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| Registros recuperados: 66 | |
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| Peroni,Luis Antonio; Ferreira,Renato Rodrigues; Figueira,Antonio; Machado,Marcos Antonio; Stach-Machado,Dagmar Ruth. |
| Plants not only evolve but also reduce oxygen in photosynthesis. An inevitable consequence of this normal process is the production of reactive oxygen species (ROS). Plants are adequately protected by the presence of multiple antioxidative enzymes in the cytosol and also in the different cell organelles such as chloroplasts, mitochondria, and peroxisomes. Traditionally, ROS were considered to be only a toxic byproduct of aerobic metabolism. However, recently it has become apparent that plants actively produce these molecules which may control many different physiological processes such as abiotic and biotic stress response, pathogen defense and systemic signaling. The search results using the Citrus Genome Program in Brazil (CitEST) for oxidative stress... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Genome; EST; Reactive oxygen species; Oxidative stress enzyme. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500016 |
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| Miranda-Vilela,Ana L.; Resck,Inês S.; Grisolia,Cesar K.. |
| The daily consumption of natural antioxidants protects against oxidative damage caused by reactive oxygen species (ROS), including DNA damage, and can reduce the risk of cancer, atherosclerosis and other degenerative diseases. The pulp of pequi (Caryocar brasiliense Camb.) fruit, a tree native to the Brazilian savannah, contains several compounds with antioxidant properties, including carotenoids, vitamin C, phenolic compounds such as flavonoids, saponins and tannins, and essential oils. In this work, we examined the ability of organic and aqueous extracts of pequi fruit pulp to protect against the genotoxicity induced by two antineoplastic drugs, cyclophosphamide (CP) and bleomycin (BLM). Micronucleus tests with mouse bone marrow cells and single-cell gel... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antigenotoxic; Antioxidant; Caryocar brasiliense; Comet assay; Micronucleus; Pequi pulp extracts; Reactive oxygen species; TBARS assay. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500025 |
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| Caverzan,Andréia; Passaia,Gisele; Rosa,Silvia Barcellos; Ribeiro,Carolina Werner; Lazzarotto,Fernanda; Margis-Pinheiro,Márcia. |
| When plants are exposed to stressful environmental conditions, the production of Reactive Oxygen Species (ROS) increases and can cause significant damage to the cells. Antioxidant defenses, which can detoxify ROS, are present in plants. A major hydrogen peroxide detoxifying system in plant cells is the ascorbate-glutathione cycle, in which, ascorbate peroxidase (APX) enzymes play a key role catalyzing the conversion of H2O2 into H2O, using ascorbate as a specific electron donor. Different APX isoforms are present in distinct subcellular compartments, such as chloroplasts, mitochondria, peroxisome, and cytosol. The expression of APX genes is regulated in response to biotic and abiotic stresses as well as during plant development. The APX responses are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ascorbate peroxidase; Antioxidant system; Reactive oxygen species; Abiotic stress; Mutant plants. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600016 |
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| Salin, Karine; Auer, Sonya K.; Rey, Benjamin; Selman, Colin; Metcalfe, Neil B.. |
| It is often assumed that an animal's metabolic rate can be estimated through measuring the whole-organism oxygen consumption rate. However, oxygen consumption alone is unlikely to be a sufficient marker of energy metabolism in many situations. This is due to the inherent variability in the link between oxidation and phosphorylation; that is, the amount of adenosine triphosphate (ATP) generated per molecule of oxygen consumed by mitochondria (P/O ratio). In this article, we describe how the P/O ratio can vary within and among individuals, and in response to a number of environmental parameters, including diet and temperature. As the P/O ratio affects the efficiency of cellular energy production, its variability may have significant consequences for animal... |
| Tipo: Text |
Palavras-chave: Mitochondrial coupling efficiency; Life history; Oxidative stress; Reactive oxygen species; Trade-off; Uncoupling. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00414/52509/53322.pdf |
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| Han, Kyu-Ho; Hashimoto, Naoto; Fukushima, Michihiro. |
| Excessive consumption of alcoholic beverages is a serious cause of liver disease worldwide. The meta-bolism of ethanol generates reactive oxygen species, which play a significant role in the deterioration of alcoholic liver disease (ALD). Antioxidant phytochemicals, such as polyphenols, regulate the expression of ALD-associated proteins and peptides, namely, catalase, superoxide dismutase, glutathione, glutathione peroxidase, and glutathione reductase. These plant antioxidants have electrophilic activity and may induce antioxidant enzymes via the Kelchlike ECH-associated protein 1-NF-E2-related factor-2 pathway and antioxidant responsive elements. Furthermore, these antioxidants are reported to alleviate cell injury caused by oxidants or inflammatory... |
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Palavras-chave: Electrophile; Mitogen-activating protein kinase; Plant antioxidants; Reactive oxygen species; Preconditioning. |
| Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4425 |
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| WANG,Y.; YU,J.; ZHOU,B.; SAPKOTA,S.; WEI,F.; WANG,Z.. |
| ABSTRACT: The effect of atrazine, mesotrione, and joint activity of atrazine plus mesotrione on pigment, lipid peroxidation, and antioxidant enzyme activity was studied. Atrazine and mesotrione treatments significantly reduced chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoid concentrations, and protein content in bermudagrass (Cynodon dactylon L.) plants, whereas they significantly enhanced lipid peroxidation. The treatment of atrazine plus mesotrione caused greater phototoxic effect on bermudagrass than either herbicide alone, which was evident from the significantly decreased membrane stability noted as a function of the enhanced singlet oxygen and malondialdehyde (MDA) contents, as well as from the greater reduction in Chl a, Chl b, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant; Carotenoids; Herbicide; Reactive oxygen species. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100337 |
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| FIPKE,M.V.; VIDAL,R.A.. |
| ABSTRACT Quinclorac is a systemic herbicide absorbed by germinating seeds, roots and leaves of seedlings. It is a selective compound for crops such as rice, canola, barley, corn, sorghum, and pasture. Quinclorac can be used to control various monocots and dicotyledonous weed species. The biochemical function of this herbicide in the plant has intrigued scientists for nearly four decades. The objectives of this review are to present evidence of three hypotheses on the biochemical functioning of quinclorac and to propose an integrative mode of action. The first theory on the mode of action of quinclorac is supported by evidence of inhibition of incorporation of C14-glucose into cellulose and hemicellulose, thus, affecting the cell wall synthesis. The second... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cellulose biosynthesis-inhibitor; Cyanide; Auxinic herbicide; Reactive oxygen species. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200393 |
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| XUE-FENG,Z.; JUN,L.V.; SHAHID,M.; ANJUM,S.A.; NA-JIA,L.; XIU-JUAN,H.; YU,X.; XIAO,W.; SAN-GEN,W.. |
| ABSTRACT: Abiotic stresses and poor biomass accumulation are chief constraints to accomplish potential yield in Leymus chinensis. An experiment was conducted to improve biomass and correlation of biomass accumulating attributes with photosynthetic pigments, osmotic substances and antioxidants under foliar application of different plant growth substances. The experiment was conducted at inner Mongolia Xilinguole, China, using a Randomized Complete Block Design and 5 replications. The treatments consisted of water (control); BA5 = application of BA (6-benzylaminopurine) at 5 mg L-1; BA25 = application of BA at 25 mg L-1; BA50 = application of BA at 50 mg L-1; BR0.02 = application of BR (brassinosteroid) at 0.02 g L-1; BR0.2 = application of BR at 0.2 mg L 1;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Reactive oxygen species; Phytoregulators. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100256 |
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| Silva,C.B.; Simionatto,E.; Gebara,S.S.; Poppi,N.R.; Cândido,A.C.S.; Lima,C.P.; Dias,J.F.G.; Zanin,S.M.W.; Peres,M.T.L.P.; Moreira,T.F.; Miguel,O.G.; Miguel,M.D.. |
| The volatile oils extracted from the roots of Polygala extraaxillaris were analyzed to assess whether they increase oxidative stress in Brachiaria decumbens var. Piatã, as well as to assess their effect on cellular division and cytotoxicity in laboratory. Six concentrations were used (0%, 0.35%, 0.65%, 1.25%, 0.65%, and 5.0%) with four repetitions of 25 seeds. The substance 1-(2-hydroxyphenyl) - ethanone was identified as the major constituent of the volatile oils. The results showed that the highest concentrations of the oils resulted in an increase in the oxidative stress in B. decumbens, as well as alteration in germination and growth, with a consequent reduction in the process of cellular division, causing changes in the growth standard and antioxidant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reactive oxygen species; Antioxidant enzymes; Plant defense; Signal grass. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400005 |
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| FRAGA,D.S.; AGOSTINETTO,D.; LANGARO,A.C.; OLIVEIRA,C.; ULGUIM,A.R.; SILVA,J.D.G.. |
| ABSTRACT: The appearance of soybean cultivars that are tolerant to herbicides from the imidazolinone group enables irrigated rice rotation conducted on Clearfield® system. The objective of this work was to evaluate the morphological and metabolic changes of soybean cultivars containing Cultivance® (CV), which is tolerant to imidazolinone, sulphonylurea toletant (STS) and Roundup Ready® (RR), which is tolerant to glyphosate as affected by carryover of increasing doses of imazapyr and imazapic herbicides mixture, applied in the management of irrigated rice crop. Thus, experiments were conducted on the field and in greenhouse, evaluating phytotoxicity, height, leaf area, shoot dry matter, as well as variables related to the secondary metabolism of plants like... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Imidazolinones; Glicine max; Reactive oxygen species. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100211 |
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| Zimmermann,CEP; Machado,AK; Cadoná,FC; Jaques,JAS; Schlemmer,KB; Lautert,C; Cruz,IBM; Zanette,RA; Leal,DBR; Santurio,JM. |
| The aim of the present work was to study the in-vitro cytotoxic effects of different concentrations of aflatoxin B1 (AFB1) on broiler lymphocytes. Lymphocyte-rich mononuclear cells were separated by Ficoll-Histopaque density and cultured in 96-wellplates containing the evaluated AFB1 concentrations in 5% CO2 atmosphere at 39°C. Thereafter, MTT, PicoGreen, and reactive oxygen species assays were performed. Cell viability decreased in the presence of 10 µg/mL AFB1 at 48 h (p < 0.05) and of 10 and 20 µg/mL AFB1 at 72 h (p < 0.01 and p < 0.001, respectively) when compared to the control (0 µg/mL). However, a dose-dependent increase in the cell-free DNA at 24 h was observed at 1, 10 and 20 µg/mL (p < 0.001). ROS formation significantly increased at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aflatoxin B1; Broilers; Lymphocytes; PicoGreen; Reactive oxygen species. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000300012 |
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| Langaro,Ana Claudia; Agostinetto,Dirceu; Ruchel,Queli; Garcia,Jessica Rodrigues; Perboni,Lais Tessari. |
| ABSTRACT Among the methods of weed control, stands out chemical control. However, even selective, herbicides can trigger the production of reactive species of oxygen and cause oxidative stress. The aim of the study was to evaluate changes in photosynthetic parameters, oxidative damage, antioxidant enzyme activity and altered metabolism of rice plants after applying pre-emergent herbicides. The experiment was conducted in a greenhouse and herbicides used were oxadiazon, pendimethalin and oxyfluorfen, beyond the control without herbicide. There was a reduction of photosynthetic rate and efficiency of carboxylation, compared to the control, when applied herbicides oxyfluorfen and pendimethalin. The major lipid peroxidation and proline accumulation was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant system; Chemical control; Reactive oxygen species; Selectivity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000200358 |
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| Ferreira,Leonardo Cesar; Cataneo,Ana Catarina. |
| Several studies were carried out in order to improve the knowledge about the occurrence and activity of nitric oxide (NO) in plants. Thus, this review discusses some aspects related to NO in plants such as chemical properties, synthesis pathways, physiological effects, antioxidant action, signal transduction, interaction with plant hormones and gene expression. In the last years, many advances have been obtained regarding NO synthesis and its physiological effects in plants. However, the molecular mechanisms underlying its effects remain poorly understood. It is signalized that tight interplays among NO, Ca2+, cyclic ADP ribose (cADPR), and protein kinases need to be investigated in details. In addition, it has not yet been possible to identify a plant... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Pathogenesis; Plant hormones; Plant signal transduction; Reactive oxygen species. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200017 |
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| Ribeiro, Vandjore de Mattos; Spiassi, Ariane; Marcon, Thaís Regina; Lima, Gislaine Piccolo de; Corsato, Jaqueline Malagutti; Fortes, Andréa Maria Teixeira. |
| This study aimed to analyze oxidative stress produced in cucumber seeds and seedlings when exposed to aqueous extract from dried leaves of leucaena, as well as its effect on the germination behavior, early growth and the antioxidant enzymes activity. It was evaluated the percentage, the speed index, the average time, the frequency and germination synchronization, the root length and shoot, as well as the catalase and peroxidase enzymes activity. There was no significant inhibitory effect of the leaf extracts on the germination percentage. However, there was delay in the seeds germination, as the extract proportion increased. A stimulatory effect of the extract compared to the shoot length was observed, however the root growth was significantly reduced.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Botânica allelopathy; Reactive oxygen species; Antioxidant enzymes. Fisiologia Vegetal. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34801 |
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| YU,YING; JIANG,HAIFENG; NIU,YANGYANG; ZHANG,XIAOQIN; ZHANG,YINGYING; LIU,XI; QI,TAO; YU,CHEN. |
| Abstract: Besides stimulating vasoconstriction, Angiotensin II is also well known in inducing reactive oxygen species and promoting inflammatory phenotype switch via its type 1 receptor. In clinic, Angiotensin II type 1 (AT1) receptor blocker like candesartan has been widely applied as an antihypertensive medication. We previous have demonstrated that a higher dose of candesartan plays a protective role after kidney injury. However, whether candesartan could exhibit anti-inflammatory effects remains unclear. Here, by stimulating isolated human embryonic kidney epithelial cells with tumor necrosis factor-α (TNF-α), we observed the anti-inflammation capacity of candesartan ex vivo. It was found that pre-treat with candesartan significantly suppressed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Angiotensin II type 1 receptor blockers; Candesartan; Inflammation; Reactive oxygen species. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300701 |
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| Registros recuperados: 66 | |
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