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3DCryoHolder: a new open access 3D printable system to store and transport silicon nitride membranes under cryogenic conditions for spectromicroscopy at low temperature.
J Synchrotron Radiat
January 2025
Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia, Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, Donostia-San Sebastian 20018, Spain.
Data acquisition under cryogenic conditions allows one to avoid unwanted damage caused by beam irradiation. This is particularly important for the study of biological samples at hard X-ray, micro- or nano-probe beamlines, which focus synchrotron radiation to small beam sizes with extremely high flux densities. Sample preparation methods for cryopreserved specimens have been adapted from electron microscopy, and include the use of silicon nitride membranes as they are easy to handle and possess low X-ray absorption.
View Article and Find Full Text PDFDevelopment and testing of a dual-frequency real-time hardware feedback system for the hard X-ray nanoprobe beamline of the SSRF.
J Synchrotron Radiat
January 2025
S.RI.Tech, Viale Del Lavoro 42A, 35010 Vigonza, Italy.
Article Synopsis
- A new real-time feedback system has been designed to enhance beam position and energy at the Shanghai Synchrotron Radiation Facility's hard X-ray nanoprobe beamline.
- The system separates the beam position signals into high-frequency and low-frequency components, which are corrected using two different types of optical components with varying inertial masses.
- Experimental results show a marked improvement in stability, reducing beam angular fluctuations significantly, from 2.21 to 0.92 µrad RMS horizontally and from 0.72 to 0.10 µrad RMS vertically.
A micro-beamstop with transmission detection by fluorescence for scanning-beam synchrotron scattering beamlines.
J Appl Crystallogr
December 2024
Aix-Marseille Univ., CNRS, Centrale Med, Institut Fresnel Marseille France.
Article Synopsis
- Quantitative X-ray diffraction techniques need careful adjustments for sample transmission, especially in SAXS and WAXS experiments.
- Typical beamstops used in X-ray nanoprobes can’t record transmission signals simultaneously with scattering data, which negatively impacts data quality.
- The paper introduces a novel small beamstop with an embedded metal target to enhance fluorescence detection, allowing for accurate sample transmission measurements using a high-sensitivity avalanche photodiode.
Construction of a N-CDs/AuNCs@ZIF-8-assisted ratiometric fluorescent nanosensor for glyphosate detection in edible and medicinal malt.
Food Chem X
December 2024
State Key Laboratory of Southwestern Chinese Medicine Resources, Pharmacy College, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China.
Glyphosate (Gly) is a widely-used herbicide in food production, while, the residue of which due to the long-term and excessive overspray poses serious threats to public health. The development of reliable methods for its sensitive detection is of great urgency. In this study, a novel ratiometric fluorescent nanosensor by encapsulating N-doped carbon dots (N-CDs) and gold nanoclusters (AuNCs) in zeolitic imidazole framework-8 (ZIF-8) as the dual-emissive fluorescence probes at 410 and 650 nm, respectively, was constructed for Gly detection.
View Article and Find Full Text PDFAlkyne-tagged SERS nanoprobe for understanding Cu and Cu conversion in cuproptosis processes.
Nat Commun
April 2024
State Key Laboratory of Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Dongchuan Road 500, Shanghai, China.
Simultaneously quantifying mitochondrial Cu and Cu levels is crucial for evaluating the molecular mechanisms of copper accumulation-involved pathological processes. Here, a series of molecules containing various diacetylene derivatives as Raman reporters are designed and synthesized, and the alkyne-tagged SERS probe is created for determination Cu and Cu with high selectivity and sensitivity. The developed SERS probe generates well-separated distinguishable Raman fingerprint peaks with built-in corrections in the cellular silent region, resulting in accurate quantification of Cu and Cu.
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