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171.
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The determination and assessment of mixtures of different and complex indoor pollutants is difficult. This investigation was performed in order to determine the effects of pollutants closely bound to household-dust. The approach ist not the determination of single compounds but of all pollutants (sum parameter). For this reason a new method was developed with which househould dust samples are introduced in the Microtox®-Text System to quantify the effect of pollutants. Some of the methods tested revealed good results, however, further research and investigations on the basis of the data already obtained are necessary. 相似文献
173.
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175.
Walter Zimmermann 《Die Naturwissenschaften》1927,15(45):889-895
176.
Our ecological footprint analyses of coral reef fish fisheries and, in particular, the live reef fish food trade (FT), indicate many countries' current consumption exceeds estimated sustainable per capita global, regional and local coral reef production levels. Hong Kong appropriates 25% of SE Asia's annual reef fish production of 135 260-286 560 tonnes (t) through its FT demand, exceeding regional biocapacity by 8.3 times; reef fish fisheries demand out-paces sustainable production in the Indo-Pacific and SE Asia by 2.5 and 6 times. In contrast, most Pacific islands live within their own reef fisheries means with local demand at < 20% of total capacity in Oceania. The FT annually requisitions up to 40% of SE Asia's estimated reef fish and virtually all of its estimated grouper yields. Our results underscore the unsustainable nature of the FT and the urgent need for regional management and conservation of coral reef fisheries in the Indo-Pacific. 相似文献
177.
178.
Mario Gellrich Priska Baur Niklaus E. Zimmermann 《Environmental Modeling and Assessment》2007,12(4):269-278
In many European mountain regions, natural forest regrowth on abandoned agricultural land and the related consequences for
the environment are issues of increasing concern. We developed a spatial statistical model based on multiple geophysical and
socio-economic variables to investigate the pattern of natural forest regrowth in the Swiss mountain area between the 1980s
and 1990s. Results show that forest regrowth occurred primarily in areas with low temperature sum, intermediate steepness
and soil stoniness as well as close to forest edges and relatively close to roads. Model results suggest that regions with
weak labor markets are favored in terms of land abandonment and forest regrowth. We could not find an effect of population
change on land abandonment and forest regrowth. Therefore, we conclude that decision makers should consider non-linearities
in the pattern of forest regrowth and the fact that labor markets have an effect on land abandonment and forest regrowth when
designing measures to prevent agricultural land abandonment and natural forest regrowth in the Swiss mountains. 相似文献
179.
Ralf-Dieter Zimmermann Rosemarie Umlauff-Zimmermann 《Umweltwissenschaften und Schadstoff-Forschung》2000,12(6):307-309
Einführung Beitragsserie POPs
Persistente Organische Schadstoffe Persistent Organic Pollutants, POPs 相似文献180.
Bacterial antibiotic resistance levels in Danish farmland as a result of treatment with pig manure slurry 总被引:17,自引:0,他引:17
Sengeløv G Agersø Y Halling-Sørensen B Baloda SB Andersen JS Jensen LB 《Environment international》2003,28(7):587-595
Resistance to tetracycline, macrolides and streptomycin was measured for a period of 8 months in soil bacteria obtained from farmland treated with pig manure slurry. This was done by spread plating bacteria on selective media (Luria Bertani (LB) medium supplemented with antibiotics). To account for seasonal variations in numbers of soil bacteria, ratios of resistant bacteria divided by total count on nonselective plates were calculated. Soil samples were collected from four different farms and from a control soil on a fifth farm. The control soil was not amended with animal manure. The occurrence of tetracycline-resistant bacteria was elevated after spread of pig manure slurry but declined throughout the sampling period to a level corresponding to the control soil. Higher load of pig manure slurry yielded higher occurrence of tetracycline resistance after spreading; however, the tetracycline resistance declined to normal occurrence defined by the tetracycline resistance occurrence in the control soil. Concentrations of tetracycline in soil and in pig manure slurry were measured using HPLC. No tetracycline exceeding the detection limit was found in soil samples. Manure slurry concentrations of tetracycline for three of the farms were 42, 81 and 698 microg/l, respectively. For streptomycin and macrolides, only minor variations in resistance levels were detected. Results obtained in this study thus indicate that tetracycline resistance levels in soil are temporarily influenced by the addition of pig manure slurry. The results indicate also that increased amount of pig manure slurry amendment may result in increased levels of tetracycline resistance in the soil. 相似文献