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  • Anisotropy  (1)
  • Dopamine  (1)
  • Springer  (2)
  • American Geophysical Union (AGU)
  • 1980-1984  (2)
  • 1960-1964
Collection
Keywords
Publisher
  • Springer  (2)
  • American Geophysical Union (AGU)
Years
  • 1980-1984  (2)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Lack of influence of isoproterenol, propranolol, and dopamine on immunoreactive parathyroid hormone and calcitonin in normal man (1983)
    Springer
    Calcified tissue international 35 (1983), S. 32-36 
    Details
    ISSN: 1432-0827
    Keywords: Isoproterenol ; Dopamine ; Propranolol ; PTH ; Calcitonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Available evidencein vitro andin vivo suggests that pharmacologic doses of isoproterenol stimulate the secretion of parathyroid hormone (PTH) and calcitonin (CT) and propranolol inhibits secretion. However, the findings in man are either quite modest or inconsistent. In view of this controversy, we examined the effects of isoproterenol, 0.15 µg intradermally (i.d.), dopamine, 5 µg/kg body weight over 60 min intravenously (i.v.), and propranolol, 1 mg over 5 min followed by 60 µg per min for 2 i.v. in normal human subjects. It was found that these agents did not alter serum calcium, serum immunoreactive PTH, or plasma immunoreactive CT. The findings do not support a physiologic role for biogenic amines in the control and regulation of PTH or CT secretion in normal man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405003
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  • 2
    Electronic Resource
    Electronic Resource
    Anisotropy in the dielectric properties of skeletal muscle (1983)
    Springer
    Medical & biological engineering & computing 21 (1983), S. 51-55 
    Details
    ISSN: 1741-0444
    Keywords: Anisotropy ; Skeletal muscle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The dielectric permittivity and conductivity of freshly excised dog skeletal muscle were measured at frequencies between 20 Hz and 1 MHz, with the tissue samples oriented either parallel or perpendicular to the applied electric field. At frequencies below 100 kHz a four-electrode technique was employed; at frequencies above 100 kHz a conventional two-electrode technique was used in conjunction with a commercial admittance bridge. All measurements were performed with the tissue sample at body temperature. Over the entire frequency range of the study, the dielectric properties of the muscle were found to be significantly anisotropic. At audio frequencies, the conductivity of the muscle measured in a direction parallel to the fibre orientation was typically found to be ten times higher than that measured perpendicular to the fibre axis; at frequencies approaching 1 MHz the conductivities measured in both directions approached a common value, near 8 ms cm−1. The dielectric permittivity in both orientations is strongly dependent on frequency. These data are analysed using the suspension equation, and comments are made on the mechanisms that are responsible for the observed properties. In an Appendix these results are related to some of the very early work on the subject.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446406
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    Paper (German National Licenses)
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