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  • Allelopathy  (2)
  • 81.40  (1)
  • Springer  (3)
  • Springer Nature
  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen depth profiling using18O ions (1995)
    Springer
    The European physical journal 351 (1995), S. 453-465 
    Details
    ISSN: 1434-601X
    Keywords: 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear resonant reaction analysis techniques for hydrogen depth profiling in solid materials typically have used15N ion beams at 6.40 MeV and19F ion beams at 6.42 MeV, which require a tandem accelerator. We report a new technique using an18O ion beam at a resonance energy of 2.70 MeV, which requires only a single stage accelerator. Improved values of the nuclear parameters for the 2.70 MeV (18O) and 6.40 MeV (15N) resonances are reported. The beam energy spread was investigated for different ions and ion charge states and found to scale with the charge state. Data obtained using atomic and molecular gas targets reveal the research potential of Doppler spectroscopy. Examples of hydrogen depth profiling in solid materials using15N and18O ion beams are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291151
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Willows (Salix brachycarpa) on Populations of Salicylate-Mineralizing Microorganisms in Alpine Soils (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 2049-2057 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; alpine soils ; salicylate ; Salix ; SIGR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We used the substrate-induced growth-response (SIGR) method to quantify salicylate-mineralizing microbes and total microbial biomass in soils from under willows (Salix brachycarpa) and in surrounding meadows dominated by the sedge Kobresia myosuroides. Willows had a strong effect on the biomass of salicylate-mineralizing microbes in both years of this study. There were always higher biomass levels of salicylate mineralizers in soils from under Salix (4.6–10.1 μg C/g) than under Kobresia (0.23–0.76 μg/g). In contrast, total microbial biomass was not significantly different under these plant species in 1996 and was only higher under Salix on one date in 1997. These results show that the standing biomass and activity of salicylate-mineralizing microbes can be greatly enhanced by salicylate-producing plants in the field. Given this finding, it is unlikely that simple phenolic compounds like salicylate would persist for very long in soil beneath the plants that produce them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005508230152
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  • 3
    Electronic Resource
    Electronic Resource
    Degradation of juglone by soil bacteria (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1561-1571 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; biodegradation ; humic acids ; Juglans nigra ; juglone ; nonlinear regression ; Pseudomonas putida biovar A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Bacteria that can degrade juglone (5-hydroxy-1,4-naphthoquinone) were isolated from soil beneath black walnut trees. Autecological studies with one of these bacteria (Pseudomonas J1), demonstrated that it could grow rapidly using juglone as its sole source of carbon and energy. Using nonlinear regression analysis and the Monod equation, it was determined that this bacterium had a high affinity for juglone (K s = 0.95 μg/ml).Pseudomonas J1 can also utilize other aromatic compounds from plants as its sole source of carbon and energy. Compounds such as chlorogenic acid, ferulic acid, gallic acid, and 2-hydroxy-1,4-naphthoquinone (Lawson) were rapidly degraded byPseudomonas J1. The rapid degradation of juglone and other suspected allelochemicals by soil bacteria make it unlikely that these compounds are important mediators of plant-plant interactions under natural conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012522
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