Hard x-ray nanoprobe of beamline P06 at PETRA III

Schroer, Christian G.; Baumbach, Christoph; Döhrmann, Ralph; Klare, Susanne; Hoppe, Robert; Kahnt, Maik; Patommel, Jens; Reinhardt, Juliane; Ritter, Stephan; Samberg, D.; Scholz, Maria Brígida dos Santos; Schropp, Andreas; Seiboth, Frank; Seyrich, Martin; Wittwer, Felix; Falkenberg, Gerald

doi:10.1063/1.4952830

Cited by 34 publications

(31 citation statements)

References 17 publications

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“…Thin sections (2–10 μm in thickness) were obtained with a microtome from all unaged/aged samples and analyzed by combining SR‐based μ‐XRF/μ‐XANES at the S K‐ and Cd L 3 ‐edges (scanning X‐ray microscope end‐station of beamline ID21 at ESRF, Grenoble) and SR‐based μ‐XRD mapping (μ‐XRD/μ‐XRF end‐station of beamline ID21‐ESRF and beamline P06‐PETRA III at DESY, Hamburg) …”

Section: Methodsmentioning

confidence: 99%

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd_1−xZn_xS) in Oil Paintings

Monico

Chieli

Meyer

et al. 2018

Chemistry A European J

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Cadmium yellows (CdYs) refer to a family of cadmium sulfide pigments, which have been widely used by artists since the late 19th century. Despite being considered stable, they are suffering from discoloration in iconic paintings, such as Joy of Life by Matisse, Flowers in a blue vase by Van Gogh, and The Scream by Munch, most likely due to the formation of CdSO ⋅n H O. The driving factors of the CdYs degradation and how these affect the overall process are still unknown. Here, we study a series of oil mock-up paints made of CdYs of different stoichiometry (CdS/Cd Zn S) and crystalline structure (hexagonal/cubic) before and after aging at variable relative humidity under exposure to light and in darkness. Synchrotron radiation-based X-ray methods combined with UV-Vis and FTIR spectroscopy show that: 1) Cd Zn S is more susceptible to photooxidation than CdS; both compounds can act as photocatalysts for the oil oxidation. 2) The photooxidation of CdS/Cd Zn S to CdSO ⋅n H O is triggered by moisture. 3) The nature of alteration products depends on the aging conditions and the Cd/Zn stoichiometry. Based on our findings, we propose a scheme for the mechanism of the photocorrosion process and the photocatalytic activity of CdY pigments in the oil binder. Overall, our results form a reliable basis for understanding the degradation of CdS-based paints in artworks and contribute towards developing better ways of preserving them for future generations.

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Section: Methodsmentioning

confidence: 99%

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd_1−xZn_xS) in Oil Paintings

Monico

Chieli

Meyer

et al. 2018

Chemistry A European J

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“…X-ray exposures were performed at the 17-BM X-ray footprinting (XFP) beamline of the National Synchrotron Light Source II using a high-throughput apparatus at room temperature (55). After irradiation, samples were immediately frozen in liquid nitrogen and stored at Ϫ80°C.…”

Section: Hydroxyl Radical Footprintingmentioning

confidence: 99%

Structural attributes of mammalian prion infectivity: Insights from studies with synthetic prions

Wang

Xiao

et al. 2018

Journal of Biological Chemistry

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Edited by Ursula JakobPrion diseases are neurodegenerative disorders that affect many mammalian species. Mammalian prion proteins (PrPs) can misfold into many different aggregates. However, only a small subpopulation of these structures is infectious. One of the major unresolved questions in prion research is identifying which specific structural features of these misfolded protein aggregates are important for prion infectivity in vivo. Previously, two types of proteinase K-resistant, self-propagating aggregates were generated from the recombinant mouse prion protein in the presence of identical cofactors. Although these two aggregates appear biochemically very similar, they have dramatically different biological properties, with one of them being highly infectious and the other one lacking any infectivity. Here, we used several MS-based structural methods, including hydrogen-deuterium exchange and hydroxyl radical footprinting, to gain insight into the nature of structural differences between these two PrP aggregate types. Our experiments revealed a number of specific differences in the structure of infectious and noninfectious aggregates, both at the level of the polypeptide backbone and quaternary packing arrangement. In particular, we observed that a high degree of order and stability of ␤-sheet structure within the entire region between residues ϳ89 and 227 is a primary attribute of infectious PrP aggregates examined in this study. By contrast, noninfectious PrP aggregates are characterized by markedly less ordered structure up to residue ϳ167. The structural constraints reported here should facilitate development of experimentally based high-resolution structural models of infectiosus mammalian prions.

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“…Synchrotron micro X-ray fluorescence µ-XRF was carried out at the Hard X-ray microprobe beamline P06 of the synchrotron source PETRA III, DESY (Deutsches Elektronen-Synchrotron, Hamburg, Germany) [32]. Experimental parameters of the setup are summarized in Table 2.…”

Section: In Situ High Energy Synchrotron X-ray Diffractionmentioning

confidence: 99%

Role of element partitioning on the α–β phase transformation kinetics of a bi-modal Ti–6Al–6V–2Sn alloy during continuous heating

Barriobero-Vila

Requena

Buslaps

et al. 2015

Journal of Alloys and Compounds

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Hard x-ray nanoprobe of beamline P06 at PETRA III

Cited by 34 publications

References 17 publications

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd_1−xZn_xS) in Oil Paintings

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd_1−xZn_xS) in Oil Paintings

Structural attributes of mammalian prion infectivity: Insights from studies with synthetic prions

Role of element partitioning on the α–β phase transformation kinetics of a bi-modal Ti–6Al–6V–2Sn alloy during continuous heating

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Hard x-ray nanoprobe of beamline P06 at PETRA III

Cited by 34 publications

References 17 publications

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd1−xZnxS) in Oil Paintings

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd1−xZnxS) in Oil Paintings

Structural attributes of mammalian prion infectivity: Insights from studies with synthetic prions

Role of element partitioning on the α–β phase transformation kinetics of a bi-modal Ti–6Al–6V–2Sn alloy during continuous heating

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Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd_1−xZn_xS) in Oil Paintings

Role of the Relative Humidity and the Cd/Zn Stoichiometry in the Photooxidation Process of Cadmium Yellows (CdS/Cd_1−xZn_xS) in Oil Paintings