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  • 1
    Electronic Resource
    Electronic Resource
    Oxidative stress occurs during soybean nodule senescence (1999)
    Springer
    Planta 208 (1999), S. 73-79 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Antioxidant defence ; Free radical ; Glycine (nodule) ; Homoglutathione ; Nodule ; Senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Several markers of oxidative stress were measured in 2- to 10-week-old soybean (Glycine max [L.] Merr.) nodules. There were increases in peroxides, protein carbonyls and modified DNA base concentrations with nodule age. The catalytic iron content also increased significantly during nodule ageing. Iron contained in the peribacteroid space was effective in promoting lipid peroxidation and this might contribute to the degradation of the peribacteroid membrane in senescing nodules. The concentration of the oxidized forms of glutathione and homoglutathione increased significantly during nodule development and the concentration of reduced glutathione and homoglutathione decreased during senescence. Taken together, these results are consistent with the development of oxidative stress in senescing nodules. Significant DNA and protein damage also occurred in the first days of nodule development, suggesting that an earlier period of oxidative stress might occur in the period over which the symbiosis becomes established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050536
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    ‘Free’ iron, as detected by electron paramagnetic resonance spectroscopy, increases unequally in different tissues during dietary iron overload in the rat (1996)
    Springer
    BioMetals 9 (1996), S. 98-103 
    Details
    ISSN: 1572-8773
    Keywords: electron paramagnetic resonance spectroscopy ; free iron ; iron overload ; lipid peroxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract ‘Free’ iron concentration, as determined by electron paramagnetic resonance (EPR) spectroscopy, and lipid peroxidation (LPO), as determined by thiobarbituric acid test, were assessed in the lung, heart, liver, spleen, brain and kidney of rats subjected to experimental iron overload. Two tests, Desferal- and NO-available iron, were used to measure ‘free’ iron and gave comparable results. The most pronounced accumulation of ‘free’ iron was observed in liver, kidney and spleen. Differences between control and iron loaded animals increased during the initial 90 days of treatment. Between 90 and 180 days ‘free’ iron concentration reached a steady state level, or even decreased, as in the case of liver. Lipid peroxidation level, measured in the organs of both treated and matched controls, did not give any significant difference during the initial 90 days of treatment. A significant augmentation was observed in liver, kidney, spleen and heart at 180 days. The results of the present research show that, under conditions of moderate siderosis, the occurrence of LPO is partially related to the level of ‘free’ iron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188097
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    Paper (German National Licenses)
    Fulltext
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