Natural Oxidants
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Artemisia annua increases resistance to heat and oxidative stresses, but has no effect on lifespan in Caenorhabditis elegans
Abstract It is suggested that oxidative stress induced by cellular reactive oxygen species is one of the major causal factors of aging. The effect of dietary supplementation of anti-oxidants on response to environmental stressors and lifespan has been studied in various model organisms. In the present study, we examine the effect of Artemisia annua extract o
Food Sci. Technol. Publicado em: 31/05/2016
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2. Adaptação de equipamento de geração de gases oxidantes para aplicação na desinfecção de água / Adaptation of generator oxidant gases equipament to aplication in water disinfection
Human consumption of water outside of the microbiological standards for drinking constitutes a health and disease risk factor. Through the process of infiltration in the soil, groundwater may be contaminated by the waste generated by human activity and deposited in the soil, waterways or air. The consumption of water in natura, captured in a spring, may lead
Publicado em: 2009
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3. Análise de imagem em química analítica: empregando metodologias simples e didáticas para entender e prevenir o escurecimento de tecidos vegetais
A simple and didactic experiment was developed for image monitoring of the browning of fruit tissues caused by the enzyme polyphenol oxidase. The procedure, easy and inexpensive, is a valuable tool to teach and demonstrate the redox reaction between the enzyme and the natural polyphenols. To obtain the browning percentage for apple, pear and banana, digital
Química Nova. Publicado em: 2005-06
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4. Aquatic biogeochemistry of organic mercury in the Rio Negro Basin, Amazon / Biogeoquimica aquatica do mercurio organico na Bacia do Rio Negro, Amazonia
A dinâmica biogeoquímica do Hgorgânico nas águas da Bacia do Rio Negro foi investigada efetuando-se os seguintes estudos: (i) medidas das concentrações de Hgtotal, Hgreativo e Hgorgânico, em águas naturais, e de Hgtotal, Hgorgânico e metilHg em sedimentos, ambos provenientes de águas brancas e pretas; (ii) avaliação da labilidade e da fotooxidaç
Publicado em: 2005
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5. Response of Leishmania chagasi promastigotes to oxidant stress.
At the onset of infection, Leishmania promastigotes are phagocytized by mammalian macrophages. They must survive despite exposure to toxic oxidants such as hydrogen peroxide (H2O2) and superoxide (.O2-) generated during phagocytosis. We investigated the effects of these oxidants on Leishmania chagasi promastigotes and promastigote mechanisms for oxidant resi
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6. Rapid polyether cleavage via extracellular one-electron oxidation by a brown-rot basidiomycete
Fungi that cause brown rot of wood are essential biomass recyclers and also the principal agents of decay in wooden structures, but the extracellular mechanisms by which they degrade lignocellulose remain unknown. To test the hypothesis that brown-rot fungi use extracellular free radical oxidants as biodegradative tools, Gloeophyllum trabeum was examined for
The National Academy of Sciences.
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7. Mitochondrial Adaptations to NaCl. Complex I Is Protected by Anti-Oxidants and Small Heat Shock Proteins, Whereas Complex II Is Protected by Proline and Betaine1
High soil sodium (Na) is a common stress in natural and agricultural systems. Roots are usually the first tissues exposed to Na stress and Na stress-related impairment of mitochondrial function is likely to be particularly important in roots. However, neither the effects of NaCl on mitochondrial function, nor its protection by several potential adaptive mech
American Society of Plant Physiologists.
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8. Diatom Plastids Possess a Phosphoribulokinase with an Altered Regulation and No Oxidative Pentose Phosphate Pathway1
The chloroplast enzyme phosphoribulokinase (PRK; EC 2.7.1.19) is part of the Calvin cycle (reductive pentose phosphate pathway) responsible for CO2 fixation in photosynthetic organisms. In green algae and vascular plants, this enzyme is light regulated via reversible reduction by reduced thioredoxin. We have sequenced and characterized the gene of the PRK fr
American Society of Plant Biologists.
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9. Ubiquinol-10 protects human low density lipoprotein more efficiently against lipid peroxidation than does alpha-tocopherol.
The temporal disappearance of natural antioxidants associated with human low density lipoprotein (LDL) in relation to the appearance of various classes of lipid hydroperoxides was investigated under three types of oxidizing conditions. Freshly isolated LDL from plasma of healthy subjects was free of detectable amounts of lipid hydroperoxides as measured by H
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10. Cold-hardiness-specific glutathione reductase isozymes in red spruce. Thermal dependence of kinetic parameters and possible regulatory mechanisms.
The thermal dependence of kinetic parameters has been determined in purified or partially purified preparations of cold-hardiness-specific glutathione reductase isozymes from red spruce (Picea rubens Sarg.) needles to investigate a possible functional adaptation of these isozymes to environmental temperature. We have previously purified glutathione reductase