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441.
442.
Maria Bokern Petra Raid Hans Harms 《Environmental science and pollution research international》1998,5(1):21-27
4-Nonylphenol, a compound with estrogenic activity, has been shown to occur in sewage sludges and effluents of sludge treatment.
This, as well as its use in the formulation of pesticides, may result in the contamination of crop plants and may therefore
have an impact on the quality of food or feedstuff. The toxicity, uptake and metabolism of 4-n-nonylphenol (4-n-NP) were investigated as14C-labeled 4-n-NP in root cultures under septical and aseptical conditions and with intact plants grown in containers with soil and aseptically
grown in nutrient media. 4-n-NP was toxic to all plant systems tested. The presence of microorganisms and the developmental state of the plant material
appeared to have an influence on the EC50 values. 4-n-NP was taken up by the roots and a metabolism to polar compounds was observed in the cases where sufficiently high uptake
rates. With intact plants a transport from roots to the shoots was evident. Metabolism in roots changed quantitatively in
the presence of microorganisms. The mineralization of 4-n-NP to14CO2 only occurred with microorganisms. 相似文献
443.
444.
CHENG Jin-ping ZHANG Lan-ying WANG Wen-hu YANG Yi-chen ZHENG Min JU Su-wei 《环境科学学报(英文版)》2004,16(6):894-897
A strain saccharomycete STSM-I with high flocculanting activity was isolated from activated sludge with conventional methods.The high production rate and the low cost STSM-I medium was obtained by selecting different kinds of media, carbon source, nitrogen source and inorganic salt ion. The best flocculant-producing conditions were found by changing medium initial pH, culture temperature and ventilation flow. The best flocculating effect was obtained by changing positive ion types, density and concentration of flocculant. 相似文献
445.
Framework for integrating indigenous and scientific knowledge for disaster risk reduction 总被引:2,自引:0,他引:2
A growing awareness of the value of indigenous knowledge has prompted calls for its use within disaster risk reduction. The use of indigenous knowledge alongside scientific knowledge is increasingly advocated but there is as yet no clearly developed framework demonstrating how the two may be integrated to reduce community vulnerability to environmental hazards. This paper presents such a framework, using a participatory approach in which relevant indigenous and scientific knowledge may be integrated to reduce a community's vulnerability to environmental hazards. Focusing on small island developing states it presents an analysis of the need for such a framework alongside the difficulties of incorporating indigenous knowledge. This is followed by an explanation of the various processes within the framework, drawing on research completed in Papua New Guinea. This framework is an important first step in identifying how indigenous and scientific knowledge may be integrated to reduce community vulnerability to environmental hazards. 相似文献