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Search Publications

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Displaying 101 - 125 of 806

Solution Structures of Bacillus Anthracis Protective Antigen Proteins using Small Angle Neutron Scattering and Protective Antigen 63 Ion Channel Formation Kinetics

December 11, 2021
Author(s)
Ariel Michelman-Ribeiro, Kenneth A. Rubinson, Vitalii Silin, John J. Kasianowicz
We are studying the structures of bacterial toxins that form ion channels and catalyze macromolecule transport across membranes. For example, the crystal structure of the Staphylococcus aureus α-hemolysin (α-HL) channel in its functional state was

Hydrogen in nonstoichiometric cubic titanium monoxides: X-ray and neutron diffraction, neutron vibrational spectroscopy and NMR studies

December 1, 2021
Author(s)
A. V. Skripov, A. V. Soloninin, A. A. Valeeva, A. I. Gusev, A. A. Rempel, Hui Wu, Terrence J. Udovic
Hydrogen-induced changes in the properties of transition-metal oxides have attracted much recent attention due to numerous applications of these materials including catalysis, H2 production, low-temperature H2 sensing, solar cells, and air purification

In-situ Monitoring of Protein Unfolding/Structural States under Cold High-Pressure Stress

November 26, 2021
Author(s)
Diana Gomes, Susana C. Marujo Teixeira, Juscelino Leao, Vladimir Razinkov, Wei Qi, Miguel Rodrigues, Christopher Roberts
Biopharmaceutical formulations may be compromised by freezing, which has been attributed to protein conformational changes at a low temperature, and adsorption to ice−liquid interfaces. However, direct measurements of unfolding/conformational changes in

Iridate Li 8 IrO 6 : An Antiferromagnetic Insulator

November 15, 2021
Author(s)
Callista M. Skaggs, Peter E. Siegfried, Chang-Jong Kang, Craig Brown, Fu Chen, Lu Ma, Steven N. Ehrlich, Yan Xin, Mark Croft, Wenqian Xu, Saul H. Lapidus, Nirmal J. Ghimire, Xiaoyan Tan
A poltcrystalline iridate, Li 8IrO 6, material was prepared via heating Li 2O and IrO 2 starting materials in a sealed quartz tube at 650 °C for 48 hours. The structure was determined from Rietveld refinement of room temperature powder neutron diffraction

Quantifying and Suppressing Proton Intercalation to Enable High-Voltage Zn-Ion Batteries

November 4, 2021
Author(s)
Fei Wang, Lauren E. Blanc, Qin Li, Antonio Faraone, Xiao Ji, Huaiyu H. Chen-Mayer, Rick L. Paul, Joseph Dura, Enyuan Hu, Kang Xu, Linda F. Nazar, Chunsheng Wang
We explore the Zn-ion intercalation mechanisms/interfacial dynamics of VPO 4F and quantify the water dynamics in water-in-salt (WISE) and hybrid aqueous-non aqueous electrolytes (HANEs). We demonstrate that H + intercalation dominates electrochemical

A Semi-Supervised Approach for Automatic Crystal Structure Classification

November 1, 2021
Author(s)
Satvik Lolla, Haotong Liang, A. Gilad Kusne, Ichiro Takeuchi, William D. Ratcliff
The structural solution problem can be a daunting and time consuming task. Especially in the presence of impurity phases, current methods such as indexing become more unstable. In this work, we apply the novel approach of semi-supervised learning towards

On the Cluster Formation of a-Synuclein Fibrils

October 19, 2021
Author(s)
Marija Dubackic, Ilaria Idini, Veronica Lattanzi, Yun Liu, Anne Martel, Ann Terry, Michael Haertlein, Juliette Devos, Andrew J. Jackson, Emma Sparr, Sara Linse, Ulf Olsson
The dense accumulation of α-Synuclein fibrils in neurons is considered to be strongly associated with Parkinson's disease. These intracellular inclusions, called Lewy bodies, also contain significant amounts of lipids. To better understand such

Spatially Resolved Potential and Li-Ion Distributions Reveal Performance-Limiting Regions in Solid-State Batteries

October 19, 2021
Author(s)
Elliot Fuller, Evgheni Strelcov, Jamie Weaver, Michael Swift, Joshua Sugar, Andrei Kolmakov, Nikolai Zhitenev, Jabez J. McClelland, Yue Qi, Joseph Dura, Alec Talin
The performance of solid-state electrochemical systems is intimately tied to the potential and lithium distributions across electrolyte–electrode junctions that give rise to interface impedance. Here, we combine two operando methods, Kelvin probe force

Dual-Modality Poly-^dL-Histidine Nanoparticles to Deliver Peptide Nucleic Acids and Paclitaxel for In Vivo Cancer Therapy

September 29, 2021
Author(s)
Aniket Wahane, Shipra Malik, Kuo-Chih Shih, Ravinder R. Gaddam, Chaohao Chen, Yun Liu, Mu-Ping Neih, Ajit Vikram, Raman Bahal
Cationic polymeric nanoformulations have been explored to increase the transfection efficiency of small molecules and nucleic acid-based drugs. However, excess of positive charge often leads to severe cell and tissue-based toxicity that restrict the

Hidden Complexity in the Chemistry of Ammonolysis-Derived "gamma-Mo2N": An Overlooked Oxynitride Hydride

September 14, 2021
Author(s)
Rick L. Paul, Shobhit A. Pandey, Chi Zhang, Daniah H. Ibrahim, Elise A. Goldfine, Jill K. Wenderott, Roberto dos Reis, Ionnis Spanopoulos, Mercouri Kanatzidis, Michael J. Bedzyk, Vinayak P. Dravid, Gabriela B. Gonzalez, Sossina M. Haile
Molybdenum nitrides have been employed in a variety of catalysis and electronic applications. For use in catalysis, the cubic  phase with nominal stoichiometry Mo2N and space group Fm3 ̅m is typically prepared by high temperature reaction of MoO3 with NH3

Pendellosung Interferometry Probes the Neutron Charge Radius, Lattice Dynamics, and Fifth Forces

September 10, 2021
Author(s)
Benjamin J. Heacock, Robert W. Haun, Michael G. Huber, Albert Henins, Robert C. Valdillez, Takuhiro Fujiie, Katsuya Hirota, Masaaki Kitaguchi, Hirohiko Shimizu, Takuya Hosobata, Masahiro Takeda, Yutaka Yamagata
Structure factors describe how incident radiation is scattered from materials such as silicon and germanium and characterize the physical interaction between the material and scattered particles. We used neutron Pendellösung interferometry to make

Neutron Scattering Studies of Materials for Hydrogen Storage

August 28, 2021
Author(s)
Ryan Klein, Hayden Evans, Benjamin Trump, Terrence J. Udovic, Craig Brown
Hydrogen storage presents a significant barrier to the widespread adaptation of hydrogen as an energy source in mobile and stationary applications. The development of new candidate hydrogen storage materials is therefore an outstanding goal in the field of
Displaying 101 - 125 of 806