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  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 152 (1993), S. 1024-1029 
    ISSN: 1432-1076
    Keywords: Bronchopulmonary dysplasia ; Mechanical ventilation ; Radiology ; Cytology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sequential chest radiographs from 40 newborn infants requiring assisted ventilation for respiratory distress syndrome or other conditions were evaluated with a new scoring system aiming at identifying abnormal expansion patterns and interstitial infiltrates representing an early stage of bronchopulmonary dysplasia (BPD). Age at examination ranged from 3 to 23 days. Tracheal effluent samples obtained from the babes during the same period of observation were examined cytologically for evidence of regenerating airway epithelium with squamous metaplasia, indicating BPD. According to the radiological scoring system 24 babies (60%) developed BPD, first diagnosed at a median age of 9 days. By cytological criteria 20 babies (50%) developed BPD, first diagnosed at a median age of 10.5 days. The results from radiological and cytological diagnosis of BPD were concordant in 16 babies (P〈0.05 by chi-square test). Using oxygen dependency at the age of 28 days as evidence of established BPD, the radiological scoring system alone had a sensitivity of 93% and a specificity of 53%. The corresponding figures for cytological assessment alone were 73% and 58%, respectively. By combining radiological and cytological findings, values for sensitivity and specificity were 67% and 68%, respectively.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 28 (1993), S. 0 
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Based on experience accumulated in a number of laboratories, a standardized protocol for phototoxicity testing in experimental animals by the dermal route is presented. By conducting a limited interlaboratory study, demonstrating a high degree of consistency using 8-methoxypsoralen {8-MOP) and acridine, the sensitivity and reproducibility of the proposed methodology is demonstrated. Important aspects of performing phototoxicity testing are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 3 (1992), S. 278-282 
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The potential for dental materials to irritate human oral mucosal membranes was assessed by an electrical impedance technique. A small electrode at the site of irritation on the inside of the cheek and a large electrode on the outside of the cheek were used. Skin impedance was reduced by inundation with ECG-gel. An irritation index was formed by calculating the quotient between the impedance absolute value at 20 kHz and the impedance value at 1 MHz. Electrical impedance technology was found to be more sensitive than traditional visual registration of mucosal reactions. Two series of experiments were performed in which special appliances were constructed to ensure duplicate measurements on the small area of exposed buccal mucosa. Liquid samples elicited differentiated fast response, which was insignificantly influenced by mechanical factors. The mechanical irritation induced by merely the shape of a solid specimen prevents detection of slight mucosal irritation from potentially leaking substances.
    Type of Medium: Electronic Resource
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