Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16727
Laboratory comparison of polyethylene and dialysis membrane diffusion samplers Laboratory comparison of polyethylene and dialysis membrane diffusion samplers
The ability of diffusion samplers constructed from regenerated cellulose dialysis membrane and low density, lay flat polyethylene tubing to collect volatile organic compounds and inorganic ions was compared in a laboratory study. Concentrations of vinyl chloride, cis‐1, 2‐dichloroethene, bromochloromethane, trichloroethene, bromodichloromethane, and tetrachloroethene collected by both...
Authors
Theodore A. Ehlke, Thomas E. Imbrigiotta, Jeffrey M. Dale
The late cretaceous Donlin Creek gold deposit, Southwestern Alaska: Controls on epizonal ore formation The late cretaceous Donlin Creek gold deposit, Southwestern Alaska: Controls on epizonal ore formation
The Donlin Creek gold deposit, southwestern Alaska, has an indicated and inferred resource of approximately 25 million ounces (Moz) Au at a cutoff grade of 1.5 g/t. The ca. 70 Ma deposit is hosted in the Late Cretaceous Kuskokwim flysch basin, which developed in the back part of the arc region of an active continental margin, on previously accreted oceanic terranes and continental...
Authors
Richard J. Goldfarb, Robert A. Ayuso, Marti L. Miller, Shane W. Ebert, Erin E. Marsh, Scott A. Petsel, Lance D. Miller, Dwight Bradley, Chad Johnson, William C. McClelland
Chronology of sediment deposition in Upper Klamath Lake, Oregon Chronology of sediment deposition in Upper Klamath Lake, Oregon
A combination of tephrochronology and 14C, 210Pb, and 137Cs measurements provides a robust chronology for sedimentation in Upper Klamath Lake during the last 45 000 years. Mixing of surficial sediments and possible mobility of the radio-isotopes limit the usefulness of the 137Cs and 210Pb data, but 210Pb profiles provide reasonable average sediment accumulation rates for the last 100-150...
Authors
Steven M. Colman, J.P. Bradbury, J. P. McGeehin, C. W. Holmes, D. Edginton, A.M. Sarna-Wojcicki
Interpretation of concentration‐discharge patterns in acid‐neutralizing capacity during storm flow in three small, forested catchments in Shenandoah National Park, Virginia Interpretation of concentration‐discharge patterns in acid‐neutralizing capacity during storm flow in three small, forested catchments in Shenandoah National Park, Virginia
Episodic concentration‐discharge (c‐Q) plots are a popular tool for interpreting the hydrochemical response of small, forested catchments. Application of the method involves assuming an underlying conceptual model of runoff processes and comparing observed c‐Q looping patterns with those predicted by the model. We analyzed and interpreted c‐Q plots of acid‐neutralizing capacity (ANC) for...
Authors
Karen C. Rice, Jeffrey G. Chanat, George M. Hornberger, James R. Webb
Altitude and configuration of the potentiometric surface in West Fallowfield, Upper Oxford, and Lower Oxford Townships, Chester County, Pennsylvania, March through July 2002 Altitude and configuration of the potentiometric surface in West Fallowfield, Upper Oxford, and Lower Oxford Townships, Chester County, Pennsylvania, March through July 2002
No abstract available.
Authors
Abdul Mohammad
Role of manganese oxides in the exposure of mute swans (Cygnus olor) to Pb and other elements in the Chesapeake Bay, USA Role of manganese oxides in the exposure of mute swans (Cygnus olor) to Pb and other elements in the Chesapeake Bay, USA
The aims of this study are to estimate exposure of waterfowl to elements in contaminated sediments in the Chesapeake Bay and to consider the potential role of Mn in influencing bioavailability and exposure. Metal concentrations were measured in livers and digesta taken from mute swans living on the Aberdeen Proving Ground, whose sediment had elevated concentrations of Cu, S, Se, Zn, As...
Authors
W. N. Beyer, D. Day
Sampling strategies for estimating acute and chronic exposures of pesticides in streams Sampling strategies for estimating acute and chronic exposures of pesticides in streams
The Food Quality Protection Act of 1996 requires that human exposure to pesticides through drinking water be considered when establishing pesticide tolerances in food. Several systematic and seasonally weighted systematic sampling strategies for estimating pesticide concentrations in surface water were evaluated through Monte Carlo simulation, using intensive datasets from four sites in
Authors
Charles G. Crawford
Cryptotis meridensis Cryptotis meridensis
No abstract available.
Authors
N. Woodman, A. D’az de Pascual
Levels of fecal corticosterone in sandhill cranes during a human-led migration Levels of fecal corticosterone in sandhill cranes during a human-led migration
Fourteen captive-reared greater sandhill cranes (Grus canadensis tabida) were conditioned to follow ultralight aircraft to promote migration between Wisconsin and Florida (USA) after release. Fecal samples were collected throughout the training period in Wisconsin and during a 1,977-km human-led migration to Florida to determine fecal corticosterone (FC) concentrations by...
Authors
B.K. Hartup, Glenn H. Olsen, Nancy M. Czekala, J. Paul-Murphy, J.A. Langenberg
A guide to sampling freshwater mussel populations A guide to sampling freshwater mussel populations
No abstract available.
Authors
David L. Strayer, David R. Smith
Natural remediation potential of arsenic-contaminated ground water Natural remediation potential of arsenic-contaminated ground water
Migration of leachate from a municipal landfill in Saco, Maine has resulted in arsenic concentrations in ground water as high as 647 μg/L. Laboratory experimental data indicate the primary source of arsenic to be reductive dissolution of arsenic-enriched iron oxyhydroxides in the aquifer by organic carbon in landfill leachate. A core from an uncontaminated part of the aquifer yielded no...
Authors
Kenneth G. Stollenwerk, John A. Colman
Comparing groups using structural equations Comparing groups using structural equations
No abstract available.
Authors
James B. Grace