The Experts below are selected from a list of 585 Experts worldwide ranked by ideXlab platform
K. E. Pettit - One of the best experts on this subject based on the ideXlab platform.
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Environmental contamination and developmental abnormalities in eggs and hatchlings of the common snapping turtle (Chelydra serpentina serpentina) from the Great Lakes-St Lawrence River basin (1989-1991).
Environmental pollution (Barking Essex : 1987), 1998Co-Authors: Christine A. Bishop, K. E. Pettit, Sean W. Kennedy, J.j. Stegeman, Ross J. Norstrom, R. J. BrooksAbstract:Abstract During 1989–1991, we assessed developmental abnormalities in embryos and hatchlings from eggs of the common snapping turtle (Chelydra serpentina serpentina). Eggs were collected and artificially incubated from eight sites in Ontario, Canada and Akwesasne/New York, USA. In eggs from the same clutches we measured 20 organochlorine pesticides, 48 Polychlorinated biphenyl (PCBs) congeners including 6 non-ortho PCBs, 8 Polychlorinated Dibenzodioxins (PCDDs), 14 Polychlorinated dibenzofurans (PCDFs) and total mercury. We found a significant increase in abnormal development with increasing Polychlorinated aromatic hydrocarbon exposure in eggs, particularly PCDD and PCDF concentrations. In contrast, the risk of abnormality was not significantly higher as toxic equivalent concentrations increased in eggs. We also found significant 7-ethoxyresorufin O-deethylase and Cytochrome P4501A responses in livers of hatchling turtles from Lake Ontario relative to hatchlings from a clean, inland site whereas we did not find any evidence of porphyria in the hatchlings from either site.
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temporal and geographic variation of organochlorine residues in eggs of the common snapping turtle chelydra serpentina serpentina 1981 1991 and comparisons to trends in the herring gull larus argentatus in the great lakes basin in ontario canada
Archives of Environmental Contamination and Toxicology, 1996Co-Authors: Christine A. Bishop, Ross J. Norstrom, R. J. Brooks, K. E. PettitAbstract:Common snapping turtle (Chelydra serpentina serpentina) eggs from five sites within the Great Lakes basin, and from a reference site in north-central Ontario were collected during 1981–1991 and analyzed for four organochlorine pesticides, Polychlorinated biphenyls (PCBs) including six non-ortho PCBs, Polychlorinated Dibenzodioxins (PCDDs), and Polychlorinated dibenzofurans (PCDFs). The pattern of geographic variation was consistent over time in eggs with Cootes Paradise/Hamilton Harbour and Lynde Creek eggs on Lake Ontario containing the highest concentrations and most PCDD and PCDF congeners among all sites. Eggs from Cranberry Marsh on Lake Ontario contained organochlorine concentrations similar to those from Big Creek Marsh and Rondeau Provincial Park on Lake Erie except PCDDs and PCDFs which occurred at higher concentrations and more congeners were detectable in Cranberry Marsh eggs.
Christine A. Bishop - One of the best experts on this subject based on the ideXlab platform.
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Environmental contamination and developmental abnormalities in eggs and hatchlings of the common snapping turtle (Chelydra serpentina serpentina) from the Great Lakes-St Lawrence River basin (1989-1991).
Environmental pollution (Barking Essex : 1987), 1998Co-Authors: Christine A. Bishop, K. E. Pettit, Sean W. Kennedy, J.j. Stegeman, Ross J. Norstrom, R. J. BrooksAbstract:Abstract During 1989–1991, we assessed developmental abnormalities in embryos and hatchlings from eggs of the common snapping turtle (Chelydra serpentina serpentina). Eggs were collected and artificially incubated from eight sites in Ontario, Canada and Akwesasne/New York, USA. In eggs from the same clutches we measured 20 organochlorine pesticides, 48 Polychlorinated biphenyl (PCBs) congeners including 6 non-ortho PCBs, 8 Polychlorinated Dibenzodioxins (PCDDs), 14 Polychlorinated dibenzofurans (PCDFs) and total mercury. We found a significant increase in abnormal development with increasing Polychlorinated aromatic hydrocarbon exposure in eggs, particularly PCDD and PCDF concentrations. In contrast, the risk of abnormality was not significantly higher as toxic equivalent concentrations increased in eggs. We also found significant 7-ethoxyresorufin O-deethylase and Cytochrome P4501A responses in livers of hatchling turtles from Lake Ontario relative to hatchlings from a clean, inland site whereas we did not find any evidence of porphyria in the hatchlings from either site.
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temporal and geographic variation of organochlorine residues in eggs of the common snapping turtle chelydra serpentina serpentina 1981 1991 and comparisons to trends in the herring gull larus argentatus in the great lakes basin in ontario canada
Archives of Environmental Contamination and Toxicology, 1996Co-Authors: Christine A. Bishop, Ross J. Norstrom, R. J. Brooks, K. E. PettitAbstract:Common snapping turtle (Chelydra serpentina serpentina) eggs from five sites within the Great Lakes basin, and from a reference site in north-central Ontario were collected during 1981–1991 and analyzed for four organochlorine pesticides, Polychlorinated biphenyls (PCBs) including six non-ortho PCBs, Polychlorinated Dibenzodioxins (PCDDs), and Polychlorinated dibenzofurans (PCDFs). The pattern of geographic variation was consistent over time in eggs with Cootes Paradise/Hamilton Harbour and Lynde Creek eggs on Lake Ontario containing the highest concentrations and most PCDD and PCDF congeners among all sites. Eggs from Cranberry Marsh on Lake Ontario contained organochlorine concentrations similar to those from Big Creek Marsh and Rondeau Provincial Park on Lake Erie except PCDDs and PCDFs which occurred at higher concentrations and more congeners were detectable in Cranberry Marsh eggs.
R. J. Brooks - One of the best experts on this subject based on the ideXlab platform.
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Environmental contamination and developmental abnormalities in eggs and hatchlings of the common snapping turtle (Chelydra serpentina serpentina) from the Great Lakes-St Lawrence River basin (1989-1991).
Environmental pollution (Barking Essex : 1987), 1998Co-Authors: Christine A. Bishop, K. E. Pettit, Sean W. Kennedy, J.j. Stegeman, Ross J. Norstrom, R. J. BrooksAbstract:Abstract During 1989–1991, we assessed developmental abnormalities in embryos and hatchlings from eggs of the common snapping turtle (Chelydra serpentina serpentina). Eggs were collected and artificially incubated from eight sites in Ontario, Canada and Akwesasne/New York, USA. In eggs from the same clutches we measured 20 organochlorine pesticides, 48 Polychlorinated biphenyl (PCBs) congeners including 6 non-ortho PCBs, 8 Polychlorinated Dibenzodioxins (PCDDs), 14 Polychlorinated dibenzofurans (PCDFs) and total mercury. We found a significant increase in abnormal development with increasing Polychlorinated aromatic hydrocarbon exposure in eggs, particularly PCDD and PCDF concentrations. In contrast, the risk of abnormality was not significantly higher as toxic equivalent concentrations increased in eggs. We also found significant 7-ethoxyresorufin O-deethylase and Cytochrome P4501A responses in livers of hatchling turtles from Lake Ontario relative to hatchlings from a clean, inland site whereas we did not find any evidence of porphyria in the hatchlings from either site.
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temporal and geographic variation of organochlorine residues in eggs of the common snapping turtle chelydra serpentina serpentina 1981 1991 and comparisons to trends in the herring gull larus argentatus in the great lakes basin in ontario canada
Archives of Environmental Contamination and Toxicology, 1996Co-Authors: Christine A. Bishop, Ross J. Norstrom, R. J. Brooks, K. E. PettitAbstract:Common snapping turtle (Chelydra serpentina serpentina) eggs from five sites within the Great Lakes basin, and from a reference site in north-central Ontario were collected during 1981–1991 and analyzed for four organochlorine pesticides, Polychlorinated biphenyls (PCBs) including six non-ortho PCBs, Polychlorinated Dibenzodioxins (PCDDs), and Polychlorinated dibenzofurans (PCDFs). The pattern of geographic variation was consistent over time in eggs with Cootes Paradise/Hamilton Harbour and Lynde Creek eggs on Lake Ontario containing the highest concentrations and most PCDD and PCDF congeners among all sites. Eggs from Cranberry Marsh on Lake Ontario contained organochlorine concentrations similar to those from Big Creek Marsh and Rondeau Provincial Park on Lake Erie except PCDDs and PCDFs which occurred at higher concentrations and more congeners were detectable in Cranberry Marsh eggs.
Jeanfrancois Focant - One of the best experts on this subject based on the ideXlab platform.
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new strategy for comprehensive analysis of polybrominated diphenyl ethers Polychlorinated dibenzo p dioxins Polychlorinated dibenzofurans and Polychlorinated biphenyls by gas chromatography coupled with mass spectrometry
Journal of Chromatography A, 2003Co-Authors: Catherine Pirard, Edwin De Pauw, Jeanfrancois FocantAbstract:A strategy for determination of polybrominated diphenyl ethers, Polychlorinated Dibenzodioxins, Polychlorinated dibenzofurans and Polychlorinated biphenyls on fatty matrices has been established. After extraction, the proposed method allows the purification and the fractionation of all target groups of compounds in a simple multi-step automated clean-up. Furthermore, their subsequent analysis is carried out using a single benchtop mass spectrometer, in four separate injections. Required sensitivity considering levels found in the environment is attained using electron impact ionisation followed by tandem in time mass spectrometry. The whole method has been evaluated on standard solution and quality control samples consisting of fortified beef fat. Sensitivity, selectivity, accuracy and repeatability were tested with satisfactory results.
Ross J. Norstrom - One of the best experts on this subject based on the ideXlab platform.
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Environmental contamination and developmental abnormalities in eggs and hatchlings of the common snapping turtle (Chelydra serpentina serpentina) from the Great Lakes-St Lawrence River basin (1989-1991).
Environmental pollution (Barking Essex : 1987), 1998Co-Authors: Christine A. Bishop, K. E. Pettit, Sean W. Kennedy, J.j. Stegeman, Ross J. Norstrom, R. J. BrooksAbstract:Abstract During 1989–1991, we assessed developmental abnormalities in embryos and hatchlings from eggs of the common snapping turtle (Chelydra serpentina serpentina). Eggs were collected and artificially incubated from eight sites in Ontario, Canada and Akwesasne/New York, USA. In eggs from the same clutches we measured 20 organochlorine pesticides, 48 Polychlorinated biphenyl (PCBs) congeners including 6 non-ortho PCBs, 8 Polychlorinated Dibenzodioxins (PCDDs), 14 Polychlorinated dibenzofurans (PCDFs) and total mercury. We found a significant increase in abnormal development with increasing Polychlorinated aromatic hydrocarbon exposure in eggs, particularly PCDD and PCDF concentrations. In contrast, the risk of abnormality was not significantly higher as toxic equivalent concentrations increased in eggs. We also found significant 7-ethoxyresorufin O-deethylase and Cytochrome P4501A responses in livers of hatchling turtles from Lake Ontario relative to hatchlings from a clean, inland site whereas we did not find any evidence of porphyria in the hatchlings from either site.
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temporal and geographic variation of organochlorine residues in eggs of the common snapping turtle chelydra serpentina serpentina 1981 1991 and comparisons to trends in the herring gull larus argentatus in the great lakes basin in ontario canada
Archives of Environmental Contamination and Toxicology, 1996Co-Authors: Christine A. Bishop, Ross J. Norstrom, R. J. Brooks, K. E. PettitAbstract:Common snapping turtle (Chelydra serpentina serpentina) eggs from five sites within the Great Lakes basin, and from a reference site in north-central Ontario were collected during 1981–1991 and analyzed for four organochlorine pesticides, Polychlorinated biphenyls (PCBs) including six non-ortho PCBs, Polychlorinated Dibenzodioxins (PCDDs), and Polychlorinated dibenzofurans (PCDFs). The pattern of geographic variation was consistent over time in eggs with Cootes Paradise/Hamilton Harbour and Lynde Creek eggs on Lake Ontario containing the highest concentrations and most PCDD and PCDF congeners among all sites. Eggs from Cranberry Marsh on Lake Ontario contained organochlorine concentrations similar to those from Big Creek Marsh and Rondeau Provincial Park on Lake Erie except PCDDs and PCDFs which occurred at higher concentrations and more congeners were detectable in Cranberry Marsh eggs.