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Neutron research

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Displaying 376 - 400 of 914

ROTDIF-web and ALTENS: GenApp-based Science Gateways for Biomolecular Nuclear Magnetic Resonance (NMR) Data Analysis and Structure Modeling

September 23, 2019
Author(s)
Yuexi Chen, Cheol Jeong, Alexey Savelyev, Susan T. Krueger, Joseph E. Curtis, Emre H. Brookes, David Fushman
Proteins and nucleic acids participate in essentially every biochemical process in living organisms, and the elucidation of their structure and motions is essential for our understanding how these molecular machines perform their function. Nuclear Magnetic

Tailoring Biomimetic Phosphorylcholine-Containing Block Copolymers as Membrane-Targeting Cellular Rescue Agents

September 9, 2019
Author(s)
Jia-Yu Wang, Wei Chen, Michihiro Nagao, Phullara Shelat, Brenton A. G. Hammer, Gregory T. Tietjen, Kathleen Cao, J. Michael Henderson, Lilin He, Binhua Lin, Bulent Akgun, Mati Meron, Shuo Qian, Sarah Ward, Jeremy D. Marks, Todd Emrick, Ka Yee C. Lee
Some synthetic polymers have been found capable of rescuing injured cells from death by targeting cell membranes. However, general principles for designing synthetic polymers to ensure strong, but non-disruptive cell membrane targeting unknown. Here, we

Accessing New Charge-Transfer Complexes by Mechanochemistry: A Tetrathiafulvalene Chloranilic Acid Polymorph Containing Segregated Tetrathiafulvalene Stacks

September 4, 2019
Author(s)
Jeffrey Jones, Vinh Ta Phuoc, Leire del Campo, Nestor E. Massa, Craig Brown, Silvina Pagola
Two polymorphs of tetrathiafulvalene chloranilic acid (ITF-CAH 2) have been synthesized by mechanochemistry. The previously known "ionic" polymorph (form I), was prepared by liquid assisted grinding (LAG) using various highly polar solvents; as well as

Protein Translocation Activity in Surface-Supported Lipid Bilayers

August 25, 2019
Author(s)
Kanokporn Chattrakun, David Hoogerheide, Chunfeng Mao, Linda L. Randall, Gavin M. King
Surface-supported lipid bilayers are used widely throughout the nanoscience community as robust mimics of cellular membrane. For example, they are frequently employed in single molecule atomic force microscopy (AFM) studies to shed light on membrane

Disentangling Polymer Network and Hydration Water Dynamics in Polyhydroxyethyl Methacrylate Physical and Chemical Hydrogels

August 8, 2019
Author(s)
Daria Noferini, Antonio Faraone, Marta Rossi, Eugene Mamontov, Emiliano Fratini, Piero Baglioni
Cross-linker nature and water content may impact the microscopic dynamics of hydrogels components, and thus their properties in applications such as drug-delivery. To investigate this aspect, we used quasi-elastic neutron scattering with contrast variation

Low-Temperature Rotational Tunneling of Tetrahydroborate Anions in Lithium Benzimidazolate-Borohydride Li 2 (blm)BH 4

August 7, 2019
Author(s)
Alexander V. Skripov, Mirjana NMN Dimitrievska, Olga A. Babanova, R. V. Skoryunov, Alexei V. Soloninin, Fabrice Morelle, Y. Filinchuk, Antonio Faraone, Hui Wu, Wei Zhou, Terrence J. Udovic
To investigate the dynamical properties of the novel hybrid compound, lithium benzimidazolate-borohydride Li 2(bIm)BH 4 (where bIm denotes a benzimidazolate anion, C 7N 2H 5u-^), we have used a set of complementary techniques: neutron powder diffraction

BEES: Bayesian Ensemble Estimation from SAS

August 6, 2019
Author(s)
Samuel Bowerman, Joseph E. Curtis, Joseph Clayton, Emre H. Brookes, Jeff Wereszczynski
Many biomolecular complexes exhibit a flexible ensemble of conformations in solution in order to conduct their biological function. Small angle scattering (SAS) measurements are a popular method for characterizing these flexible molecules due to their

Experimental Upper Bound and Theoretical Expectations for Parity-Violating Neutron Spin Rotation in He-4

July 16, 2019
Author(s)
Jeffrey S. Nico, Hans P. Mumm, H E. Swanson, C. D. Bass, T. D. Bass, J M. Dawkins, J C. Horton, D Luo, William M. Snow, S. C. Walbridge, B. E. Crawford, K. F. Gan, A M. Micherdzinska, C. R. Huffer, D M. Markoff, Murad Sarsour, E I. Sharapov, V Zhumabekova, Blayne R. Heckel
Neutron spin rotation is expected from quark-quark weak interactions in the Standard Model, which induce weak interactions among nucleons that violate parity. We present the results from an experiment searching for the effect of parity violation via the

Understanding Gas Storage in Cuboctahedral Porous Coordination Cages

July 4, 2019
Author(s)
Gregory R. Lorzing, Eric J. Gosselin, Benjamin Trump, Arthur H. P. York, Arni Sturluson, Casey A. Rowland, Glenn P. A. Yap, Craig Brown, Cory M. Simon, Eric D. Bloch
Porous molecular solids are promising molecular solids are promising materials for gas storage applications. However, given the relative dearth of studies concerning these materials in this regard, additional adsorption and structural studies are vital for

Disordered Heterogeneous Materials

July 1, 2019
Author(s)
Andrew J. Allen
This chapter describes the use of diffraction-based methods to characterize amorphous or disordered heterogeneous materials. Quantitative materials microstructure characterization using small-angle scattering methods is emphasized. While these techniques

Structural Investigations of Membrane-Associated Proteins by Neutron Reflectometry

July 1, 2019
Author(s)
Rebecca Eells, David Hoogerheide, Paul A. Kienzle, Mathias Loesche, Charles Majkrzak, Frank Heinrich
Neutron reflectometry is a powerful technique for probing the structure of lipid bilayer membranes and membrane-associated proteins. Measurements of the specular neutron reflectivity as a function of momentum transfer can be performed in aqueous

Wide-Angle Polarization Analysis on the Multi-Axis Crystal Spectrometer for the Study of Collective and Single Particle Dynamics of Methanol at its Prepeak

July 1, 2019
Author(s)
Wangchun Chen, Shannon M. Watson, Yiming Qiu, Jose Rodriguez Rivera, Antonio Faraone
Neutron polarization analysis capability with a large scattering angle and momentum transfer coverage has not been widely implemented for the separation of coherent and incoherent quasi-elastic neutron scattering (QENS) spectra. A feasibility test for soft

Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li 2 SrNb 2 O 7

June 25, 2019
Author(s)
Ritesh Uppuluri, Hirofumi Akamatsu, Arnab Sen Gupta, Huaiyu Wang, Craig Brown, Kleyser E. Agueda Lopez, Nasim Alem, Venkatraman Gopalan, Thomas E. Mallouk
Over the past few years, several studies have reported the existence of polar phase in n=2 Ruddlesden-Popper layer perovskites by trilinear coupling of oxygen octahedral rotations (OOR) and polar distortions, a phenomenon termed as hybrid improper

Electron Doping BaZrO 3 via Topochemical Reduction

June 19, 2019
Author(s)
Thomas Orvis, Mythili Surendran, Yang Liu, Shanyuan Niu, Shinichiro Muramoto, Alexander Grutter, Jayakanth Ravichandran
We report the topochemical reduction of epitaxial thin films of the cubic perovskite BaZrO 3. Reduction with calcium hydride yields n-type conductivity in the films, despite the wide bandgap and low electron affinity of the parent material. X-ray

Superconductivity in a Unique Type of Copper Oxide

June 18, 2019
Author(s)
W. M. Li, J. F. Zhao, L. P. Cao, Z. Hu, Qingzhen Huang, X. C. Wang, Y. Liu, G. Q. Zhao, J. Zhang, Q. Q. Liu, R. Z. Yu, Y. W. Long, Hui Wu, H. J. Lin, C. T. Chen, Z. Li, Z. Z. Gong, Z. Guguchia, J. S. Kim, G. R. Stewart, Y. J. Uemura, S. Uchida, C. Q. Jin
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