Roger Gibson

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Changes in vegetation from 1990 to 2000 were examined at 10 high country localities, representing four grassland types: fescue tussock (Festuca novae-zelandiae), snow tussock (Chionochloa rigida), red tussock (C. rubra), and silver tussock (Poa cita). At each locality, three treatments were established: ambient sheep+rabbit grazing, rabbit grazing only, and(More)
Benzene, naphthalene, and 1- and 2-naphthol were measured in urine samples obtained from 322 U.S. Air Force personnel categorized a priori as likely to have low, moderate, or high exposure to jet fuel [jet propulsion fuel-8 (JP-8)]. In postexposure samples, levels of these analytes in the high-exposure group were 3- to 29-fold greater than in the(More)
BACKGROUND Jet propulsion fuel-8 (JP-8) is one of the largest sources of chemical exposures among Air Force personnel. Urinary naphthols have been suggested as useful biomarkers of exposure to JP-8. METHODS Multivariate linear regression models were applied to evaluate the effects of environmental and work-related factors upon production of urinary(More)
Jet fuel is a common occupational exposure among commercial and military maintenance workers. JP-8 jet fuel, a military formulation, has shown immunotoxic effects in mice, but little data exist for humans. The aim of this cross-sectional study was to determine whether immune cell counts in the peripheral blood were altered among tank entry workers at three(More)
BACKGROUND Missouri is an agriculturally intensive state, primarily growing corn and soybeans with additional rice and cotton farming in some southeastern counties. Communities located in close proximity to pesticide-treated fields are known to have increased exposure to pesticides and may be at increased risk of adverse birth outcomes. The study aims were(More)
It would be ever so nice if there were a viable analytic/synthetic distinction. Though nobody knows for sure, there would seem to be several major philosophical projects that having one would advance. For example: analytic sentences are supposed to have their truth values solely in virtue of the meanings (together with the syntactic arrangement) of their(More)
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