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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 263-264 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A square current pulse was used for the initial arc in the foregoing experiments, so that the gap conditions at the start of the recovery period were those of the steady-state arc, and any gas flow was determined solely by natural convection. Edels, Shaw and Whittaker3 measured recovery ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Transportation Research 4 (1970), S. 63-69 
    ISSN: 0041-1647
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Unfallchirurg 103 (2000), S. 891-894 
    ISSN: 1433-044X
    Keywords: Schlüsselwörter Skalpierungsverletzung ; Vakuumversiegelung ; Hautexpander ; Hundebiss ; Keywords Scalping injury ; Vacuum sealing ; Skin expander ; Dog bite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract The reconstruction of soft-tissue damage on the part of the head which is covered with hair is aimed not only at repairing the damage in such a way that it will withstand mechanical strain but also at the restoring the hair on the scalp. In a 5-year-old boy with a scalping injury involving second- and third-degree soft-tissue damage over an area of 20×12 cm after a dog bite, surgery was initially performed to transform the damage into purely second-degree damage, which was then repaired with a split skin graft. One year later, the scalp containing the hair was stretched with the aid of two skin expanders over a period of 3 months, so that the split skin graft area could be removed and the hair on the scalp restored.
    Notes: Zusammenfassung Die Rekonstruktion von Weichteilschäden am behaarten Kopf zielt neben einer mechanisch belastbaren Defektdeckung auf die Wiederherstellung der Kopfhautbehaarung ab. Bei einem 5-jährigen Jungen mit einer Skalpierungsverletzung mit teils zweit-, teils drittgradigem Weichteilschaden nach Hundebiss mit einer Ausdehnung von 20-mal 12 cm erfolgte zunächst über Vakuumversiegelungen die Umwandlung in einen rein zweitgradigen Defekt, der dann mit einem Spalthauttransplantat gedeckt wurde. Mittels zweier Hautexpander wurde 1 Jahr später die behaarte Kopfhaut über 3 Monate gedehnt, sodass das spalthautgedeckte Areal exzidiert werden konnte und die Kopfhautbehaarung wiederhergestellt war.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 73 (1996), S. 202-209 
    ISSN: 1439-6327
    Keywords: Peripheral chemoreceptors ; Hypoxic ventilatory response ; Altitude acclimatization ; High altitude
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Hypoxic ventilatory response (HVR) was examined before and after acclimatization to high altitude. Transient hyperoxic switches according to Dejours's technique were used to examine the contribution of HVR to the hyperpnoea of increasing exercise intensities. Ten mountaineers were exposed to hypoxia (oxygen fraction in inspired gas,F 1O2 = 0.11, 79 mmHg) before the expedition and after return from altitude (56 days, 30 days at 4900 m or higher). After 25-min breathing hypoxic gas, the subjects performed a maximal cycle ergometer test (increments 50 W per 5 min). Respired gases and ventilation $$(\dot V_E )$$ were analysed breath-by-breath, partial pressure of oxygen (PO2) and oxygen saturation (SO2) were measured in capillary blood. The HVR was tested by switching two breaths to anF 1O2 of 1.0. The nadir of $$\dot V_E $$ after the switch was measured (decrease in ventilation, D $$\dot V_E $$ ). The HVR was expressed as the D $$\dot V_E $$ at a PO2 of 40 mmHg (D $$\dot V_{E40} $$ ) and the D $$\dot V_E $$ versus decrease ofSO2 (D $$\dot V_E $$ /[100 −SO2]). The HVR estimated by D $$\dot V_{E40} $$ increased from 19.9 to 28.01 · min−1 (median,P = 0.013). The HVR expressed as D $$\dot V_E $$ /(100 −SO2) at rest was no different before and after acclimatization (0.89 and 0.86 l · min−1 · %−1, respectively) and during exercise it did not change before the expedition (0.831 · min−1 %−1). However, D $$\dot V_E $$ /(100 −SO2) increased significantly with exercise intensity after the expedition (1.61 l · min−1 · %−1 at 200 W). The changes of D $$\dot V_E $$ versusSO2 as well as of D $$\dot V_E $$ versus $$\dot V_E $$ were steeper after the expedition than before. In summary, after return from 30 day at high altitude, an increased HVR was observed. The augmentation of HVR was evident at higher exercise intensities and we suggest that this reflects a change in sensitivity of the peripheral chemoreflex loop.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1439-6327
    Keywords: Hypoxia ; Exercise ; Rebreathing Alveolar-arterial difference ; Altitude acclimatization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Studies were made of pulmonary diffusion capacity and oxygen transport before and after an expedition to altitudes at and above 4900 m. Maximum power (P max) and maximal oxygen uptake (VO 2max) were measured in 11 mountaineers in an incremental cycle ergometer test (25W · min−1) before and after return from basecamp (30 days at 4900 m or higher). In a second test, cardiac output (Q c) and lung diffusion capacity of carbon monoxide (D L,CO) were measured by acetylene and CO rebreathing at rest and during exercise at low, medium and submaximal intensities. After acclimatization, VO2max and P max decreased by 5.1% [from 61.0 (SD 6.2) to 57.9 (SD 10.2) ml·kg−1, n.s.] and 9.9% [from 5.13 (SD 0.66) to 4.62 (SD 0.42) W·kg−1, n.s.], respectively. The maximal cardiac index and DL,co decreased significantly by 15.6% [14.1 (SD 1.41) 1·min−1 · m−2 to 11.9 (SD 1.44)1·min−1 m−2, P〈0.05] and 14.3% [85.9 (SD 4.36)ml·mmHg−1 min−t to 73.6 (SD 15.2) ml · mmHg−1 -min−1, P〈0.05], respectively. The expedition to high altitude led to a decrease in maximal Q c, oxygen uptake and DL,CO. A decrease in muscle mass and capillarity may have been responsible for the decrease in maximal Qc which may have resulted in a decrease of D L,CO and an increase in alveolar-arterial oxygen difference. The decrease in D L,CO especially at lower exercise intensities after the expedition may have been due to a ventilation-perfusion mismatch and changes in blood capacitance. At higher exercise intensities diffusion limitation due to reduced pulmonary capillary contact time may also have occurred.
    Type of Medium: Electronic Resource
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