John T. Creed

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BACKGROUND Speciation analysis is essential when evaluating risks from arsenic (As) exposure. In an oral exposure scenario, the importance of presystemic metabolism by gut microorganisms has been evidenced with in vivo animal models and in vitro experiments with animal microbiota. However, it is unclear whether human microbiota display similar As(More)
Acknowledgments Method 1640 was prepared under the direction of William A. Telliard of the U.S. Environmental Protection Agency's (EPA's) Office of Water (OW), Engineering and Analysis Division (EAD). In addition, the following personnel at the EPA Office of Research and Development's Environmental Monitoring Systems Laboratory in Cincinnati, Ohio, are(More)
The impacts on forests of tree-killing bark beetles can depend on the species composition of potential host trees. Host susceptibility might be an intrinsic property of tree species, or it might depend on spatial patterning of alternative host species. We compared the susceptibility of loblolly pine (Pinus taeda) and Virginia pine (P. virginiana) to(More)
  • Shier Berman, Paul Boothe, Gary Steinmetz, Russell Flegal, Carl Watras, Herb Windom +7 others
  • 2000
Acknowledgements Method 1638 was prepared under the direction of William A. Telliard of the U.S. Environmental Protection Agency's (EPA's) Office of Water (OW), Engineering and Analysis Division (EAD). The method was prepared under EPA Contract 68–C3–0337 by the DynCorp Environmental Programs Division with assistance from Interface, Inc. In addition, the(More)
Acknowledgments Method 1639 was prepared under the direction of William A. Telliard of the U.S. Environmental Protection Agency's (EPA's) Office of Water (OW), Engineering and Analysis Division (EAD). The following researchers in marine chemistry contributed to the philosophy behind this method. Their contribution is gratefully acknowledged. gratefully(More)
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