Search Results - "McKnight, Diane M"

Ancient low–molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw by Drake, Travis W., Wickland, Kimberly P., Spencer, Robert G. M., McKnight, Diane M., Striegl, Robert G.

“…Northern permafrost soils store a vast reservoir of carbon, nearly twice that of the present atmosphere. Current and projected climate warming threatens…”
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Dissolved Organic Matter Quality in a Shallow Aquifer of Bangladesh: Implications for Arsenic Mobility by Mladenov, Natalie, Zheng, Yan, Simone, Bailey, Bilinski, Theresa M, McKnight, Diane M, Nemergut, Diana, Radloff, Kathleen A, Rahman, M. Moshiur, Ahmed, Kazi Matin

“…In some high arsenic (As) groundwater systems, correlations are observed between dissolved organic matter (DOM) and As concentrations, but in other systems,…”
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Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction by Kulkarni, Harshad V., Mladenov, Natalie, McKnight, Diane M., Zheng, Yan, Kirk, Matthew F., Nemergut, Diana R.

“…It was demonstrated more than two decades ago that microorganisms use humic substances, including fulvic acid (FA), as electron shuttles during iron (Fe)…”
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Characterization of IHSS Pony Lake fulvic acid dissolved organic matter by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and fluorescence spectroscopy by D’Andrilli, Juliana, Foreman, Christine M., Marshall, Alan G., McKnight, Diane M.

“…•IHSS Pony Lake and Suwannee River fulvic acid DOM reference samples compared.•Molecular constituents assigned and characterized using FT-ICR MS.•Complementary…”
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Comparison of seasonal changes in fluorescent dissolved organic matter among aquatic lake and stream sites in the Green Lakes Valley by Miller, Matthew P., McKnight, Diane M.

“…The spectral characteristics of whole water dissolved organic matter (DOM) and fulvic acid were studied in samples collected from an alpine lake, a subalpine…”
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Dissolved black carbon in Antarctic lakes: Chemical signatures of past and present sources by Khan, Alia L., Jaffé, Rudolf, Ding, Yan, McKnight, Diane M.

“…The perennially ice‐covered, closed‐basin lakes in the McMurdo Dry Valleys, Antarctica, serve as sentinels for understanding the fate of dissolved black carbon…”
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Riparian Bird Occupancy in a Mountain Watershed in the Colorado Mineral Belt Appears Resilient to Climate-Change-Driven Increases in Metals and Rare Earth Elements in Water and Aquatic Macroinvertebrates by Watson, Kelly E, McKnight, Diane M

“…Acid rock drainage (ARD) impacts species composition in mountain streams. The potential impact for riparian birds experiencing elevated metal uptake by…”
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Drifting along: using diatoms to track the contribution of microbial mats to particulate organic matter transport in a glacial meltwater stream in the McMurdo Dry Valleys, Antarctica by Stanish, Lee F, Kohler, Tyler J, Darling, Joshua, McKnight, Diane M

“…Flow pulses mobilize particulate organic matter (POM) in streams from the surrounding landscape and streambed. This POM serves as a source of energy and…”
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Dissolved Organic Matter Sources and Consequences for Iron and Arsenic Mobilization in Bangladesh Aquifers by Mladenov, Natalie, Zheng, Yan, Miller, Matthew P, Nemergut, Diana R, Legg, Teresa, Simone, Bailey, Hageman, Clarissa, Rahman, M. Moshiur, Ahmed, K. Matin, McKnight, Diane M

“…Iron (Fe) and dissolved organic matter (DOM) cycling have been implicated in arsenic mobilization via microbially mediated Fe oxide reduction. To evaluate the…”
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Microbial life at −13 °C in the brine of an ice-sealed Antarctic lake by Murray, Alison E, Kenig, Fabien, Fritsen, Christian H, McKay, Christopher P, Cawley, Kaelin M, Edwards, Ross, Kuhn, Emanuele, McKnight, Diane M, Ostrom, Nathaniel E, Peng, Vivian, Ponce, Adrian, Priscu, John C, Samarkin, Vladimir, Townsend, Ashley T, Wagh, Protima, Young, Seth A, Yung, Pung To, Doran, Peter T

“…The permanent ice cover of Lake Vida (Antarctica) encapsulates an extreme cryogenic brine ecosystem (−13 °C; salinity, 200). This aphotic ecosystem is anoxic…”
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Supporting Simultaneous Air Revitalization and Thermal Control in a Crewed Habitat With Temperate Chlorella vulgaris and Eurythermic Antarctic Chlorophyta by Matula, Emily E., Nabity, James A., McKnight, Diane M.

“…Including a multifunctional, bioregenerative algal photobioreactor for simultaneous air revitalization and thermal control may aid in carbon loop closure for…”
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Chemical characteristics of fulvic acids from Arctic surface waters: Microbial contributions and photochemical transformations by Cory, Rose M., McKnight, Diane M., Chin, Yu-Ping, Miller, Penney, Jaros, Chris L.

“…Dissolved organic matter (DOM) originating from the extensive Arctic tundra is an important source of organic material to the Arctic Ocean. Chemical…”
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Patterns of bacterial biodiversity in the glacial meltwater streams of the McMurdo Dry Valleys, Antarctica by Van Horn, David J., Wolf, Caitlin R., Colman, Daniel R., Jiang, Xiaoben, Kohler, Tyler J., McKnight, Diane M., Stanish, Lee F., Yazzie, Terrill, Takacs-Vesbach, Cristina D.

“…Microbial consortia dominate glacial meltwater streams from polar regions, including the McMurdo Dry Valleys (MDV), where they thrive under physiologically…”
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Impacts of coal dust from an active mine on the spectral reflectance of Arctic surface snow in Svalbard, Norway by Khan, Alia L., Dierssen, Heidi, Schwarz, Joshua P., Schmitt, Carl, Chlus, Adam, Hermanson, Mark, Painter, Thomas H., McKnight, Diane M.

“…Light‐absorbing particles (LAPs) in snow such as dust and black carbon influence the radiative forcing at the Earth's surface, which has major implications for…”
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A Model of Degradation and Production of Three Pools of Dissolved Organic Matter in an Alpine Lake by Miller, Matthew P., McKnight, Diane M., Chapra, Steven C., Williams, Mark W.

“…We investigated the transport and production of dissolved organic matter (DOM) in an alpine lake in the Colorado Front Range during snowmelt and the summer…”
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Spectrofluorometric Characterization of Dissolved Organic Matter for Indication of Precursor Organic Material and Aromaticity by McKnight, Diane M., Boyer, Elizabeth W., Westerhoff, Paul K., Doran, Peter T., Kulbe, Thomas, Andersen, Dale T.

“…We studied the fluorescence properties of fulvic acids isolated from streams and rivers receiving predominantly terrestrial sources of organic material and…”
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Probing the oxidation–reduction properties of terrestrially and microbially derived dissolved organic matter by Fimmen, Ryan L., Cory, Rose M., Chin, Yu-Ping, Trouts, Tamara D., McKnight, Diane M.

“…Dissolved organic matter (DOM) has been shown to be an integral component in biogeochemical electron transfer reactions due to its demonstrated ability to…”
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Characterization of a nitrogen-rich fulvic acid and its precursor algae from solid state NMR by Mao, Jingdong, Cory, Rose M., McKnight, Diane M., Schmidt-Rohr, Klaus

“…A nitrogen-rich fulvic acid (FA) from Pony Lake, a coastal pond in Antarctica, was investigated using advanced solid state nuclear magnetic resonance (NMR)…”
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Characterizing chlorine oxidation of dissolved organic matter and disinfection by-product formation with fluorescence spectroscopy and parallel factor analysis by Beggs, Katherine M. H., Summers, R. Scott, McKnight, Diane M.

“…Relationships between chlorine demand and disinfection by‐product (DBP) formation during chlorination and fluorescence of dissolved organic matter (DOM) were…”
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Hydrological Controls on Ecosystem Dynamics in Lake Fryxell, Antarctica by Herbei, Radu, Rytel, Alexander L, Lyons, W Berry, McKnight, Diane M, Jaros, Christopher, Gooseff, Michael N, Priscu, John C

“…The McMurdo Dry Valleys constitute the largest ice free area of Antarctica. The area is a polar desert with an annual precipitation of ∼ 3 cm water equivalent,…”
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