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| Registros recuperados: 36 | |
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| Asad,Nasser Ribeiro; Asad,Lidia Maria Buarque Oliveira; Almeida,Carlos Eduardo Bonacossa de; Felzenszwalb,Israel; Cabral-Neto,Januário Bispo; Leitão,Alvaro Costa. |
| Hydrogen peroxide is an important reactive oxygen species (ROS) that arises either during the aerobic respiration process or as a by-product of water radiolysis after exposure to ionizing radiation. The reaction of hydrogen peroxide with transition metals imposes on cells an oxidative stress condition that can result in damage to cell components such as proteins, lipids and principally to DNA, leading to mutagenesis and cell death. Escherichia coli cells are able to deal with these adverse events via DNA repair mechanisms, which enable them to recover their genome integrity. These include base excision repair (BER), nucleotide excision repair (NER) and recombinational repair. Other important defense mechanisms present in Escherichia coli are OxyR and SosRS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrogen peroxide; Cross-adaptive response; Lethal synergism; Copper and iron. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200026 |
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| Wong, Gtf; Dunstan, Wm; Kim, Db. |
| All nine species of marine phytoplankton tested (a cyanobacterium: Synechococcus sp., three diatoms: Chaetoceros simplex, Thalassiosira oceanica and Skeletonema costatum, two prymnesiophytes: Pleurochrysis carterae and Isochrysis galbana, a prasinophyte: Tetraselmis sp., a green alga: Dunaliella tertiolecta, and a dinoflagellate: Amphidinium carterae) were able to decompose hydrogen peroxide in the dark. Since these phytoplankton species can be found widely in a variety of marine sub-environments, this indicates that the dark decomposition of hydrogen peroxide by phytoplankton is a general phenomenon in the oceans. The decomposition rates were first order with respect to the concentration of hydrogen peroxide and biomass. The second-order rate constants... |
| Tipo: Text |
Palavras-chave: Phytoplancton marin; Peroxyde d'hydrogène; Oxydo-réduction; Marine phytoplankton; Hydrogen peroxide; Oxidation-reduction. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00322/43276/43007.pdf |
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| Perez Garcia, Maria Concepcion; Rouxel, Julien; Akcha, Farida. |
| In this work, the DNA-damaging effect of hydrogen peroxide on the structural integrity of nucleolar organizer regions (NORs) was studied for the first time by comet-FISH in the Pacific oyster Crassostrea gigas. Global DNA damage was assessed in hemocytes using an alkaline version of the comet assay. Next, NOR sensitivity was analysed by mapping major rDNA repeat unit by fluorescence in situ hybridisation (FISH) on the same comet slides. Exposure of hemocytes to 100 μM of hydrogen peroxide induced a significant increase in both DNA damage and number of FISH-signals of major ribosomal genes versus the control. Moreover, a significant positive correlation was shown between DNA damage as measured by the comet assay (percentage of DNA in comet tail) and the... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Hydrogen peroxide; Comet assay; Comet-FISH; Genotoxicity. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00250/36157/34712.pdf |
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| Begrem, Simon; Ivaniuk, Flora; Gigout Chevalier, Frederique; Kolypczuk, Laetitia; Bonnetot, Sandrine; Leroi, Francoise; Grovel, Olivier; Delbarre-ladrat, Christine; Passerini, Delphine. |
| Carnobacterium maltaromaticum and Carnobacterium divergens, isolated from food products, are lactic acid bacteria known to produce active and efficient bacteriocins. Other species, particularly those originating from marine sources, are less studied. The aim of the study is to select promising strains with antimicrobial potential by combining genomic and phenotypic approaches on large datasets comprising 12 Carnobacterium species. The biosynthetic gene cluster (BGCs) diversity of 39 publicly available Carnobacterium spp. genomes revealed 67 BGCs, distributed according to the species and ecological niches. From zero to six BGCs were predicted per strain and classified into four classes: terpene, NRPS (non-ribosomal peptide synthetase), NRPS-PKS (hybrid... |
| Tipo: Text |
Palavras-chave: Lactic acid bacteria; Antimicrobial activity; Carnobacteriumspp; Hydrogen peroxide; Bacteriocin; RiPP; NRPS; Terpene; Natural product; Genome mining. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75335/75999.pdf |
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| ORSI,R.O.; FUNARI,S.R.C.; SOARES,A.M.V.C.; CALVI,S.A.; OLIVEIRA,S.L.; SFORCIN,J.M.; BANKOVA,V.. |
| Propolis has been the subject of several recent studies, with the aim of elucidating its biological and pharmacological properties. Propolis has a well-known antimicrobial activity as well as antioxidant, antitumoral, antiinflammatory, and regenerative properties, but literature about its effects on the immune response is scarce. The goal of this work was to evaluate the propolis effect on macrophage activation by oxygen (H2O2) and nitrogen (NO) metabolite determination. Propolis was produced by africanized honeybees and hydroalcoholic solutions were prepared at different concentrations. Peritoneal macrophages were obtained from male BALB/c mice and culture cells were stimulated in vitro with propolis or interferon-gamma (IFN-gamma). In the in vivo assay,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Propolis; Macrophages; Hydrogen peroxide; Nitric oxide. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302000000200006 |
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| Treasurer, James W.; Grant, Andrew; Davis, Paul J.. |
| Licensed medicines available in the U.K. for treating Atlantic salmon infested with sea lice, dichlorvos, azamethiphos, and hydrogen peroxide, can only be administered by bath application. Adverse reactions have been reported to bath treatments including mortalities, inappetance, reduction in growth and reduced louse sensitivity to dichlorvos. The physical constraints of bath treatments are examined and improvements recommended. Oxygen saturation was adequate during treatments but declined rapidly when the tarpaulin was removed. A chemical marker dispersed uniformally both horizontally and vertically in a cage within 5 mins of dispensing indicating dispersal of a medicine is rapid and adequate during treatment. The range in enclosed volumes in 86... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Sea lice; Atlantic salmon; Salar; Bath application; Dichlorvos; Hydrogen peroxide. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534338 |
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| Camargo,María Antonia Martínez; Coronado,Ana Cruz Morillo; Mora,Edilberto Cepeda; Fernández,Sandra Yaneth Mesa. |
| Abstract The genus Passiflora, commonly known as fruits of passion, includes numerous species, including gulupa (Passiflora edulis f. edulis), of nutracetic and economic importance, both for consumption in nature and for its agro-industrial applicability. This research was developed to evaluate the effects of various pre-germinative treatments on the germination of gulupa seeds from the municipality of Ramiriquí (Boyacá), such as: exposure to hydrogen peroxide (H2O2), hypochlorite of sodium (NaOCl), gibberellic acid (GA3), distilled water imbibition and stratification at 4 °C, in varying concentrations and exposure times (24 and 48 hours), using an experimental design completely random, with three repetitions of 50 seed each one. Statistical analysis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Passiflora; Gulupa; Germination; Hydrogen peroxide; Gibberellic acid; Sodium hypochlorite. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000302003 |
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| Silveira, Márcio José da; UEM; Teixeira, Gustavo Monteiro; UNESP/Botucatu; Oliveira, Edson Fontes de; UEM. |
| Laboratórios de Zoologia em Instituições de Pesquisa e Ensino têm demonstrado grande demanda por peças anatômicas para utilização em aulas práticas. No entanto, embora a bibliografia voltada para este tema não seja escassa, são raras as análises das relações custo/benefício de tais processos levando em consideração aspectos técnicos, como tempo de preparo, qualidade das peças e recursos materiais e humanos. Além de técnicas usualmente utilizadas, novos produtos de baixo custo, não-citados na literatura e encontrados facilmente no mercado, também foram testados. O principal objetivo deste trabalho foi a elaboração e organização de informações sobre técnicas alternativas de maceração de peças ósseas para coleções didáticas, realizando análises comparativas... |
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Palavras-chave: Maceração; Clarificação de esqueletos; Peróxido de hidrogênio; Suco de mamão maceration; Skeleton clarification; Hydrogen peroxide; Papaya juice. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5876 |
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| Yoon,Jung Mi; Koppula,Sushruta; Huh,Se Jong; Hur,Sun Jin; Kim,Chan Gil. |
| BACKGROUND: Doxycycline (DC) has been shown to possess non-antibiotic properties including Fas/Fas Ligand (FasL)-mediated apoptosis against several tumor types in the concentration range of 10-40 μg/mL. However, the effect of DC in apoptotic signaling at much low concentrations was not studied. METHODS: The present study investigated the attenuation effect of low dose of DC on FasL-induced apoptosis in HeLa cell by the methods of MTT assay, fluorescence microscopy, DNA fragmentation, flow cytometry analysis, and western blotting. RESULTS AND CONCLUSION: In the present findings we showed that low concentration of DC (<2.0 μg/mL) exhibited protective effects against FasL-induced apoptosis in HeLa cells. FasL treatment to HeLa cells... |
| Tipo: Journal article |
Palavras-chave: Apoptosis; Caspase; Cisplatin; FasL; Hydrogen peroxide; Tetracycline. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100038 |
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| Matsuguma,Luciana Shizue; Lacerda,Luiz Gustavo; Schnitzler,Egon; Carvalho Filho,Marco Aurélio da Silva; Franco,Célia Maria Landi; Demiate,Ivo Mottin. |
| Two commercial varieties of Peruvian carrot ('Amarela de Carandaí' and 'Senador Amaral') were processed into flour, starch and bagasse and chemically evaluated. The starch was extracted, modified with H2O2 and characterized by the physicochemical methods. By using the methylene blue dyeing, the granules of the modified starches showed intense blue color. The carboxyl content, the reducing power and the amount of the water liberated from the pastes after the freeze-thawing were higher for the oxidized starches and their pastes were clearer than those of the native starches of the two varieties from the two production areas. The RVA viscoamylography showed that the modified starches had lower viscosities with differences between the varieties. In the thermal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peruvian carrot varieties; Starch; Hydrogen peroxide; Technological properties. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300022 |
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| Arruda,Maria Sueli Parreira de; Correa,Mara Adriana; Venturini,James; Félix,Maira Camila; Rosis,Ana Maria Bormio De; Galhiane,Mário Sérgio; Chierice,Gilberto Orivaldo; Costa,Maria Renata Sales Nogueira. |
| The aim of the present study was to examine the effect of a diet rich in synthetic PEtn on the metabolism macrophages of tumor-bearing mice. The results demonstrated that PEtn increased the animals' survival time. In addition, the treated animals released smaller amounts of hydrogen peroxide (H2O2) and nitric oxide (NO) than the non-treated animals, particularly after day 14. From the results it could be concluded that H2O2 and NO were important in the modulation of neoplastic growth, and pointed to a promising role of PEtn in the control of human neoplasms. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphoethanolamine; Ehrlich tumor; Nitric oxide; Hydrogen peroxide; Lipids. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000600016 |
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| Estivallet,Hidê Virgínia; Rodrigues,Maria Inês; Marroni,Norma Possa. |
| This work investigated the frog gastric mucosa response to hydrogen peroxide and ethanol induced injury. Acid and mucus secretion were estimated "in vitro" in control animals with intragastric absolute ethanol (1ml/30min. or 2ml/60min.) and hydrogen peroxide. The gastric mucosa morphological conditions were assessed "in vivo", concerning lesion area, pH and mucus. Ethanol (1ml/30min.) was observed to cause hyperemia, cell damage, rupture, edema, erosions, necrosis in gastric mucosa and significant increase in acid secretion. Absolute ethanol (2ml/60min.) caused a decrease in acid secretion due to alcalinization and an increase of mucus and pH. Intragastric hydrogem peroxide provoked gastric unwrinkling and hyperemia, acid secretions were not increased,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gastric acid secretion; Mucus; Ethanol; Hydrogen peroxide; Frog. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100007 |
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| Silveira,E.M.S.; Kroth,A.; Santos,M.C.Q.; Silva,T.C.B.; Silveira,D.; Riffel,A.P.K.; Scheid,T.; Trapp,M.; Partata,W.A.. |
| The present study aimed to analyze age-related changes to motor coordination, balance, spinal cord oxidative biomarkers in 3-, 6-, 18-, 24-, and 30-month-old rats. The effects of low-intensity exercise on these parameters were also analyzed in 6-, 18-, and 24-month-old rats. Body weight, blood glucose, total cholesterol, and high-density lipoprotein (HDL) cholesterol were assessed for all rats. The soleus muscle weight/body weight ratio was used to estimate skeletal muscle mass loss. Body weight increased until 24 months; only 30-month-old rats exhibited decreased blood glucose and increased total cholesterol and HDL cholesterol. The soleus muscle weight/body weight ratio increased until 18 months, followed by a small decrease in old rats. Exercise did not... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Superoxide anion generation; Hydrogen peroxide; Total thiol content; Lipid hydroperoxide levels; Total antioxidant capacity; Superoxide dismutase. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000700608 |
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| Registros recuperados: 36 | |
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