P225 Does ELISA accurately estimate the levels of toxaphene in contaminated schoolyard soils? Fröhlich, Marco1, Maruya, Keith*,2, 1 Fachhochschule Mannheim, Mannheim, Germany, Germany2 Skidaway Institute of Oceanography, Savannah, GA, USA

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P226 The thickness of digestive gland epithelium as a biomarker of stress in the terrestrial isopod Porcellio scaber. Drobne, Damjana*,1, Drobne, Samo2, Strus, Jasna1, Vilhar, Barbara1, 1 Department of Biology, University of Ljubljana, Ljubljana, SLOVENIA2 Faculty of Civil and Geodetic engineering, University of Ljubljana, Ljubljana, SLOVENIA

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P227 Laboratory and field methods to use terrestrial snail as bioindicator of pollution. Coeurdassier, Michael*,1, De Vaufleury, Annette1, Badot, Pierre-Marie1, 1 University of Franche-Comte. Department of Biology and Ecophysiology-USC INRA., Besancon cedex, France

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P228 Aquatic and Soil Toxicity Testing Using Three Free-Living Nematode Species. Boyd, Windy*,1, Williams, Phillip1, 1 University of Georgia, Athens, GA, USA

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P229 Development of bioassays for Bt corn (Zea mays). Clark, Bryan*,1, Phillips, Todd1, Coats, Joel1, 1 Iowa State University, Ames, Iowa, USA

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P230 The predictive relationship between avoidance behaviour and reproductive effects in earthworms. Stephenson, Gladys1, Feisthauer, Natalie*,1, Elshayeb, Monalisa2, Scroggins, Richard3, 1 ESG International, Inc., Guelph, Ontario, Canada2 University of Guelph, Guelph, Ontario, Canada3 Environment Canada, Ottawa, Ontario, Canada

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P231 Evaluation of Soil Performance with Novel Drilling Fluid and Treatment Systems. Rabke, Stephen*,1, Leuterman, Arthur1, Candler, John1, 1 M-I L.L.C., Houston, TX, USA

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P232 Effect of bioremediation on toxicity of crude oil-contaminated soils in Pennsylvania. Edenborn, Harry*,1, Garvin, Rebecca1, Provins, Rachel1, Zenone, Vincent2, 1 National Energy Technology Laboratory, U.S. Dept. of Energy, Pittsburgh, PA, USA2 U.S. EPA Region III, Bradford, PA, USA

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P233 The Effects of Perchlorate on Earthworm Survival and Reproductive Success. Anderson, Todd1, Landrum, Mindy*,1, 1 The Institute of Environmental and Human Health, Lubbock, Texas, USA

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P234 Long-term toxicity of motor gasoline to earthworms in soil: implications of sequestration and bioavailability. Princz, Juliska*,1, Stephenson, Gladys1, Feisthauer, Natalie2, Solomon, Keith1, Miasek, Peter3, 1 University of Guelph, Guelph, Ontario, Canada2 ESG International Inc., Guelph, Ontario, Canada3 Imperial Oil, North York, Ontario, Canada

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P235 Oral bioavailability of environmental contaminants assessed using Caco-2 monolayers. Vasiluk, Luba*,1, Moore, Margo1, 1 Simon Fraser University, Burnaby, BC, Canada

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