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  • 1
    Electronic Resource
    Electronic Resource
    Influence of tobacco leaf surface chemicals on germination ofPeronospora tabacina adam sporangia (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1565-1576 
    Details
    ISSN: 1573-1561
    Keywords: Nicotiana ; Solanaceae ; Peronospora tabacina ; blue mold ; Alternaria alternata ; leaf surface chemistry ; diterpenes ; sucrose esters ; hydrocarbons ; spore germination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Chromatographic procedures were utilized to isolate and purify components of tobacco cuticular extracts and leaf surface chemicals.In vitro microbial bioassays determined the influence of these leaf surface compounds on germination and germ tube morphology ofP. tabacina sporangia, the tobacco blue mold pathogen, and to a lesser extentAlternaria alternata, the tobacco brown spot pathogen. Exposure to 10 μg/cm2 of α- and β-duvatrienemonols, sucrose esters, or hydrocarbons did not inhibit germination, whereas germination was significantly decreased bycis-abienol.cis-Abienol did not inhibit sporangial germination when combined with sucrose esters or hydrocarbons at a combined 10 μg/cm2. Germination of sporangia was completely inhibited by α- and β-duvatrienediols. In contrast to a previous report, α-DVT-diol was more inhibitory than the β isomer. Toxic effects of the DVT-diols were not altered by pH. Diluting the DVT-diols to less than 0.1 μg/cm2 resulted in a small but significant stimulation of germination. Previously, the DVT-diols had been identified only as inhibitory toP. tabacina. None of the leaf surface chemicals affected germination ofA. alternata conidia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014090
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of aerosol sulfur and crustal element concentrations in particle size fractions from continental U.S. locations (1979)
    Springer
    Water, air & soil pollution 12 (1979), S. 431-440 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A comparison of element concentrations in aerosols is made for S, Si, K, Ca, Ti, Fe, and Zn as a function of particle size during April 1976 in nonurban New Mexico, Colorado, and New Hampshire and urban and nearby rural St Louis, Missouri. In the submicrometer diameter range at all sites, S greatly exceeds Si, K, Ca, Ti, and Fe, which occur predominantly in the coarse particle (〉1 μm) fraction. Particle size distributions of each of these elements are similar among the five sites, but prominent concentration anomalies and secondary size distribution differences are measureable and suggest differences in aerosol production processes and relative pollution source strengths. The results are potentially useful in evaluating causes of atmospheric visibility differences between the western and eastern U.S.A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046864
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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