracked after some years and amber becomes darker and fragile over time. Few studies have dealt with the problem of amber storage, but they highlighted the bad effects of environmental conditions (temperature, relative humidity, light and oxidising agents). After the acquisition of important collections of amber and copal, the Senckenberg museum developed an original storage system for its amber collection. New air-conditioned stores protect the material from temperature, relative humidity and/or light intensity variations, whilst embedding in artificial resin is used to protect the samples from the atmosphere oxidising agents. The Senckenberg museum has thus a very secure amber storage system.

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12

Zhang, Qi, Shouxin Liu, Xia Tian, Yidong Liu, Shiming Fan, Baibiao Huang e Andrew Whiting. "Cu@CuCl-visible light co-catalysed chlorination of C(sp³)–H bonds with MCl_n solution and photocatalytic serial reactor-based synthesis of benzyl chloride". Green Chemistry 24, n.º 1 (2022): 384–93. http://dx.doi.org/10.1039/d1gc03092b.

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A highly selective and sustainable chlorination of aliphatic C–Hs with inorganic chloride MCln as a chlorine source in a weak acidic water solution without strong oxidising agents under the co-catalysis of visible light is reported.

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13

Sin, Jonathan Hong-Man, Stephen Hamlet, Laurence J. Walsh, Robert M. Love e Roy George. "Oxidising agents and its effect on human dentine fluorescence diagnostic measurements". Photodiagnosis and Photodynamic Therapy 31 (setembro de 2020): 101950. http://dx.doi.org/10.1016/j.pdpdt.2020.101950.

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14

Rajasekharan-Nair, Rajeev, Lisa Darby, John Reglinski, Mark D. Spicer e Alan R. Kennedy. "Nitric oxide species as oxidising agents and adducts for soft scorpionates". Inorganic Chemistry Communications 41 (março de 2014): 11–13. http://dx.doi.org/10.1016/j.inoche.2013.12.007.

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15

Cassagne, Thierry, Henri-Jean Cristau, Gérard Delmas, Michel Desgranges, Claude Lion, Gilbert Magnaud, Éliane Torreilles e David Virieux. "Reactions of N,N-diisopropyl-2-aminoethylp-fluorobenzene thiosulfonate with oxidising agents". Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry 4, n.º 4 (abril de 2001): 309–14. http://dx.doi.org/10.1016/s1387-1609(01)01231-2.

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16

Chimonyo, Wonder, Jenny Wiese, Kirsten Corin e Cyril O'Connor. "The use of oxidising agents for control of electrochemical potential in flotation". Minerals Engineering 109 (agosto de 2017): 135–43. http://dx.doi.org/10.1016/j.mineng.2017.03.011.

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17

Thibault, Jean-François, e Frank M. Rombouts. "Effects of some oxidising agents, especially ammonium peroxysulfate, on sugar-beet pectins". Carbohydrate Research 154, n.º 1 (outubro de 1986): 205–15. http://dx.doi.org/10.1016/s0008-6215(00)90033-8.

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18

Pečivová, Pavlína, Iva Burešová e Jan Hrabě. "Changes of protein fractions in wheat flour caused by additives". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 58, n.º 1 (2010): 123–30. http://dx.doi.org/10.11118/actaun201058010123.

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The influence of different combinations of reducing and oxidising agents (L-cysteine hydrochloride monohydrate + L-ascorbic acid, inactivated dry yeast + L-ascorbic acid, L-threonine + L-ascorbic acid, L-tryptophan + L-ascorbic acid) on the change in the proportion of glutenins, gliadins, albumins, globulins in wheat flour was investigated.Different concentrations of amino acid combinations were added to wheat flour. By means of Size Exclusion High performance liquid chromatography (SE-HPLC), the changes in protein fractions caused by individual concentrations of amino acid combinations were evaluated against the control sample (pure wheat flour).It was detected that the mixture of flour + L-ascorbic acid + L-cysteine hydrochloride monohydrate had the stronger reducing effect than the mixture of flour + L-ascorbic acid + inactivated dry yeast. On the other hand, the mixture of flour + L-ascorbic acid + L-tryptophan had the stronger oxidising effect than the mixture of flour + L-ascorbic acid + L-threonine.

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19

Bayat, O., H. Vapur, F. Akyol e C. Poole. "Effects of oxidising agents on dissolution of Gumuskoy silver ore in cyanide solution". Minerals Engineering 16, n.º 4 (abril de 2003): 395–98. http://dx.doi.org/10.1016/s0892-6875(03)00050-5.

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20

Subramanian, Priya, Noel B. Clark, Leone Spiccia, Douglas R. MacFarlane, Bjorn Winther-Jensen e Craig Forsyth. "Vapour phase polymerisation of pyrrole induced by iron(III) alkylbenzenesulfonate salt oxidising agents". Synthetic Metals 158, n.º 17-18 (outubro de 2008): 704–11. http://dx.doi.org/10.1016/j.synthmet.2008.04.021.

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21

Pečivová, Pavlína, Vladimír Pavlínek, Jan Hrabě, Pavel Valášek e Lubomír Bouda. "Impact of reducing and oxidising agents on the wheat flour dough dynamic rheological properties". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, n.º 1 (2011): 191–98. http://dx.doi.org/10.11118/actaun201159010191.

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Dynamic measurements with an oscillatory rheometer were made to study the rheological properties of wheat flour doughs and to examine how they are related to the composition of dough (the addition of oxidising and reducing agents).It was found that L-cysteine hydrochloride monohydrate (0.6 × 10−2 − 4.0 × 10−2 wt.%), L-cysteine p. a. (0.6 × 10−2 − 1.4 × 10−2 wt.%) and glutathione-inactivated dry yeast (1.8 × 10−2 − 14.0 × 10−2 wt.%) show softening effects. An interesting phenomenon was observed from the concentration of 2.4 × 10−2 wt.% of L-cysteine p. a., where proces of weakening was decelerated. L-cysteine start making cystine by reaction of two cysteine molecules and proces of weakening was decelerated. L-threonine, L-tryptophan within the concentration range of 2.0 × 10−2 − 14.0 × 10−2 wt.% and L-tyrosine, especially at concentrations 10.0 × 10−2 − 14.0 × 10−2 wt.%, have strengthening effects. L-cysteine hydrochloride monohydrate exhibited the strongest softening effect while L-tryptophan had the strongest stiffening effect on the gluten network.

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22

Martin, D. J. H., S. P. Denyer, G. McDonnell e J. Y. Maillard. "Resistance and cross-resistance to oxidising agents of bacterial isolates from endoscope washer disinfectors". Journal of Hospital Infection 69, n.º 4 (agosto de 2008): 377–83. http://dx.doi.org/10.1016/j.jhin.2008.04.010.

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23

Ayare, Sudesh D., e Parag R. Gogate. "Sonophotocatalytic oxidation based treatment of phthalocyanine pigment containing industrial wastewater intensified using oxidising agents". Separation and Purification Technology 233 (fevereiro de 2020): 115979. http://dx.doi.org/10.1016/j.seppur.2019.115979.

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24

Basahel, Sulaiman N., Shaeel A. Al Thabaiti, Abdullah Y. Obaid, Mohamed Mokhtar e Mohamed Abdel Salam. "Chemical modification of multi-walled carbon nanotubes using different oxidising agents: optimisation and characterisation". International Journal of Nanoparticles 2, n.º 1/2/3/4/5/6 (2009): 200. http://dx.doi.org/10.1504/ijnp.2009.028753.

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25

McKillop, Alexander, e William R. Sanderson. "Sodium perborate and sodium percarbonate: Cheap, safe and versatile oxidising agents for organic synthesis". Tetrahedron 51, n.º 22 (maio de 1995): 6145–66. http://dx.doi.org/10.1016/0040-4020(95)00304-q.

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26

Jyothi, Alummoottil N., Korappatti Sasikiran, Moothandasseri S. Sajeev, R. Revamma e Subramoney N. Moorthy. "Gelatinisation Properties of Cassava Starch in the Presence of Salts, Acids and Oxidising Agents". Starch - Stärke 57, n.º 11 (novembro de 2005): 547–55. http://dx.doi.org/10.1002/star.200500412.

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27

Pietrzak, Robert, Helena Wachowska e Piotr Nowicki. "The effect of flame coal oxidation on the solid and soluble products of its extraction". Open Chemistry 3, n.º 4 (1 de dezembro de 2005): 852–65. http://dx.doi.org/10.2478/bf02475208.

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AbstractSolid and soluble products of THF and CH2Cl2 extraction of flame coal oxidised by four different oxidising agents (peroxyacetic acid (PAA), 5% HNO3, O2/Na2CO3, air/125 °C) were studied by elemental analysis and FTIR. The extraction yield with THF was much higher than that with CH2Cl2 for all samples. The greatest changes in elemental composition were in the extracts from coal oxidised by nitric acid. The sulphur content was lowest in extracts from coal oxidised with 5% HNO3 and PAA. FTIR confirmed that coal treatment with nitric acid incorporates nitrogen into the coal structure.

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28

Swiatla-Wojcik, Dorota. "A Numerical Simulation of Radiation Chemistry for Controlling the Oxidising Environment in Water-Cooled Nuclear Power Reactors". Applied Sciences 12, n.º 3 (18 de janeiro de 2022): 947. http://dx.doi.org/10.3390/app12030947.

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Maintaining the integrity of materials of light-water nuclear power reactors requires the development of effective methods to control and minimise the corrosive environment associated with the radiolysis of a coolant. In this study, the behaviour of the oxidising environment is simulated using a hybrid method. The hybrid method has advantages in that the production of radiolytic species under exposure of the coolant to ionising radiation is simulated while providing material and charge balances. Steady-state concentrations of stable and transient oxidising agents are calculated as a function of radiation composition and dose rate by numerical integration of the system of kinetic equations describing radiation chemistry of neutral water, the alkaline solution, and the hydrogenated systems at 300 °C. The importance of the reactions and equilibria constituting the radiolysis scheme of the coolant is assessed. The influence of the presence of a base and the injected H2 on the yield of key reactions responsible for the formation of the main oxidants H2O2 and O2 are discussed. Simulation indicated the synergic effect of H2 gas and base added to the coolant on diminishment of the steady-state concentration of oxidants.

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Boguslavskaya, L. S., A. V. Kartashov e N. N. Chuvatkin. "Selective replacement of hydrogen at a saturated carbon atom under the action of oxidising agents". Russian Chemical Reviews 59, n.º 6 (30 de junho de 1990): 501–13. http://dx.doi.org/10.1070/rc1990v059n06abeh003539.

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30

Montesinos, Isabel, e Mercedes Gallego. "Speciation of common volatile halogenated disinfection by-products in tap water under different oxidising agents". Journal of Chromatography A 1310 (outubro de 2013): 113–20. http://dx.doi.org/10.1016/j.chroma.2013.08.036.

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Castillo, J. R., J. M. Mir, C. Mart�nez, J. Val e M. P. Colon. "Influence of oxidising agents in lead determination by hydride generation direct flame atomic absorption spectroscopy". Mikrochimica Acta 85, n.º 3-4 (maio de 1985): 253–63. http://dx.doi.org/10.1007/bf01198298.

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Lysien, Kinga, Sylwia Waśkiewicz, Agnieszka Stolarczyk, Anna Mielańczyk, Roman Zakusylo e Tomasz Jarosz. "Traditional vs. Energetic and Perchlorate vs. “Green”: A Comparative Study of the Choice of Binders and Oxidising Agents". Molecules 28, n.º 15 (31 de julho de 2023): 5787. http://dx.doi.org/10.3390/molecules28155787.

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The aim of this article is to compare rocket propellants containing a traditional binder (hydroxyl-terminated polybutadiene) and an energetic binder (glycidyl azide polymer), as well as a perchlorate oxidising agent and a “green” one, i.e., ammonium perchlorate and phase-stabilised ammonium nitrate. We have outlined the effects of individual substances on the sensitivity parameters and decomposition temperature of the produced solid propellants. The linear combustion velocity was determined using electrical methods. Heats of combustion for the propellant samples and the thermal decomposition features of the utilised binders were investigated via differential scanning calorimetry (DSC). Activation energy values for the energetic decomposition of the propellants were determined via the Kissinger method, based on DSC measurements at varied heating rates.

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Mehta, Akshita, Aashna Gupta, Kamal Kumar Bhardwaj e Reena Gupta. "A Purified Alkaline and Detergent-Tolerant Lipase from Aspergillus fumigatus with Potential Application in Removal of Mustard Oil Stains from Cotton Fabric". Tenside Surfactants Detergents 58, n.º 6 (1 de novembro de 2021): 442–51. http://dx.doi.org/10.1515/tsd-2021-2378.

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Abstract In the present study, the lipase from Aspergillus fumigatus was purified which was found to be stable to commercial detergents and oxidising agents. A purification fold of 6.96 and yield of 11.03% were achieved when the enzyme was purified using Octyl Sepharose column chromatography. In presence of various oxidizing agents, the highest activity of lipase was 15.56 U/mg with hydrogen peroxide. Among various surfactants used, the maximum activity exhibited by lipase was with Tween 80. While studying the effect of various detergents, the highest activity of 9.3 U/mg was achieved with "Vanish" detergent. Wash performance was studied with various detergents out of which "Vanish" showed highest oil removal of 79%. Lipase from Aspergillus fumigatus possessed better stability with various surfactants and oxidizing agents. The results of this study have shown that the lipase from Aspergillus fumigatus along with detergent "Vanish" (0.7%) under optimized conditions (5 μg/ml lipase, 40°C wash temperature and 40 min wash duration) improved oil removal from cotton fabric stained with mustard oil by 84%.

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Cooley, N., R. H. Elder e A. C. Povey. "The Effect ofMsh2Knockdown on Toxicity Induced bytert-Butyl-hydroperoxide, Potassium Bromate, and Hydrogen Peroxide in Base Excision Repair Proficient and Deficient Cells". BioMed Research International 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/152909.

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The DNA mismatch repair (MMR) and base excision repair (BER) systems are important determinants of cellular toxicity following exposure to agents that cause oxidative DNA damage. To examine the interactions between these different repair systems, we examined whether toxicity, induced byt-BOOH and KBrO3, differs in BER proficient (Mpg+/+,Nth1+/+) and deficient (Mpg−/−,Nth1−/−) mouse embryonic fibroblasts (MEFs) followingMsh2knockdown of between 79 and 88% using an shRNA expression vector.Msh2knockdown inNth1+/+cells had no effect ont-BOOH and KBrO3induced toxicity as assessed by an MTT assay; knockdown inNth1−/−cells resulted in increased resistance tot-BOOH and KBrO3, a result consistent with Nth1 removing oxidised pyrimidines.Msh2knockdown inMpg+/+cells had no effect ont-BOOH toxicity but increased resistance to KBrO3; inMpg−/−cells,Msh2knockdown increased cellular sensitivity to KBrO3but increased resistance to t-BOOH, suggesting a role forMpgin removing DNA damage induced by these agents. MSH2 dependent and independent pathways then determine cellular toxicity induced by oxidising agents. A complex interaction between MMR and BER repair systems, that is, exposure dependent, also exists to determine cellular toxicity.

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35

Malaun, Michael, Ralph Kowallick, Andrew M. McDonagh, Massimo Marcaccio, Rowena L. Paul, Inge Asselberghs, Koen Clays et al. "Donorâ€“acceptor complexes incorporating ferrocenes: spectroelectrochemical characterisation, quadratic hyperpolarisabilities and the effects of oxidising and reducing agents". Journal of the Chemical Society, Dalton Transactions, n.º 20 (1 de outubro de 2001): 3025–38. http://dx.doi.org/10.1039/b104791b.

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36

Saleem, Basima A. A., Wael A. Al-Qazzaz e Sahbaa Y. Majeed. "Determination of Indomethacin Derivative via Xylenol Orange Dye". Asian Journal of Water, Environment and Pollution 19, n.º 2 (18 de março de 2022): 17–23. http://dx.doi.org/10.3233/ajw220019.

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Indomethacin hydrazide is a very important compound in the medical field prepared recently to reduce the side effects of indomethacin. The role of the drug is as a non-steroidal anti-inflammatory. Therefore, the methods for estimating this important compound are very few. In this study, an easy, inexpensive and fast spectrophotometric method has been proposed for the determination of this compound in various samples. The method is based on two steps, the first step is the oxidising of indomethacin hydrazide with the oxidizing agent N-bromosuxinamide in an acidic medium, where a compound is formed, and gradually shortens the reddish-orange colour of the xylenol orange dye with the steady increase of indomethacin hydrazide in the second step. The orange xylenol dye is of great importance as it is used in removing a lot of pollution damage, especially contamination with metals, where these minerals are complexes with the xylenol dye and are separated and removed. Besides the important use of this dye in the removal of oxidation products of drugs, as in the case of the indomethacin derivative, after it had been converted to the oxidised formula with the aid of oxidising agents. This method obeyed Beer’s law at the concentration range from 2-28 μg/mL, Sandall’s value was 0.1547 μg-2 cm-1, while the molar absorptivity value was 5.77×104 L mol-1 cm-1. The method was successfully applied to determine the amount of indomethacin hydrazide in different samples.

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37

Thanyasirikul, Yupa, Chaveng Pakawatchai, Marcus L. Cole, Peter C. Junk, Brian W. Skelton e Allan H. White. "Reappraising the formation of Jaffé's base: studies of the treatment of imidazolidine-2-thione with mild oxidising agents". Org. Biomol. Chem. 1, n.º 18 (2003): 3217–22. http://dx.doi.org/10.1039/b306647a.

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38

Lambert, S. D., e K. E. McGrath. "Can stored sludge cake be deodorised by chemical or biological treatment?" Water Science and Technology 41, n.º 6 (1 de março de 2000): 133–39. http://dx.doi.org/10.2166/wst.2000.0102.

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The storage of sludge cake provides an opportunity for septicity to develop, withattendant odours. Moreover, the odour prevention, containment and minimisation procedures used successfully in the rest of the works may not be adaptable to sludge storage and subsequent transport and disposal. Odourscan be released throughout storage and, in addition, the subsequent movement of the cake can release high concentrations of odours which have accumulated. This paper focuses on the use of five types of chemical and biological treatment product to remediate odour in stored cake sludges: oxidising agents, bacteriological/enzymatic preparations, biological suppressants, nutrients, and odour neutralisers. Their action is described in terms of their effects on the microbial population of the sludge, the types of odours they are designed to eradicate, and how they are used in practice.

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39

Pandey, Saurabh, Bhavana Dubey e Abadhesh Kumar Niranjan. "Comprehending the Presence and Application of Antiradicals and Antioxidants within the Human Body". Journal of Drug Delivery and Therapeutics 12, n.º 4-S (25 de agosto de 2022): 236–38. http://dx.doi.org/10.22270/jddt.v12i4-s.5541.

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A substance that prevents other molecules from oxidising is known as an antioxidant1. A chemical process called oxidation can generate free radicals, which can set off a series of events that can harm cells. Ascorbic acid, an antioxidant, stops these cascades of events. Reactive-oxygen species (ROS) are produced in excess by plants and animals as a result of various abiotic stressors. ROS are extremely sensitive and toxic, damaging proteins, lipids, carbohydrates, and DNA as a result, which causes oxidative stress. This oxidative-stress damages tissues and contributes to a broad range of illnesses2. Antioxidants counteract the effects of ROS and aid in disease prevention by balancing their effects. Antioxidants can be naturally occurring or synthetic. Common cancer preventatives are ingested through diet because they are present in organic foods, veggies, and flavours. Additionally, several designed cancer preventative substances like BHT and BHA prevent oxidation. The search for non-toxic cancer prevention agents has gotten stronger in recent years, nonetheless, as it has been determined that these synthetic cancer prevention agents pose risks to people. Keywords: Parkinson's disease, Parkinson's cancer, ascorbic acid, and tocopherols.

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40

RADOMSKI, ANDRZEJ, e DARIA KAŹMIERCZAK. "Studies on the suitability of oxidizing agents for discolouring lime and poplar wood in the first stage of transparent wood forming process". Annals of WULS, Forestry and Wood Technology 108 (31 de outubro de 2019): 148–55. http://dx.doi.org/10.5604/01.3001.0013.7702.

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Studies on the suitability of oxidizing agents for discolouring lime and poplar wood in the first stage of transparent wood forming process. Series of lime and poplar wood samples were prepared and subjected to oxidising agent in order to decolourise wood in bulk. Sodium chlorite solution in the environment of diluted acetic acid and alkaline hydrogen peroxide solution were used as different treating agents, followed by intense rinsing in water and drying the samples. The effect of wood delignification conditions such as time of treatment and reagent used was investigated. Changes in mass and dimensions of the samples were measured, and thus density changes were calculated. Colour changes were measured with colorimeter in CIE Lab colour space. In the case of lime wood swelling of the samples was observed at the first stage, along with mass loss, leading to density decrease by 10 % after 20 h exposure. In the case of poplar wood, shrinking of the samples was observed, but due to severe mass loss, final density was similar to lime wood. Colour changes correlated mainly with lightness parameter of the samples. Significant colour differences were found even at the shortest time of treatment.

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41

Parker, A. R., C. P. Leonard, L. Hua, R. O. Francis, S. Dhara, A. Maitra e J. R. Eshleman. "A subgroup of microsatellite stable colorectal cancers has elevated mutation rates and different responses to alkylating and oxidising agents". British Journal of Cancer 90, n.º 8 (16 de março de 2004): 1666–71. http://dx.doi.org/10.1038/sj.bjc.6601740.

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42

Sampaio, C. H., C. O. Petter, R. M. Kautzmann e S. L. Klein. "Technological characterization of riacho dos machados gold ore for cyanide leaching and study of the utilization of oxidising agents". Minerals Engineering 10, n.º 5 (maio de 1997): 547–50. http://dx.doi.org/10.1016/s0892-6875(97)00032-0.

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43

Henne, Anicia, Dave Craw, Jessica Hamilton, Anat Paz, Gemma Kerr, David Paterson, Jeremiah Shuster e Gordon Southam. "Biogeochemical formation of metalliferous laminations in surficial environments". Mineralogical Magazine 85, n.º 1 (28 de janeiro de 2021): 49–67. http://dx.doi.org/10.1180/mgm.2021.8.

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AbstractFinely laminated (cm–μm scale) metalliferous precipitates are widespread in the surficial environment, especially around mineral deposits and reflect biogeochemical processes that can pervade near-surface environments on a larger scale. Examples in this paper involve precipitates of the transition metals Fe, Cu and Mn with minor Co, Ni, V and Zn; the metalloids As and Sb; and authigenic Au. Mobility and re-precipitation are driven primarily by geochemical disequilibrium, especially with respect to pH and redox states, that arises from complex interactions between biological processes, geological processes, and variations in the surrounding environment. Different degrees of chemical disequilibrium arise on small spatial scales on time scales of days to millennia. Interactions between biota, waters and rocks in these small near-surface settings affect the biogeochemical environments. Sulfur- and iron-oxidising bacteria are common biogeochemical agents associated with sulfide-bearing lithologies, but localised reductive environments can also develop, leading to gradients in pH and redox state and differential metal mobility. In general, there is commonly a spatial separation of Fe-rich precipitates from those with Cu and Mn, and other transition metals also follow Cu and Mn rather than Fe. Metalloids As and Sb have a strong affinity for Fe under oxidising conditions, but not under more reducing conditions. However, complex biogeochemical parageneses of laminated metalliferous deposits preclude prediction of finer formation details. The textures, mineral species, and metal associations within these deposits are likely to be encountered in all facets of mineral deposit development: initial exploration activity of near-surface locations, mining of shallow portions of orebodies, especially supergene zones, and downstream environmental management with respect to discharging metalliferous waters.

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44

Gehrke, T., R. Hallmann, K. Kinzler e W. Sand. "The EPS of Acidithiobacillus ferrooxidans - a model for structure-function relationships of attached bacteria and their physiology". Water Science and Technology 43, n.º 6 (1 de março de 2001): 159–67. http://dx.doi.org/10.2166/wst.2001.0365.

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To dissolve pyrite or sulphur, leaching bacteria like Acidithiobacillus ferrooxidans attach to these substrata by extracellular polymeric substances (specifically, lipopolysaccharides). The primary attachment to pyrite at pH 2 is mediated by exopolymer-complexed iron(III) ions in an electrostatic interaction with the negatively charged pyrite surface. Cells grown on sulphur exhibit a different composition of the extracellular lipopolysaccharides, namely with increased hydrophobic properties, and do not attach to pyrite. Thus, the cells adapt the chemical composition of their exopolymers to the substrate/substratum. It is concluded that the mechanism of bacterial pyrite oxidation is basically indirect. The actual corrosive agents are iron(III) ions. Preliminary data indicate that active strains complex more iron(III) ions in their EPS than less active ones. Obviously, the exopolymeric layer comprises a reaction space for the regeneration of these ions by the activity of the iron oxidising bacteria.

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45

Tsuchiya, Yugo, Sew Yeu Peak-Chew, Clare Newell, Sheritta Miller-Aidoo, Sriyash Mangal, Alexander Zhyvoloup, Jovana Bakovic´ et al. "Protein CoAlation: a redox-regulated protein modification by coenzyme A in mammalian cells". Biochemical Journal 474, n.º 14 (11 de julho de 2017): 2489–508. http://dx.doi.org/10.1042/bcj20170129.

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Coenzyme A (CoA) is an obligatory cofactor in all branches of life. CoA and its derivatives are involved in major metabolic pathways, allosteric interactions and the regulation of gene expression. Abnormal biosynthesis and homeostasis of CoA and its derivatives have been associated with various human pathologies, including cancer, diabetes and neurodegeneration. Using an anti-CoA monoclonal antibody and mass spectrometry, we identified a wide range of cellular proteins which are modified by covalent attachment of CoA to cysteine thiols (CoAlation). We show that protein CoAlation is a reversible post-translational modification that is induced in mammalian cells and tissues by oxidising agents and metabolic stress. Many key cellular enzymes were found to be CoAlated in vitro and in vivo in ways that modified their activities. Our study reveals that protein CoAlation is a widespread post-translational modification which may play an important role in redox regulation under physiological and pathophysiological conditions.

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46

Rathi, Meenakshi Virendra. "Comparative Study of Solvation Behaviour of Oxidising Agents Like Kclo3, Kbro3 and KIO3 in Aqueous Solvent Systems at Different Temperatures". Oriental Journal Of Chemistry 37, n.º 1 (28 de fevereiro de 2021): 151–56. http://dx.doi.org/10.13005/ojc/370120.

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The investigation of the solvationtrend of oxidizing agents like KClO3, KBrO3 and KIO3as electrolytes in aqueous salt solution rendersthe datasuited to interpret ion–ion, solute–solvent, ion-solvent and solvent–solvent interactions and synergy. Apparent molar volumes (∅_V) and viscosity B-coefficients for KClO3, KBrO3 and KIO3solutions in aqueous 0.5 % KCl ,system have been calculated from density (ρ) and viscosity (η) measurements at 298.15 to 313.15 K using a calibrated bicapillary pycnometer and the simple, yet accurate apparatus known as Ubbelohde viscometer respectively. Jones-Dole equation,Masson’s equation, Roots equation and Moulik’s equations are implemented to analyse various interactions inter and intra ionic attractions among the ion–ion, ion–solvent, and solute–solvent. Additionallythe apparent molar volumes of transfer Δ ∅(tr) and Rate constant diffusion controlled reaction (kd)are valuated.

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Mulahmetovic, Ensar, e Gráinne C. Hargaden. "Synthetic Routes to Oxazolines". Mini-Reviews in Organic Chemistry 16, n.º 6 (27 de agosto de 2019): 507–26. http://dx.doi.org/10.2174/1570193x15666180802105505.

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In this mini-review, the main synthetic routes used in the preparation of oxazolines is presented. The review is systematically carried out and the syntheses are presented in terms of precursors utilised (nitriles, aldehydes and carboxylic acids). Additionally, the reported synthesis of all chiral and achiral oxazolines involve either the use of amino alcohols as essential building blocks or some form of intramolecular cyclisation reactions. A comparison of the effectiveness of various reaction initiators such as Lewis acids, bases, oxidants and metals as well as their respective reaction conditions is also described. Lewis acid catalysts such as zinc chloride, zinc oxide and indium (III) chloride as well as triflic acid and ruthenium complexes are presented as effective catalysts in the formation of oxazolines from nitrile precursors. Oxidising agents such as N-bromosuccinimide, hypervalent iodine reagents and reducing agents such as butyllithium have been used in the formation oxazolines from aldehydes. While carboxylic acids have been used effectively as good precursors to oxazolines when using reagents such as cyanuric chloride as well as transition metal containing catalysts such as copper, ruthenium and titanium. In some cases, catalyst free reaction conditions have also been reported offering substituted oxazolines through microwave and ultrasonic irradiation as well as under standard reflux conditions.

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Pillay, C. S., e C. Dennison. "Cathepsin B Stability, But Not Activity, Is Affected in Cysteine:Cystine Redox Buffers". Biological Chemistry 383, n.º 7-8 (27 de agosto de 2002): 1199–204. http://dx.doi.org/10.1515/bc.2002.132.

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Abstract In order to test the hypothesis that the lysosomal cysteine protease cathepsin B may be redox regulated in vivo, cathepsin B activity and stability were measured in cysteine and/or cystinecontaining buffers. Cathepsin B activity in cysteinecontaining buffers was similar at pH 6.0 and pH 7.0, over all thiol concentrations tested. In contrast, the stability of the enzyme was greater at pH 6.0 than at pH 7.0. This suggests that the enzymes operational pH in vivo may be < pH 7.0. The activity of the enzyme was depressed in glutathionecontaining buffers. When assessed in cysteine:cystine redox buffers (pH 6.0 7.0) cathepsin B was active over a broad redox potential range, suggesting that cathepsin B activity may not be redox regulated. However, at pH 7.0, the stability of cathepsin B decreased with increasing reduction potential and ambient cystine concentration. This suggests that the stability of the enzyme at neutral pH is dependent on redox potential, and on the presence of oxidising agents.

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49

Pečivová, Pavlína, Vladimír Pavlínek e Jan Hrabě. "The effect of the combination of reducing and oxidising agents on the viscoelastic properties of dough and sensory characteristics of buns". Journal of the Science of Food and Agriculture 90, n.º 10 (19 de maio de 2010): 1681–87. http://dx.doi.org/10.1002/jsfa.4002.

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50

Ihsan, Yudi Nurul, Kalysta Fellatami, Rega Permana, Jiang Mingguo e Tri Dewi Kusumaningrum Pribadi. "The Optimization of Sulphide Oxidizing Bacteria (SOB) for Oil Corrosivity Reduction at Indramayu Coast, The Northern Coastal Area of West Java". Jurnal Ilmiah Perikanan dan Kelautan 14, n.º 2 (30 de agosto de 2022): 360–68. http://dx.doi.org/10.20473/jipk.v14i2.33462.

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Highlight Research First NR-SOB from Indramayu coast was successfully isolated and identified. Bactrerial characterization morphologically and biochemically, foster with in situ hybridization confirm the isolate was Thiobacillus denitrificans, and Arcobacter sp. Both isolate, Thiobacillus denitrificans and Arcobacter sp., were able to grow in sulphide rich environment in the presence of essential nutrient Thiobacillus denitrificans and Arcobacter sp. exhibit an outstanding sulphide oxidation ability up to 100% in the presence of nitrate. Abstract Crude oil production triggers the formation of hydrogen sulphide, also known as souring, which is extremely toxic and corrosive to the environment. It additionally give an adverse consequence to aquatic, terrestrial, and human existence. Studies of hydrogen sulphide reduction in sediments polluted by crude oil have been carried out recently to investigate the capability of indigenous Nitrate-Reducing Sulphide Oxidising Bacteria, hereinafter referred to as NR-SOB, as bioremediation agents. The experiments utilised hydrogen sulphide with 200 µM concentration combined with NO3 with different concentrations of 100 µM, 200 µM, and 300 µM. Measurements of the hydrogen sulfide concentrations were observed up to 48 hours within the experimental period. The SOB used in this study were taken from Balongan Bay at Indramayu coast using Nansen bottle to carry out water sample. The sulphide-oxidising ability of SOB was then evaluated at room temperature in control environment. Methylene blue method was applied to monitor the sulphide concentration. The results showed a complete removal of hydrogen sulphide concentrations in 48 hours accompanied with gradual drops of nitrate in all experiment series. Sulphide oxidation rate was detected to appear between 6.8 and 10.2 fmol/cell/hour. Measurements of cell abundance after 48 hours showed 6.2 x 105, 7.5 X 105, and 8.2 X 105 cell/ml from Experiments I, II, and III respectively. Using MSS selective medium, the bacteria were identified as Thiobacillus denitrificans and Arcobacter sp. Overall, the isolated NR-SOB from the coast of Balongan Bay, Indramayu proves to be a promising candidate for sulphide controls and mitigation.

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