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  • 1990-1994  (3)
  • 1955-1959
  • 1920-1924
  • 1990  (3)
  • Chemistry  (2)
  • Allocation patterns  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Components of relative growth rate and sensitivity to nitrogen availability in annual and perennial species of Bromus (1990)
    Springer
    Oecologia 84 (1990), S. 513-518 
    Details
    ISSN: 1432-1939
    Keywords: Bromus ; Allocation patterns ; Annual/perennial ; Relative growth rate ; Nitrate availability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two grass species, the annual Bromus sterilis and the perennial Bromus erectus, were grown from seeds for 28 days in a hydroponic culture system at 1 and 100 μM NO3 - in the nutrient solution. At 100 μM NO3 -, the relative growth rate (RGR) of the perennial was 30% lower than that of the annual. This was only the consequence of the higher specific mass of its leaves, since its leaf mass ratio was higher than that of the annual and the unit leaf rates (ULR), calculated on an area basis, were similar for the two species. At 1 μM, the RGR of the annual was 50% lower than at 100 μM, while that of the perennial was not significantly lower. This was due mainly to a lower ULR for the annual. while for the perennial ULR was the same in both treatments. These differences between the two species were all the more striking in that the differences in total nitrogen concentrations and nitrate reductase activities between the two treatments were very similar for both species. These different responses together with differences in the nitrogen productivity of the two species suggest that the level of nutrient availability may play an important role in the distribution of these Bromus species in natural habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328168
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    (3,3-Diphenylallenyliden)trimethylphosphantitanocen: der erste Carbentitanocenkomplex mit drei cumulierten Doppelbindungen (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 102 (1990), S. 1070-1071 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19901020916
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Aluminium-27 MAS NMR of Al2Ge2O7 and LaAlGe2O7: Two pentacoordinated aluminium environments (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. S82 
    Details
    ISSN: 0749-1581
    Keywords: 27 Al MAS NMR ; Quadruopolar interaction parameters ; Isotropic chemical shfits ; Spectral simulation ; Al2Ge2O7 ; LaAlGe2O7 ; Pentacoordinated aluminium environment ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Characterization by 27Al MAS NMR of two pentacoordinated environments of aluminium has been carried out in different fields and at different spinning speeds for Al2Ge2O7 and LaAlGe2O7. Complete simulations of the spectra have been performed, including computation of the individual shape and intensity of each spinning side band, which lead to the determination of both the quadrupolar interaction parameters and isotropic chemical shifts, and enable the detection of impurities in the material. The parameters determined are: .
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260281314
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    Paper (German National Licenses)
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