Search Results - "Herman, Janet S."

Nitrate reduction in streambed sediments: Effects of flow and biogeochemical kinetics by Gu, C, Hornberger, G.M, Mills, A.L, Herman, J.S, Flewelling, S.A

“…The effect of retention time on redox sequences along the hydrological flow path of groundwater discharging through low‐relief coastal stream sediments and the…”
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Effect of freshets on the flux of groundwater nitrate through streambed sediments by Gu, C, Hornberger, G.M, Herman, J.S, Mills, A.L

“…The passage of a flood wave over sandy stream sediments can cause changes in the discharge of groundwater to the stream that range from a transient reduction…”
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Acidification of Earth: An assessment across mechanisms and scales by Rice, Karen C., Herman, Janet S.

“…► Anthropogenic activities cause acidification of Earth’s air, waters, and soils. ► Coal combustion causes acid rain and elevated atmospheric carbon dioxide. ►…”
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The role of moving air-water interfaces in colloid mobilization within the vadose zone by Saiers, James E., Hornberger, George M., Gower, Drew B., Herman, Janet S.

“…The movement of colloid‐sized particles through the vadose zone has important water‐quality implications, yet the mechanisms that govern colloid mobilization…”
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Effect of surface coatings, grain size, and ionic strength on the maximum attainable coverage of bacteria on sand surfaces by Bolster, Carl H, Mills, Aaron L, Hornberger, George M, Herman, Janet S

“…The injection of bacteria in the subsurface has been identified as a potential method for in situ cleanup of contaminated aquifers. For high bacterial…”
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Processes controlling the episodic streamwater transport of atrazine and other agrichemicals in an agricultural watershed by Hyer, Kenneth E, Hornberger, George M, Herman, Janet S

“…Episodic streamwater transport of atrazine (a common agricultural herbicide) and nutrients has been observed throughout agricultural watersheds in the United…”
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Effect of solution ionic strength and iron coatings on mineral grains on the sorption of bacterial cells to quartz sand by Mills, A.L, Herman, J.S, Hornberger, G.M, DeJesus, T.H

“…Understanding the interaction between bacterial cells and solid surfaces is essential to our attempts to quantify and predict the transport of microbes in…”
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Diel patterns in coastal-stream nitrate concentrations linked to evapotranspiration in the riparian zone of a low-relief, agricultural catchment by Flewelling, Samuel A., Hornberger, George M., Herman, Janet S., Mills, Aaron L., Robertson, Wendy M.

“…Evapotranspiration (ET) can cause diel fluctuations in the elevation of the water table and the stage in adjacent streams. The diel fluctuations of water…”
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Influence of stream-groundwater interactions in the streambed sediments on NO3− flux to a low-relief coastal stream by Gu, Chuanhui, Hornberger, George M., Herman, Janet S., Mills, Aaron L.

“…Water‐saturated, organic‐rich sediments immediately surrounding a stream channel can provide a protective buffer between streams and adjacent land‐based…”
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An approach for collection of nearfield groundwater samples in submerged limestone caverns by Mills, Aaron L., Tysall, Terrence N., Herman, Janet S.

“…Walls of submerged caves feeding Florida springs are often lined with a heavy mat of filamentous bacteria, many of which are able to oxidize reduced sulfur in…”
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Mobilization and Transport of Soil Particles during Infiltration Experiments in an Agricultural Field, Shenandoah Valley, Virginia by El-Farhan, Yassar H, DeNovio, Nicole M, Herman, Janet S, Hornberger, George M

“…Evidence that fine particles mobilized and transported in soils and aquifers can have a profound influence on contaminant migration has spawned much interest…”
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Fate of Microbial Metabolites of Hydrocarbons in a Coastal Plain Aquifer: The Role of Electron Acceptors by Cozzarelli, Isabelle M, Herman, Janet S, Baedecker, Mary Jo

“…The fate of microbial metabolites of hydrocarbon degradation in a shallow aquifer is examined in the presence of different electron acceptors. The results show…”
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Biological Control on Acid Generation at the Conduit-Bedrock Boundary in Submerged Caves: Quantification through Geochemical Modeling by Herman, Janet S., Hounshell, Alexandria G., Franklin, Rima B., Mills, Aaron L.

“…No-mount Cave, located in Wekiwa Springs State Park in central Florida, USA, is an aphotic, submerged, freshwater cave in which large colonies of…”
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Iron reduction in the sediments of a hydrocarbon-contaminated aquifer by Tuccillo, Mary Ellen, Cozzarelli, Isabelle M, Herman, Janet S

“…Sediments sampled at a hydrocarbon-contaminated, glacial-outwash, sandy aquifer near Bemidji, Minnesota, were analyzed for sediment-associated Fe with several…”
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Atrazine Adsorption and Colloid‐Facilitated Transport through the Unsaturated Zone by Sprague, Lori A., Herman, Janet S., Hornberger, George M., Mills, Aaron L.

“…One explanation for unexpectedly widespread ground water contamination from atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐s‐triazine) may be the occurrence…”
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Effect of Bacterial Cell Shape on Transport of Bacteria in Porous Media by Weiss, Thomas H, Mills, Aaron L, Hornberger, George M, Herman, Janet S

“…The influence of bacterial cell shape on microbial transport through porous media was examined in quartz sand-filled columns. Properties of the 14 bacterial…”
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Geochemical heterogeneity of a gasoline-contaminated aquifer by Cozzarelli, Isabelle M, Herman, Janet S, Baedecker, Mary Jo, Fischer, Jeffrey M

“…The scale of biogeochemical reactions was studied in a physically and chemically heterogeneous surficial Coastal Plain aquifer contaminated by a gasoline…”
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Changes in the sorption capacity of Coastal Plain sediments due to redox alteration of mineral surfaces by Knapp, Elizabeth P, Herman, Janet S, Mills, Aaron L, Hornberger, George M

“…Chemical characteristics of grain coatings in a Coastal Plain sandy aquifer on the Eastern Shore of Virginia were investigated where sediments have been…”
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Travel time controls the magnitude of nitrate discharge in groundwater bypassing the riparian zone to a stream on Virginia's coastal plain by Flewelling, Samuel A., Herman, Janet S., Hornberger, George M., Mills, Aaron L.

“…Groundwater that bypasses the riparian zone by travelling along deep flow paths may deliver high concentrations of fertilizer‐derived NO3− to streams, or it…”
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Karst Lands by White, William B., Culver, David C., Herman, Janet S., Kane, Thomas C., Mylroie, John E.

“…Karst lands were created thousands of years ago when the action of water dissolved carbonate rocks to form unique landscapes. This dissolution process led to…”
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