F. Willems,1,2,* C. T. L. Smeenk,2 N. Zhavoronkov,2 O. Kornilov,2 I. Radu,1 M. Schmidbauer,3 M. Hanke,4 C. von Korff Schmising,1,2,*,† M. J. J. Vrakking,2 and S. Eisebitt1,2,* 1Technische Universität Berlin, Institut für Optik und Atomare Physik, 10623 Berlin, Germany 2Max-Born-Institut, Max-Born-Strasse 2A, 12489 Berlin, Germany 3Leibniz-Institut für Kristallzüchtung, Max-Born-Strasse 2, 12489...

Recent developments in instrumentation and bioinformatics show that the technique of synchrotron radiation circular dichroism spectroscopy can provide novel information on protein secondary structures and folding motifs, and has the potential to play an important role in structural genomics studies, both as a means of target selection and as a high-throughput, low-sample-requiring screening met...

We have investigated the magnetic properties of a GaN/Ga1−xMnxN (x = 0.1) digital ferromagnetic heterostructure (DFH) showing ferromagnetic behavior using soft x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). The Mn L2,3-edge XAS spectra were similar to those of Ga1−xMnxN random alloy thin films, indicating a substitutional doping of high concentration Mn into G...

We report on the measurement of element-specific magnetic resonance spectra at gigahertz frequencies using x-ray magnetic circular dichroism (XMCD). We investigate the ferrimagnetic precession of Gd and Fe ions in Gd-substituted Yttrium Iron Garnet, showing that the resonant field and linewidth of Gd precisely coincide with Fe up to the nonlinear regime of parametric excitations. The opposite s...

The interface formation between different thicknesses of strontium titanate (SrTiO3) or titanium nitride ~TiN! with a 2000 Å Fe3O4 film is studied using x-ray absorption spectroscopy ~XAS! and x-ray magnetic circular dichroism ~XMCD!. Our results show that the deposition of 10–50 Å of TiN results in an immediate and substantial removal of oxygen from the near interface region, resulting in the ...

Although magnetism originates at the atomic scale, existing spectroscopic techniques sensitive to magnetic signals only produce spectra with spatial resolutions on a larger scale. However, recently it has been theoretically argued that atomic-size electron probes with customized phase distributions can detect electron magnetic circular dichroism (EMCD) [1]. Based on this prediction we have rece...

We present systematic investigations of the electronic and magnetic properties of the graphene/Ni(111) system by means of x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) at the Ni L2,3 and C K absorption edges. The XAS C 1s → π∗, σ∗ spectra show dramatic changes as the angle, α, between the electrical vector of light and normal of the sample is varied reflecting the s...

background: mushroom tyrosinase a potent candidate in clinical studies known as polyphenol oxidase, is a metaloenzyme from the oxidase superfamily widely distributed from lower to higher life forms. it plays a crucial role in sclerotization of exoskeleton in insects, also responsible for skin pigmentation in mammalians. objective: in this study, after reconstitution of mt by some metal ions, th...

The effects of deimination (conversion of arginyl to citrullinyl residues) of myelin basic protein (MBP) on its binding to calmodulin (CaM) have been examined. Four species of MBP were investigated: unmodified recombinant murine MBP (rmMBP-Cit0), an engineered protein with six quasi-citrullinyl (i.e., glutaminyl) residues per molecule (rmMBP-qCit6), human component C1 (hMBP-Cit0), and human com...

Interactions between three hexacationic arene ruthenium metallaprisms, [(p-cymene)6Ru6(tpt)2(dhnq)3](6+), [(p-cymene)6Ru6(tpt)2(dhbq)3](6+) and [(p-cymene)6Ru6(tpt)2(oxa)3](6+), and a series of human proteins including human serum albumin, transferrin, cytochrome c, myoglobin and ubiquitin have been studied using NMR spectroscopy, mass spectrometry and circular dichroism spectroscopy. All data ...