R Williams

Summary

Affiliation: U.S. Environmental Protection Agency
Country: USA

Publications

  1. doi request reprint The influence of human and environmental exposure factors on personal NO(2) exposures
    Ron Williams
    US Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Sci Environ Epidemiol 22:109-15. 2012
  2. pmc Impact of personal and ambient-level exposures to nitrogen dioxide and particulate matter on cardiovascular function
    Ron Williams
    National Exposure Research Laboratory, U S Environmental Protection Agency US EPA, Research Triangle Park, NC, USA
    Int J Environ Health Res 22:71-91. 2012
  3. pmc Mechanistic indicators of childhood asthma (MICA) study: piloting an integrative design for evaluating environmental health
    Jane Gallagher
    National Health and Environmental Effects Research Laboratory, U S Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA
    BMC Public Health 11:344. 2011
  4. doi request reprint The design and field implementation of the Detroit Exposure and Aerosol Research Study
    Ron Williams
    National Exposure Research Laboratory, US Environmental Protection Agency, MD E 204 05, Research Triangle Park, NC 27711, USA
    J Expo Sci Environ Epidemiol 19:643-59. 2009
  5. ncbi request reprint The 1998 Baltimore Particulate Matter Epidemiology-Exposure Study: part 2. Personal exposure assessment associated with an elderly study population
    R Williams
    US Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 10:533-43. 2000
  6. ncbi request reprint The 1998 Baltimore Particulate Matter Epidemiology-Exposure Study: part 1. Comparison of ambient, residential outdoor, indoor and apartment particulate matter monitoring
    R Williams
    US Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 10:518-32. 2000
  7. ncbi request reprint Comparison of PM2.5 and PM10 monitors
    R Williams
    U S Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 10:497-505. 2000
  8. ncbi request reprint Particulate matter and heart rate variability among elderly retirees: the Baltimore 1998 PM study
    J Creason
    National Health and Environmental Effects Research Laboratory, US EPA, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 11:116-22. 2001
  9. ncbi request reprint Air pollution exposure-DNA adduct dosimetry in humans and rodents: evidence for non-linearity at high doses
    J Lewtas
    Human Studies Division, National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA
    Mutat Res 378:51-63. 1997
  10. pmc Constructing common cohorts from trials with overlapping eligibility criteria: implications for comparing effect sizes between trials
    David L Mount
    Wake Forest University School of Medicine, Winston Salem, NC, USA
    Clin Trials 6:416-29. 2009

Detail Information

Publications10

  1. doi request reprint The influence of human and environmental exposure factors on personal NO(2) exposures
    Ron Williams
    US Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Sci Environ Epidemiol 22:109-15. 2012
    ..44) or non-heating seasons (r=0.34) were observed, indicating that use of ambient-based monitoring as a surrogate of personal exposure might result in sizeable exposure misclassification...
  2. pmc Impact of personal and ambient-level exposures to nitrogen dioxide and particulate matter on cardiovascular function
    Ron Williams
    National Exposure Research Laboratory, U S Environmental Protection Agency US EPA, Research Triangle Park, NC, USA
    Int J Environ Health Res 22:71-91. 2012
    ..Personal NO(2) exposures resulted in significant changes in BAD (e.g., 0.0041 mm/ppb ± 0.0019, p = 0.0353, lag day 1) and FMD (0.0612 ± 0.0235, p = 0.0103, lag day 0) among other findings...
  3. pmc Mechanistic indicators of childhood asthma (MICA) study: piloting an integrative design for evaluating environmental health
    Jane Gallagher
    National Health and Environmental Effects Research Laboratory, U S Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA
    BMC Public Health 11:344. 2011
    ....
  4. doi request reprint The design and field implementation of the Detroit Exposure and Aerosol Research Study
    Ron Williams
    National Exposure Research Laboratory, US Environmental Protection Agency, MD E 204 05, Research Triangle Park, NC 27711, USA
    J Expo Sci Environ Epidemiol 19:643-59. 2009
    ..This paper fully describes the design of the DEARS and the approach used to implement this field monitoring study and reports select preliminary findings...
  5. ncbi request reprint The 1998 Baltimore Particulate Matter Epidemiology-Exposure Study: part 2. Personal exposure assessment associated with an elderly study population
    R Williams
    US Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 10:533-43. 2000
    ..1 microg/m3 was estimated. Data collected from these participants may be unique with respect to the general elderly population due to the communal lifestyle within the facility and reported low frequency of exposure to sources of PM...
  6. ncbi request reprint The 1998 Baltimore Particulate Matter Epidemiology-Exposure Study: part 1. Comparison of ambient, residential outdoor, indoor and apartment particulate matter monitoring
    R Williams
    US Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 10:518-32. 2000
    ..Results associated with the personal monitoring effort are discussed in depth in Part 2 of this article...
  7. ncbi request reprint Comparison of PM2.5 and PM10 monitors
    R Williams
    U S Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 10:497-505. 2000
    ..5 monitors (PEM) provided mass concentration data that were statistically different from that produced by a protoype PM2.5 FRM sampler. The PEM had a positive mass concentration bias ranging up to 18% relative to the FRM prototype...
  8. ncbi request reprint Particulate matter and heart rate variability among elderly retirees: the Baltimore 1998 PM study
    J Creason
    National Health and Environmental Effects Research Laboratory, US EPA, Research Triangle Park, North Carolina 27711, USA
    J Expo Anal Environ Epidemiol 11:116-22. 2001
    ..This study is consistent with earlier findings that exposures to PM2.5 are associated with decreased HRV in the elderly...
  9. ncbi request reprint Air pollution exposure-DNA adduct dosimetry in humans and rodents: evidence for non-linearity at high doses
    J Lewtas
    Human Studies Division, National Health and Environmental Effects Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA
    Mutat Res 378:51-63. 1997
    ..Regardless of the mechanism, this decrease in the DNA-binding potency at moderate to high doses of PAH has important implications for dose-response extrapolation in risk assessment...
  10. pmc Constructing common cohorts from trials with overlapping eligibility criteria: implications for comparing effect sizes between trials
    David L Mount
    Wake Forest University School of Medicine, Winston Salem, NC, USA
    Clin Trials 6:416-29. 2009
    ..Comparing findings from separate trials is necessary to choose among treatment options, however differences among study cohorts may impede these comparisons...