A5076694967- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Bone Tissue Engineering Materials
- Mineralogy and Gemology Studies
- Calcium Carbonate Crystallization and Inhibition
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Electron and X-Ray Spectroscopy Techniques
- Crystallography and Radiation Phenomena
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Building materials and conservation
- Diamond and Carbon-based Materials Research
- Cultural Heritage Materials Analysis
- Phase-change materials and chalcogenides
- Advanced Electron Microscopy Techniques and Applications
- X-ray Diffraction in Crystallography
- Heavy metals in environment
- Air Quality and Health Impacts
- Plant Micronutrient Interactions and Effects
- Astro and Planetary Science
- Bone health and osteoporosis research
- Radioactivity and Radon Measurements
- Advanced X-ray and CT Imaging
- Advanced Biosensing Techniques and Applications
Elettra-Sincrotrone Trieste S.C.p.A.
2015-2025
AREA Science Park
2007-2013
European Synchrotron Radiation Facility
2003-2009
Technical University of Munich
2007-2008
Technische Universität Berlin
2008
University of Göttingen
2007
Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux
2003-2005
École Normale Supérieure - PSL
2004
Centre National de la Recherche Scientifique
2004
Institut National Polytechnique de Toulouse
2004
The actin cytoskeleton is essential for osteoclasts main function, bone resorption. Two different organizations of have been described in osteoclasts, the podosomes belt corresponding to numerous F-actin columns arranged at cell periphery, and sealing zone defined as a unique large band actin. To compare role these two organizations, we imaged on various substrata: glass, dentin, apatite. Using primary expressing GFP-actin, found that podosome belts zones, both very dynamic structures, were...
The mineral/organic ratio, the crystal dimensions, stoichiometry and surface properties of biological apatites in various mineralized tissues are controlled adapted to reach specific properties. We proposed a model structured hydrated layer, located at apatite nanocrystals, which comprises ionic non-apatitic environments responsible for nanocrystalline reactivity evolution (maturation, ion mobility adsorption properties). Understanding this adaptative ability is useful design treatments bone...
Summary Iron speciation in soils is still poorly understood. We have investigated inorganic and organic standard substances, diluted mixtures of common Fe minerals (pyrite, ferrihydrite, goethite), a forested watershed which constitute toposequence with hydrological gradient (Dystric Cambisol, Dystric Planosol, Rheic Histosol), microsites dissected soil aggregate by X‐ray Absorption Near Edge Spectroscopy (XANES) at the iron K ‐edge (7112 eV) to identify different Fe(II) Fe(III) components....
Mature developed seeds are physiologically and biochemically committed to store nutrients, principally as starch, protein, oils, minerals. The composition distribution of elements inside the aleurone cell layer reflect their biogenesis, structural characteristics, physiological functions. It is therefore primary importance understand mechanisms underlying metal ion accumulation, distribution, storage, bioavailability in subcellular organelles for seed fortification purposes. Synchrotron...
Evidence of prehistoric dentistry has been limited to a few cases, the most ancient dating back Neolithic. Here we report 6500-year-old human mandible from Slovenia whose left canine crown bears traces filling with beeswax. The use different analytical techniques, including synchrotron radiation computed micro-tomography (micro-CT), Accelerator Mass Spectrometry (AMS) radiocarbon dating, Infrared (IR) Spectroscopy and Scanning Electron Microscopy (SEM), shown that exposed area dentine...
Biological systems are unique matter with very complex morphology and highly heterogeneous chemical composition dominated by light elements. Discriminating qualitatively at the sub-micrometer level lateral distribution of constituent elements, correlating it to sub-cellular biological structure, continues be a challenge. The low-energy X-ray fluorescence microspectroscopy, recently implemented in TwinMic scanning transmission mode, has opened up new opportunities for mapping complemented...
Ensuring reliable elemental analysis in food, cosmetic and pharmaceutical research is a prerequisite to human safety. Here we report on the use of total reflection X-ray fluorescence spectrometry, its state-of art challenges those fields.
Nanocrystalline apatites exhibit a very fragile structured hydrated surface layer which is only observed in aqueous media. This contains mobile ionic species can be easily exchanged with ions from the surrounding fluids. Although precise structure of this still unknown, it presents specific spectroscopic characteristics. The depends on constitutive mineral ions: ion exchanges HPO4 2- by CO3 or Ca2+ Mg2+ result de-structuration and modifies its However, original retrieved reverse exchange...
Some of the largest uranium deposits in Mexico are located Chihuahua. The most important is Sierra Peña Blanca, northwest capital, which was explored and partially exploited 1980s. After closure activities, mining projects were left exposed to weathering. To characterize drift minerals towards neighboring Laguna del Cuervo, sediment samples collected main streams drainage pattern deposits. mineral fragments from fine sand portion extracted using fluorescence at 365 nm light. These...
Some of the largest Mexican uranium (U) deposits are located in Chihuahua. The most important is Sierra Peña Blanca, northwest capital, which was explored and partially exploited 1980s. After closure activities, mining projects were left exposed to weathering. To characterize spread U minerals towards neighboring Laguna del Cuervo, sediment samples collected main streams drainage pattern deposits. mineral fragments from fine sand portion extracted using fluorescence light at 365 nm....
Nickel (Ni) is a transition metal widespread in the environment, and derives from both natural sources industrial activities. In turn, environmental nickel pollution may be linked to these natural...
Bulk element concentrations of whole grain and spatial distributions at the tissue level were investigated in wheat (Triticum aestivum) grown Zn-enriched soil. Inductively coupled plasma mass spectrometry inductively optical emission used for bulk analysis, whereas micro-proton-induced X-ray was to resolve two-dimensional localization elements. Soil Zn application did not significantly affect yield, but increase Ca, Fe concentrations, decrease Na, P Mo concentrations; Mg, S, K, Mn, Cu, Cd Pb...
This paper reports a simplified and compact mechanical scheme designed for providing alternatively high flux or spectral resolution from monochromator the 2 - 14 keV X-ray range in stationary spot at sample. The example case treats bending magnet source Elettra storage ring. properties of continuously tunable monochromatic beam are adapted variety experimental techniques, which include also need to operate sample total reflection regime, i.e. angles grazing incidence smaller than critical...
The anal. of wet nanocryst. apatites by spectroscopic techniques (FTIR, solid state NMR) reveals fine, transient, structural details testifying for the existence a structured hydrated layer on surface nanocrystals probably related although not identical, to structure octacalcium phosphate. On drying this loses its very fragile and gives disordered assembly ions corresponding non-apatitic environments. with mobile ionic entities due an enhanced reactivity, specific interesting properties,...