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2018-05-16
11:19
[PUBDB-2018-01982] Journal Article
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The impact of steeping, germination and hydrothermal processing of wheat (Triticum aestivum L.) grains on phytate hydrolysis and the distribution, speciation and bio-accessibility of iron and zinc elements
Chelation of iron and zinc in wheat as phytates lowers their bio-accessibility. Steeping and germination (15 °C, 120 h) lowered phytate content from 0.96% to only 0.81% of initial dry matter [...]
ddc:540
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2018-05-11
10:20
OpenAccess [PUBDB-2018-01940] Journal Article
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X-ray and UV radiation-damage-induced phasing using synchrotron serial crystallography
Specific radiation damage can be used to determine phases de novo from macromolecular crystals. This method is known as radiation-damage-induced phasing (RIP). [...]
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ddc:570
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2018-05-02
12:42
OpenAccess [PUBDB-2018-01892] Journal Article
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Fast XANES fluorescence imaging using a Maia detector
A new fast X-ray absorption spectroscopy scanning method was recently implemented at the Hard X-ray Microprobe endstation P06, PETRA III, DESY, utilizing a Maia detector. Spectromicroscopy maps were acquired with spectra for X-ray absorption near-edge structure (XANES) acquisition in the sub-second regime. [...]
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ddc:540
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2018-04-20
10:07
[PUBDB-2018-01797] Journal Article
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LAMBDA 2M GaAs—A multi-megapixel hard X-ray detector for synchrotrons
11th International Conference on Position Sensitive Detectors, PSD11, Walton Hall, Milton KeynesWalton Hall, Milton Keynes, UK, 3 Sep 2017 - 8 Sep 20172017-09-032017-09-08 Journal of Instrumentation 13(01), C01026 - C01026 () [10.1088/1748-0221/13/01/C01026]  GO
Synchrotrons can provide very intense and focused X-ray beams, which can be used tostudy the structure of matter down to the atomic scale. In many experiments, the quality of theresults depends strongly on detector performance; in particular, experiments studying dynamics ofsamples require fast, sensitive X-ray detectors.“LAMBDA” is a photon-counting hybrid pixel detector system for experiments at synchrotrons,based on the Medipix3 readout chip. [...]
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ddc:610
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2018-04-20
10:03
Embargoed OpenAccess [PUBDB-2018-01796] Journal Article
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Behaviour of niobium during early Earth’s differentiation: insights from its local structure and oxidation state in silicate melts at high pressure
Niobium (Nb) is one of the key trace elements used to understand Earth’s formation and differentiation, and is remarkable for its deficiency relative to tantalum in terrestrial rocks compared to the building chondritic blocks. In this context, the local environment of Nb in silica-rich melts and glasses is studied by in situ x-ray absorption spectroscopy (XAS) at high pressure (P) up to 9.3 GPa and 1350 K using resistive-heating diamond-anvil cells. [...]
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ddc:530
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2018-04-18
18:06
[PUBDB-2018-01788] Journal Article
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Attosecond time–energy structure of X-ray free-electron laser pulses
Nature photonics 12(4), 215 - 220 () [10.1038/s41566-018-0107-6]  GO
The time–energy information of ultrashort X-ray free-electron laser pulses generated by the Linac Coherent Light Source is measured with attosecond resolution via angular streaking of neon 1s photoelectrons. The X-ray pulses promote electrons from the neon core level into an ionization continuum, where they are dressed with the electric field of a circularly polarized infrared laser. [...]
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ddc:530
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2018-04-18
15:22
OpenAccess [PUBDB-2018-01787] Journal Article
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Multidimensional photoemission spectroscopy—the space-charge limit
Photoelectron spectroscopy, especially at pulsed sources, is ultimately limited by the Coulomb interaction in the electron cloud, changing energy and angular distribution of the photoelectrons. A detailed understanding of this phenomenon is crucial for future pump–probe photoemission studies at (x-ray) free electron lasers and high-harmonic photon sources. [...]
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ddc:530
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2018-04-11
15:06
[PUBDB-2018-01690] Journal Article
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Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?
Abstract–Coesite and stishovite are high-pressure silica polymorphs known to have beenformed at several terrestrial impact structures. They have been used to assess pressure andtemperature conditions that deviate from equilibrium formation conditions. [...]
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ddc:520
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2018-03-27
14:42
OpenAccess [PUBDB-2018-01584] Journal Article
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Identification of a Catalytically Highly Active Surface Phase for CO Oxidation over PtRh Nanoparticles under Operando Reaction Conditions
Pt-Rh alloy nanoparticles on oxide supports are widely employed in heterogeneous catalysis with applications ranging from automotive exhaust control to energy conversion. To improve catalyst performance, an atomic-scale correlation of the nanoparticle surface structure with its catalytic activity under industrially relevant operando conditions is essential [...]
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ddc:550
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2018-03-23
17:38
[PUBDB-2018-01552] Journal Article
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Evidence for {100}<011> slip in ferropericlase in Earth's lower mantle from high-pressure/high-temperature experiments
Seismic anisotropy in Earth's lowermost mantle, resulting from Crystallographic Preferred Orientation (CPO) of elastically anisotropic minerals, is among the most promising observables to map mantle flow patterns. A quantitative interpretation, however, is hampered by the limited understanding of CPO development in lower mantle minerals at simultaneously high pressures and temperatures. [...]
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