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  • 8-oxodeoxyguanosine  (1)
  • Ant-plant interaction  (1)
  • 2020-2022
  • 1995-1999  (2)
  • 1940-1944
Collection
Keywords
Publisher
Years
  • 2020-2022
  • 1995-1999  (2)
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    (−)-Epigallocatechin gallate, a polyphenolic tea antioxidant, inhibits peroxynitritemediated formation of 8-oxodeoxyguanosine and 3-nitrotyrosine (1996)
    Springer
    Cellular and molecular life sciences 52 (1996), S. 922-926 
    Details
    ISSN: 1420-9071
    Keywords: Antioxidant ; epigallocatechin gallate ; tea polyphenols ; 3-nitrotyrosine ; 8-oxodeoxyguanosine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Reaction with peroxynitrite at pH 7.4 and 37°C was found to increase the 8-oxodeoxyguanosine levels in calf thymus DNA 35-38-fold. This oxidation of deoxyguanosine, as well as the peroxynitrite-mediated nitration of tyrosine to 3-nitrotyrosine, was significantly inhibited by ascorbic acid, glutathione and (−)-epigallocatechin gallate, a polyphenolic antioxidant present in tea. For 50% inhibition of the oxidation of deoxyguanosine to 8-oxodeoxyguanosine, 1.1, 7.6 of 0.25 mM ascorbate, glutathione or (−)-epigallocatechin gallate, respectively, was required. For 50% inhibition of tyrosine nitration, the respective concentrations were 1.4, 4.6 or 0.11 mM. Thus, (−)-epigallocatechin gallate is a significantly better inhibitor of both reactions than either ascorbate or glutathione. Reaction of (−)-epigallocatechin gallate with peroxynitrite alone resulted in the formation of a number of products. Ultraviolet spectra of two of these suggest that the tea polyphenol and/or its oxidation products are nitrated by peroxynitrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01938881
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution and abundance of plants with extrafloral nectaries in the woody flora of a lowland primary forest in Malaysia (1995)
    Springer
    Biodiversity and conservation 4 (1995), S. 165-182 
    Details
    ISSN: 1572-9710
    Keywords: Ant-plant interaction ; extrafloral nectaries ; Malaysia ; lowland rain forest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The first data on the taxonomic distribution and abundance of woody plants with extrafloral nectaries (EFN) from SE Asia are reported. The species richness and frequency of woody angiosperm plants with extrafloral nectaries was studied in the Pasoh Forest Reserve, a primary lowland forest in Peninsular Malaysia. EFN were present on 12.3% of the 741 species surveyed. 91 plant species belonging to 47 genera and 16 families were found to have EFN. Euphorbiaceae, Dipterocarpaceae, Rosaceae, Leguminosae, and Ebenaceae were the families most frequently bearing EFN whereas EFN were rare in the more primitive subclasses of the Magnoliopsida and common in the more advanced taxa (Dilleniidae, Rosidae, Asteridae). Most common were flattened glands associated with the leaf blade. A comparison with data from the Neotropics showed a great similarity in regard to the taxonomic distribution of plants with EFN. EFN-plants occupied 19.3% of the cover of the Pasoh Forest 50 ha plot. Species with EFN were under-represented among shrubs and trees of the understorey. We found an increase in the number of species with EFN as well as in their cover from the understorey to the canopy emergents. EFN were found more often among the abundant species (species with n〉500/50 ha). Percentage occurrence and cover of EFN-bearing plants in the 50 ha plot of primary forest was lower than recorded for secondary habitats in tropical areas. At present, in the core zone of the Pasoh Forest Reserve which has been investigated only few species known to indicate disturbance occur. Therefore most of the recorded EFN-species cannot be regarded as secondary forest plants. The interactions between ants and EFN-bearing plants appear to be rather facultative and nonspecific. In Pasoh we found 28 ant species from seven genera visiting EFN. Most of the EFN-associated ants belonged to the subfamily Myrmicinae while Ponerines were rare, a pattern which was also reported for the Neotropics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00137783
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