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  • 1
    Electronic Resource
    Electronic Resource
    Impact of volcanic fluoride and SO2 emissions from moderated activity volcanoes on the surrounding vegetation (1984)
    Springer
    Bulletin of volcanology 47 (1984), S. 491-496 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Studies in the regions of the volcanoes Etna (Italy) and Masaya (Nicaragua) show that the continuous emissions of gaseous pollutants (HF and SO2) from moderated activity volcanoes causes a chronic pollution in the surrounding vegetation with certain economical and ecological consequences. Reciprocally the measure of the pollutants in the plants growing in volcanic regions may be a simple and fast method to investigate some characteristics of the volcanic plume: for example, intensity of the emissions of gas, direction and extent of the plume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01961221
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modifications of the leaf surface structures of Quercus ilex L. in open, naturally CO2-enriched environments (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 21 (1998), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Two Italian CO2 springs allowed us to study the long-term effect of a 350–2600 μmol mol–1 increase in CO2 concentrations on the surface structures of leaves of Quercus ilex L. Carbon dioxide increased the quantity of cuticular waxes, above an apparent threshold of 750 μmol mol–1 CO2. Leaf wettability was not modified by CO2 concentrations. Reduction in stomatal frequency was observable up to 750 μmol mol–1 CO2, the slope being almost the same as that estimated for the increase in CO2 concentration from pre-industrial times to the present. At higher concentrations, CO2 seemed to exert no more impact on stomatal frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.1998.00358.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic parameters in the compartmental analysis of lithium transport in Lemna gibba using the stable isotopes, 6Li and 7Li, as tracers (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 61 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Due to the lack of a convenient radiotracer of Li, we have used the stable isotopes, 6Li and 7Li, for unidirectional flux measurements in Lemna gibba L. (GI). Detection was performed using an ionic microanalyser. The conventional method of compartmental analysis has been improved in several ways. Growth of the plant samples has been taken into consideration. The possible non-uniqueness of the kinetic solution fitting the experimental points has been considered by numerical calculation. The derivatives and not only the direct functions have been used in order to detect whether a constant term had to be added to the first-order terms. The validity of the estimates of the characteristic parameters of transport has been checked by using efflux and influx data simultaneously. The “manipulation-shock” effects have been shown not to be negligible. The kinetic data have no simple biological significance per se, but they can serve to calculate cellular parameters of transport when combined with appropriate stereometric data. These considerations are relevant not only to our present problem, but to any type of compartmental analysis, whatever the plant sample and the absorbed substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb05903.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Chemicals on the leaf surface, information about the plant available to insects (1996)
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 197-201 
    Details
    ISSN: 1570-7458
    Keywords: primary metabolites ; sugars ; amino acids ; leaf cuticle ; wax
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194756
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Early effects of decapitation on the Mg2+-K+ ATPase and cation contents in lateral buds of the aquatic fern,Marsilea drummondii A. Br. (1985)
    Springer
    Protoplasma 127 (1985), S. 192-203 
    Details
    ISSN: 1615-6102
    Keywords: ATPases ; Cation content ; Light microscopic cytochemistry ; Mg2+-K+ ATPase ; Plasma membrane ; Transfer cells ; X-ray microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A detailed comparison of Mg2+-K+ ATPase activity and cation fluxes in terminal buds, inhibited buds or buds released from apical dominance was carried out. Light microscope observations indicate intense reaction at the plasmalemma of stelar cells, pericyclic, phloem and xylem transfer cells at nodes along the main rhizome. In intact plants, with the exception of pericyclic cells, bud branches show no ATPase activity. Excision of the terminal bud results in rapid (within 5–15 minutes) stimulation of ATPase activity at nodes and all bud axes. As the subapical bud gains precedence, ATPase stimulation ceases and returns to its initial level in the older median and basal buds. Enzyme activation is kinetically correlated with K+ flux. X-ray microanalysis confirms that K+ accumulates in the stele at the node and the bud branch with the same lag period. This data increases the evidence for close association between ATP (Sossountzov et al. 1982), ATPase activity and K+ flux. The kinetics strengthen the impression that these factors may be involved very early in bud outgrowth regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276263
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    Paper (German National Licenses)
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