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  • 36.40  (3)
  • Browsing tolerance  (1)
  • EARTH RESOURCES AND REMOTE SENSING
  • Inorganic Chemistry
  • SPACE SCIENCES
  • 1990-1994  (5)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    The relationships between relative growth rate, meristematic potential and compensatory growth of semiarid-land shrubs (1992)
    Springer
    Oecologia 90 (1992), S. 391-398 
    Details
    ISSN: 1432-1939
    Keywords: Browsing tolerance ; Clipping ; Compensatory growth capacity ; Herbivory tolerance ; Meristematic potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Inherent relative growth rate has been suggested as a major determinant of plant species' capacity to regrow and compensate for tissues lost to herbivores. We investigated: 1) the relationship between compensatory growth capacity and relative growth rate (RGR) in six semiarid-land shrubs following removal in winter or spring of 90% of the previous year's growth, 2) the influence of loss of buds on production of new growth and 3) the relationship between meristematic potential and the capacity to produce new growth in four of the six semiarid-land shrub species. Four-year-old plants growing under field conditions were used in the study. The species with the highest inherent growth rate, sagebrush [Artemisia tridentata ssp. vaseyana (Rydb.) Beetle], died following the severe clipping treatments. The other five species exactly compensated for lost tissues. Inherent growth rates and compensatory growth capacity of the shrubs were not correlated. Loss of 90% of the buds on the previous year's growth did not limit production of new growth. Instead, shrubs that lost buds produced more new growth biomass than the controls. The shrub species had significantly different meristematic potential. Curlleaf mountain mahogany (Cercocarpus ledifolius Nutt.) and serviceberry (Amelanchier alnifolia Nutt.) had the greatest and least number of buds and long shoots per plant, respectively. The number of long shoots produced following bud removal was positively correlated with new growth biomass, while the percentage of long shoots produced at the basal position on twigs was negatively correlated with new growth biomass. Our results suggest that inherent growth rate is not likely to influence production of new growth following browsing when resources for growth are not limiting. In contrast, the ability of a shrub to initiate long shoot growth is likely to influence production of new growth even when resources for growth are abundant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317696
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  • 2
    Electronic Resource
    Electronic Resource
    Excitation and decay processes in helium clusters studied by fluorescence spectroscopy (1993)
    Springer
    The European physical journal 26 (1993), S. 175-177 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 67.90+Z ; 71.90+Q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitation and decay processes of helium clusters are investigated with fluorescence methods. The results differ remarkably from that obtained for the heavier rare gas clusters. They are discussed in view of the unusual structural and electronic properties of helium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429135
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  • 3
    Electronic Resource
    Electronic Resource
    Excitation and decay processes in helium clusters studied by fluorescence spectroscopy (1993)
    Springer
    The European physical journal 26 (1993), S. 382-384 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 67.90+Z ; 71.90+Q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitation and decay processes of helium clusters are investigated with fluorescence methods. The results differ remarkably from that obtained for the heavier rare gas clusters. They are discussed in view of the unusual structural and electronic properties of helium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429201
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  • 4
    Electronic Resource
    Electronic Resource
    Excitation and radiative decay of neutral and ionic ArN clusters studied by fluorescence spectroscopy (1993)
    Springer
    The European physical journal 26 (1993), S. 370-372 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 78.55-M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitation and decay processes of neutral and ionized ArN clusters are analysed using fluorescence spectroscopy with synchrotron radiation. The fluorescence yield of ionized ArN clusters is resonantly enhanced after excitation from states related to the atomic 3s levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429198
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  • 5
    Electronic Resource
    Electronic Resource
    Ein alternativer Weg zur Darstellung von Bi2Sr2CaCu2Ox, YBa2Cu3O7-δ, und YBa2Cu3-xMxO7-δ (M = Ni, Ag und x ≤ 33 Mol%)Professor Rudolf Hoppe zum 70. Geburtstage gewidmet (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 616 (1992), S. 186-190 
    Details
    ISSN: 0044-2313
    Keywords: Preparation of quaternary copper oxides ; high Tc superconductors ; characterization by X-ray powder methods ; AC- and DC-susceptibility ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: An Alternative Method for Preparation of Bi2Sr2CaCu3Ox, YBa2Cu3O7-δ, and YBa2Cu3-xMxO7-δ (M = Ni, Ag and x ≤ 33 Mol%)Oxidation of quenched melts of metals in a well defined argon/oxygen atmosphere has been found as an alternative method to prepare hight purity samples of Bi2Sr2CaCu2Ox without Pb-stabilization. A special equipment for the oxidation of powder samples will be described. By our new method it is also possible to prepare YBa2Cu3O7-δ and derivatives of this compound, where Cu is substituted by high amounts of Ni or Ag.
    Notes: Es wird eine alternative Präparationsmethode beschrieben, die es ermöglicht, durch Oxidation abgeschreckter Metallschmelzen in einer Sauerstoff-Argon-Strömungsapparatur sehr saubere, nicht Pb-stabilisierte Bi2Sr2CaCu2Ox-Präparate herzustellen. Dieser Weg ist auch für die Darstellung von YBa2Cu3O7-δ und Substitutionsderivaten dieser Verbindung mit hohen Konzentrationen an Ni oder Ag geeignet.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926161030
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