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  • 1
    Electronic Resource
    Electronic Resource
    An analysis of risk from exposure to aldicarb using immune response of nonuniform populations of mice (1990)
    Springer
    Archives of environmental contamination and toxicology 19 (1990), S. 447-456 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The immunomodulation response of mice to low levels of aldicarb in drinking water was investigated in four series of studies. The splenic plaque forming cell (PFC) response to red sheep cells were measured for treatment levels of 0.01 to 1,000 ppb (μg/kg). Based on their beginning and end body weights, the animal populations were uniform in all series of tests, but based on their net body weights and PFC counts they were highly nonuniform in the 30 and 60 day tests and uniform in the 90 and 180 day tests. The mean PFC counts for animals in each treatment were calculated and compared with the mean PFC counts for animals in the controls in all four series of tests. This approach ignores the variability and nonuniformity in the animal population. The outcomes using this approach were stimulatory for the 30 and 60 day tests and inhibitory for the 90 and 180 day tests. An alternative approach was developed based on the analysis of the distributions of the relative PFC counts of each animal in a treatment with each animal in a control, and specifically addresses the variability and nonuniformity in animal population as integral parts of the analysis. The distribution peaks were estimated by maximum likelihood and kernel/bootstrap procedures and were used to summarize the tests. The outcomes were consistently inhibitory, indicating immune suppression. The outcome of this approach converged to the outcome of the mean PFC approach for the 90 and 180 day tests where the animal populations were uniform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054991
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aldicarb immunomodulation in mice: An inverse dose-response to parts per billion levels in drinking water (1987)
    Springer
    Archives of environmental contamination and toxicology 16 (1987), S. 433-439 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The effects of aldicarb (a carbamate insecticide and nematocide) on selected immune and non-immune parameters of mice were examined. The primary objective was to determine whether exposure to low levels of aldicarb through drinking water could affect selected immune functions. Aldicarb was administered via drinking water either at 10, 100, and 1,000 parts per billion (ppb)2 for 14 days or at 1, 10, 100, and 1,000 ppb for 34 days. The 34-day experiment was repeated twice with minor variations. Aldicarb significantly and repeatedly suppressed the splenic plaque forming cell response to sheep red blood cells at the lowest concentrations tested: the 1 ppb level elicited greater suppression of plaque forming cells and other immune factors than did 1,000 ppb of aldicarb. This inverse dose-response represents a dramatic departure from the classic toxicologic dose-response curve, where toxicity increases with increasing dose levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055264
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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