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  • Heart rate  (2)
  • 31.20.Lr  (1)
  • AbbreviationsACG acoustocardiogram  (1)
  • Abecarnil  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 348 (1994), S. 255-256 
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 31.20.Lr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We point out that an integral representation is possible for the Fermi functionsI −3/2,I −5/2,I −7/2,I −9/2, andI −11/2 that arise in the extended Thomas-Fermi theory of hot, non-relativistic fermion systems. These functions can thus be computed by straightforward numerical integration, thereby avoiding problems previously encountered.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2072
    Keywords: HPNS ; Primates ; Abecarnil ; GABA transmission ; EEG ; Behavioural observations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The neurophysiological interactions between the high pressure neurological syndrome (HPNS) and a newβ carboline, abecarnil, were studied in the nonhuman primatePapio anubis. Abecarnil is a partial agonist at the benzodiazepine site on the GABA/benzodiazepine receptor. Six animals were exposed on two occasions to pressures of 91 ATA in an environment of helium and oxygen. One exposure was pretreated with a total dose of abecarnil 1.0 mg/kg, the other with an equivalent volume of vehicle. Treatment with abecarnil prevented the severe signs of HPNS occurring between 51 and 91 ATA. Onset pressures of the various signs were unaffected. Some signs, e.g. myoclonus, became more frequent when abecarnil was used. A residual protective effect of abecarnil was present 4 weeks after the dose was given, active at pressures less than 71 ATA. Changes with pressure in the EEG were recorded primarily from the frontal cortex, but were also present in the parietal and occipital areas of the left cortex. Amplitude and frequency spectra were calculated and changes with pressure in the four conventional wavebands, plus two others, analysed. The most striking change was the prevention by abecarnil of the pressure-induced 100% increase in alpha wave amplitude in the frontal region. It is concluded that modulation of GABA transmission is important in controlling the expression of HPNS.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 169 (1999), S. 256-262 
    ISSN: 1432-136X
    Keywords: Key wordsCorvus corone ; Corvus macrorhynchos ; Embryo ; Chick ; Heart rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The developmental patterns of mean heart rate (MHR) and instantaneous heart rate (IHR) were investigated in embryos and chicks of altricial Corvuscorone and Corvus macrorhynchos. The MHR of embryos increased linearly with time from 250 beats · min−1 at mid-incubation to 290 beats · min−1 in hatchlings. MHR during the pipping period was maximal, but only marginally higher than in hatchlings. MHR was stable at about 290–300 beats · min−1 during the 1st week after hatching. Spontaneous heart rate (HR) decelerations and accelerations were found in embryos and chicks, disturbing the baseline HR with increasing frequency during development. However, the IHR accelerations developed later and were less frequent than in precocial species. IHR and body temperature decreased during mild cold exposure (23–25 °C) and IHR accelerations were reduced in nestlings during the 1st week. We suggest that the development of parasympathetic control of HR in crows occurs at 60% of incubation, similar to precocial embryos, but sympathetic control may be delayed and suppressed in contrast to precocial embryos.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-136X
    Keywords: Key words Avian ; Larus ; Growth ; Heart rate ; O2 pulse ; AbbreviationsACG acoustocardiogram ; ECG electrocardiogram ; HR heart rate ; MHR mean heart rate ; Q10 temperature coefficient ; Ta ambient temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We compared the developmental patterns of mean heart rate in Larus crassirostris and L. schistisagus embryos and chicks with other avian species of different hatchling developmental modes. We proposed that, since mean heart rate is inversely related to fresh egg mass in all birds, larger species reached a higher fraction of their hatchling mean heart rate by the end of the early phase of incubation and that heart rate contributions to supplying the increasing metabolic demands during mid and late incubation phases were less important than in smaller avian species. Mean heart rate was essentially independent of age throughout the mid-incubation phase (33% of normalised incubation until pipping), but increased with time during early (L. schistisagus only investigated) and late-incubation phases in both species. The O2 pulse of L. schistisagus embryos and chicks increased linearly with yolk-free body mass (log-log) after the early-phase of incubation until shortly before pipping, but was independent of body mass in the periods before and after. We conclude that a high heart rate in this first period is probably more important for increasing the circulation of nutrients to the embryo at a stage when extra-embryonic circulation to the yolk sac is limited by the size of the growing area vaculosa. Furthermore, large increases in mean heart rate during the late-incubation phase are probably important for increasing the cardiac output to hatching levels with onset of endothermy. However, mean heart rate is stable over the mid-incubation while O2 pulse increases, suggesting that increases in stroke volume and other circulatory adjustments may be entirely responsible for the largest increases in O2 transport during incubation of large avian species.
    Type of Medium: Electronic Resource
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