Now showing items 21-30 of 41
Dissolution of wollastonite during the experimental manipulation of Hubbard Brook Watershed 1
(Kluwer Academic Publishers; Springer Science+Business Media, 2004-02)
Powdered and pelletized wollastonite (CaSiO 3 ) was applied to an 11.8 ha forested watershed at the Hubbard Brook Experimental Forest (HBEF) in northern New Hampshire, U.S.A. during October of 1999. The dissolution of ...
Long-term Atmospheric Mercury Wet Deposition at Underhill, Vermont
(Kluwer Academic Publishers; Springer Science+Business Media, Inc., 2005-03)
Section 112(m) of the 1990 Clean Air Act Amendments, referred to as the Great Waters Program, mandated an assessment of atmospheric deposition of hazardous air pollutants (HAPs) to Lake Champlain. Mercury (Hg) was listed ...
Determining the sources of calcium for migratory songbirds using stable strontium isotopes
(Springer-Verlag, 2001-02)
We investigated natural variations in the stable isotopic composition of strontium (a surrogate for calcium) in the bones of a single species of breeding migratory songbird, as well as in their eggshells, egg contents, and ...
Intestinal infection with Mycobacterium avium in acquired immune deficiency syndrome (AIDS)
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1985-05)
At endoscopy, a 30-year-old man with acquired immune deficiency syndrome (AIDS), Kaposi's sarcoma, diarrhea, and unexplained malabsorption showed erythematous macular duodenal lesions consistent with Whipple's disease by ...
Fine root chemistry and decomposition in model communities of north-temperate tree species show little response to elevated atmospheric CO 2 and varying soil resource availability
(Springer-Verlag, 2005-12)
Rising atmospheric [CO 2 ] has the potential to alter soil carbon (C) cycling by increasing the content of recalcitrant constituents in plant litter, thereby decreasing rates of decomposition. Because fine root turnover ...
Microbial community composition and function beneath temperate trees exposed to elevated atmospheric carbon dioxide and ozone
(Springer-Verlag, 2002-04)
We hypothesized that changes in plant growth resulting from atmospheric CO 2 and O 3 enrichment would alter the flow of C through soil food webs and that this effect would vary with tree species. To test this idea, we ...
The sources of aerosol elemental carbon at Allegheny Mountain
(Elsevier, 1990)
Aerosol elemental carbon measurements were taken at two rural sites in southwestern Pennsylvania during August 1983. Carbon, though a small part of the aerosol mass at both sites, was a leading constituent of the aerosol ...
Microbial Community Structure and Oxidative Enzyme Activity in Nitrogen-amended North Temperate Forest Soils
(Springer-Verlag; Spreinger-Verlag, 2004-10)
Large regions of temperate forest are subject to elevated atmospheric nitrogen (N) deposition which can affect soil organic matter dynamics by altering mass loss rates, soil respiration, and dissolved organic matter ...
Extracellular Enzyme Activities and Soil Organic Matter Dynamics for Northern Hardwood Forests receiving Simulated Nitrogen Deposition
(Kluwer Academic Publishers; Springer, 2005-08)
Anthropogenic nitrogen enrichment alters decomposition processes that control the flux of carbon (C) and nitrogen (N) from soil organic matter (SOM) pools. To link N-driven changes in SOM to microbial responses, we measured ...
Community Action Against Asthma
(Blackwell Science Inc, 2003-07)
Community Action Against Asthma (CAAA) is a community-based participatory research (CBPR) project that assesses the effects of outdoor and indoor air quality on exacerbation of asthma in children, and tests household- and ...