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  • 1
    Electronic Resource
    Electronic Resource
    Airborne microorganisms: Their occurrence, distribution and dependence on environmental factors — Especially on organic compounds of air-pollution (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 335-350 
    Details
    ISSN: 1420-9136
    Keywords: Aerosol ; Airborne microorganisms ; Air pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract For a period of approximately six months the concentrations of airborne microorganisms were determined by the uptake of their day-characteristic at local places differing by the extent of air pollution. By simultaneously recording the meteorological parameters as temperature, relative humidity, direction and velocity of wind and intensity of solar radiation, it was intended to find out the relationship between these factors and the viability of airborne microorganisms. The present data show an oscillation of the concentration counts over a wide range and seem not yet to depend on the local situation of air pollution. In a further series of experiments the atmospheric aerosol 〈10 μm was collected on ‘air-filters’. The decreased substances were extracted from the filter material by aqueous and organic solutants and tested for their antimicrobial activities. In this context the seasonal dependence of the microbicidal activity of organic compounds of aerosol is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01636890
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of soil acidity on the entomophilic nematode Steinernema kraussei Steiner (1990)
    Springer
    Biology and fertility of soils 9 (1990), S. 174-177 
    Details
    ISSN: 1432-0789
    Keywords: Cephalcia abietis ; Entomophilic nematode ; Picea abies ; Soil acidity ; Steinernema kraussei ; Endoparasite ; Air pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The free-living stages of Steinernema kraussei (Rhabditida), an endoparasite of Cephalcia abietis L. (Hymenoptera), are exposed to different soil conditions when searching for host nymphs. Field studies and laboratory experiments showed that soil acidity plays a major role in the nematode's ability to parasitize Cephalcia nymphs. Under field conditions in Picea abies forests positive correlations between soil pH and both nematode density and insects parasitized were found. Acidic soil with pH levels below 4.0 may limit the nematode's host-finding. Controlled experiments in the laboratory under different pH conditions confirmed these correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335803
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