Sean M Richards

Summary

Affiliation: University of Tennessee at Chattanooga
Country: USA

Publications

  1. ncbi request reprint Physical effects of chlorpyrifos on two stages of xenopus laevis
    Sean M Richards
    Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, USA
    J Toxicol Environ Health A 66:75-91. 2003
  2. ncbi request reprint A toxicity and hazard assessment of fourteen pharmaceuticals to Xenopus laevis larvae
    Sean M Richards
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
    Ecotoxicology 15:647-56. 2006
  3. ncbi request reprint Effects of pharmaceutical mixtures in aquatic microcosms
    Sean M Richards
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, Chattanooga, Tennessee 37403, USA
    Environ Toxicol Chem 23:1035-42. 2004
  4. ncbi request reprint Biochemical effects of chlorpyrifos on two developmental stages of Xenopus laevis
    Sean M Richards
    The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, Lubbock 79409 1163, USA
    Environ Toxicol Chem 21:1826-35. 2002
  5. doi request reprint Spatial and temporal analysis of pharmaceutical concentrations in the upper Tennessee River basin
    Justin M Conley
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, 615 McCallie Avenue, Chattanooga, TN 37403, USA
    Chemosphere 73:1178-87. 2008
  6. doi request reprint Rapid liquid chromatography-tandem mass spectrometry method for the determination of a broad mixture of pharmaceuticals in surface water
    Justin M Conley
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, 615 McCallie Avenue, Chattanooga, TN 37403, USA
    J Chromatogr A 1185:206-15. 2008
  7. ncbi request reprint Aquatic ecotoxicology of fluoxetine
    Bryan W Brooks
    Institute of Applied Sciences, University of North Texas, Denton, TX, USA
    Toxicol Lett 142:169-83. 2003
  8. ncbi request reprint Effects of 25 pharmaceutical compounds to Lemna gibba using a seven-day static-renewal test
    Richard A Brain
    Centre for Toxicology, Department of Environmental Biology, Bovey Administrative Building, University of Guelph, Guelph, Ontario N1G 2W1, Canada
    Environ Toxicol Chem 23:371-82. 2004
  9. ncbi request reprint Microcosm evaluation of the effects of an eight pharmaceutical mixture to the aquatic macrophytes Lemna gibba and Myriophyllum sibiricum
    Richard A Brain
    Department of Environmental Biology, Centre for Toxicology, University of Guelph, Guelph, Ont, N1G 2W1, Canada
    Aquat Toxicol 70:23-40. 2004
  10. ncbi request reprint Aquatic persistence of eight pharmaceuticals in a microcosm study
    Monica W Lam
    Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario M5S 3H6, Canada
    Environ Toxicol Chem 23:1431-40. 2004

Research Grants

Detail Information

Publications10

  1. ncbi request reprint Physical effects of chlorpyrifos on two stages of xenopus laevis
    Sean M Richards
    Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, USA
    J Toxicol Environ Health A 66:75-91. 2003
    ..The corresponding body mass was not affected until exposure to 0.1 mg/L. Based on recent environmental data, chlorpyrifos has a 0.1-32.8% probability of exceeding a 96-h time-weighted average of 0.0001 mg/L in U.S. surface waters...
  2. ncbi request reprint A toxicity and hazard assessment of fourteen pharmaceuticals to Xenopus laevis larvae
    Sean M Richards
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
    Ecotoxicology 15:647-56. 2006
    ..Thus, based on the data from the present study, concentrations of individual pharmaceuticals currently detected in surface water are far below concentrations of effective and lethal concentrations...
  3. ncbi request reprint Effects of pharmaceutical mixtures in aquatic microcosms
    Sean M Richards
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, Chattanooga, Tennessee 37403, USA
    Environ Toxicol Chem 23:1035-42. 2004
    ..Although the present data do not suggest that ibuprofen, fluoxetine, and ciprofloxacin are individually causing adverse effects in surface-water environments, questions remain about additive responses from mixtures...
  4. ncbi request reprint Biochemical effects of chlorpyrifos on two developmental stages of Xenopus laevis
    Sean M Richards
    The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, Lubbock 79409 1163, USA
    Environ Toxicol Chem 21:1826-35. 2002
    ..Metamorph protein concentration was significantly decreased at 1.0 mg/L. Based on current surface water data, the most sensitive effect would not have a high probability (< or = 4.2%) of occurring in the environment...
  5. doi request reprint Spatial and temporal analysis of pharmaceutical concentrations in the upper Tennessee River basin
    Justin M Conley
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, 615 McCallie Avenue, Chattanooga, TN 37403, USA
    Chemosphere 73:1178-87. 2008
    ..In addition, individual pharmaceuticals displayed positive correlation between surface and subsurface samples and negative correlation with downstream distance from the headwaters...
  6. doi request reprint Rapid liquid chromatography-tandem mass spectrometry method for the determination of a broad mixture of pharmaceuticals in surface water
    Justin M Conley
    Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga, 615 McCallie Avenue, Chattanooga, TN 37403, USA
    J Chromatogr A 1185:206-15. 2008
    ..This study reports the first detection of lovastatin in surface water...
  7. ncbi request reprint Aquatic ecotoxicology of fluoxetine
    Bryan W Brooks
    Institute of Applied Sciences, University of North Texas, Denton, TX, USA
    Toxicol Lett 142:169-83. 2003
    ....
  8. ncbi request reprint Effects of 25 pharmaceutical compounds to Lemna gibba using a seven-day static-renewal test
    Richard A Brain
    Centre for Toxicology, Department of Environmental Biology, Bovey Administrative Building, University of Guelph, Guelph, Ontario N1G 2W1, Canada
    Environ Toxicol Chem 23:371-82. 2004
    ..Wet mass was consistently the most sensitive endpoint above 100 microg/L; conversely, frond number was the most sensitive below 100 microg/L. Pigment endpoints were significantly less sensitive than growth endpoints...
  9. ncbi request reprint Microcosm evaluation of the effects of an eight pharmaceutical mixture to the aquatic macrophytes Lemna gibba and Myriophyllum sibiricum
    Richard A Brain
    Department of Environmental Biology, Centre for Toxicology, University of Guelph, Guelph, Ont, N1G 2W1, Canada
    Aquat Toxicol 70:23-40. 2004
    ..sibiricum exposed to similar mixtures of pharmaceutical compounds. For M. sibiricum and L. gibba, respective minimum differences of 5 and 1%, were detectable, however, these effect sizes are not considered ecologically significant...
  10. ncbi request reprint Aquatic persistence of eight pharmaceuticals in a microcosm study
    Monica W Lam
    Department of Chemistry, University of Toronto, 80 St George Street, Toronto, Ontario M5S 3H6, Canada
    Environ Toxicol Chem 23:1431-40. 2004
    ..Observed photoproducts of several of the pharmaceuticals remained photoreactive, which led to further degradation in irradiated surface waters...

Research Grants1

  1. PAH/Metal exposure and effects assessment in Chattanooga
    Sean Richards; Fiscal Year: 2004
    ..5) Quantify the potential for the residents of South Chattanooga to be exposed and affected by PAHs and metals present in area soil by using the data generated in this study in a probabilistic risk assessment. ..