OpenAccess

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2018-02-18
12:24
OpenAccess [FZJ-2017-08171] Journal Article
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Invisible detergents for structure determination of membrane proteins by small-angle neutron scattering
The FEBS journal 285(2), 357–371 (2018) [10.1111/febs.14345]
ddc:540
A novel and generally applicable method for determining structures of membrane proteins in solution via small-angle neutron scattering (SANS) is presented. Common detergents for solubilizing membrane proteins were synthesized in isotope-substituted versions for utilizing the intrinsic neutron scattering length difference between hydrogen and deuterium. [...]

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2018-01-25
11:28
OpenAccess [FZJ-2018-00748] Journal Article
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Aβ42 pentamers/hexamers are the smallest detectable oligomers in solution
ddc:000
Amyloid β (Aβ) oligomers may play a decisive role in Alzheimer’s disease related neurodegeneration, but their structural properties are poorly understood. In this report, sedimentation velocity centrifugation, small angle neutron scattering (SANS) and molecular modelling were used to identify the small oligomeric species formed by the 42 amino acid residue long isoform of Aβ (Aβ42) in solution, characterized by a sedimentation coefficient of 2.56 S, and a radius of gyration between 2 and 4 nm. [...]

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2018-01-19
11:29
OpenAccess [FZJ-2018-00197] Journal Article
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Investigation of the spin-1 honeycomb antiferromagnet BaNi 2 V 2 O 8 with easy-plane anisotropy
ddc:530
The magnetic properties of the two-dimensional, S = 1 honeycomb antiferromagnet BaNi2V2O8 have beencomprehensively studied using dc susceptibility measurements and inelastic neutron scattering techniques. Themagnetic excitation spectrum is found to be dispersionlesswithin experimental resolution between the honeycomblayers, while it disperses strongly within the honeycomb plane where it consists of two gapped spin-wave modes.The magnetic excitations are compared to linear spin-wave theory allowing the Hamiltonian to be determined.The first- and second-neighbor magnetic exchange interactions are antiferromagnetic and lie within the ranges10.90 meV Jn 13.35 meV and 0.85 meV Jnn 1.65 meV, respectively. [...]

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2018-01-11
11:28
OpenAccess [FZJ-2017-07855] Book
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Conceptual Design Report - NOVA ERA (Neutrons Obtained Via Accelerator for Education and Research Activities) - A Jülich High Brilliance Neutron Source project
Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Schriften des Forschungszentrums Jülich Reihe Allgemeines / General, 7, 68 p. (2017)
Neutron scattering has proven to be one of the most powerful methods for the investigationof structure and dynamics of condensed matter on atomic length and time scales. A severedrawback in using neutrons is the limited possibility to access neutrons offered at nuclearresearch reactors or accelerator driven spallation sources, which are costly to build and tooperate. [...]

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2018-01-11
11:28
OpenAccess [FZJ-2017-07362] Journal Article
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Joint small-angle X-ray and neutron scattering data analysis of asymmetric lipid vesicles
ddc:540
Low- and high-resolution models describing the internal transbilayer structure of asymmetric lipid vesicles have been developed. These models can be used for the joint analysis of small-angle neutron and X-ray scattering data. [...]

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2018-01-11
11:28
Embargoed OpenAccess [FZJ-2017-07353] Journal Article
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Effect of Benzocaine and Propranolol on phospholipid-based bilayers
ddc:540
Cell membranes play a fundamental role in protecting the cell from its surroundings, in addition to host many proteins with fundamental biological tasks. A study of drug/lipid interactions is a necessary and important step to fully clarify the role and action mechanism of active ingredients, as well as to shed light on possible complications caused by drug overdosage. [...]

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2018-01-05
11:28
OpenAccess [FZJ-2018-00064] Journal Article
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Spectrometers for compact neutron sources
ddc:530
We discuss the potential for neutron spectrometers at novel accelerator driven compact neutron sources. Such a High Brilliance Source (HBS) relies on low energy nuclear reactions, which enable cryogenic moderators in very close proximity to the target and neutron optics at comparably short distances from the moderator compared to existing sources [...]

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2017-12-22
11:28
OpenAccess [FZJ-2017-08585] Preprint
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Spin dependence of {\eta} meson production in proton-proton collisions close to threshold
Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp{\eta} has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than one order of magnitude with respect to previous results allowing a first accurate comparison with theoretical predictions. [...]

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2017-12-14
11:28
OpenAccess [FZJ-2017-08272] Journal Article
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Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe$_{0.9785}$Co$_{0.0215}$As
ddc:530
We use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As, with coexisting superconductivity (Tc≈19 K) and weak antiferromagnetic order (TN≈30 K, ordered moment ≈0.02μB/Fe). A single spin resonance mode with intensity tracking the superconducting order parameter is observed, although energy of the mode only softens slightly upon approaching Tc. [...]

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2017-12-14
11:28
OpenAccess [FZJ-2017-08258] Journal Article
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Magnetic excitations in the ground state of Yb$_{2}$ Ti$_{2}$ O$_{7}$
ddc:530
We report an extensive study on the zero field ground state of a powder sample of the pyrochlore Yb$_{2}$Ti$_{2}$O$_{7}$. A sharp heat capacity anomaly that labels a low temperature phase transition in this material is observed at 280 mK. [...]

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