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  • 1
    Electronic Resource
    Electronic Resource
    Minimal cost per twitch in rattlesnake tail muscle (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 71-72 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Tail shaking by the western diamondback rattlesnake (Crotalus atrox) produces a noise at frequencies audible to large mammals4'5. Rattling is accomplished by unfused, high-frequency muscular contractions, made possible by an extraordinarily high density of sarcoplasmic reticulum and T tubules (26% ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383071a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Running energetics in the pronghorn antelope (1991)
    [s.l.] : Nature Publishing Group
    Nature 353 (1991), S. 748-750 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Maximum oxygen consumption (Vo2 max) was measured in an open-flow system with the animals galloping up an 11% incline at about 10ms1. Because all animals have an upper limit to the power output that can be fuelled aerobically, when additional power is required beyond the 'maximum aerobic speed', it ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/353748a0
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  • 3
    Electronic Resource
    Electronic Resource
    Regulated hypothermia in the desert shrew (1980)
    Springer
    Journal of comparative physiology 137 (1980), S. 173-176 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Desert shrews (Notiosorex crawfordi; 4 g) enter into daily bouts of very shallow torpor, when restricted in their food intake. These bouts, though interrupted and uneven, last throughout that portion of the day the animals' cages are lighted. Body temperature is apparently regulated by fine adjustments of metabolic heat production in hypothermic as well as euthermic desert shrews. Thus, these animals seem to have two temperature thresholds for thermoregulation or body temperature rheostat settings. One is near 38 °C while the other, near 28 °C is likely used exclusively when energy supplies are low. The coefficient of heat transfer is the same at both body temperatures. Power saved by hypothermic animals at air temperatures between 20 and 25 °C amounts to about 96 mW. This is half of the metabolic power output of euthermic shrews at 20 °C and 80% at 25 °C. These results suggest a compromise between the energy savings of a deep torpor and the unimpaired functioning of euthermia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00689217
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Morphological study of the desert heteromyid kidney with emphasis on the genus perognathus (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 194 (1979), S. 461-468 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The renal morphology of three species of desert dwelling Perognathus rodents were compared to Dipodomys and two species of sympatric cricetid rodents. Perognathus has a highly adapted unipolar kidney capable of urine concentration up to 7,500 mOsm/KgH2O. Two major modifications were observed in these kidneys. (1) There is elongation of both the inner and outer medulla. When the thickness of the regions in P. penicillatus are factored by kidney weight it is found that the outer medulla is 3.8 and the inner medulla is 2.2 times greater in length than the extensively studied Dipodomys merriami. (2) There is great variance in glomerular size with approximately 20% of the glomeruli being very large and located in the juxta medullary region. These glomeruli are 1.5-1.6 times greater in diameter than the more numerous superficial glomeruli. These structural modifications are quantitated and the functional implications are discussed particularly in relation to urine concentrating ability in these desert inhabitants.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091940311
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