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  • 1985-1989  (2)
  • Utility rights-of-way  (1)
  • 226Ra
  • Nuclear magnetic resonance
  • business ethics
  • calcium
  • 1
    Electronic Resource
    Electronic Resource
    Effects of power-line construction on wetland vegetation in Massachusetts, USA (1989)
    Springer
    Environmental management 13 (1989), S. 477-483 
    Details
    ISSN: 1432-1009
    Keywords: Wetlands ; Utility rights-of-way ; Vegetation-Environmental impact assessment ; Eastern Massachusetts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Utility rights-of-way corridors through wetland areas generate long-term impacts from construction activities to these valuable ecosystems. Changes to and recovery of the vegetation communities of a cattail marsh, wooded swamp, and shrub/bog wetland were documented through measurements made each growing season for two years prior, five years following, and again on the tenth year after construction of a 345-kV transmission line. While both the cattail marsh and wooded swamp recovered within a few years, measures of plant community composition in the shrub/bog wetland were still lower, compared to controls, after ten years. Long-term investigations such as the one reported here help decrease uncertainty and provide valuable information for future decision making regarding construction of power utility lines through valuable and dwindling wetland resources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01867681
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An experimental study of the uptake and loss of Ra-226 by the tissue of the tropical freshwater musselVelesunio angasi (Sowerby) under varying Ca and Mg water concentrations (1986)
    Springer
    Hydrobiologia 139 (1986), S. 59-80 
    Details
    ISSN: 1573-5117
    Keywords: Radium-226 ; uptake ; mussel ; calcium ; magnesium ; metabolic analogue ; competitive inhibition ; uranium ; mining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Freshwater musselsVelesunio angasi (Sowerby) from Magela Creek, Alligator Rivers Region, Northern Territory, Australia, experimentally exposed to mean elevated Ra-226 water concentrations ranging between 0.95 and 1.85 Bq 1−1 for 28 days, accumulated Ra-226 in their tissue to mean concentrations ranging from 2.8 to 4.8 Bq per gram of dry tissue. The Ra-226 (log10) was accumulated in a linear pattern over exposure periods of 28 and 56 days. Mussel size and sex had little or no effect on the rates of uptake of Ra-226 per gram of tissue. Increased Ca and Mg water concentrations, both in combination and singly, reduced the rate of uptake of Ra-226 by mussel tissue. The experimental data are consistent with Ra-226 accumulation being inversely proportional to both Ca and Mg water concentrations; for Ca the constant of proportionality i.e. $$Ra = \frac{C}{{[Ca]}}$$ is unity; for Mg it is about 0.1. The results indicate competitive inhibition of the uptake of Ra-226 by Ca, i.e. that the mussel treated Ra-226 as a metabolic analogue of Ca; however, there are other possible interpretations of these results that need not invoke competitive inhibition. For Mg the results suggest involvement of some other mechanism(s) apart from or in addition to competitive inhibition of Ra-226 by Mg. Exposure of mussels that had accumulated Ra-226 under field and laboratory conditions to radium-free water for up to 286 days resulted in no significant loss (P 〉 0.05) of Ra-226 from the tissue. This indicates a very long biological half-life for Ra-226 in the tissue ofV. angasi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770242
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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