keyword
MENU ▼
Read by QxMD icon Read
search

Hydrogen peroxide

keyword
https://www.readbyqxmd.com/read/28806719/comparison-of-reactive-oxygen-species-metabolism-during-grape-berry-development-between-kyoho-and-its-early-ripening-bud-mutant-fengzao
#1
Fei-Fei Xi, Li-Li Guo, Yi-He Yu, Yan Wang, Qiong Li, Hui-Li Zhao, Guo-Hai Zhang, Da-Long Guo
Enzymes and non-enzyme elements related to the metabolism of reactive oxygen species (ROS), such as catalase (CAT), superoxide dismutase (SOD), ascorbic acid (AsA), glutathione (GSH), NADPH oxidase (NOX), hydrogen peroxide (H2O2), superoxide anion (O2(-)), lipoxygenase (LOX) and malondialdehyde (MDA), were measured in 'Kyoho' and its early ripening bud mutant 'Fengzao' to compare ROS level changes and investigate the potential roles of ROS in grape berry development and the ripening process. In addition, the anthocyanin and sugar contents as well as berry diameter were also investigated at different berry development stages...
August 9, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28806678/the-sorptive-and-reductive-capacities-of-biochar-supported-nanoscaled-zero-valent-iron-nzvi-in-relation-to-its-crystallite-size
#2
Shengsen Wang, Yanxia Zhou, Bin Gao, Xiaozhi Wang, Xianqiang Yin, Ke Feng, Jun Wang
In this work, nZVI was immobilized by bamboo derived biochars (nZVI/BB), hydrogen peroxide (H2O2) (nZVI/PBB) and nitric acid (HNO3) (nZVI/HBB) modified BB. H2O2 and HNO3 deceased surface area and pore volume of pristine biochars. Total iron (Fe) contents were 16.50, 24.40, and 13.08% for nZVI/BB, nZVI/PBB and nZVI/HBB, respectively. The X-ray diffraction revealed that nZVI in biochar matrix was dominantly metallic Fe coated with Fe oxides. The transmission electron microscopy indicated nZVI particle sizes were 41...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28806493/olaparib-a-clinically-used-poly-adp-ribose-polymerase-inhibitor-protects-against-oxidant-induced-cardiac-myocyte-death-in-vitro-and-improves-cardiac-contractility-during-early-phase-after-heart-transplantation-in-a-rat-model-in-vivo
#3
Sevil Korkmaz-Icöz, Bartosz Szczesny, Michela Marcatti, Shiliang Li, Mihály Ruppert, Felix Lasitschka, Sivakkanan Loganathan, Csaba Szabo, Gábor Szabó
BACKGROUND AND PURPOSE: Olaparib, rucaparib and niraparib, potent inhibitors of poly(ADP-ribose) polymerase (PARP) have recently been approved for human use for oncological indications. Considering the previously demonstrated role of PARP in various forms of acute and chronic myocardial injury, we tested the effect of olaparib in in-vitro models of oxidative stress in cardiomyocytes, and in an in-vivo model of cardiac transplantation. EXPERIMENTAL APPROACH: H9c2-embryonic rat heart-derived myoblasts pretreated with vehicle or olaparib (10μM) were challenged with either hydrogen-peroxide (H2 O2 ) or with glucose-oxidase (GOx, which generates H2 O2 in the tissue culture medium)...
August 14, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28805461/a-new-caffeic-acid-tetramer-from-the-dracocephalum-moldavica-l
#4
Jun-Liang Zhang, Ren-Jie Yan, Ning Yu, Xue Zhang, Dai-Jie Chen, Tong Wu, Jian-Guo Xin
A new caffeic acid tetramer compound, named (+) methyl rabdosiin (4), together with seven known caffeic acid multimers (1-3, 5-8) and one caffeic acid monomer (9), were isolated from the aerial parts of Dracocephalum moldavica L. The structures of these compounds were assigned on the basis of 1D and 2D NMR spectroscopic and mass spectrometry analyses. The protective effects of compounds 2-4 against hydrogen peroxide (H2O2)-induced apoptosis were evaluated in primary cardiomyocytes of SD neonatal rats in vitro by the MTT method...
August 14, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28805389/overcoming-reductant-interference-in-peroxidase-based-assays-for-hydrogen-peroxide-quantification
#5
Shu Jiang, Michael H Penner
A problem commonly encountered when using peroxidase-based methods for hydrogen peroxide quantification in biobased matrixes is interference due to the presence of endogenous reductants. Such assays are typically based on the generation of an oxidized reporter molecule in direct proportion to the amount of hydrogen peroxide reduced in the peroxidase-catalyzed reaction. Endogenous reductants confound such assays by reducing the oxidized reporter molecule, thus resulting in underestimates of hydrogen peroxide content...
August 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28805371/wavelength-resolved-photon-fluxes-of-indoor-light-sources-implications-for-hox-production
#6
Shawn Finley Kowal, Seth Robert Allen, Tara F Kahan
Photochemistry is a largely-unconsidered potential source of reactive species such as hydroxyl and peroxy radicals (OH and HO2, "HOx") indoors. We present measured wavelength-resolved photon fluxes and distance dependences of indoor light sources including halogen, incandescent, and compact fluorescent lights (CFL) commonly used in residential buildings; fluorescent tubes common in industrial and commercial settings; and sunlight entering buildings through windows. We use these measurements to predict indoor HOx production rates from the photolysis of nitrous acid (HONO), hydrogen peroxide (H2O2), ozone (O3), formaldehyde (HCHO) and acetaldehyde (CH3CHO)...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28804719/effect-of-2-bleaching-agents-with-a-content-of-high-concentrated-hydrogen-peroxide-on-stained-2-cad-cam-blocks-and-a-nanohybrid-composite-resin-an-afm-evaluation
#7
İzgen Karakaya, Esra Cengiz
The aim of this study was to evaluate color stability of 3 restorative materials, discoloration ability of different solutions, efficacy of 2 office bleaching agents, and surface roughness and topography. Sixty specimens for Clearfil Majesty Esthetic (CME), Lava Ultimate (LU), and Vita Enamic (VE) were prepared. They were immersed into 3 staining solutions for 2 weeks and then they were bleached. According to the measured L(⁎), a(⁎), and b(⁎) parameters described by CIELAB system, color changes (ΔE00), translucency parameters (TP), whiteness index values (W(⁎)), and changes in closeness to pure white (ΔW(⁎)) were calculated...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28804681/luminol-amplified-chemiluminescence-detects-mainly-superoxide-anion-produced-by-human-neutrophils
#8
Samia Bedouhène, Farida Moulti-Mati, Margarita Hurtado-Nedelec, Pham My-Chan Dang, Jamel El-Benna
Reactive oxygen species (ROS) are produced by numerous biological systems and by several phagocytes such as neutrophils and macrophages. ROS include mostly superoxide anion, hydrogen peroxide, singlet oxygen and hydroxyl radical, which are involved in a variety of biological processes such as immunity, inflammation, apoptosis and cell signaling. Thus, there is a need for a sensitive and reliable method to measure ROS. The luminol-amplified chemiluminescence technique is widely used to measure ROS production by neutrophils; however, it is unclear which ROS species are detected by this technique...
2017: American Journal of Blood Research
https://www.readbyqxmd.com/read/28803127/direct-antioxidant-properties-of-methotrexate-inhibition-of-malondialdehyde-acetaldehyde-protein-adduct-formation-and-superoxide-scavenging
#9
Matthew C Zimmerman, Dahn L Clemens, Michael J Duryee, Cleofes Sarmiento, Andrew Chiou, Carlos D Hunter, Jun Tian, Lynell W Klassen, James R O'Dell, Geoffrey M Thiele, Ted R Mikuls, Daniel R Anderson
Methotrexate (MTX) is an immunosuppressant commonly used for the treatment of autoimmune diseases. Recent observations have shown that patients treated with MTX also exhibit a reduced risk for the development of cardiovascular disease (CVD). Although MTX reduces systemic inflammation and tissue damage, the mechanisms by which MTX exerts these beneficial effects are not entirely known. We have previously demonstrated that protein adducts formed by the interaction of malondialdehyde (MDA) and acetaldehyde (AA), known as MAA-protein adducts, are present in diseased tissues of individuals with rheumatoid arthritis (RA) or CVD...
August 2, 2017: Redox Biology
https://www.readbyqxmd.com/read/28802666/humanin-directly-protects-cardiac-mitochondria-against-dysfunction-initiated-by-oxidative-stress-by-decreasing-complex-i-activity
#10
Savitree Thummasorn, Krekwit Shinlapawittayatorn, Juthamas Khamseekaew, Thidarat Jaiwongkam, Siriporn C Chattipakorn, Nipon Chattipakorn
Humanin (HN) is an endogenous peptide that exerts cytoprotection against oxidative stress and apoptosis. We recently reported that Humanin analogue (HNG) pretreatment can reduce reactive oxygen species production in the heart subjected to ischemia/reperfusion (I/R) injury via attenuating mitochondrial dysfunction. However, it is unclear if HNG has direct effects on mitochondrial function against oxidative stress. Thus, we sought to determine the effects of HNG on mitochondrial function under hydrogen peroxide (H2O2) induced oxidative stress in isolated cardiac mitochondria...
August 9, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28802018/characterization-of-two-catalase-peroxidase-encoding-genes-in-fusarium-verticillioides-reveals-differential-responses-to-in-vitro-versus-in-planta-oxidative-challenges
#11
Shan Gao, Scott E Gold, Anthony E Glenn
Catalase/peroxidases (KatGs) are a superfamily of reactive oxygen species (ROS)-degrading enzymes believed to be horizontally acquired by ancient Ascomycota from bacteria. Subsequent gene duplication resulted in two KatG paralogs in ascomycetes: the widely distributed intracellular KatG1 group, and the phytopathogen-dominated extracellular KatG2 group. To functionally characterize FvCP01 (KatG1) and FvCP02 (KatG2) in the maize pathogen Fusarium verticillioides, single and double gene deletion mutants were examined in response to hydrogen peroxide (H2 O2 )...
August 12, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28801702/paeonol-attenuates-aging-mrc-5-cells-and-inhibits-epithelial-mesenchymal-transition-of-premalignant-hacat-cells-induced-by-aging-mrc-5-cell-conditioned-medium
#12
Lihua Yang, Shangping Xing, Kun Wang, Hua Yi, Biaoyan Du
Senescence-associated secretory phenotype (SASP) factors, such as IL-6 and IL-8, are extremely critical in tissue microenvironment. Senescent human fibroblasts facilitate epithelial-mesenchymal transition (EMT) in premalignant epithelial cells mainly through the secretion of SASP factors. Meanwhile, premalignant human HaCaT Keratinocyte (HaCaT) cells as immortal epithelial cells are susceptible to malignant transformation. Paeonol, an herbal phenolic component found in peonies, exerts anti-aging and anti-tumor efficacies, while the molecular mechanisms of paeonol on EMT in premalignant HaCaT cells induced by SASP factors are unclear...
August 12, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28800400/mechanism-of-tfam-mediated-cardiomyocyte-protection
#13
George H Kunkel, Pankaj Chaturvedi, Nicholas Theilen, Rohit Nair, Suresh C Tyagi
Although mitochondrial transcription factor A (TFAM) is a protective component of mitochondrial DNA and a regulator of calcium and reactive oxygen species (ROS) production, the mechanism remains unclear. In heart failure (HF), TFAM is significantly decreased and cardiomyocyte instability ensues. TFAM inhibits Nuclear Factor of Activated T cells (NFAT), which reduces ROS production; additionally, TFAM transcriptionally activates SERCA2a to decrease free calcium. Therefore, decreasing TFAM vastly increases protease expression and hypertrophic factors, leading to cardiomyocyte functional decline...
August 11, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28798768/laccase-13-regulates-seed-setting-rate-by-affecting-hydrogen-peroxide-dynamics-and-mitochondrial-integrity-in-rice
#14
Yang Yu, Quan-Feng Li, Jin-Ping Zhang, Fan Zhang, Yan-Fei Zhou, Yan-Zhao Feng, Yue-Qin Chen, Yu-Chan Zhang
Seed setting rate is one of the most important components of rice grain yield. To date, only several genes regulating setting rate have been identified in plant. In this study, we showed that laccase-13 (OsLAC13), a member of laccase family genes which are known for their roles in modulating phenylpropanoid pathway and secondary lignification in cell wall, exerts a regulatory function in rice seed setting rate. OsLAC13 expressed in anthers and promotes hydrogen peroxide production both in vitro and in the filaments and anther connectives...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28797310/maternal-intake-of-trans-unsaturated-or-interesterified-fatty-acids-during-pregnancy-and-lactation-modifies-mitochondrial-bioenergetics-in-the-liver-of-adult-offspring-in-mice
#15
Patricia C de Velasco, Gustavo Chicaybam, Dionizio M Ramos-Filho, Raísa M A R Dos Santos, Caroline Mairink, Fátima L C Sardinha, Tatiana El-Bacha, Antonio Galina, Maria das Graças Tavares-do-Carmo
The quality of dietary lipids in the maternal diet can programme the offspring to diseases in later life. We investigated whether the maternal intake of palm oil or interesterified fat, substitutes for trans-unsaturated fatty acids (FA), induces metabolic changes in the adult offspring. During pregnancy and lactation, C57BL/6 female mice received normolipidic diets containing partially hydrogenated vegetable fat rich in trans-unsaturated fatty acids (TG), palm oil (PG), interesterified fat (IG) or soyabean oil (CG)...
July 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28797210/removal-of-methyl-orange-by-heterogeneous-fenton-catalysts-prepared-using-glycerol-as-green-reducing-agent
#16
Natália S F Trotte, M Alzamora, D R Sánchez, Nakédia M F Carvalho
This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange. The catalysts were characterized by XRD, AAS, SEM, TEM, thermogravimetric analyses, Mössbauer and FTIR spectroscopies, which revealed the formation of iron(II)/(III) oxalates from the oxidation of glycerol by the iron(III) nitrate precursor. Besides, iron oxihydroxide nanoparticles with superparamagnetic behavior were also formed...
August 10, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28796788/different-behavior-of-myeloperoxidase-in-two-rodent-amoebic-liver-abscess-models
#17
Andrea Cruz-Baquero, Luz María Cárdenas Jaramillo, Manuel Gutiérrez-Meza, Rosa Adriana Jarillo-Luna, Rafael Campos-Rodríguez, Víctor Rivera-Aguilar, Angel Miliar-García, Judith Pacheco-Yepez
The protozoan Entamoeba histolytica is the etiological agent of amoebiasis, which can spread to the liver and form amoebic liver abscesses. Histological studies conducted with resistant and susceptible models of amoebic liver abscesses (ALAs) have established that neutrophils are the first cells to contact invasive amoebae at the lesion site. Myeloperoxidase is the most abundant enzyme secreted by neutrophils. It uses hydrogen peroxide secreted by the same cells to oxidize chloride ions and produce hypochlorous acid, which is the most efficient microbicidal system of neutrophils...
2017: PloS One
https://www.readbyqxmd.com/read/28796341/silver-nano-materials-cause-genotoxicity-in-enchytraeus-crypticus-as-determined-by-the-comet-assay
#18
Vera L Maria, Maria João Ribeiro, Sofia Guilherme, Amadeu M V M Soares, Janeck J Scott-Fordsmand, Mónica J B Amorim
Enchytraeids have been used in standard ecotoxicity testing for about 20 years now. Since adopting the standard test for survival and reproduction, a number of additional tools have been developed, including transcriptomics and enzymatic biomarkers. So far, a genotoxicity tool and endpoint have not been used; hence, the goals of the current study included the optimization of the in vivo alkaline comet assay in Enchytraeus crypticus. Further, the effect of silver nanomaterial (Ag NM300K, dispersed, 15 nm) was tested and compared with AgNO3 ...
August 10, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28796234/electron-microscopy-using-the-genetically-encoded-apex2-tag-in-cultured-mammalian-cells
#19
Jeffrey D Martell, Thomas J Deerinck, Stephanie S Lam, Mark H Ellisman, Alice Y Ting
Electron microscopy (EM) is the premiere technique for high-resolution imaging of cellular ultrastructure. Unambiguous identification of specific proteins or cellular compartments in electron micrographs, however, remains challenging because of difficulties in delivering electron-dense contrast agents to specific subcellular targets within intact cells. We recently reported enhanced ascorbate peroxidase 2 (APEX2) as a broadly applicable genetic tag that generates EM contrast on a specific protein or subcellular compartment of interest...
September 2017: Nature Protocols
https://www.readbyqxmd.com/read/28795793/an-unprecedented-case-a-low-specific-surface-area-anatase-n-doped-carbon-nanocomposite-derived-from-a-new-single-source-precursor-affords-fast-and-stable-lithium-storage
#20
Man Gao, Kaixiang Zou, Yuanfu Deng, Zhenxia Zhao, Yingwei Li, Guohua Chen
A nanocomposite of ultra-fine anatase nanoparticles (< 5 nm) embedded N-doped carbon (TiO2-NPs/NC) with a relatively low specific surface area was successfully synthesized by in-situ pyrolysis of a new and cheap single source precursor of (H2en)3[Ti4(O2)4(Hcit)2(cit)2]∙12H2O (en = ethylenediamine and H4cit = citric acid) under 550 oC and inert atmosphere. The precursor in crystalline state was isolated from an aqueous solution containing of titanium butoxide, citric acid, hydrogen peroxide and ethylenediamine and was characterized...
August 10, 2017: ACS Applied Materials & Interfaces
keyword
keyword
37104
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"