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  • 1
    Electronic Resource
    Electronic Resource
    Regional variations in human toxics exposure in the USA: An analysis based on the National Human Adipose Tissue Survey (1991)
    Springer
    Archives of environmental contamination and toxicology 21 (1991), S. 159-168 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Regional human exposure was evaluated by examining human tissue chemical concentrations. National Human Adipose Tissue Survey data for 54 toxic substances [pesticides, polychlorinated biphenyls (PCBs), semi-volatiles, volatiles, and polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs)], were sorted by United States census divisions. Regional differences in human toxics exposure were found. Based on the data analyzed, it appears that individuals residing in the South Atlantic, East South Central, West South Central, and East North Central regions may be exposed to greater amounts of toxic substances than those of other regions of the country. Higher concentrations of organochlorine pesticides, PCBs, and PCDDs in older individuals indicate that these toxics bioaccumulate in human adipose tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055332
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  • 2
    Electronic Resource
    Electronic Resource
    Role of theRete mirabile ophthalmicum in maintaining the body-to-brain temperature difference in pigeons (1979)
    Springer
    Journal of comparative physiology 129 (1979), S. 119-122 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Brain (hypothalamic) and colonic temperatures were measured in twenty adult pigeons (Columba livia) whose mean body mass was 0.377 kg. 2. In contrals, in sham operated birds, and in those pigeons in which one or both external ophthalmic arteries were occluded brain temperatures were always about 1°C (0.94 to 1.03) below body temperature (Fig. 2) over a range of air temperatures. 3. In pigeons in which arterial flow to theretia was totally blocked, the normal pattern of body-to-brain temperature difference wasreversed, such that brain temperature was always higher than body temperature by a mean of 0.36 °C (Fig. 2, Table 1). 4. Therete mirabile ophthalmicum of pigeons plays a central role in the maintenance of the body-to-brain temperature difference which may be important in avoiding brain damage during core hyperthermia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798175
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cardiorespiratory responses of the woodchuck and porcupine to CO2 and hypoxia (1989)
    Springer
    Journal of comparative physiology 159 (1989), S. 641-648 
    Details
    ISSN: 1432-136X
    Keywords: Cardiorespiratory responses ; Woodchuck ; Porcupine ; CO2 ; Hypoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The burrow-dwelling woodchuck (Marmota monax) (mean body wt.=4.45±1 kg) was compared to a similar-sized (5.87±1.5 kg) but arboreal rodent, the porcupine (Erithrizon dorsatum), in terms of its ventilatory and heart rate responses to hypoxia and hypercapnia, and its blood characteristics.V T,f,T I andT E were measured by whole-body plethysmography in four awake individuals of each species. The woodchuck has a longerT E/T TOT (0.76±0.03) than the porcupine (0.61±0.03). The woodchuck had a higher threshold and significantly smaller slope to its CO2 ventilatory response compared to the porcupine, but showed no difference in its hypoxic ventilatory response. The woodchuck P50 of 27.8 was hardly different from the porcupine value of 30.7, but the Bohr factor, −0.72, was greater than the porcupine's, −0.413. The woodchuck breathing air has PaCO2=48 (±2) torr, PaO2=72 (±6), pHa=7.357 (±0.01); the porcupine blood gases are PaCO2=34.6 (±2.8), PaO2=94.9 (±5), pHa=7.419 (±0.03), suggesting a difference in PaCO2/pH set points. The woodchuck exhibited no reduction in heart rate with hypoxia, nor did it have the low normoxic heart rate observed in other burrowing mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694390
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    Paper (German National Licenses)
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