29,094 results match your criteria x-ray fluorescence


Biofortification quality in bananas monitored by energy-dispersive X-ray fluorescence and chemometrics.

Food Chem 2021 Jun 2;362:130172. Epub 2021 Jun 2.

São Paulo State University (UNESP), Institute of Chemistry, Group of Alternative Analytical Approaches (GAAA), Bioenergy Research Institute (IPBEN), Av. Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo CEP: 14.800-060, Brazil; National Institute of Alternative Technologies for Detection Toxicological Assessment and Removal of Micropollutants and Radioactive Substances (INCT-DATREM), São Paulo State University (UNESP), Institute of Chemistry, Av. Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo, CEP: 14.800-060, Brazil. Electronic address:

Biofortification is a nutritional strategy used to enhance nutrients in a variety of staple foods. As bananas and plantains (Musa spp.) are considered staple food in many developing countries, monitoring zinc (Zn) content in biofortified bananas is crucial to ensure this mineral intake. Read More

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mTRIP, an Imaging Tool to Investigate Mitochondrial DNA Dynamics in Physiology and Disease at the Single-Cell Resolution.

Methods Mol Biol 2021 ;2275:247-263

Institut Pasteur, Stem Cells and Development, Department of Developmental and Stem Cell Biology, CNRS UMR3738 Team "Stability of Nuclear and Mitochondrial DNA", Paris, France.

Mitochondrial physiology and metabolism are closely linked to replication and transcription of mitochondrial DNA (mtDNA). However, the characterization of mtDNA processing is poorly defined at the single-cell level. We developed mTRIP (mitochondrial Transcription and Replication Imaging Protocol), an imaging approach based on modified fluorescence in situ hybridization (FISH), which simultaneously reveals mitochondrial structures committed to mtDNA initiation of replication as well as the mitochondrial RNA (mtRNA) content at the single-cell level in human cells. Read More

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January 2021

Infrared-Emitting Multimodal Nanostructures for Controlled In Vivo Magnetic Hyperthermia.

Adv Mater 2021 Jun 12:e2100077. Epub 2021 Jun 12.

Nanomaterials for Bioimaging Group (nanoBIG), Universidad Autónoma de Madrid, Madrid, 28049, Spain.

Deliberate and local increase of the temperature within solid tumors represents an effective therapeutic approach. Thermal therapies embrace this concept leveraging the capability of some species to convert the absorbed energy into heat. To that end, magnetic hyperthermia (MHT) uses magnetic nanoparticles (MNPs) that can effectively dissipate the energy absorbed under alternating magnetic fields. Read More

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Electron-Deficient Heteroacenes that Contain Two Boron Atoms: Near-Infrared Fluorescence Based on a Push-Pull Effect.

Angew Chem Int Ed Engl 2021 Jun 11. Epub 2021 Jun 11.

Nagoya University, Department of Chemistry Graduate School of Science, Furo, Chikusa, 464-8602, Nagoya, JAPAN.

Electron-deficient heteroacenes that contain two tricoordinate boron atoms in their acene skeletons and planarized phenyl ether moieties at their periphery were synthesized via the borylation of silicon-bridged precursors. X-ray crystallographic analysis revealed quinoidal structures, which give rise to two-step  reversible redox processes for both the reduction and oxidation . These compounds exhibit intense absorption and sharp fluorescence bands with vibronic structures in the near-infrared (NIR) region. Read More

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Mineralogy, geochemistry, C and O isotopic characteristics of urinary stones in Iran, a case study of Lorestan Province.

Environ Geochem Health 2021 Jun 11. Epub 2021 Jun 11.

Department of Environment, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.

Owing to the importance of urinary stones as one of the biominerals in the human body, it is necessary to investigate their chemical composition and mineralogy. In this matter, a mineralogical study using X-ray diffraction and scanning electron microscopy indicated that urinary stones in Lorestan Province were divided into 5 groups of calcium oxalate, urate, cysteine, phosphate and mixed stones (Whewellite, uric acid, phosphate). In this regard, the microscopic studies revealed that Whewellite was the most important mineral phase among various phases. Read More

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Self-Assembled Growing DNA Tree Mediated by Exosomes for Amplified Imaging of Messenger RNA in Living Cells.

Anal Chem 2021 Jun 11. Epub 2021 Jun 11.

Department of Clinical Laboratory Medicine, Shanghai Tenth People's Hospital of Tongji University, Shanghai 200072, P. R. China.

Sensitive, accurate, and nondestructive probing of endogenous messenger RNA (mRNA) in living cells places extremely high demands on nanocarriers and probes and is still a challenge. In the present study, we describe a target-triggered self-assembled DNA tree for amplified analysis of mRNA in intact living cells. The probes assembled into a DNA tree are transported into cells by exosomes, which is beneficial for reducing cell damage and realizing nondestructive analysis. Read More

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X-ray-activated persistent luminescence nanomaterials for NIR-II imaging.

Nat Nanotechnol 2021 Jun 10. Epub 2021 Jun 10.

Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers and iChem, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China.

Persistent luminescence is not affected by background autofluorescence, and thus holds the promise of high-contrast bioimaging. However, at present, persistent luminescent materials for in vivo imaging are mainly bulk crystals characterized by a non-uniform size and morphology, inaccessible core-shell structures and short emission wavelengths. Here we report a series of X-ray-activated, lanthanide-doped nanoparticles with an extended emission lifetime in the second near-infrared window (NIR-II, 1,000-1,700 nm). Read More

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Insights into biogenic and diagenetic lead exposure in experimentally altered modern and archaeological bone: Synchrotron radiation X-ray fluorescence imaging.

Sci Total Environ 2021 Jun 1;790:148144. Epub 2021 Jun 1.

Department of Anatomy, Physiology, and Pharmacology, University of Saskatchewan, 107 Wiggins Road, Saskatoon S7N 5E5, SK, Canada. Electronic address:

Bones represent a valuable biological archive of environmental lead (Pb) exposure for modern and archaeological populations. Synchrotron radiation X-ray fluorescence imaging (SR-XFI) generates maps of Pb in bone on a microstructural scale, potentially providing insights into an individual's history of Pb exposure and, in the context of archaeological bone, the biogenic or diagenetic nature of its uptake. The aims of this study were to (1) examine biogenic spatial patterns for Pb from bone samples of modern cadavers compared with patterns observed archaeologically, and (2) test the hypothesis that there are spatial differences in the distribution of Pb for diagenetic and biogenic modes of uptake in bone. Read More

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A unique case of adamantinoma-like Ewing sarcoma in the calcaneus, exhibiting prominent squamous differentiation and displaying EWSR1 gene rearrangement.

Skeletal Radiol 2021 Jun 10. Epub 2021 Jun 10.

Sparsh Orthopedic Oncology, Ahmedabad, Gujrat, India.

Adamantinoma-like Ewing sarcoma is uncommonly reported in the skeletal sites, including small bones of the feet.A 15-year-old girl presented with pain and swelling in her left foot, leading to difficulty in walking for 8 months. Plain radiograph revealed an ill-defined, lytic-sclerotic lesion without significant periosteal reaction in her left calcaneus. Read More

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Synthesis & Structure-Photophysics Evaluation on 2-N-Aminoquinazolines - Small-Molecule Fluorophores for Solution and Solid State.

Chem Asian J 2021 Jun 9. Epub 2021 Jun 9.

Sophia University Faculty of Science and Technology Graduate School of Science and Technology Department of Mathematics: Jochi Daigaku Riko Gakubu Rikogaku Kenkyuka, Life and Material Sciences, Tokyo, JAPAN.

2- N -aminoquinazolines were prepared by consecu-tive S N Ar functionalization. X-ray structures display the nitrogen lone pair of the 2- N -morphilino group in conjugation with the electron defi-cient quinazoline core and thus representing electronic push-pull sys-tems. 2- N -aminoquinazolines show a positive solvatochromism and are flu-orescent in solution and in solid state with quantum yields up to 0. Read More

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Mid-Infrared Luminescence of the High Stability Perovskite CsPbErBr-ZrF-BaF-LaF-AlF-NaF Fluoride Glass.

ACS Appl Mater Interfaces 2021 Jun 9. Epub 2021 Jun 9.

School of Materials Science and Engineering, Institute of Material Physics, Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, and Tianjin Key Laboratory for Photoelectric Materials and Devices, and National Demonstration Center for Experimental Function Materials Education, Tianjin University of Technology, Tianjin 300384, China.

Perovskites have been studied because of their adjustable wavelength range, high color purity, and wide color gamut. However, they still face some problems such as poor stability and insufficient infrared luminescence. The perovskite glass can improve the stability and luminescence properties of the perovskite. Read More

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Facile and scalable design of light-emitting and ROS-generating hybrid materials made of polyurea gels embedding a molybdenum cluster-based salt.

Dalton Trans 2021 Jun 9. Epub 2021 Jun 9.

Universidade de Franca, Av. Dr Armando Salles Oliveira 201, 14404-600 Franca, SP, Brazil.

Here, we demonstrate a facile and scalable preparation via sol-gel chemistry of hybrid polyurea gels containing various amounts of a phosphorescent inorganic octahedral molybdenum cluster-based ternary salt, namely Cs2Mo6Br14. The influence of the Cs2Mo6Br14 content (1-10 wt%) on the polyurea matrix and its physical properties are studied in depth by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and X-ray fluorescence microanalysis (μ-XRF). Regardless of the amount of cluster loaded into the polyurea, the integrity of these species was preserved and their dispersion is homogeneous as shown by μ-XRF mapping. Read More

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Removal of Cd(II), Cu(II), and Pb(II) by adsorption onto natural clay: a kinetic and thermodynamic study.

Turk J Chem 2021 28;45(2):362-376. Epub 2021 Apr 28.

Department of Chemistry, Faculty of Science, Ibn Tofail University, Kenitra Morocco2.

In this work, we study the elimination of three bivalent metal ions (Cd, Cu, and Pb) by adsorption onto natural illitic clay (AM) collected from Marrakech region in Morocco. The characterization of the adsorbent was carried out by X-ray fluorescence, Fourier transform infrared spectroscopy and X-ray diffraction. The influence of physicochemical parameters on the clay adsorption capacity for ions Cd, Cu, and Pb, namely the adsorbent dose, the contact time, the initial pH imposed on the aqueous solution, the initial concentration of the metal solution and the temperature, was studied. Read More

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Investigation of Chromosome 1 Aberrations in the Lymphocytes of Prostate Cancer and Benign Prostatic Hyperplasia Patients by Fluorescence in situ Hybridization.

Cancer Manag Res 2021 31;13:4291-4298. Epub 2021 May 31.

Department of Urology, Jagiellonian University Medical College, Krakow, Poland.

Purpose: Radiotherapy is one of the most common treatments for prostate cancer. Finding a useful predictor of the therapeutic outcome is crucial as it increases the efficacy of treatment planning. This study investigated the individual susceptibility to radiation based on chromosome 1 aberration frequency measured by the FISH (fluorescence in situ hybridization) method. Read More

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3,9-Disubstituted Bis[1]benzothieno[3,2-;2',3'-][1,4]thiazines with Low Oxidation Potentials and Enhanced Emission.

J Org Chem 2021 Jun 8. Epub 2021 Jun 8.

Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany.

Dibrominated bis[1]benzothieno[3,2-;2',3'-][1,4]thiazines (BBTT) are efficiently synthesized and applied in Suzuki and Buchwald-Hartwig cross-coupling reactions to give access to 3,9-disubstituted BBTT derivatives with extended π-conjugation and enhanced electronic properties. For instance, 3,9-di(hetero)aryl substituted BBTT derivatives surpass their parent congeners phenothiazines with lower oxidation potentials and pronounced yellow to orange-red fluorescence (Φ ≈ 30-45%). In addition, 3,9-bis(di(hetero)arylamino substituted BBTT possess very high lying HOMO energy ( = -4. Read More

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A single snapshot multiplex immunoassay platform utilizing dense test lines based on engineered beads.

Biosens Bioelectron 2021 May 31;190:113388. Epub 2021 May 31.

Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Cheongam-ro77, Nam-gu, Pohang-si, Gyeongsangbuk-do, 37673, South Korea. Electronic address:

Co-circulation of coronavirus disease 2019 (COVID-19) and dengue fever has been reported. Accurate and timely multiplex diagnosis is required to prevent future pandemics. Here, we developed an innovative microfluidic chip that enables a snapshot multiplex immunoassay for timely on-site response and offers unprecedented multiplexing capability with an operating procedure similar to that of lateral flow assays. Read More

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Concentrations, transport characteristics, and health risks of PM-bound trace elements over a national park in central India.

J Environ Manage 2021 Jun 4;293:112904. Epub 2021 Jun 4.

Center for Research on Environment and Sustainable Technologies, Indian Indstitute of Science Education and Research Bhopal, India; Earth and Environmental Sciences, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal, 462 066, India. Electronic address:

Fine particulate matter (PM) mass and its chemical constituents were measured over Van Vihar National Park (VVNP) in Bhopal, central India. Fine PM collected over two years onto Teflon filters using a Mini-Vol® sampler were analyzed for trace elements using an Energy Dispersive X-ray fluorescence (ED-XRF) spectrometer. The temporal behaviour, dry deposition fluxes and transport pathways of elements, in addition to their health risks were examined in this study. Read More

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Dynamic Coordination between a Triphenylamine-Functionalized Salicylaldehyde Schiff Base and a Copper(II) Ion.

Inorg Chem 2021 Jun 7. Epub 2021 Jun 7.

Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, P. R. China.

The coordination between a ligand and a metal is a spontaneous and uncontrollable process. In this Article, we successfully observe the formation of metal coordination in a triphenylamine-functionalized salicylaldehyde Schiff base with a copper(II) ion. The ligand first reacts with Cu in a stepwise process to afford the dynamic complex ([ligand]:[Cu] = 1:1), which further reacts with an extra copper(II) ion to afford with the following stepwise (or cumulative) stability constants: = 4. Read More

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Achieving Organic Smart Fluorophores by Controlling the Balance between Intermolecular Interactions and External Stimuli.

ACS Appl Mater Interfaces 2021 Jun 7. Epub 2021 Jun 7.

China Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P.R. China.

Organic smart fluorophores (OSFs) are highly desirable over the past decades because of their potential applications in advanced photonic devices. However, it is still difficult and challenging to obtain such materials with tunable photophysical properties and high emission efficiency based on robust construction strategies. Therefore, we proposed a simple and efficient strategy for constructing OSFs by balancing the competition between intermolecular interactions and external stimuli via molecular structure design. Read More

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Natural Kaolin-Based Ni Catalysts for CO Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis.

ACS Omega 2021 Jun 18;6(21):13779-13794. Epub 2021 May 18.

Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand.

Natural kaolin-based Ni catalysts have been developed for low-temperature CO methanation. The catalysts were prepared via a one-step co-impregnation of Ni and Ce onto a natural kaolin-derived metakaolin using a microwave-assisted hydrothermal method as an acid-/base-free synthesis method. The influences of microwave irradiation and Ce promotion on the catalytic enhancement including the CO conversion, CH selectivity, and CH yield were experimentally investigated by a catalytic test of as-prepared catalysts in a fixed-bed tubular reactor. Read More

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Determination of Chlorides in Ionic Liquids by Wavelength Dispersive X-ray Fluorescence Spectrometry.

ACS Omega 2021 Jun 17;6(21):13620-13625. Epub 2021 May 17.

Department of Chemistry, KU Leuven, Celestijnenlaan 200F, P. O. box 2404, B-3001 Leuven, Belgium.

The synthesis of ionic liquids (ILs) usually involves two steps: (i) quaternization of a precursor followed by (ii) a salt metathesis reaction to introduce the desired anion. A consequence of the second step is that most ILs still contain some amount of the initial anion, often chloride. In this work, wavelength dispersive X-ray fluorescence (WDXRF) spectrometry is presented for the direct measurement of chlorides in ILs. Read More

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LncRNA HAS2-AS1 Promotes Glioblastoma Proliferation by Sponging miR-137.

Front Oncol 2021 20;11:634893. Epub 2021 May 20.

Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China.

GBM (Glioblastoma multiform) is the most malignant tumor type of the central nervous system and has poor diagnostic and clinical outcomes. LncRNAs (Long non-coding RNAs) have been reported to participate in multiple biological and pathological processes, but their underlying mechanism remains poorly understood. Here, we aimed to explore the role of the lncRNA HAS2-AS1 (HAS2 antisense RNA 1) in GBM. Read More

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A hierarchical assembly strategy for near-infrared photothermal conversion: unconventional heterogeneous metalla[2]catenanes.

Chem Sci 2020 Sep 21;11(42):11509-11513. Epub 2020 Sep 21.

State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University 2005 Songhu road Shanghai 200438 P. R. China.

Herein, we report a hierarchical assembly strategy for constructing heterogeneous half-sandwich organometallic D-A (D = π-donor, A = π-acceptor) interlocked structures, and their application in near-infrared (NIR) photothermal conversion. Thienothiophene and diketopyrrolopyrrole groups were selected as the D and A units, leading to two homogeneous metalla[2]catenanes with D-D-D-D and A-A-A-A stacks, respectively. By the ordered secondary assembly of homogeneous metalla[2]catenanes, two unprecedented heterogeneous D-A metalla[2]catenanes comprising an unusual mixed D-A-D-D and unconventional D-A-A-A stacks were realized by the combination of multiple noncovalent interactions, as all demonstrated by a detailed X-ray crystallographic study. Read More

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September 2020

γ-Glutamyl transpeptidase-activatable near-infrared nanoassembly for tumor fluorescence imaging-guided photothermal therapy.

Theranostics 2021 13;11(14):7045-7056. Epub 2021 May 13.

School of Engineering, China Pharmaceutical University, Nanjing 211198, P. R. China.

Precise treatment of tumors is attracting increasing attention. Molecular probes simultaneously demonstrating the diagnostic signal and pharmacological effect in response to tumor microenvironment are highly desired. γ-glutamyl transpeptidase (GGT) is a biomarker with significantly up-regulated expression in the tumor area. Read More

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Demystifying autofluorescence with excitation-scanning hyperspectral imaging.

Proc SPIE Int Soc Opt Eng 2018 Jan-Feb;10497. Epub 2018 Feb 20.

Department of Chemical and Biomolecular Engineering, University of South Alabama.

Autofluorescence has historically been considered a nuisance in medical imaging. Many endogenous fluorophores, specifically, collagen, elastin, NADH, and FAD, are found throughout the human body. Diagnostically, these signals can be prohibitive since they can outcompete signals introduced for diagnostic purposes. Read More

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February 2018

Excitation-Scanning Hyperspectral Imaging as a Means to Discriminate Various Tissues Types.

Proc SPIE Int Soc Opt Eng 2017 Jan-Feb;10068. Epub 2017 Feb 16.

Chemical & Biomolecular Engineering, University of South Alabama.

Little is currently known about the fluorescence excitation spectra of disparate tissues and how these spectra change with pathological state. Current imaging diagnostic techniques have limited capacity to investigate fluorescence excitation spectral characteristics. This study utilized excitation-scanning hyperspectral imaging to perform a comprehensive assessment of fluorescence spectral signatures of various tissues. Read More

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February 2017

[Glioma Surgery and Surgical Supporting Technology].

Authors:
Kuniaki Saito

No Shinkei Geka 2021 May;49(3):536-548

Department of Neurosurgery, Kyorin University Faculty of Medicine.

Maximum safe resection is the principal goal of glioma surgery to improve patient prognosis, and various skills and techniques are available to achieve this. First, detailed preoperative image assessment of the tumor, arteries, veins, and white matter is helpful in developing the surgical plan. Second, surgical supporting technology, such as a navigation system, electrophysiological monitoring, awake craniotomy, and fluorescence-guided surgery, are vital for glioma surgery. Read More

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Cellular biogenesis of metal nanoparticles by water velvet (): different fates of the uptake Fe and Ni to transform into nanoparticles.

Artif Cells Nanomed Biotechnol 2021 Dec;49(1):471-482

School of Biology, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand.

Plants can produce cellular metal nanoparticles (NPs) from the uptake of metal ions, but the mechanism remains unclear. This work reported the new insight into different fates of iron (Fe) and nickel (Ni) ions to transform into the metal NPs in roots. After exposing to ferric nitrate, nickel nitrate, and a combination of both for 12 h, the energy dispersive X-ray fluorescence analysis indicated the efficient uptakes of both metal ions in the roots and their transports into the shoots. Read More

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December 2021

Long-term pretreatment with alendronate inhibits calvarial defect healing in an osteoporotic rat model.

J Bone Miner Metab 2021 Jun 6. Epub 2021 Jun 6.

Department of Orthopedics, Peking University Third Hospital, No. 49, Huayuan North Road, Haidian District, Beijing, 100191, China.

Introduction: This study aimed to observe the effects of long-term alendronate pretreatment on the healing of osteoporotic calvarial defects, and further investigate the effect of alendronate combined with once-weekly parathyroid hormone following 12 weeks of alendronate treatment in ovariectomized rats.

Materials And Methods: Thirty 3-month-old female rats were ovariectomized, and 24 rats received alendronate for 12 weeks. Then, a critical defect was created in the calvaria of all animals. Read More

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Novel Ba and Pb metal-organic frameworks based on a semi-rigid tetracarboxylic acid: syntheses, structures, topologies and luminescence properties.

Acta Crystallogr C Struct Chem 2021 Jun 26;77(Pt 6):291-298. Epub 2021 May 26.

School of Chemistry and Chemical Engineering, Hebei Normal University For Nationalities, Higher Education Park, Chengde 067000, People's Republic of China.

Multidentate carboxylate ligands have been widely used in the construction of metal-organic frameworks (MOFs) owing to the rich variety of their coordination modes, which can lead to crystalline products with interesting structures and properties. Two new main-group MOFs, namely, poly[[di-μ-aqua-diaqua(dimethylformamide)[μ-5,5'-methylenebis(2,4,6-trimethylbenzene-1,3-dicarboxylato)]dibarium(II)] trihydrate], {[Ba(CHO)(CHNO)(HO)]·3HO} or {[Ba(BTMIPA)(DMF)(HO)]·3HO} (1), and poly[[diaqua[μ-5,5'-methylenebis(2,4,6-trimethylbenzene-1,3-dicarboxylato)]dilead(II)] 2.5-hydrate], {[Pb(CHO)(HO)]·2. Read More

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