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  • 1
    Electronic Resource
    Electronic Resource
    Some effects of long-term ozone fumigations on Norway spruce (1987)
    Springer
    Trees 1 (1987), S. 129-133 
    Details
    ISSN: 1432-2285
    Keywords: Ozone Photosynthesis ; Picea abies ; Stomata ; Transpiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potted cuttings of a 12-year-old, and grafts of an 80-year-old, Norway spruce (Picea abies (L.) Karst.) were subjected to 100 or 300 μg O3·m−3 for 1215 h (45 h of daylight per week) during the growing season of 1985. At the end of the fumigation the plants did not exhibit any visible signs of injury. Whereas in the fumigation with 100μg O3·m−3 we did not detect any significant change in gas exchange, 300 μg O3·m−3 did alter the CO2 uptake after 27 weeks, and in one clone transpiration was also altered. Stomatal reaction to a change of light suggested sluggishness, but the change was not statistically significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203581
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some effects of long-term ozone fumigation on Norway spruce (1987)
    Springer
    Trees 1 (1987), S. 145-150 
    Details
    ISSN: 1432-2285
    Keywords: Ozone ; Picea abies ; Stomata ; Wax
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potted cuttings of a 12-year-old Picea abies tree were fumigated with ozone, 100 or 300 μg O3· m−3 (50 or 150 ppb O3) being added to charcoal-filtered air during the 1985 growing season for a total of 1215 h. The wax structure of ozone-fumigated needles was no different from that of controls. Because flattened wax structures and fused wax fibrils also occurred in controls, these phenomena could not serve as bioindications for the ozone concentrations applied. A smooth layer was found beneath the soluble wax layer and covered needle surface and stomatal openings of ozone-fumigated needles to a greater extent than in controls. Wax quantity was considerably reduced by fumigation with 300 μg O3 · m−3. Leaf pigments (as extracted with the wax) were less abundant in needles treated with 300 μgO3; the smooth layer probably contributed to the impeded extraction of pigments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193557
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Mechanical behavior of the human lumbar spine. I. Creep analysis during static compressive loading (1987)
    Hoboken, NJ [u.a.] : Wiley-Blackwell
    Journal of Orthopaedic Research 5 (1987), S. 467-478 
    Details
    ISSN: 0736-0266
    Keywords: Viscoelasticity ; Creep analysis ; Lumbar motion segment ; Compression ; Disc degeneration ; Aging ; Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The in vitro viscoelastic “creep” behavior was examined in 18 cadaveric human lumbar motion segments subjected to static axial compressive loads. Axial deformation was followed for 30 min under constant applied load. Compressive material constants (moduli and viscosity coefficients) were then determined for each intervertebral disc using a linerization method based on a Taylor series expansion of experimental data for the “three parameter” viscoelastic creep model. The degree of disc degeneration and bone mineral content (BMC) were also assessed. Good correlation between the experimentally determined and model predicted strain values were found, with the average error 〈1%. We found that motion segments from older and more degenerated lumbar discs were less stable and had lower material constants than segments from younger and less degenerated discs. Material constants and BMC correlated closely, suggesting that an interdependency of disc and vertebral body properties exists. No correlation between the creep characteristics and disc height, disc area, segment level, or sex were noted.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jor.1100050402
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    Paper (German National Licenses)
    Fulltext
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