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  • 1985-1989  (1)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Cerebral Cortical Glucose Utilization in the Conscious Rat: Evidence for a Circadian Rhythm (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 34 (1980), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The presence of a circadian rhythm of glucose utilization was demonstrated in vivo in rat cerebral cortex. The activity pattern of the rats, living in a controlled lighting regimen with lights on from 7 a.m. to 7 p. m., appeared to coincide with the rate of glucose consumption in the brain. The rate of utilization was measured at 3-h intervals throughout the day and was found to fall from a maximum at 3 a.m. of 0.98 ± 0.13 μmol min−1 g−1 to a minimum of 0.70 ± 0.08 μmol min−1 g−1 at 3 p. m. Brain glucose also varied with time and its fluctuating level weakly correlated with its rate of utilization. Animals entrained on a 5-h (4: 30-9: 30 p. m.) feeding schedule had a similar circadian rhythm, with only a slight increase in amplitude. Reversal of the light cycle caused a disruption in the normal rhythm, but utilization still varied significantly with time of day. The results both indicate the potential error that can be encountered in experiments done at different times of the day and stress the need for awareness of time of day as a factor in measurements of alterations of metabolic rate in the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1980.tb11263.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Floral evidence for Cretaceous chloranthoid angiosperms (1986)
    [s.l.] : Nature Publishing Group
    Nature 320 (1986), S. 163-164 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The earliest well-documented angiosperm fossils include pollen grains of Clavatipollenites hughesii, originally described from the late Barremian and Aptian of southern England5'9'10. Couper5 noted the resemblance of these pollen grains to those of the extant chloranthaceous genus Ascarina, and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/320163a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Book Reviews (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 236-236 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00288442
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    Paper (German National Licenses)
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