William H. Orem, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 130
Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Mercury speciation, controls on methylmercury (MeHg) production, and bed sediment−pore water partitioning of total Hg (THg) and MeHg were examined in bed sediment from eight geochemically diverse streams where atmospheric deposition was the predominant Hg input. Across all streams, sediment THg concentrations were best described as a combined function of sediment percent fines (%fines...
Authors
Mark Marvin-DiPasquale, Michelle Lutz, Mark Brigham, David Krabbenhoft, George Aiken, William Orem, Britt Hall
Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades? Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades?
1. The expansion of Typha domingensis into areas once dominated by Cladium jamaicense in the Florida Everglades has been attributed to altered hydrology and phosphorus enrichment, although increased concentrations of sulphate and phosphorus often coincide. The potential importance of hydrogen sulphide produced from sulphate in the expansion of Typha has received little attention. The...
Authors
S. Li, I.A. Mendelssohn, Chen Hao, W. H. Orem
Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications
A maturation series of resins and fossil resins from New Zealand, ranging in age from Modern to Eocene and ranging from uncoalified to high volatile C bituminous coal, were analyzed by elemental, pyrolysis-gas chromatography (Py-GC), Fourier Transform infrared (FTir), and solid-state 13C nuclear magnetic resonance (13C NMR) techniques. For comparison, four resin samples from the Latrobe...
Authors
P.C. Lyons, Maria Mastalerz, W. H. Orem
A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf
Three sediment cores were collected off the Mississippi River delta on the Louisiana Shelf at sites that are variably influenced by recurring, summer-time water-column hypoxia and fluvial loadings. The cores, with established chronology, were analyzed for their respective carbon, nitrogen, and sulfur elemental and isotopic composition to examine variable organic matter inputs, and to...
Authors
R.J. Rosenbauer, P.W. Swarzenski, C. Kendall, W. H. Orem, F. D. Hostettler, M.E. Rollog
Divisions of geologic time - Major chronostratigraphic and geochronologic units Divisions of geologic time - Major chronostratigraphic and geochronologic units
[No abstract available]
Authors
R. Orndorff, N. Stamm, S. Craigg, T. D’Erchia, L. Edwards, D. Fullerton, B. Murchey, L. Ruppert, D. Soller, B. Tew
Pick your poison: If one pollutant doesn't take down the everglades, another might Pick your poison: If one pollutant doesn't take down the everglades, another might
[No abstract available]
Authors
W. H. Orem
Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04 Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04
Mercury contamination of aquatic ecosystems is an issue of national concern, affecting both wildlife and human health. Detailed information on mercury cycling and food-web bioaccumulation in stream settings and the factors that control these processes is currently limited. In response, the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) conducted detailed...
Authors
Mark Marvin-DiPasquale, Michelle A. Lutz, David Krabbenhoft, George Aiken, William Orem, Britt Hall, John DeWild, Mark Brigham
Chemical Results of Laboratory Dry/Rewet Experiments Conducted on Wetland Soils from Two Sites in the Everglades, Florida Chemical Results of Laboratory Dry/Rewet Experiments Conducted on Wetland Soils from Two Sites in the Everglades, Florida
Drought and fire are natural environmental factors that have historically impacted and shaped the Everglades ecosystem. For example, drought and fire help to maintain the existing ecosystem biotic assemblage by periodically eradicating invading flora not adapted to living with this normal aspect of Everglades' ecology. Flora native to the Everglades are adapted to withstand normal...
Authors
William Orem
Mercury, trace elements and organic constituents in atmospheric fine particulate matter, Shenandoah National Park, Virginia, USA: A combined approach to sampling and analysis Mercury, trace elements and organic constituents in atmospheric fine particulate matter, Shenandoah National Park, Virginia, USA: A combined approach to sampling and analysis
Compliance with U.S. air quality regulatory standards for atmospheric fine particulate matter (PM2.5) is based on meeting average 24 hour (35 μ m−3) and yearly (15 μg m−3) mass‐per‐unit‐volume limits, regardless of PM2.5 composition. Whereas this presents a workable regulatory framework, information on particle composition is needed to assess the fate and transport of PM2.5 and determine...
Authors
A. Kolker, M.A. Engle, W. H. Orem, J.E. Bunnell, H.E. Lerch, D. P. Krabbenhoft, M.L. Olson, J.D. McCord
Bioassay for estimating the biogenic methane-generating potential of coal samples Bioassay for estimating the biogenic methane-generating potential of coal samples
Generation of secondary biogenic methane in coal beds is likely controlled by a combination of factors such as the bioavailability of coal carbon, the presence of a microbial community to convert coal carbon to methane, and an environment supporting microbial growth and methanogenesis. A set of treatments and controls was developed to bioassay the bioavailability of coal for conversion...
Authors
Elizabeth Jones, Mary Voytek, Peter Warwick, M.D. Corum, Alexander Cohn, Joseph Bunnell, Arthur Clark, William Orem
NMR and mass spectrometry of phosphorus in wetlands NMR and mass spectrometry of phosphorus in wetlands
There is at present little information on the long-term stability of phosphorus sequestered in wetlands. Phosphorus sequestered during high loading periods may be relatively unstable and easily remobilized following changes in nutrient status or hydrological regime, but the chemical forms of sequestered phosphorus that do remobilize are largely unknown at this time. A lack of suitable...
Authors
H. El-Rifai, M. Heerboth, T.E. Gedris, S. Newman, W. Orem, W.T. Cooper
The role of lecithin cholesterol acyltransferase and organic substances from coal in the etiology of Balkan endemic nephropathy: A new hypothesis The role of lecithin cholesterol acyltransferase and organic substances from coal in the etiology of Balkan endemic nephropathy: A new hypothesis
Balkan endemic nephropathy (BEN) occurs in Serbia, Bulgaria, Romania, Bosnia and Herzegovina, and Croatia. BEN has been characterized as a chronic, slowly progressive renal disease of unknown etiology. In this study, we examined the influence of soluble organic compounds in drinking water leached from Pliocene lignite from BEN-endemic areas on plasma lecithin-cholesterol acyltransferase...
Authors
N.M. Pavlovic, W. H. Orem, C. A. Tatu, H.E. Lerch, J.E. Bunnell, G. Feder, E.N. Kostic, V.L. Ordodi
Science and Products
Filter Total Items: 130
Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Mercury speciation, controls on methylmercury (MeHg) production, and bed sediment−pore water partitioning of total Hg (THg) and MeHg were examined in bed sediment from eight geochemically diverse streams where atmospheric deposition was the predominant Hg input. Across all streams, sediment THg concentrations were best described as a combined function of sediment percent fines (%fines...
Authors
Mark Marvin-DiPasquale, Michelle Lutz, Mark Brigham, David Krabbenhoft, George Aiken, William Orem, Britt Hall
Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades? Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades?
1. The expansion of Typha domingensis into areas once dominated by Cladium jamaicense in the Florida Everglades has been attributed to altered hydrology and phosphorus enrichment, although increased concentrations of sulphate and phosphorus often coincide. The potential importance of hydrogen sulphide produced from sulphate in the expansion of Typha has received little attention. The...
Authors
S. Li, I.A. Mendelssohn, Chen Hao, W. H. Orem
Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications
A maturation series of resins and fossil resins from New Zealand, ranging in age from Modern to Eocene and ranging from uncoalified to high volatile C bituminous coal, were analyzed by elemental, pyrolysis-gas chromatography (Py-GC), Fourier Transform infrared (FTir), and solid-state 13C nuclear magnetic resonance (13C NMR) techniques. For comparison, four resin samples from the Latrobe...
Authors
P.C. Lyons, Maria Mastalerz, W. H. Orem
A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf
Three sediment cores were collected off the Mississippi River delta on the Louisiana Shelf at sites that are variably influenced by recurring, summer-time water-column hypoxia and fluvial loadings. The cores, with established chronology, were analyzed for their respective carbon, nitrogen, and sulfur elemental and isotopic composition to examine variable organic matter inputs, and to...
Authors
R.J. Rosenbauer, P.W. Swarzenski, C. Kendall, W. H. Orem, F. D. Hostettler, M.E. Rollog
Divisions of geologic time - Major chronostratigraphic and geochronologic units Divisions of geologic time - Major chronostratigraphic and geochronologic units
[No abstract available]
Authors
R. Orndorff, N. Stamm, S. Craigg, T. D’Erchia, L. Edwards, D. Fullerton, B. Murchey, L. Ruppert, D. Soller, B. Tew
Pick your poison: If one pollutant doesn't take down the everglades, another might Pick your poison: If one pollutant doesn't take down the everglades, another might
[No abstract available]
Authors
W. H. Orem
Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04 Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04
Mercury contamination of aquatic ecosystems is an issue of national concern, affecting both wildlife and human health. Detailed information on mercury cycling and food-web bioaccumulation in stream settings and the factors that control these processes is currently limited. In response, the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) conducted detailed...
Authors
Mark Marvin-DiPasquale, Michelle A. Lutz, David Krabbenhoft, George Aiken, William Orem, Britt Hall, John DeWild, Mark Brigham
Chemical Results of Laboratory Dry/Rewet Experiments Conducted on Wetland Soils from Two Sites in the Everglades, Florida Chemical Results of Laboratory Dry/Rewet Experiments Conducted on Wetland Soils from Two Sites in the Everglades, Florida
Drought and fire are natural environmental factors that have historically impacted and shaped the Everglades ecosystem. For example, drought and fire help to maintain the existing ecosystem biotic assemblage by periodically eradicating invading flora not adapted to living with this normal aspect of Everglades' ecology. Flora native to the Everglades are adapted to withstand normal...
Authors
William Orem
Mercury, trace elements and organic constituents in atmospheric fine particulate matter, Shenandoah National Park, Virginia, USA: A combined approach to sampling and analysis Mercury, trace elements and organic constituents in atmospheric fine particulate matter, Shenandoah National Park, Virginia, USA: A combined approach to sampling and analysis
Compliance with U.S. air quality regulatory standards for atmospheric fine particulate matter (PM2.5) is based on meeting average 24 hour (35 μ m−3) and yearly (15 μg m−3) mass‐per‐unit‐volume limits, regardless of PM2.5 composition. Whereas this presents a workable regulatory framework, information on particle composition is needed to assess the fate and transport of PM2.5 and determine...
Authors
A. Kolker, M.A. Engle, W. H. Orem, J.E. Bunnell, H.E. Lerch, D. P. Krabbenhoft, M.L. Olson, J.D. McCord
Bioassay for estimating the biogenic methane-generating potential of coal samples Bioassay for estimating the biogenic methane-generating potential of coal samples
Generation of secondary biogenic methane in coal beds is likely controlled by a combination of factors such as the bioavailability of coal carbon, the presence of a microbial community to convert coal carbon to methane, and an environment supporting microbial growth and methanogenesis. A set of treatments and controls was developed to bioassay the bioavailability of coal for conversion...
Authors
Elizabeth Jones, Mary Voytek, Peter Warwick, M.D. Corum, Alexander Cohn, Joseph Bunnell, Arthur Clark, William Orem
NMR and mass spectrometry of phosphorus in wetlands NMR and mass spectrometry of phosphorus in wetlands
There is at present little information on the long-term stability of phosphorus sequestered in wetlands. Phosphorus sequestered during high loading periods may be relatively unstable and easily remobilized following changes in nutrient status or hydrological regime, but the chemical forms of sequestered phosphorus that do remobilize are largely unknown at this time. A lack of suitable...
Authors
H. El-Rifai, M. Heerboth, T.E. Gedris, S. Newman, W. Orem, W.T. Cooper
The role of lecithin cholesterol acyltransferase and organic substances from coal in the etiology of Balkan endemic nephropathy: A new hypothesis The role of lecithin cholesterol acyltransferase and organic substances from coal in the etiology of Balkan endemic nephropathy: A new hypothesis
Balkan endemic nephropathy (BEN) occurs in Serbia, Bulgaria, Romania, Bosnia and Herzegovina, and Croatia. BEN has been characterized as a chronic, slowly progressive renal disease of unknown etiology. In this study, we examined the influence of soluble organic compounds in drinking water leached from Pliocene lignite from BEN-endemic areas on plasma lecithin-cholesterol acyltransferase...
Authors
N.M. Pavlovic, W. H. Orem, C. A. Tatu, H.E. Lerch, J.E. Bunnell, G. Feder, E.N. Kostic, V.L. Ordodi