Search results

1

Basic energetic parameters of Acanthamoeba castellanii mitochondria and their resistance to oxidative stress

100%

Jarmuszkiewicz W., Antos-Krzeminska N., Drachal-Chrul D., Matkovic K., Nobik W., Pieńkowska J., Swida A., Woyda-Ploszczyca A., Budzinska M.

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2008

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vol. 55

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issue 2

349-356

EN

The purpose of this study was establishing the basic energetic parameters of amoeba Acanthamoeba castellanii mitochondria respiring with malate and their response to oxidative stress caused by hydrogen peroxide in the presence of Fe2+ ions. It appeared that, contrary to a previous report (Trocha LK, Stobienia O (2007) Acta Biochim Polon 54: 797), H2O2-treated mitochondria of A. castellanii did not display any substantial impairment. No marked changes in cytochrome pathway activity were found, as in the presence of an inhibitor of alternative oxidase no effects were observed on the rates of uncoupled and phosphorylating respiration and on coupling parameters. Only in the absence of the alternative oxidase inhibitor, non-phosphorylating respiration progressively decreased with increasing concentration of H2O2, while the coupling parameters (respiratory control ratio and ADP/O ratio) slightly improved, which may indicate some inactivation of the alternative oxidase. Moreover, our results show no change in membrane potential, Ca2+ uptake and accumulation ability, mitochondrial outer membrane integrity and cytochrome c release for 0.5-25 mM H2O2-treated versus control (H2O2-untreated) mitochondria. These results indicate that short (5 min) incubation of A. castellanii mitochondria with H2O2 in the presence of Fe2+ does not damage their basic energetics.

2

Cytoprotective effect of methanolic extract of Nardostachys jatamansi against hydrogen peroxide induced oxidative damage in C6 glioma cells

100%

Dhuna K., Dhuna V., Bhatia G., Singh J., Kamboj S. S.

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2013

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vol. 60

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issue 1

21-31

EN

Oxidative stress has been implicated as an important factor in the process of neurodegeneration and hydrogen peroxide (H2O2) is one of the most important precursors of reactive oxygen species (ROS), responsible for many neurodegenerative diseases. This study used extracts from Nardostachys jatamansi rhizomes, known for nerve relaxing properties in Ayurvedic medicine, to ascertain their protective role in H2O2-induced oxidative stress in C6 glioma cells. The protective effect of methanolic, ethanolic and water extracts of N. jatamansi (NJ-MEx, NJ-EEx and NJ-WEx respectively) was determined by MTT assay. NJ-MEx significantly protected against H2O2 cytotoxicity when cells were pretreated for 24 h. The level of antioxidant enzymes, catalase, superoxide dismutase (Cu-ZnSOD), glutathione peroxidase (GPx), and a direct scavenger of free radicals, glutathione (GSH), significantly increased following pre-treatment with NJ-MEx. Lipid peroxidation (LPx) significantly decreased in NJ-MEx-pretreated cultures. The expression of a C6 differentiation marker, GFAP (glial fibrillary acidic protein), stress markers HSP70 (heat shock protein) and mortalin (also called glucose regulated protein 75, Grp75) significantly decreased when cells were pre-treated with NJ-MEx before being subjected to H2O2 treatment as shown by immunofluorescence, western blotting and RT-PCR results. The present study suggests that NJ-MEx could serve as a potential treatment and/or preventive measure against neurodegenerative diseases.

3

Kinetics of the decomposition and the estimation of the stability of 10% aqueous and non-aqueous hydrogen peroxide solutions

100%

Zun M., Dwornicka D., Wojciechowska K., Swiader K., Kasperek R., Rzadkowska M., Poleszak E.

Current Issues in Pharmacy and Medical Sciences

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2014

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vol. 27

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issue 4

213-216

EN

In this study, the stability of 10% hydrogen peroxide aqueous and non-aqueous solutions with the addition of 6% (w/w) of urea was evaluated. The solutions were stored at 20°C, 30°C and 40°C, and the decomposition of hydrogen peroxide proceeded according to first-order kinetics. With the addition of the urea in the solutions, the decomposition rate constant increased and the activation energy decreased. The temperature of storage also affected the decomposition of substance, however, 10% hydrogen peroxide solutions prepared in PEG-300, and stabilized with the addition of 6% (w/w) of urea had the best constancy.

4

Labile iron pool correlates with iron content in the nucleus and the formation of oxidative DNA damage in mouse lymphoma L5178Y cell lines.

100%

Kruszewski M., Iwaneńko T.

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2003

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vol. 50

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issue 1

211-215

EN

Labile iron pool (LIP) constitutes a crossroad of metabolic pathways of iron-containing compounds and is midway between the cellular need for iron, its uptake and storage. In this study we investigated oxidative DNA damage in relation to the labile iron pool in a pair of mouse lymphoma L5178Y (LY) sublines (LY-R and LY-S) differing in sensitivity to hydrogen peroxide. The LY-R cells, which are hydrogen peroxide-sensitive, contain 3 times more labile iron than the hydrogen peroxide-resistant LY-S cells. Using the comet assay, we compared total DNA breakage in the studied cell lines treated with hydrogen peroxide (25 μM for 30 min at 4°C). More DNA damage was found in LY-R cells than in LY-S cells. We also compared the levels of DNA lesions sensitive to specific DNA repair enzymes in both cell lines treated with H2O2. The levels of endonuclease III-sensitive sites and Fapy-DNA glycosylase-sensitive sites were found to be higher in LY-R cells than in LY-S cells. Our data suggest that the sensitivity of LY-R cells to H2O2 is partially caused by the higher yield of oxidative DNA damage, as compared to that in LY-S cells. The critical factor appears to be the availability of transition metal ions that take part in the OH radical-generating Fenton reaction (very likely in the form of LIP).

5

Hydrogen peroxide as a biodegradation stimulator in remediation processes of soils heavily contaminated with petrochemicals

100%

Rosik-Dulewska C., Krzyśko-Łupicka T., Ciesielczuk T., Kręcidło Ł.

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EN

The soil contaminated with petroleum products must be excluded from the crops and treated to reclamation processes. Natural processes of decomposition of hydrocarbon compounds go very slow, so it is necessary to use bioaugumentation or stimulation in order to accelerate the return of the soil to high culture. In this study the effect of hydrogen peroxide on the process of cleaning soil strongly contaminated with pertochemicals was investigated. For this purpose, a pot experiment lasting 60 days was carried. The dynamics of changes in the population of filamentous fungi, yeasts and bacteria were examined and also content of aliphatic hydrocarbons (n-alkanes), monoaromatic and polycyclic aromatic hydrocarbons (PAHs). Experimental use of hydrogen peroxide in the process of biodegradation of petroleum compounds assisted in the analyzed soil led to an increase of the number of grampositive bacteria during the test. Stimulation of oil products biodegradation by hydrogen peroxide also increased by 35% decomposition efficiency of aliphatic hydrocarbons (C8-C40) and about 50% PAH’s in comparison to control samples without hydrogen peroxide. There was no influence of hydrogen peroxide on the content of monoaromatic hydrocarbons (BTEX) with respect to controls, although in the end of experiment, the total concentration decreased by about 50% compared to the initial content.

6

Numerical analysis of micro ring-engine fluid dynamics

89%

Piechna J., Piechna J.

Archive of Mechanical Engineering

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2009

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vol. 56

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issue 2

7

The Effect of Phosphates and Fluorides, Included in TiO2 Nanotube Layers on the Performance of Hydrogen Peroxide Detection

88%

Arkusz K., Krasicka-Cydzik E.

Archives of Metallurgy and Materials

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2018

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vol. 63

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issue 2

8

Bis(3-methyl-1-propene) ether and 3-(3-methyl-1-propene)-3-methyl-1,2-epoxypropane ether synthesis during the epoxidation of 1-butene-3-ol with hydrogen peroxide over the TS-2 catalyst

88%

Wróblewska A., Wójtowicz G.

Polish Journal of Chemical Technology

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2010

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vol. 12

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issue 3

66-71

EN

The influence of technological parameters on the transformation of 1-butene-3-ol (1B3O) to bis(3-methyl-1-propene) ether (2×1B3O ether) and 3-(3-methyl-1-propene)-3-methyl-1,2-epoxypropane ether (1B3Ox1,2EB3O ether) over the TS-2 catalyst was presented. The reaction was performed in a glass reactor at atmospheric pressure and in methanol medium (protic solvent). The optimum conditions of 2×1B3O ether and 1B3Ox1,2EB3O ether obtaining were established by the mathematical method of experiments design (rotatable-uniform design) and after the analyses of the layer drawings.

9

Epoxidation of 1,5,9-cyclododecatriene with H2O2in the presence of tungstophosphoric acid (H3PW12O40)

88%

Wołosiak A., Lewandowski G.

Polish Journal of Chemical Technology

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2010

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vol. 12

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issue 3

40-44

EN

The influence of the technological parameters on the epoxidation of 1,5,9-cyclododecatriene (CDT) to 1,2-epoxy-5,9-cyclododecadiene (ECDD) by the phase-transfer catalysis method (PTC) in the presence of tungstophosphoric heteropolyacid (H3PW12O40) and hydrogen peroxide as the oxidizing agent has been presented. The phase-transfer catalyst was Aliquat® 336 (methyltrioctylammonium chloride). The epoxidation of CDT to ECDD in the PTC system proceed under the relatively mild condition: low temperature, lack of solvent, short reaction time.The effect of: the mixing velocity, the molar ratio of CDT:H2O2 and H2O2:H3PW12O40, the nature of the solvent and its concentration, was studied. The most advantageous technological parameters were: the mixing rate 400 - 600 rpm, the molar ratio of CDT:H2O2 = 3:1 - 1.5:1, the molar ratio of H2O2:H3PW12O40 = 200:1 - 400:1, the temperature 40 - 50°C, solvent: dichloromethane or lack of the solvent, dichloromethane concentration: 10 - 50 vol%, reaction time 35 - 50 min. The application of the above-mentioned parameters allows to achieve the yield of 44 - 47% ECDD in relation to introduced CDT.

10

Combined treatment of toxic cyanobacteria Microcystis aeruginosa with hydrogen peroxide and microcystin biodegradation agents results in quick toxin elimination

88%

Dziga D., Maksylewicz A., Maroszek M., Marek S.

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2018

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vol. 65

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issue 1

133-140

EN

Under some conditions the growth of toxic cyanobacteria must be controlled by treatment with algicidal compounds. Hydrogen peroxide has been proposed as an efficient and relatively safe chemical which can remove cyanobacteria from the environment selectively, without affecting other microorganisms. However, the uncontrolled release of secondary metabolites, including toxins may occur after such a treatment. Our proposal presented in this paper concerns fast biodegradation of microcystin released after cell lysis induced by hydrogen peroxide. The effectiveness of both, Sphingomonas sp. and heterologously expressed MlrA enzyme, in the removal of the toxin from Microcystis aeruginosa culture was investigated. The results indicate that neither Sphingomonas cells nor MlrA are affected by hydrogen peroxide at the concentrations which stop the growth of cyanobacteria. A several-fold reduction in microcystin levels was documented in the presence of these agents with biodegradation ability. Our results provide evidence that such a combined treatment of water reservoirs dominated by microcystin-producing cyanobacteria may be a promising alternative which allows fast elimination of both, the bloom forming species and toxins, from the environment.

11

Influence of electrode material on hydrogen peroxide generation by DC pinhole discharge

88%

Vyhnánková E., Kozáková Z., Krčma F., Hrdlička A.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

In this work, several materials were studied as electrodes in a pinhole configuration of a DC plasma discharge to estimate their effect on the efficiency of the discharge, indicated by hydrogen peroxide production. Detection was carried out using a specific titanium reagent. This was combined with ICP-OES analysis of the final solutions to determine the difference between the amount of electrode material released during the discharge operation and electrolysis experiment carried out under the same conditions. It was found that from seven studied electrode materials, graphite gives the best results, while lower cost aluminum and titanium-zinc still work well. The most unsuitable materials were copper and brass; in these cases, no hydrogen peroxide was detected in the cathode part of the reactor. Results obtained by ICP analysis indicate that even in the case of brass, the absence of hydrogen peroxide is due to the presence of copper in the material. It probably affects both directly the phase of discharge creation and propagation and the decomposition reactions.

12

Thermal stability for the effective use of commercial catalase

88%

Miłek J., Wójcik M., Verschelde W.

Polish Journal of Chemical Technology

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2014

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vol. 16

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issue 4

75-79

EN

Catalase with the commercial catalase name Terminox Ultra is widely used in the textile industry in bleaching processes. This enzyme is used to catalyse the decomposition of residual hydrogen peroxide into oxygen and water. In this study catalase was kept for about 30 hours in water baths in a temperature range from 35 to 70°C. For the first time, the kinetics of thermal deactivation of this enzyme was examined using an oxygen electrode. Stability of the enzyme depends strongly on temperature and its half-life times are 0.0014 h and 7.6 h, at 35 and 70°C, respectively.

13

Antibacterial effects of hydrogen peroxide and caprylic acid on selected foodborne bacteria

88%

Výrostková J., Pipová M., Semjon B., Jevinová P., Regecová I., Maľová J., Výrostková J., Pipová M., Semjon B., Jevinová P., Regecová I., Maľová J.

Polish Journal of Veterinary Sciences

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2020

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vol. 23

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issue 3

14

Advanced oxidation processes for decolorization of aqueous solution containing acid red G azo dye

88%

Surpăţeanu M., Zaharia C.

Open Chemistry

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2004

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vol. 2

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issue 4

573-588

EN

Some investigations concerning the decolorization of Acid Red G azo dye by photooxidation with hydrogen peroxide were performed. The influences of pH, oxidant concentration, and the presence of Fe2+ or other metal ions (Co2+, Cu2+, Ni2+, Mn2+) as potential catalysts, were investigated. The best results were obtained in the presence of ferrous ions in acid and neutral media. The other ions are not as effective as Fe2+ for dye decolorization. Co2+ and Cu2+ ions have a catalytic action, at low concentration, within a wide range of pH. Ni2+ and Mn2+ ions have no catalytic effect in photooxidation with hydrogen peroxide at acid Ni2+ and Mn2+ ions have no catalytic effect in photooxidation with hydrogen peroxide at acid pH values, but show a weak action in alkaline media.

15

Alleviation Ofzinnia elegansJacq. Seed Deterioration Using Hydrogen Peroxide and Organic Acids

88%

Szopińska D.

Ecological Chemistry and Engineering S

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2014

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vol. 21

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issue 2

309-326

EN

The decrease of seed quality during storage is strongly associated with damage caused by free radicals. Some compounds of natural origin, known due to their antioxidative and antifungal properties, may be potentially used in organic production for seed treatment as an alternative to pesticides. The aim of the experiment was to study an ability of hydrogen peroxide and organic acid to improve germination, vigour and health of non-deteriorated and deteriorated zinnia seeds. Two seed samples, cv. Illumination and Orys, varying in initial infestation with fungi were tested. For deterioration seeds were kept at 30°C and 80% RH for 30 days. Seed quality tests were performed before and after deterioration for controls and seeds soaked in 3.0% hydrogen peroxide solution and in 1.0 and 5.0% solutions of ascorbic and lactic acids for 10, 30 and 60 min. The controls were untreated seeds, seeds soaked in 0.2% solution of Kaptan zawiesinowy 50 WP for 30 min and seeds soaked in distilled water for 10, 30 and 60 min. Treating zinnia seeds with organic acids more significantly affected seed germination and health after deterioration than before, and improvement of germination capacity was usually correlated with decrease of the percentage of abnormal diseased seedlings. Deterioration had no influence on mean germination time, whereas in particular cases treating seeds with hydrogen peroxide and organic acids negatively affected this parameter. After deterioration regardless of treatment increased number of seeds free from fungi. Lactic acid followed by hydrogen peroxide and ascorbic acid effectively limited growth of A. alternata, A. zinnia and Fusarium spp. on zinnia seeds, however at higher concentration negatively affected seed germination and vigour. Moreover, treating seeds with hydrogen peroxide and organic acids many a time increased seeds infestation with B. cinerea.

16

Oxidation of Cyclohexene with H₂O₂ Catalyzed by Vanadium Based Polyoxometalates Doped Modified Clays as Green Catalysts

88%

Boudjema S., Rabah H., Choukchou-Braham A.

Acta Physica Polonica A

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2017

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vol. 132

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issue 3

469-472

EN

The catalytic performance of supported heteropolyacids in various liquid-solid and gas-solid heterogeneous reactions may be affected by the choice of support and/or the method of heteropolyacid deposition. Vanadium substituted polyphosphomolybdate with the Keggin structure H₄[PVMo₁₁O₄₀]· 13H₂O (PVMo) was dispersed throughout acid activated bentonite (clay from Hammam Boughrara, Maghnia, Algeria). A series of catalysts were prepared via modified impregnation. Modified preparation method employed ultrasonication as a means of the dispersion homogenization, followed by freeze-drying. The catalysts were characterized by the Brunauer-Emmett-Teller, the Fourier transform infrared, and ³¹P solid-state magic angle spinning-NMR spectroscopy. The catalytic performance of PVMo/Hmont was evaluated in the oxidation of cyclohexene. Intact Keggin anions were preserved on Hmont after deposition aided by ultrasonication. The obtained results showed that a better catalytic activity can be obtained with PVMo/bentonite (98% of conversion and 89% of cyclohexene oxide), by drop addition of H₂O₂, for 3 h.

17

The Ti-MWW catalyst - its characteristic and catalytic properties in the epoxidation of allyl alcohol by hydrogen peroxide

88%

Wróblewska A., Fajdek A., Milchert E., Grzmil B.

Polish Journal of Chemical Technology

|

2010

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vol. 12

|

issue 1

29-34

EN

Ti-MWW, one of the latest titanium-silicalite catalysts, has been prepared by direct hydrothermal synthesis using hexamethyleneimine as a structure-directing agent. The characteristic of the catalyst was performed by means of the following methods: XRD, SEM, IR, UV-vis and X'Ray microanalysis. The catalytic properties of Ti-MWW have been compared with those of the conventional titanium-silicalites TS-1 and TS-2 in the epoxidation of allyl alcohol with hydrogen peroxide. The process has been described by the following main functions: the selectivity of the transformation to glycidol in relation to allyl alcohol consumed, the conversions of the substrates (allyl alcohol and hydrogen peroxide) and the selectivity of the transformation to organic compounds in relation to hydrogen peroxide consumed.

18

Comparison of the methods of the phase transfer catalysis and hydroperoxide in the epoxidation of 1,5,9-cyclododecatriene

88%

Lewandowski G.

Polish Journal of Chemical Technology

|

2007

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vol. 9

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issue 3

101-104

EN

The process of the epoxidation of cis, trans, trans-1,5,9-cyclododecatriene (CDT) to 1,2-epoxy-5,9-cyclododecadiene (ECDD) with the 30% aqueous hydrogen peroxide under the phase transfer conditions and with tert-butyl hydroperoxide under the homogeneous conditions was investigated. Onium salts such as Aliquat® 336, Arquad® 2HT, methyltrioctylammonium bromide and the Na2WO4/H3PO4 catalyst system are very active under the phase transfer catalysis (PTC) conditions for the selective epoxidation of cis, trans, trans-1,5,9-cyclododecatiene (PTC method). These catalytic systems were found to be as active and selective as the homogeneous phase system Mo(CO)6/TBHP (hydroperoxide method).

19

A new oxidation process. Transformation of gem-bishydroperoxides into esters

75%

Terent’ev A., Platonov M., Kutkin A.

Open Chemistry

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2006

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vol. 4

|

issue 2

207-215

EN

A new oxidation process has been found where α,ω-dicarboxylic acid esters and ω-hydroxycarboxylic acid esters are formed on heating gem-bishydroperoxides in alcohol in the presence of BF3·Et2O. By addition of H2O2 to this reaction α,ω-dicarboxylic acid esters are formed almost selectively.

20

Histological changes induced during the biotrophic phase of infection of three potato varieties by Phytophthora infestans (Mont.) de Bary

75%

Gaviria A. E., Patiño L. F., Morales J. G., Gaviria A. E., Patiño L. F., Morales J. G.

Journal of Plant Protection Research

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2019

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vol. 59

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issue 4

Refine search results

Basic energetic parameters of Acanthamoeba castellanii mitochondria and their resistance to oxidative stress

Cytoprotective effect of methanolic extract of Nardostachys jatamansi against hydrogen peroxide induced oxidative damage in C6 glioma cells

Kinetics of the decomposition and the estimation of the stability of 10% aqueous and non-aqueous hydrogen peroxide solutions

Labile iron pool correlates with iron content in the nucleus and the formation of oxidative DNA damage in mouse lymphoma L5178Y cell lines.

Hydrogen peroxide as a biodegradation stimulator in remediation processes of soils heavily contaminated with petrochemicals

Numerical analysis of micro ring-engine fluid dynamics

The Effect of Phosphates and Fluorides, Included in TiO2 Nanotube Layers on the Performance of Hydrogen Peroxide Detection

Bis(3-methyl-1-propene) ether and 3-(3-methyl-1-propene)-3-methyl-1,2-epoxypropane ether synthesis during the epoxidation of 1-butene-3-ol with hydrogen peroxide over the TS-2 catalyst

Epoxidation of 1,5,9-cyclododecatriene with H2O2in the presence of tungstophosphoric acid (H3PW12O40)

Combined treatment of toxic cyanobacteria Microcystis aeruginosa with hydrogen peroxide and microcystin biodegradation agents results in quick toxin elimination

Influence of electrode material on hydrogen peroxide generation by DC pinhole discharge

Thermal stability for the effective use of commercial catalase

Antibacterial effects of hydrogen peroxide and caprylic acid on selected foodborne bacteria

Advanced oxidation processes for decolorization of aqueous solution containing acid red G azo dye

Alleviation Ofzinnia elegansJacq. Seed Deterioration Using Hydrogen Peroxide and Organic Acids

Oxidation of Cyclohexene with H₂O₂ Catalyzed by Vanadium Based Polyoxometalates Doped Modified Clays as Green Catalysts

The Ti-MWW catalyst - its characteristic and catalytic properties in the epoxidation of allyl alcohol by hydrogen peroxide

Comparison of the methods of the phase transfer catalysis and hydroperoxide in the epoxidation of 1,5,9-cyclododecatriene

A new oxidation process. Transformation of gem-bishydroperoxides into esters

Histological changes induced during the biotrophic phase of infection of three potato varieties by Phytophthora infestans (Mont.) de Bary