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669 results on '"Faulkner, Stephen"'

1. Two Color Imaging of Different Hypoxia Levels in Cancer Cells

Author

Wallabregue, Antoine LD, Bolland, Hannah, Faulkner, Stephen, Hammond, Ester M, and Conway, Stuart J

Subjects
Medicinal and Biomolecular Chemistry, Chemical Sciences, Cancer, Generic health relevance, Humans, Hypoxia, Neoplasms, Oxygen, Fluorescent Dyes, Cell Hypoxia, General Chemistry, Chemical sciences, Engineering
Abstract

Hypoxia (low oxygen levels) occurs in a range of biological contexts, including plants, bacterial biofilms, and solid tumors; it elicits responses from these biological systems that impact their survival. For example, conditions of low oxygen make treating tumors more difficult and have a negative impact on patient prognosis. Therefore, chemical probes that enable the study of biological hypoxia are valuable tools to increase the understanding of disease-related conditions that involve low oxygen levels, ultimately leading to improved diagnosis and treatment. While small-molecule hypoxia-sensing probes exist, the majority of these image only very severe hypoxia (

Published
2023

5. Future Directions in Biomedical Imaging Using Supramolecular Chemistry

Author

Gunnlaugsson, Thorfinnur, primary, McClenaghan, Nathan D., additional, Pal, Robert, additional, Doyle, Robert P., additional, Zubieta, Jon, additional, Faulkner, Stephen, additional, Bonnet, Célia S., additional, Farrer, Nicola J., additional, Giordani, Silvia, additional, Martynenko, Irina V., additional, Purcell-Milton, Finn, additional, and Gun'ko, Yurii K., additional

Published
2022
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6. Photoswitchable luminescent lanthanide complexes controlled and interrogated by four orthogonal wavelengths of light.

Author

Simms, Charlie H., Nielsen, Villads R. M., Sørensen, Thomas Just, Faulkner, Stephen, and Langton, Matthew J.

Abstract

Optical information storage requires careful control of excitation and emission wavelengths in a reversible and orthogonal manner to enable efficient reading, writing, and erasing of information. Photochromic systems, in which a photoswitch is typcially coupled to an emissive organic fluorophore, have much promise in this regard. However, these suffer from considerable spectral overlap between the switch and fluorophore, such that their emissive and photoswitchable properties are not orthogonal. Here, we overcome this limitation by coupling visible/NIR emissive lanthanide complexes with molecular photoswitches, enabling reversible and orthogonal photoswitching with visible light. Crucially, photoswitching does not lead to sensitised emission from the lanthanide, while excitation of the lanthanide does not induce photoswitching, enabling the state of the system to be probed without perturbation of the switch. This opens up the possibility of developing multi-colour read–write methods for information storage using emissive photoswitches. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Isolation of the elusive [Ru(bipy)3]+: a key intermediate in photoredox catalysis.

Author

Horsewill, Samuel J., Cao, Chengyang, Dabney, Noah, Yang, Eric S., Faulkner, Stephen, and Scott, Daniel J.

Subjects
CATALYSIS
Abstract

Photoredox catalysis has flourished in recent years, but due to its widespread utility applications have grown faster than mechanistic understanding. In this report we help to address this deficit by isolating and characterising one of the intermediates of the iconic photocatalyst [Ru(bipy)3]2+, and testing its initial photoreactivity towards common substrates. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Chelating chloride using binuclear lanthanide complexes in water

Author

Alexander, Carlson, Thom, James A., Kenwright, Alan M., Christensen, Kirsten E., Sørensen, Thomas Just, Faulkner, Stephen, Alexander, Carlson, Thom, James A., Kenwright, Alan M., Christensen, Kirsten E., Sørensen, Thomas Just, and Faulkner, Stephen

Abstract

Halide recognition by supramolecular receptors and coordination complexes in water is a long-standing challenge. In this work, we report chloride binding in water and in competing media by pre-organised binuclear kinetically inert lanthanide complexes, bridged by flexible -(CH2)2- and -(CH2)3- spacers, forming [Ln2(DO3A)2C-2] and [Ln2(DO3A)2C-3], respectively. These hydrophilic, neutral lanthanide coordination complexes are shown to bind chloride with apparent association constants of up to 105 M−1 in water and in buffered systems. Hydroxide bridging was observed in these complexes at basic pH, which was proven to be overcome by chloride. Thus, these lanthanide complexes show promise towards chloride recognition in biology and beyond. The results described here have clearly identified a new area of anion coordination chemistry that is ripe for detailed exploration.

Published
2023

23. Conservation and Use of Coastal Wetland Forests in Louisiana

Author

Faulkner, Stephen P., Chambers, Jim L., Conner, William H., Keim, Richard F., Day, John W., Gardiner, Emile S., Hughes, Melinda S., King, Sammy L., McLeod, Kenneth W., Miller, Craig A., Nyman, J. Andrew, Shaffer, Gary P., Conner, William H., Doyle, Thomas W., and Krauss, Ken W.

Published
2007
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36. Lanthanide Complexes Used for Optical Imaging

Author

Sigel, Astrid, Freisinger, Eva, Sigel, Roland K.O., Just Sørensen, Thomas, Faulkner, Stephen, Sigel, Astrid, Freisinger, Eva, Sigel, Roland K.O., Just Sørensen, Thomas, and Faulkner, Stephen

Published
2021

42. Cell-permeable lanthanide–platinum(iv) anti-cancer prodrugs

Author

Yao, Kezi, primary, Karunanithy, Gogulan, additional, Howarth, Alison, additional, Holdship, Philip, additional, Thompson, Amber L., additional, Christensen, Kirsten E., additional, Baldwin, Andrew J., additional, Faulkner, Stephen, additional, and Farrer, Nicola J., additional

Published
2021
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44. The General Ensemble Biogeochemical Modeling System (GEMS) and its Applications to Agricultural Systems in the United States

Author

Liu, Shuguang, primary, Tan, Zhengxi, additional, Chen, Mingshi, additional, Liu, Jinxun, additional, Wein, Anne, additional, Li, Zhengpeng, additional, Huang, Shengli, additional, Oeding, Jennifer, additional, Young, Claudia, additional, Verma, Shashi B., additional, Suyker, Andrew E., additional, Faulkner, Stephen, additional, and McCarty, Gregory W., additional

Published
2012
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45. Contributors

Author

Adler, Paul R., primary, Alfieri, Joseph G., additional, Alig, Ralph, additional, Allen, Leon Hartwell, additional, Alvaro-Fuentes, Jorge, additional, Archer, David W., additional, Baker, John M., additional, Beeson, Peter C., additional, Bronson, Kevin F., additional, Brown, Tabitha T., additional, Calderon, Francisco, additional, Cambardella, Cynthia A., additional, Cavigelli, Michel A., additional, Chambers, Adam, additional, Chan, Al S.K., additional, Chen, Mingshi, additional, Collins, Harold P., additional, Daughtry, Craig S.T., additional, Davis, Sarah C., additional, Del Grosso, Stephen J., additional, Dell, Curtis J., additional, Derner, Justin D., additional, Dijkstra, Feike A., additional, Dong, Xuejun, additional, Easter, Mark, additional, Enerson, Dale, additional, Faulkner, Stephen, additional, Follett, Ronald F., additional, Franzluebbers, Alan J., additional, Goddard, Tom W., additional, Gollany, Hero T., additional, Gurung, Ram, additional, Halvorson, Ardell D., additional, Haney, Richard L., additional, Hatfield, Jerry L., additional, Hively, W. Dean, additional, Huang, Shengli, additional, Huggins, David, additional, Hunt, E. Raymond, additional, Inman, Daniel, additional, Izaurralde, R. César, additional, Jawson, Michael D., additional, Jenkins, Robin E., additional, Jin, Virginia L., additional, Johansson, Robert, additional, Johnson, Greg, additional, Johnson, Jane M.F., additional, Keough, Cindy, additional, Killian, Kendrick, additional, Kurkalova, Lyubov A., additional, Lang, Megan W., additional, Latta, Greg, additional, Lewandrowski, Jan, additional, Li, Zhengpeng, additional, Liang, Yi, additional, Liebig, Mark A., additional, Liu, Jinxun, additional, Liu, Shuguang, additional, McCarty, Gregory W., additional, McGill, William B., additional, McLain, Jean E.T., additional, Marx, Ernest, additional, Merwin, Miles, additional, Mikha, Maysoon M., additional, Milak, Sushil, additional, Morgan, Jack A., additional, Novak, Jeffrey M., additional, Oeding, Jennifer, additional, Ogle, Stephen, additional, Olson, Carolyn, additional, Owens, Lloyd B., additional, Parkin, Timothy B., additional, Parton, William J., additional, Paustian, Keith, additional, Prueger, John H., additional, Reeves, James B., additional, Reicosky, Don C., additional, Sadeghi, Ali M., additional, Sainju, Upendra M., additional, Sauer, Thomas J., additional, Schuler, Jill, additional, Serbin, Guy, additional, Shafer, Steven R., additional, Sigua, Gilbert C., additional, Skinner, R. Howard, additional, Smith, Jeffrey L., additional, Spatari, Sabrina, additional, Steenwerth, Kerri L., additional, Suddick, Emma C., additional, Suyker, Andrew E., additional, Swan, Amy, additional, Tan, Zhengxi, additional, Varvel, Gary E., additional, Venterea, Rodney T., additional, Verma, Shashi B., additional, Vining, Roel, additional, Wagner-Riddle, Claudia, additional, Walthall, Charles L., additional, Wein, Anne, additional, White, Eric, additional, Williams, Jimmy R., additional, Williams, Steve, additional, Young, Claudia, additional, and Zhang, Yimin, additional

Published
2012
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49. Denitrification potentials in restored and natural bottomland hardwood wetlands. (Division S-10--Wetland Soils)

Author

Hunter, Rachael G. and Faulkner, Stephen P.

Subjects
Denitrification -- Evaluation, Wetlands -- Environmental aspects, Hardwoods -- Evaluation, Soils -- Evaluation, Earth sciences
Abstract

Wetland restoration projects are frequently evaluated by their hydrologic roles and vegetation characteristics, but their success in restoring biogeochemical processes, such as denitrification, is less well known. To determine how restoration of structure affects specific ecosystem processes, denitrificafion potential, soluble organic C (SOC) concentrations, and soil moisture were measured seasonally over a 1-yr period in replicated natural bottomland hardwood (BLH) wetlands (NAT), restored BLH wetlands with hydrology reestablished (RWH), and restored BLH wetlands without hydrology reestablished (RWOH). Denitrification potential was significantly higher in NAT wetlands (657 ng [N.sub.2]O-N [g.sup.-1] soil [h.sup.-1]) than in RWOH (167 ng [N.sub.2]O-N [g.sup.-1] soil [h.sup.-1]) (P = 0.01). Soil moisture was highest in NAT wetlands and lowest in RWOH (P = 0.01), but no differences were measured in SOC concentrations in three out of the four seasons sampled. Because RWOH wetlands exhibited denitrification potentials which were significantly lower than NAT wetland sites, these results demonstrate that a BLH wetland restored without the natural hydrologic regime reestablished will not be a replacement for a natural BLH wetland in terms of biogeochemical processes such as denitrification.

Published
2001

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