• superoxide
  • In marine systems, superoxide most often acts as a one-electron reductant, but it can also serve as an oxidant and may increase the normally slow oxidation rates of environmental compounds. (wikipedia.org)
  • The measurement of the MDA, chlorophyll, carotenoids contents and activity of antioxidant enzymes revealed that gamma-ray and cosmic-ray, but not ion beam, ionization deceased chlorophyll and carotenoids contents, while all three ionization treatments increased the activities of peroxidase, ascorbate peroxidase, and superoxide dismutase compared with the non-irradiated plants. (scoop.it)
  • oxidative stress
  • The central question of this paper is whether in plant cells oxidative stress, in particular H2O2, is required for heat stress- and heat shock factor (HSF)-dependent expression of genes. (deepdyve.com)
  • Rapid (15 min) formation of heat shock promoter element (HSE) protein-binding complex of high molecular weight in extracts of heat-stressed or H2O2-treated cells and the inability to form this complex after ascorbate treatment suggests that oxidative stress affects gene expression via HSF activation and conversely, that H2O2 is involved in HSF activation during the early phase of heat stress. (deepdyve.com)
  • compounds
  • industrial chemicals that are added to products to prevent oxidation, and naturally occurring compounds that are present in foods and tissue . (wikipedia.org)
  • cell
  • Peroxiredoxins are proposed to play a role in cell signaling by regulating H2O2 levels. (wikipedia.org)
  • complex
  • The heat stress induction of a high mobility HSE-binding complex, characteristic for later phase of heat shock response, was blocked by ascorbate and DPI. (deepdyve.com)
  • H2O2 was unable to induce this complex suggesting that H2O2 is involved only in the early stages of HSF activation. (deepdyve.com)
  • presence
  • The heat-induced expression levels were significantly reduced in the presence of ascorbate or DPI indicating that H2O2 is an essential component in the heat stress signalling pathway. (deepdyve.com)
  • Significant induction of the genes tested after diamid treatment and moderate expression of the sHSP genes in the presence of 50 mM ascorbate at 37°C occurred without activation of HSF, indicating that other mechanisms may be involved in stress signalling. (deepdyve.com)