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  • Articles: DFG German National Licenses  (2)
  • Electronic Resource  (2)
  • Forelimb movements  (1)
  • metal ion stress  (1)
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  • Articles: DFG German National Licenses  (2)
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  • Electronic Resource  (2)
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Movement and muscle activity during contact placing of the forelimb and their relations to other postural reactions in the cat (1990)
    Springer
    Experimental brain research 79 (1990), S. 373-382 
    Details
    ISSN: 1432-1106
    Keywords: Contact placing ; Forelimb muscles ; Forelimb movements ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Forelimb trajectory and the activity of eight muscles operating at the elbow, wrist and digit joints were compared during the contact placing reaction, during the swing phase of locomotion and during reactions induced by swing perturbations, to verify the hypothesis that common neural mechanisms are involved in these reactions. Both the patterns of muscle activation and forelimb kinetics during the placing reaction greatly differed from those during the swing phase of locomotion. Both similarities and differences have been found between the placing reaction and the reaction to swing perturbations. Similar latencies, patterns of muscle activation and trajectories have been found for elbow movements while considerable differences were seen in the movements of distal joints. Both reactions started with a backward and upward movement at the proximal joints which was accompanied by a locking at the elbow. At the distal joints, tactile stimuli evoked first a wrist ventroflexion during the placing reaction, whereas they induced wrist dorsiflexion to swing perturbations. A further difference between these two reactions appeared at the beginning of the extension which was highly passive during the reaction to swing perturbation and active during contact placing. These results suggest that some common, most likely spinal, reflexes are involved at the beginning of the two reactions while their extension phases are controlled in a different way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00608247
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Element content in tissues of spruce seedlings from hydroponic cultures simulating acidification and deacidification (1988)
    Springer
    Plant and soil 106 (1988), S. 231-238 
    Details
    ISSN: 1573-5036
    Keywords: fine roots ; hydroponic cultures ; metal ion stress ; nutrient deficiency ; soil acidification ; spruce
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In order to determine the primary causes of coniferous fine root damage and disfunction in acidic soils, hydroponic cultures of young spruce in pH neutral, acidic, and metal ion-amended media were established. After five months, physiological stress in the roots was removed by raising the pH in the acid and metal ion-amended cultures to physiological neutrality. The cellular element analytical techniques of x-ray microprobe (EDXA) and laser-micromass-spectroscopy (LAMMA) were applied to samples of various tissues of the cultured spruce. Nutrient uptake by the fine roots was blocked by the following ions in order of decreasing severity: Al3+〉H+〉Fe3+〉Mn2+. Magnesium uptake by the fine root apoplast was greatly inhibited by these blockers as was calcium. Al3+ and Fe3+ act predominantly in the root cortex, while Mn2+ is mobile throughout the whole plant. Besides the roots, nutrient deficiencies are also severe in the shoot bark and needles. Phloem processes might therefore be affected. The ion exchange functions of the fine roots are almost reversed by raising the pH of the solutions; the nutrient cations may then again be taken up by the apoplast and the crown status improved. The consequences of these findings are discussed with regard to soil processes and fertilization (liming) treatments under field conditions
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371218
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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