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2019-06-13
13:23
[PUBDB-2019-02474] Journal Article
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Structural and Mechanistic Basis for Anaerobic Ergothioneine Biosynthesis
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ddc:540
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2019-06-11
18:06
[PUBDB-2019-02457] Journal Article
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Allanite at high pressure: effect of REE on the elastic behaviour of epidote-group minerals
The compressional behaviour of a natural allanite from Lago della Vecchia (upper Cervo valley, Italy) metagranitoids[A1(Ca0.69Fe2+0.31)Σ1.00A2(Ca0.46Ce0.24La0.12Sm0.02Pr0.05Nd0.09Th0.02)Σ1.00M1(Al0.65Fe3+0.34Ti0.02)Σ1.01M2(Al0.99)M3(Fe3+0.54Fe2+0.36Mg0.06Ti4+0.02Al0.01)Σ0.99 Si1,Si2,Si3(Si2.80Al0.20)Σ3.00O11(OH,O)] has been investigated up to 16 GPa (at 298 K) by means of in situsynchrotron single-crystal X-ray diffraction. Experiments have been conducted under hydrostatic conditions, using a diamondanvil cell and the mix methanol:ethanol:water = 16:3:1 (up to 10 GPa) and neon (up to 16 GPa) as pressure-transmittingmedia. [...]
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ddc:530
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2019-06-06
15:30
[PUBDB-2019-02429] Journal Article
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MicroX-ray absorption near edge structure tomography reveals cell-specific changes of Zn ligands in leaves of turnip yellow mosaic virus infected plants
As many metals are essential for plants, excess or deficiency of them or alteration of their uptake, translocation, sequestration or physiological use can have severe consequences for plant growth and fitness. Therefore, investigating the distribution and speciation of metals in tissues is essential to understand plant physiology. [...]
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ddc:530
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2019-06-06
13:25
[PUBDB-2019-02425] Journal Article
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Synchrotron X-ray fluorescence mapping of Ca, Sr and Zn at the neonatal line in human deciduous teeth reflects changing perinatal physiology
Objectives: Our first objective was to review the evidence describing the appearance and microstructure of theneonatal line in human deciduous teeth and to link this with known changes in neonatal physiology occurring atand around birth. A second objective was to explore ways to improve identification of the neonatal line bymapping the pre- and postnatal distribution of Ca, Sr and Zn in deciduous cuspal enamel and superimposingthese maps onto transmitted light micrographs that included a clear true section of the neonatal line.Materials and methods: We used synchrotron X-ray fluorescence to map elemental distributions in pre- andpostnatal enamel and dentine. [...]
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ddc:610
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2019-06-06
11:13
[PUBDB-2019-02423] Journal Article
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The first fossil free-living late instar larva of Strepsiptera (Insecta)
A fossil Cenozoic late instar strepsipteran larva is described and evaluated phylogenetically. The single specimen is embedded in Eocene Baltic amber. [...]
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ddc:590
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2019-06-04
14:06
OpenAccess [PUBDB-2019-02412] Journal Article
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Characterization of Native Oxide and Passive Film on Austenite/Ferrite Phases of Duplex Stainless Steel Using Synchrotron HAXPEEM
A new measurement protocol was used for microscopic chemical analysis of surface oxide films with lateral resolution of 1 μm.The native air-formed oxide and an anodic passive film on austenite and ferrite phases of a 25Cr-7Ni super duplex stainless steelwere investigated using synchrotron hard X-ray photoemission electron microscopy (HAXPEEM). Pre-deposited Pt-markers, incombination with electron backscattering diffraction mapping (EBSD), allowed analysis of the native oxide on individual grains ofthe two phases and the passive film formed on the same area after electrochemical polarization of the sample. [...]
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ddc:660
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2019-06-03
21:21
OpenAccess [PUBDB-2019-02410] Journal Article
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Photoionization and photofragmentation of singly charged positive and negative Sc$_3$N@C$_{80}$ endohedral fullerene ions
Photoprocesses of the endohedral fullerene ions Sc$_3$N@C$_{80}^+$ and Sc$_3$N@C$_{80}^-$ in the gas phase have been investigated in the photon energy ranges 30--50 eV and 280--420 eV. Single and double ionization as well as single ionization accompanied by the release of a C$_2$ dimer were observed as a function of the photon energy for the positive parent ion and double detachment was measured for the negative parent ion. [...]
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ddc:530
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2019-05-28
18:36
OpenAccess [PUBDB-2019-02386] Dissertation / PhD Thesis

Lithium- and oxygen-driven structural evolution in Co-free Li-Mn-rich oxides as cathodes for lithium ion batteries
Karlsruhe 121 pp. () [10.5445/IR/1000094410] = Dissertation, Karlsruhe Institute of Technology (KIT), 2019  GO
Nowadays, the lithium-rich layered 3d-transition-metal (TM) oxides (LLOs) are regarded as one of the most attractive cathode materials for next-generation lithium-ion batteries (LIBs), because they can exhibit a discharge capacity (approaching 300 mAh g$^{-1}$ at 0.1 C) much higher than that of the currently used materials(~ 180 mAh g$^{-1}$at 0.1 C). However, the formation mechanism of LLOs has not been fully understood on a fundamental level yet.One of the most interesting and still open questionsis aboutlithium and oxygen atoms are incorporatedinto the precursor’s crystal structure during the synthesisoffinal LLO products.Asystematic exploration of this subject was conducted in this PhD work. [...]
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2019-05-27
17:38
[PUBDB-2019-02382] Journal Article
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MicroX-ray absorption near edge structure tomography reveals cell-specific changes of Zn ligands in leaves of turnip yellow mosaic virus infected plants
As many metals are essential for plants, excess or deficiency of them or alteration of their uptake, translocation, sequestration or physiological use can have severe consequences for plant growth and fitness. Therefore, investigating the distribution and speciation of metals in tissues is essential to understand plant physiology. [...]
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ddc:530
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2019-05-26
07:50
[PUBDB-2019-02368] Journal Article
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The photon‐ion merged‐beams experiment PIPE at PETRA III—The first five years
X-ray spectrometry XXX, xrs.3035 () [10.1002/xrs.3035]  GO
The Photon-Ion Spectrometer at PETRAIII—in short, PIPE—is a permanentlyinstalled user facility at the "Variable Polarization XUV Beamline" P04 of thesynchrotron light source PETRA III operated by DESY in Hamburg, Germany.The careful design of the PIPE ion-optics in combination with the record-highphoton flux at P04 has lead to a breakthrough in experimental studies ofphoton interactions with ionized small quantum systems. This short reviewprovides an overview over the published scientific results from photon-ionmerged-beams experiments at PIPE that were obtained since the start of P04operations in 2013. [...]
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ddc:530
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