CFEL-I

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2017-03-16
15:22
OpenAccess [PUBDB-2017-01394] Journal Article
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Double-flow focused liquid injector for efficient serial femtosecond crystallography
ddc:000
Serial femtosecond crystallography requires reliable and efficient delivery of fresh crystals across the beam of an X-ray free-electron laser over the course of an experiment. We introduce a double-flow focusing nozzle to meet this challenge, with significantly reduced sample consumption, while improving jet stability over previous generations of nozzles. [...]
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2017-03-15
21:50
OpenAccess [PUBDB-2017-01388] Internal Report
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Atomic Resolution Incoherent Diffractive Imaging (IDI) via Intensity-IntensityCorrelations of Hard X-rays
The advent of accelerator-driven x-ray free-electron lasers has opened new avenues for high resolution structure determination via diffraction methods that go far beyond conventional x-ray crystallography methods. While these techniques rely on coherent scattering, incoherent processes like Compton scattering and fluorescence emission - the predominant scattering mechanism in the x-ray regime - are generally considered detrimental for imaging applications. [...]
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2017-02-13
10:11
[PUBDB-2017-00953] Journal Article
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Atomic Structure of Granulin Determined from Native Nanocrystalline Granulovirus Using an X-ray Free-Electron Laser
ddc:000
To understand how molecules function in biological systems, new methods are required to obtain atomic resolution structures from biological material under physiological conditions. Intense femtosecond-duration pulses from X-ray free-electron lasers (XFELs) can outrun most damage processes, vastly increasing the tolerable dose before the specimen is destroyed [...]

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2017-01-10
09:30
OpenAccess [PUBDB-2017-00397] Journal Article
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Strain-relief by single dislocation loops in calcite crystals grown on self-assembled monolayers
ddc:500
Most of our knowledge of dislocation-mediated stress relaxation during epitaxial crystal growth comes from the study of inorganic heterostructures. Here we use Bragg coherent diffraction imaging to investigate a contrasting system, the epitaxial growth of calcite (CaCO3) crystals on organic self-assembled monolayers, where these are widely used as a model for biomineralization processes. [...]
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2017-01-06
16:16
[PUBDB-2017-00244] Journal Article
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Configurable NOR gate arrays from Belousov-Zhabotinsky micro-droplets
ddc:530
We investigate the Belousov–Zhabotinsky (BZ) reaction in an attempt to establish a basis for computation using chemical oscillators coupled via inhibition. The system consists of BZ droplets suspended in oil. [...]
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2017-01-06
16:14
[PUBDB-2017-00243] Journal Article
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In Situ 3D Imaging of Catalysis Induced Strain in Gold Nanoparticles
ddc:530
Multielectron transfer processes are crucially important in energy and biological science but require favorable catalysts to achieve fast kinetics. Nanostructuring catalysts can dramatically improve their properties, which can be difficult to understand due to strain- and size-dependent thermodynamics, the influence of defects, and substrate-dependent activities. [...]

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2017-01-06
16:05
[PUBDB-2017-00240] Journal Article
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Fixed target combined with spectral mapping: approaching 100% hit rates for serial crystallography
ddc:570
The advent of ultrafast highly brilliant coherent X-ray free-electron laser sources has driven the development of novel structure-determination approaches for proteins, and promises visualization of protein dynamics on sub-picosecond timescales with full atomic resolution. Significant efforts are being applied to the development of sample-delivery systems that allow these unique sources to be most efficiently exploited for high-throughput serial femtosecond crystallography. [...]

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2017-01-06
16:01
[PUBDB-2017-00239] Journal Article
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Time-resolved observation of structural change of copper induced by laser shock using synchrotron radiation with dispersive XAFS
ddc:530
We report a single-shot nanosecond time-resolved dispersive XAFS measurement of copper foil under laser-induced shock compression. Obtained EXAFS results indicated clearly the structural evolution, though XANES spectra showed that the laser irradiation does not affect the copper electronic state. [...]
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2017-01-06
14:31
OpenAccess [PUBDB-2017-00233] Journal Article
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Single-distance phase retrieval algorithm for Bragg Magnifier microscope
ddc:530
We present an improved, single-distance phase retrieval algorithm applicable for holographic X-ray imaging of biological objects for an in-line germanium Bragg Magnifier Microscope (BMM). The proposed algorithm takes advantage of a modified shrink-wrap algorithm for phase objects, robust unwrapping algorithm as well as other reasonable constraints applied to the wavefield at the object and the detector plane. [...]
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2017-01-06
14:23
Embargoed OpenAccess [PUBDB-2017-00229] Journal Article
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The multitude of iron–sulfur clusters in respiratory complex I
ddc:570
Respiratory complex I couples the electron transfer from NADH to ubiquinone with the translocation of protons across the membrane. Complex I contains one non-covalently bound flavin mononucleotide and, depending on the species, up to ten iron–sulfur (Fe/S) clusters as cofactors. [...]
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