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  • 1995-1999  (2)
  • 1975-1979
  • 1940-1944
  • 1999  (2)
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  • 1995-1999  (2)
  • 1975-1979
  • 1940-1944
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  • 1
    Electronic Resource
    Electronic Resource
    Conductance Method for the Measurement of Cross-Sectional Areas of the Aorta (1999)
    Springer
    Annals of biomedical engineering 27 (1999), S. 141-150 
    Details
    ISSN: 1573-9686
    Keywords: Conductivity ; Erythrocytes ; Ultrasound ; Shear stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract A modified conductance method to determine the cross-sectional areas (CSAs) of arteries in piglets was evaluated in vivo. The method utilized a conductance catheter having four electrodes. Between the outer electrodes an alternating current was applied and between the inner electrodes the induced voltage difference was measured and converted into a conductance. CSA was determined from measured conductance minus parallel conductance, which is the conductance of the tissues surrounding the vessel times the length between the measuring electrodes of the conductance catheter divided by the conductivity of blood. The parallel conductance was determined by injecting hypertonic saline to change blood conductivity. The conductivity of blood was calculated from temperature and hematocrit and corrected for maximal deformation and changes in orientation of the erythrocytes under shear stress conditions. The equations to calculate the conductivity of blood were obtained from in vitro experiments. In vivo average aortic CSAs, determined with the conductance method CSA (G) in five piglets, were compared to those determined with the intravascular ultrasound method CSA(IVUS). The regression equation between both values was CSA (G) =−0.09+1.00·CSA(IVUS) r=0.97, n=53. The mean difference between the values was −0.29% · 5.57% (2 standard deviations). We conclude that the modified conductance method is a reliable technique to estimate the average cross-sectional areas of the aorta in piglets. © 1999 Biomedical Engineering Society. PAC99: 8780-y, 8437+q, 8719Nn
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1114/1.219
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic analysis of postharvest flower longevity in Asiatic hybrid lilies (1999)
    Springer
    Euphytica 107 (1999), S. 149-157 
    Details
    ISSN: 1573-5060
    Keywords: combining ability ; flower longevity ; heritability ; Lilium L. ; male sterility ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To investigate the genetic regulation of postharvest flower longevity in Asiatic hybrid lilies (Lilium L.), 10 cultivars and 45 progenies were forced, harvested and evaluated under standardised conditions in growth chambers. Analysis of variance for individual flower longevity indicated highly significant (p 〈 0.001) variation among parents, among progenies and among descendants within progenies. High broad-sense heritability (0.79) calculated at the individual plant level indicated that selection for long individual flower longevity can be expected to be very effective. General combining ability (GCA) effects were highly significant ( p 〈 0.001), and the estimated narrow-sense heritability was high (0.74). Therefore, individual flower longevity of a genotype can be used as an indication for its breeding value. Although deviating results can be expected as specific combining ability (SCA) effects were also significant ( p = 0.046). Small, but significant correlations between individual flower longevity and other plant characters were found. The impact of these correlations on the selection efficiency for improved postharvest performance of lily inflorescences is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026493902668
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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