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GeoHEALTH-USGS Newsletter

The GeoHEALTH–USGS Newsletter—published since 2004—provides information on USGS science activities pertinent to safeguarding the health of fish, wildlife, domesticated animals, and people from environmental exposures to contaminants and pathogens.

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April 1, 1985

Effects of copper on production of periphyton, nitrogen fixation and processing of leaf litter in a Sierra Nevada, California, stream Effects of copper on production of periphyton, nitrogen fixation and processing of leaf litter in a Sierra Nevada, California, stream

1Production of periphyton, nitrogen fixation and processing of leaf litter were examined in an oligotrophic Sierra Nevada stream and the responses of these processes to copper (2.5, 5 and 10μg 1-1 CuT [total filtrable copper]; approximately 12, 25 and 50 ng 1-1 Cu2+) were determined.2Autotrophic and total production were estimated from 3-week accumulations of biomass on artificial...

Authors

Harry V. Leland, James L. Carter

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

March 1, 1985

Sorption of lead onto two gram-negative marine bacteria in seawater Sorption of lead onto two gram-negative marine bacteria in seawater

Laboratory adsorption experiments performed at environmentally significant lead (Pb) and cell concentrations indicate that the marine bacteria examined have significant binding capacities for Pb. However, the behavior governing Pb sorption onto gram-negative bacteria in seawater may be quite complex. The sorption kinetics appear to involve two distinct phases, i.e., a rapid removal of Pb...

Authors

Ronald W. Harvey, James O. Leckie

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Application of NMR spectroscopy for determining functionality in humic substances Application of NMR spectroscopy for determining functionality in humic substances

No abstract available.

Authors

Robert L. Wershaw

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Molecular weight and size measurements of humic substances Molecular weight and size measurements of humic substances

No abstract available.

Authors

R.L. Wershaw, George R. Aiken

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Colorado Water Science Center

January 1, 1985

Groundwater forecasting Groundwater forecasting

No abstract available.

Authors

Leonard F. Konikow, E.P. Patten

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Stable isotope and amino acid composition of estuarine dissolved colloidal material Stable isotope and amino acid composition of estuarine dissolved colloidal material

No abstract available.

Authors

A.C. Sigleo, S.A. Macko

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Aspects of the biogeochemistry of Big Soda Lake, Nevada Aspects of the biogeochemistry of Big Soda Lake, Nevada

No abstract available.

Authors

Ronald S. Oremland, R. L. Smith, Charles W. Culbertson

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, New England Water Science Center

January 1, 1985

Humic substances in groundwater Humic substances in groundwater

No abstract available.

Authors

E.M. Thurman

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Approaches to the study of lake hydrology Approaches to the study of lake hydrology

No abstract available

Authors

Gene E Likens

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Errors and parameter estimation in precipitation-runoff modeling: 1. Theory Errors and parameter estimation in precipitation-runoff modeling: 1. Theory

Errors in complex conceptual precipitation-runoff models may be analyzed by placing them into a statistical framework. This amounts to treating the errors as random variables and defining the probabilistic structure of the errors. By using such a framework, a large array of techniques, many of which have been presented in the statistical literature, becomes available to the modeler for...

Authors

Brent M. Troutman

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Origin of caves and other solution openings in the unsaturated (vadose) zone of carbonate rocks: A model for CO2 generation Origin of caves and other solution openings in the unsaturated (vadose) zone of carbonate rocks: A model for CO2 generation

The enigma that caves and other solution openings form in carbonate rocks at great depths below land surface rather than forming from the surface downward can be explained by the generation of CO2 within the aquifer system. In the proposed model, CO2 is generated by the oxidation of particulate and/or dissolved organic carbon that is transported from the land surface deep into the...

Authors

W.W. Wood

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1985

Phosphorus-zinc interactive effects on growth by Selenastrum capricornutum (chlorophyta) Phosphorus-zinc interactive effects on growth by Selenastrum capricornutum (chlorophyta)

No abstract available.

Authors

J.S. Kuwabara

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program