• oxidative stress
  • Antioxidant Oxidative stress Peroxidases Noctor G, Foyer CH (Jun 1998). (wikipedia.org)
  • Despite a significant increase in the H2O2 content in both As20 and As30 plants, the former, unlike As30 plants, did not experience any type of As-induced oxidative stress (membrane lipid peroxidation, electrolyte leakage). (deepdyve.com)
  • By contrast, soil amendment with phosphorus (200 mg P/kg) at As30 prevented As-induced oxidative stress through the reduction of the H2O2 level even below As0. (deepdyve.com)
  • 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)
  • sodium
  • Ascorbate salts such as sodium ascorbate and calcium ascorbate are used in some dietary supplements. (wikipedia.org)
  • Using a polyclonal antibody (Ab)-based immunoaffinity column, oxytocin biosynthesis was monitored in Leydig cells incubated with a mildly stimulating dose (0.1 ng/ml) of ovine LH for 24, 48 and 72 hours in the presence of increasing concentrations of sodium ascorbate (1- 500 mM) under culture conditions of hypoxia and normoxia. (biology-online.org)
  • Hypoxic culture conditions and low (1-10 mM) concentrations of sodium ascorbate augmented the production of oxytocin from Leydig cells in culture. (biology-online.org)
  • Mixtures of mineral ascorbates (calcium, magnesium, potassium, zinc, and sometimes sodium) are used in certain circumstances to increase bowel tolerance for even more clinical effectiveness but do not clearly demonstrate the increasing bowel tolerance phenomenon being discussed here. (eco-supplements.com)
  • cultivars
  • Kadioglu, A. 2011-01-08 00:00:00 Effects of the antioxidant system and chlorophyll fluorescence on drought tolerance of four common bean (Phaseolus vulgaris L.) cultivars were studied. (deepdyve.com)
  • free radical
  • Clinically, in a disease ameliorated by ascorbate, there is a suppression of symptoms only with very high doses and approximately to that extent which a nonrate-limited, antioxidant free radical scavenger , might be expected to affect that disease process if all harmful free radicals and highly reactive oxidizing substances were quenched. (eco-supplements.com)
  • In most pathologic processes, the rate at which free radicals and highly reactive oxidants are produced, exceeds the rate at which the ordinary rate-limited antioxidant free radical scavenging mechanisms can quench those free radicals and oxidants. (eco-supplements.com)
  • Senescence
  • Thus, exogenous Put supply could maintain membrane integrity by increasing antioxidant system activity, thereby retarding the senescence of cut lisianthus flower during vase life. (ac.ir)
  • Decline in ascorbate peroxidase activity a prerequisite factor for tepal senescence in Gladiolus. (ac.ir)
  • activity
  • Normal to high levels of leaf APX, CAT, and redox pool of ascorbate effectively balanced the elevated SOD activity at As20, maintaining the H2O2 concentration higher than control but obviously in favor of As20 plant growth. (deepdyve.com)
  • When plants and cultured cells were treated with 2 mM proline and than with H2O2, the number of dead cells in suspension was 35%, the content of MDA was decreased, APO was activated, and SOD activity was decreased in both cell culture and plant leaves. (deepdyve.com)
  • peroxidase " activity in an enzyme called cyclooxygenase. (wordnik.com)
  • tolerant
  • Low or moderate doses (doses substantially below bowel tolerance) usually had no noticeable immediate beneficial effects, but high doses (doses just below the amount that would produce diarrhea in a patient tolerant to ascorbate) would have the effect of markedly suppressing symptoms as the high dose levels were reached. (eco-supplements.com)
  • concentrations
  • Since luteinizing hormone (LH) and ascorbate are known to augment the production of oxytocin in ovarian granulose cells, varying concentrations of these two stimulants were used to monitor the biosynthesis of oxytocin from isolated Leydig cells in culture. (biology-online.org)
  • oxygen
  • Leydig cells maintained in an atmosphere composed of 19% oxygen produced H2O2 at a faster rate than similar cells incubated at 3% oxygen. (biology-online.org)
  • mechanisms
  • 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)
  • levels
  • Higher (50-500 mM) levels of ascorbate and normoxic culture conditions suppressed both testosterone and oxytocin production in isolated Leydig cells. (biology-online.org)
  • The mRNA of heat shock protein (HSP) genes, exemplified by Hsp17.6, Hsp18.2, and the two cytosolic ascorbate peroxidase genes Apx1, Apx2, reached similar levels by moderate heat stress (37°C) or by treatment with H2O2, butylperoxide and diamide at room temperature. (deepdyve.com)
  • high
  • 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)
  • Since even at very high doses, ascorbate is virtually nontoxic, it may be given in the enormous doses necessary to quench almost all unwanted free radicals and oxidants. (eco-supplements.com)
  • properties
  • In this study, the antioxidant properties (ABTS and DPPH scavenging capacities) and global polyphenolic composition of a new functional product, namely a pomegranate vinegar produced in the laboratory from the Gabsi variety, were evaluated and compared with those of commercial wine vinegars (Sherry and Rioja red wine Spanish vinegars). (readbyqxmd.com)
  • evidence of its antioxidant properties. (deepdyve.com)
  • complex
  • H2O2 was unable to induce this complex suggesting that H2O2 is involved only in the early stages of HSF activation. (deepdyve.com)