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Title: Physiological Basis for Prompt Health Effects

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United States

Citation Formats

VINCENT, Andrew. Physiological Basis for Prompt Health Effects. United States: N. p., 2006. Web.
VINCENT, Andrew. Physiological Basis for Prompt Health Effects. United States.
VINCENT, Andrew. Fri . "Physiological Basis for Prompt Health Effects". United States. doi:.
title = {Physiological Basis for Prompt Health Effects},
author = {VINCENT, Andrew},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Apr 21 00:00:00 EDT 2006},
month = {Fri Apr 21 00:00:00 EDT 2006}

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  • Exposure of rats and mice to 60-Hz electric fields at 100 kV/m for up to 120 days had no statistically significant, reproducible effects on a number of measures of metabolic status and growth, bone growth and structure, reproduction, hematology and serum chemistry, endocrinology, cardiovascular function, nerve function, or organ and tissue morphology. An effect on cell-mediated immunity was detected and is being evaluated further in additional experiments. Exposure of rats in utero (day 0 of gestation to 8 days of age) had a transient effect at 14 days of age on motile behavior and development of the righting reflex. Significantmore » effects were observed in synaptic transmission and behavior. Exposure to 60-Hz electric fields may increase the excitability of the nervous system of rats. Experiments are in progress to obtain a better understanding of these effects and their potential consequences.« less
  • The detection of possible forest growth responses to changes in atmospheric CO/sub 2/ or air pollutants is very difficult by statistical analysis of tree ring chronologies, and a complementary modeling approach has been initially tested. In this new approach, a linked set of mechanistic transport models of carbon, water, and chemical dynamics in soil-plant-litter systems (UTM) is used to generate a matrix of simulated annual stem-wood increment and winter carbon storage values for a range of degree day, water stress, and atmospheric CO/sub 2/ concentrations. These values represent potential tree growth responses as determined by hourly time-step physiological processes. Themore » matrix is accessed by a forest succession model (FORET) according to selected degree day and water stress values or by use of actual site data. These potential growth responses are modified to realized annual increments according to the competition algorithms of the succession simulator using yearly time steps. A 12% increase in stem-wood production was predicted for an oak-hickory (Quercus-Carya spp.) forest in eastern Tennessee by the UTM for both a change in atmospheric CO/sub 2/ from 260 to 340 and from 340 to 600« less
  • A sequence of field studies to evaluate causes of decreasing radial growth rates of red spruce at high elevations in the Great Smokey Mountains during the past 30 years has examined climatic signals, competition, xylem wood chemistry, soil chemistry, foliar nutrition and carbon allocation patterns. The resultant hypothesis that acid deposition alters red spruce growth through limiting calcium availability, and consequently net carbon assimilation, has now been tested in controlled greenhouse and field studies. Recent measurements of reduce respiration and increased photosynthesis of red spruce samplings in response to adding calcium in the field, provides additional evidence linking acid depositionmore » to altered nutrition, physiology, and growth of red spruce. Initial data from physiological gradient analysis also support the occurrence of parallel elevational gradients in physiology of fraser fir.« less