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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 31 to 40 of 47 (0.442 seconds)| 31 |
Ecotoxicity assessment of Zn, Cu and Ni in contrasting soils using test organisms of different ecological nichesUddin Miah, Md. Ramiz January 2002 (has links)
It was illustrated that Zn and Cu at or above 1000 and 800 mg kg<sup>-1</sup> respectively were highly toxic to the earthworm studied. Cu was found to be more toxic to the earthworm than Zn in respect to mortality, growth and reproduction parameters in all three different types of soils. The body burdens of earthworms exposed to metal amended soils increased corresponding to the increased concentrations of amended metals irrespective of soils used. It was found that the BCFs in earthworms decreased with the increased concentrations of metals in soils. The higher BCFs is the indication of uptake of higher proportion metals from soil by earthworms. The highest BCFs was found for Ni followed by Zn and Cu indicated their bioavailability to earthworms. The growth (weight) of the earthworms was most affected by Cu. The combined toxicity of Zn:Ni, Zn:Cu and Cu:Ni to reproduction (cocoon production) of earthworms was mainly antagonistic and to some extent additive in both the Insch and Boyndie soils. Zn was more toxic than Cu to the nematodes as the number of nematodes decreased with the increase of metal amendments to soil. It was also found that the number of nematodes increased at the exposure to some lower doses of Cu and Ni. The joint toxicity of Zn:Ni, Zn:Cu and Cu:Ni on the number of nematodes was mainly antagonistic in both the Insch and Boyndie soils. In some cases the combined toxicity of metals to nematodes was not possible to assess because the threshold level was not reached and also due to irregular and inconsistent data. Cruden Bay soil was more vulnerable than Insch and Boyndie soils in evaluating the toxicity of metals to nematodes. Zn was found to be toxic for the <i>lux</i>-marked bacterial biosensor <i>Escherichia coil</i> HB101 pUCD607 and <i>Pseudomonas fluorescens </i>10586r pUCD607 in different soils.
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Process-based modelling of river flow and nitrate loadings in the Ythan catchment, ScotlandJaafar, Noraini January 1998 (has links)
No description available.
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Trace pesticide analysis using immuno-based solid-phase extractionShahtaheri, Seyyed Jamaleddin January 1996 (has links)
No description available.
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The development of immunotechniques for environmental monitoring of pesticidesKatmeh, Mohamad Fawaz January 1994 (has links)
No description available.
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The toxicology and neurotoxicity of selected pyrethroid insecticides in Spodoptera littoralis (Boisd.)Broderick, Mark Philip January 1992 (has links)
No description available.
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Trace element associations in dredged canal sediments : implications for disposal of dredgings to landStephens, Samantha Rose January 2001 (has links)
No description available.
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Pesticide mobility in the unsaturated zoneWorrall, Jonathan Stewart James January 1995 (has links)
No description available.
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Environmental effects of rodenticide useCox, Paula R. January 1991 (has links)
No description available.
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The effects of processing on residues of the fungicide Imazalil on postharvest-treated cucurbitsScussel, Vildes Maria January 1995 (has links)
No description available.
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Uncertainty of geochemical measurements of contaminated land : causes, estimation and cost-based optimisationTaylor, Paul January 2003 (has links)
No description available.
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