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  • 52-55  (1)
  • Anoxic coma  (1)
  • Carotenoids  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Frequency stability of a mercury ion frequency standard (1981)
    Springer
    Applied physics 24 (1981), S. 107-112 
    Details
    ISSN: 1432-0630
    Keywords: 06.30 F ; 32 ; 35 ; 52-55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Observation with an improved signal-to-noise ratio of the hyperfine resonance pattern of199Hg+ stored in a radiofrequency trap is reported. A frequency control loop which locks the frequency of a 5MHz quartz crystal oscillator to the hyperfine transition of stored mercury ions, close to 40.5 GHz, is described. In this system, pulses delivered by the photomultiplier are processed digitally. Optimal conditions for the interrogation of the hyperfine transition are specified. A fractional frequency stability σy(τ)=3.6×10−11τ−1/2 for 10s〈τ〈3500s has been obtained. This frequency stability is comparble to that of commercially available cesium beam frequency standards. Prospect for improvement by a factor of at least 10 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902264
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  • 2
    Electronic Resource
    Electronic Resource
    Time course of oxidative stress after major burns (2000)
    Springer
    Intensive care medicine 26 (2000), S. 800-803 
    Details
    ISSN: 1432-1238
    Keywords: Keywords Burns ; Oxidative stress ; Antioxidants ; Vitamin C ; Trace elements ; Carotenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective: To evaluate oxidative stress resulting from major burns in humans.¶Design: Prospective clinical study with control group.¶Setting: Mechanically ventilated adult patients admitted with more than 30 % total burn surface area.¶Patients and participants: 20 patients with a mean body surface burned area of 54 %.¶Measurements and results: The oxidative stress evaluation was based on measurements of trace elements, vitamins, antioxidant enzymatic activity and end-products of lipid peroxidation. During the first 5 days after injury burn patients exhibit a decrease in selenium and antioxidant vitamins (C, β-carotene, lycopene) and an increase in lipid peroxidation products (TBARS).¶Conclusion: Our results suggest that major burn is associated with oxidative stress during the 5 days after the initial injury, as demonstrated by a simultaneous decrease in antioxidant vitamins and a large increase in TBARS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001340051250
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  • 3
    Electronic Resource
    Electronic Resource
    Prognostic significance of early intracranial and cerebral perfusion pressures in post-cardiac arrest anoxic coma (1991)
    Springer
    Intensive care medicine 17 (1991), S. 392-398 
    Details
    ISSN: 1432-1238
    Keywords: Out of hospital cardiac arrest ; Anoxic coma ; Intracranial pressure ; Cerebral perfusion pressure ; Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The prognosis of prolonged cardiac arrests is generally related to brain damage due to the cerebral anoxia. A neurological worsening leading to irreversibility is sometimes associated with an increase in intracranial pressure. We studied for 5 years the early intracranial and cerebral perfusion pressures in 84 patients with deep anoxic coma after cardiac arrest. Intracranial pressure monitoring was set up as soon as possible with an extradural screw over a period of 6 days. No complications occured using this technique. We recorded the percentage of patients suffering from intracranial pressure peaks over 15 mmHg (a), over 25 mmHg (b) or cerebral perfusion pressures drops under 50 mmHg (c). We obtained during the 1 st day of monitoring: (a) 46.4%, (b) 21.4%, (c) 39%; during the 2nd day: (a) 73.6%, (b) 26.3%, (c) 55.9%. Eight patients (9.5%) were still alive after a couple of months, 4 of whom had no neurological sequelae; among the 76 non-survivors 63 (82.9%) had died because of cerebral anoxic damage. A daily comparison between survivors and non-survivors points out that the survivors' intracranial pressures were always lower than in the nonsurvivors and the survivors' cerebral perfusion pressures higher than in the non-survivors. Moreover, none of the patients showing intracranial peak pressures over 25 mmHg survived without after-effects. It is clear that many patients suffer early periods of high intracranial pressures and low cerebral perfusion pressures leading to a bad neurological prognosis. Intracranial pressure monitoring may allow assessment of patients' neurological status and prognosis after cardiac resuscitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01720676
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    Paper (German National Licenses)
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