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Full-Text Articles in Physical Sciences and Mathematics
Thermally Selective Formation Of Subsurface Oxygen In Ag(111) And Consequent Surface Structure, Jonathan Derouin, Rachael G. Farber, Marie E. Turano, Erin V. Iski, Daniel Killelea
Thermally Selective Formation Of Subsurface Oxygen In Ag(111) And Consequent Surface Structure, Jonathan Derouin, Rachael G. Farber, Marie E. Turano, Erin V. Iski, Daniel Killelea
Chemistry: Faculty Publications and Other Works
A long-standing challenge in the study of heterogeneously catalyzed reactions on silver surfaces has been the determination of what oxygen species are of greatest chemical importance. This is due to the coexistence of several different surface phases on oxidized silver surfaces. A further complication is subsurface oxygen (Osub). Osub are O atoms absorbed into the near surface of a metal, and are expected to alter the surface in terms of chemistry and structure, but these effects have yet to be well characterized. We studied oxidized Ag(111) surfaces after exposure to gas-phase O atoms to determine how Osub is formed and …
Double-Stranded Water On Stepped Platinum Surfaces, Manuel J. Kolb, Rachael G. Farber, Jonathan Derouin, Cansin Badan, Federico Calle-Vallejo, Ludo B. F. Juurlink, Daniel Killelea, Marc T. M. Koper
Double-Stranded Water On Stepped Platinum Surfaces, Manuel J. Kolb, Rachael G. Farber, Jonathan Derouin, Cansin Badan, Federico Calle-Vallejo, Ludo B. F. Juurlink, Daniel Killelea, Marc T. M. Koper
Chemistry: Faculty Publications and Other Works
The interaction of platinum with water plays a key role in (electro)catalysis. Herein, we describe a combined theoretical and experimental study that resolves the preferred adsorption structure of water wetting the Pt(111)-step type with adjacent (111) terraces. Double stranded lines wet the step edge forming water tetragons with dissimilar hydrogen bonds within and between the lines. Our results qualitatively explain experimental observations of water desorption and impact our thinking of solvation at the Pt electrochemical interface.
Binding Of Transcription Factor Gabr To Dna Requires Recognition Of Dna Shape At A Location Distinct From Its Cognate Binding Site, Dali Liu, Walid A. Al-Zyoud, Robert Mg. Hynson, Lorraine A. Ganuelas, Adelle Cf. Coster, Anthony P. Duff, Matthew Ab. Baker, Alastair G. Stewart, Eleni Giannoulatou, Joshua Wk> Ho, Katharina Gaus, Lawrence K. Lee, Till Böcking
Binding Of Transcription Factor Gabr To Dna Requires Recognition Of Dna Shape At A Location Distinct From Its Cognate Binding Site, Dali Liu, Walid A. Al-Zyoud, Robert Mg. Hynson, Lorraine A. Ganuelas, Adelle Cf. Coster, Anthony P. Duff, Matthew Ab. Baker, Alastair G. Stewart, Eleni Giannoulatou, Joshua Wk> Ho, Katharina Gaus, Lawrence K. Lee, Till Böcking
Chemistry: Faculty Publications and Other Works
Mechanisms for transcription factor recognition of specific DNA base sequences are well characterized and recent studies demonstrate that the shape of these cognate binding sites is also important. Here, we uncover a new mechanism where the transcription factor GabR simultaneously recognizes two cognate binding sites and the shape of a 29 bp DNA sequence that bridges these sites. Small-angle X-ray scattering and multi-angle laser light scattering are consistent with a model where the DNA undergoes a conformational change to bend around GabR during binding. In silico predictions suggest that the bridging DNA sequence is likely to be bendable in one …
Investigation Of Heavy Metals In Zebrafish Tissue By Total Reflection X-Ray Fluorescence, Martina Schmeling, E. Jamka, J. Arroyo, K. Niaz, T. Trinh
Investigation Of Heavy Metals In Zebrafish Tissue By Total Reflection X-Ray Fluorescence, Martina Schmeling, E. Jamka, J. Arroyo, K. Niaz, T. Trinh
Chemistry: Faculty Publications and Other Works
Heavy metals are present in the environment, in many consumer products and can be found in food. Some heavy metals like zinc and copper are essential for enzymatic and metabolic function while others like lead and mercury are toxic and interfere with biological pathways. Zebrafish are a very popular model organism for monitoring toxicity of heavy metals and investigating vertebrate development. In this study we explore the possibility of using total reflection X-ray fluorescence spectrometry to analyze histological sections of zebrafish embryos after exposure to nickel and lead. A methacrylate resin embedding protocol and a paraffin embedding protocol were evaluated …