Bibliographies thématiques / Fluorescenza X

Littérature scientifique sur le sujet « Fluorescenza X »

Auteur : Grafiati
Publié le 10 mars 2023
Mis à jour le 11 mars 2023

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Articles de revues sur le sujet "Fluorescenza X"

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Li, Ping, Yanhui Song, Xufeng Niu, Kun Li et Yubo Fan. « Drug Delivery System with Multiple Rare Earth Ions Fluorescent-Labeling Drugs and Magnetic Nanoparticles ». Journal of Nanoscience and Nanotechnology 19, no 6 (1 juin 2019) : 3288–92. http://dx.doi.org/10.1166/jnn.2019.16578.

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The bifunctional drug delivery system combining magnetic nanoparticles and fluorophore possesses the characterization of magnetism and fluorescence. However, the accurate tracing of the drug release and diffusion pathway is affected by the separation of drug and fluorescent molecule. In this paper, we synthesized the fluorescent-labeling drug by covalently binding Aspirin with rare earth ions Terbium (Te) and Gadolinium (Gd), which was incorporated into chitosan microspheres with magnetic nanoparticles Fe3O4 to prepare magnetic and fluorescent drug delivery system. Investigated by Fourier transform infrared spectrometer, fluorescence spectrophotometer, X-ray diffraction, vibrating sample magnetometer, and scanning electron microscopy, the chitosan microspheres showed excellent fluorescent and magnetic properties. Compared with the single rare earth ion complex, the multiple rare earth ions complexes with Aspirin TbxGd1−x(Aspirin)3 · 2H2O (x 0.25, 0.5, 0.75) exhibited superior fluorescent intensity.
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Zhuo, Wei. « Design of X-Ray Fluorescence Spectrum Software Based on Linux ». Applied Mechanics and Materials 602-605 (août 2014) : 3601–3. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.3601.

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According to the research on analysis software of X fluorescent spectrum under the Linux system, a new algorithm of X fluorescence analyzer has been brought up: use the method of energy dispersive X fluorescence analysis, based on the software that can analyze the material composition under the control of ARM - Linux touch screen. This paper fixes on developing software of X fluorescence analyzer; realize the collection and analysis of multi-channel spectrum data, data storage, sample analysis, qualitative and quantitative analysis of the on-site samples, and the research and implementation of corresponding algorithm.
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Han, I., M. Şahin et L. Demir. « Angular variations of K and L X-ray fluorescence cross sections for some lanthanides ». Canadian Journal of Physics 86, no 2 (1 février 2008) : 361–67. http://dx.doi.org/10.1139/p07-128.

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Kα, Kβ, Lα, and Lβ X-ray fluorescence cross sections for lanthanides in the atomic range 62 ≤ Z ≤ 68 (Sm, Eu, Gd Tb, Dy, Ho, and Er) were simultaneously measured by 59.54 keV incident photon energy at five angles ranging from 120° to 160°. The measurements were performed using an Am-241 radioisotope as the photon source and a Si(Li) detector. The Lα X-ray fluorescence cross section (σLα) was found to decrease with increasing emission angle and showed an anisotropic distribution of Lα X-rays. Kα, Kβ, and Lβ X-ray fluorescence cross sections (σKα, σKβ, and σLβ) were observed to be angle-independent and showed an isotropic distribution of Kα, Kβ, and Lβ X-rays. The Kα and Kβ X-rays originate from filling of the K shell (J = 1/2) vacancies, Lβ X-rays from filling of the L1 and L2 (J = 1/2) subshell vacancies, and Lα X-rays from filling of the L3 subshell (J = 3/2) vacancy. The fluorescent X-rays originating from the vacancy states with J = 1/2 are isotropic and unpolarized, but fluorescent X-rays originating from the vacancy states with J > 1/2 are anisotropic and polarized. Thus, the atomic inner shells vacancy states with J > 1/2 are aligned whereas vacancy states with J = 1/2 are not aligned. Lα fluorescence X-rays have an anisotropic distribution, while Kα, Kβ, and Lβ fluorescence X-rays have isotropic distribution. Furthermore, the IKβ/IKα, ILα/IKα}, ILβ/IKα, and ILβ/ILα intensity ratios for the elements under investigation were determined. The experimental cross sections and intensity ratios for Kα, Kβ, Lα, and Lβ fluorescence X-rays were also determined, and these experimental values were compared with our calculated theoretical values.PACS Nos.: 32.30.Rj, 32.80.Cy
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Yamada, Shoya, Fuminori Ohsawa, Shuji Fujii, Ryosuke Shinozaki, Makoto Makishima, Hirotaka Naitou, Shuichi Enomoto, Akihiro Tai et Hiroki Kakuta. « Fluorescent retinoid X receptor ligands for fluorescence polarization assay ». Bioorganic & ; Medicinal Chemistry Letters 20, no 17 (septembre 2010) : 5143–46. http://dx.doi.org/10.1016/j.bmcl.2010.07.011.

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Vincze, L., K. Janssens et F. Adams. « Optics for X-ray Microfluorescence to Be Used at the European Synchrotron Radiation Facility ». Advances in X-ray Analysis 37 (1993) : 553–63. http://dx.doi.org/10.1154/s0376030800016104.

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Micro-SRXRF (Synchrotron Radiation induced X-ray Fluorescence) is ti microanalytical technique which, utilizes an intense, polarized X-ray micro beam originating from the storage ring to induce X-ray fluorescence in a microscopic volume of the sample under investigation. The emerging fluorescent and scattered radiation is normally detected by an energy-dispersive Si(Li) detector. The recorded fluorescent spectra provide qualitative and quantitative information on the examined material yielding minimum, detection limits in the ppm and in favourable cases in the sub-ppm range at current SRXRF-facilities. Possible applications of synchrotron X-ray microprobes are the mapping of chemical elements in biological tissues, investigation of element migration and partitioning in geological systems, the analysis of individual microscopic particles and a variety of topics in applied research.
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Heck, Susanne, Olga Ermakova, Hiromi Iwasaki, Koichi Akashi, Chiao-Wang Sun, Thomas M. Ryan, Tim Townes et Thomas Graf. « Distinguishable live erythroid and myeloid cells in β-globin ECFP x lysozyme EGFP mice ». Blood 101, no 3 (1 février 2003) : 903–6. http://dx.doi.org/10.1182/blood-2002-06-1861.

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Abstract We previously described a mouse line that contains green myelomonocytic cells due to the knock-in of enhanced green fluorescence protein (EGFP) into the lysozyme M gene.1 We have now created a transgenic line with fluorescent erythroid cells using a β-globin locus control region driving the enhanced cyan fluorescence protein (ECFP) gene. These mice exhibit cyan fluorescent cells specifically in the erythroid compartment and in megakaryocyte-erythroid progenitors. Crossing the animals with lysozyme EGFP mice yielded a line in which live erythroid and myeloid cells can readily be distinguished by fluorescence microscopy and by fluorescence-activated cell-sorter scanner. This cross allowed unambiguous identification of unstained mixed erythroid-myeloid colonies for the first time. The new mouse lines should become useful tools to dissect the branching between erythroid and myelomonocytic cells during in vitro differentiation of definitive multipotent progenitors.
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Che, Zhijiang, Jian Zhang, Baiyi Wu, Qiangqiang Hu, Wenxiang Mu, Yanru Yin et Zhitai Jia. « Investigation of Y2.1Er0.9(ScxGa1−x)5O12 Matrix Components on the Spectral Properties around 3.0 μm by Micro-Pulling-Down Method ». Crystals 9, no 3 (7 mars 2019) : 138. http://dx.doi.org/10.3390/cryst9030138.

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Single crystal fibers of 30% Er3+-doped compound of Y3(ScxGa1−x)5O12 have been grown by using the micro-pulling down (μ-PD) technique successfully. Our main purpose is to tune the fluorescence properties by adjusting the ratios of Sc3+ and Ga3+ ions inside the matrix crystals. The crystal structures of the series compounds were measured and analyzed through X-ray diffraction (XRD) measurements. The components and doping elements distributions were measured by the X-ray Fluorescence spectrometry and electron-probe microanalyzer. The absorption and mid-infrared fluorescence spectra, including the fluorescent lifetime of Er3+:4I13/2 and 4I11/2 levels were measured and compared systematically at room temperature. Spectral analysis indicated that the fluorescent lifetime of Er3+:4I13/2 tended to shorten and the emission spectra began to show a red shift when the proportion of YSG increased in the compound. Furthermore, the Raman spectra were measured to reveal the variations of lattice vibration and phonon energy.
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Hu, Sheng-Li, Guo-Dong Yin, Yu-Zhou Wang et An-Xin Wu. « Synthesis, X-ray structure, and binding properties of a new fluorescent molecular clip derived from diethoxycarbonyl glycoluril ». Canadian Journal of Chemistry 86, no 7 (1 juillet 2008) : 691–94. http://dx.doi.org/10.1139/v08-058.

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A new fluorescent molecule clip derived from diethoxycarbonyl glycoluril with two 2,5-diphenyl-furan sidewalls was designed and synthesized. Its structure and conformation was confirmed by single-crystal X-ray diffraction. Its binding properties, investigated by fluorescence spectroscopey, showed that it can selectively bind Fe3+ with fluorescence quenching.Key words: diethoxycarbonyl glycoluril, molecular clip, fluorescence, Fe(III).
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Khanra, Somnath, Sabyasachi Ta, Milan Ghosh, Sudeshna Chatterjee et Debasis Das. « Subtle structural variation in azine/imine derivatives controls Zn2+ sensitivity : ESIPT-CHEF combination for nano-molar detection of Zn2+ with DFT support ». RSC Advances 9, no 37 (2019) : 21302–10. http://dx.doi.org/10.1039/c9ra03652k.

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Gabey, A. M., W. R. Stanley, M. W. Gallagher et P. H. Kaye. « The fluorescence properties of aerosol larger than 0.8 μm in an urban and a PBA-dominated location ». Atmospheric Chemistry and Physics Discussions 11, no 1 (7 janvier 2011) : 531–66. http://dx.doi.org/10.5194/acpd-11-531-2011.

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Abstract. Dual-wavelength Ultraviolet light-induced fluorescence (UV-LIF) measurements were performed on ambient environmental aerosol in Manchester, UK (urban city centre, winter) and Borneo, Malaysia (remote, tropical), which are taken to represent environments with negligible and significant primary biological aerosol (PBA) influences, respectively. Single-particle fluorescence intensity and optical equivalent diameter were measured with a Wide Issue Bioaerosol Sensor, version 3 (WIBS3) in the diameter range 0.8 μm≤DP≤20 μm for 2–3 weeks and filters were analysed using energy dispersive X-ray (EDX) spectroscopy, which revealed mostly non-PBA dominated particle sizes larger than 1 μm in Manchester. The WIBS3 features three fluorescence channels: Fluorescence excited at 280 nm is recorded at 310–400 nm and 400–600 nm and fluorescence excited at 370 nm is detected at 400–600 nm. In Manchester the primary size mode of fluorescent and non-fluorescent material was at 1.2 μm. In Borneo non-fluorescent material peaked at 1.2 μm and fluorescent at 3–4 μm. The fluorescence intensity at 400–600 nm generally increased with DP at both sites, as did the 310–400 nm intensity in Borneo. In Manchester the 310–400 m fluorescence decreased at DP>4 μm, suggesting this channel offers additional discrimination between fluorescent particle types. Finally, the ratio of fluorescence intensity in two pairs of channels was investigated as a function of particle diameter and this varied significantly between the two environments, demonstrating that the fluorescent aerosol in each can in principle be distinguished using a combination of fluorescence and elastic scattering measurements.
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Thèses sur le sujet "Fluorescenza X"

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TISATO, Flavia. « Study on Modern and Contemporary works of Art through non invasive integrated physical techniques ». Doctoral thesis, Università degli studi di Ferrara, 2014. http://hdl.handle.net/11392/2388948.

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During my PhD I developed two parallel and complementary topics, concerning both works of art and materials. The first one, focused on non-invasive investigations on works of art (ancient and contemporary), was aimed to deepen conservative state, material composition, painting techniques and the early detection of any deterioration. This latter goal also guided the study of pictorial and restoration materials, mainly aimed at their characterization from the optical point of view. Diagnostic activities made use of different methods of investigation. Among image techniques, photography and macrophotography in diffuse, specular and raking light, ultraviolet fluorescent, image spectroscopy, wide band infrared reflectography, digital and differential K-edge radiography. To get as much information as possible, to be properly integrated with other data, punctual diagnostic techniques, such as reflectance spectrophotometry, colorimetry and X Ray fluorescence, were also used.
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Marchesini, Stefano. « X ray fluorescence holography ». Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10012.

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Dans de nombreux cas la structure atomique des solides ne peut etre resolue par les techniques traditionnelles de la cristallographie. Cela peut etre le cas, par exemple, pour les etudes locales d'impuretes diluees, les interfaces enterrees et plus generalement les systemes non periodiques. En 1996 une nouvelle methode structurale, l'holographie x a resolution atomique est apparue. Elle a pour origine la technique d'imagerie holographique, inventee par gabor il y a 50 ans. Dans ce travail, nous presentons d'abord le principe et le cadre theorique de l'holographie par fluorescence, fondes sur le concept de source / detecteur interne. Puis nous decrivons les developpements techniques que nous avons progressivement obtenus, afin de transposer cette methode des rayons x de laboratoire vers la source synchrotron esrf ; ceci sous le double point vue du montage experimental et de l'analyse des donnees. Des resultats intermediaires interessants sont l'imagerie des configurations des lignes de kossel et des ondes stationnaires, a partir desquelles des informations structurales - parametre de reseau, symetrie et orientation cristallines - peuvent etre deduites. Puis l'hologramme et la reconstruction atomique de monocristaux modeles tels que coo(111) sont presentes, avec - pour la premiere fois, une resolution isotrope de 0,5 a et une qualite d'image qui n'avait pas ete obtenue jusqu'a present. Enfin, la premiere application de l'holographie par fluorescence aux films epitaxiques est donnee. Des differences significatives entre des films d'alliages fept chimiquement ordonne et desordonne ont ete obtenus, ouvrant la voie a l'etude de l'ordre a courte distance directionnel dans de tels systemes, au-dela des possibilites de la spectroscopie xafs. De nouvelles perspectives sont offertes en conclusion, concernant l'holographie atomique resolue en temps, ainsi que - sur la base d'une etude preliminaire d'holographie nucleaire - le potentiel de cette technique pour le magnetisme local et la selectivite en site.
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ORSILLI, JACOPO. « AR-XRF Techniques for the Analysis of Cultural Heritage layered samples ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/403656.

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L’analisi scientifica è da un po’ di tempo entrata nel mondo dei beni culturali, non sono più solo gli archeologi e gli storici dell’arte a occuparsi dello studio dei reperti archeologici e storici, ma anche gli scienziati sono entrati a gamba tesa portando le loro conoscenze al servizio di questa vasta gamma di materiali. Lo studio di reperti botanici e zoologici, le competenze chimiche e mineralogiche, lo studio di fenomeni fisici, ha permesso di porre e rispondere a nuove domande, colmando così lacune sulla storia dell’umanità. Reti commerciali, migrazioni, tecniche produttive, molte sono state le scoperte avvenute grazie anche all’intervento scientifico, oltre a fornire strumenti utili al restauro e alla conservazione dei reperti. Nei miei tre anni di dottorato mi sono occupato dell’applicazione dell’analisi in Fluorescenza a Raggi X (XRF) per analizzare campioni metallici e ceramici. Questa tecnica ha il vantaggio di poter essere applicata in maniera non invasiva e non distruttiva su un reperto per ottenere informazioni sulla sua composizione elementare. In particolare, il nostro obiettivo è quello di ottenere informazioni sui diversi strati che compongono un campione. Spesso, infatti, i manufatti presentano una struttura stratificata causata dal passaggio degli anni o dalla natura stessa dell’oggetto, che presenza una serie di decorazioni superficiali. L’impiego di tecniche non invasive permetterebbe quindi di ottenere informazioni più dettagliate anche su campioni al momento inaccessibili, in quanto troppo fragili o troppo preziosi. Lo studio si è quindi avvalso di tecniche a scansione angolare, per cui il segnale di fluorescenza caratteristica dipende sia dalla posizione dell’analita all’interno del campione, sia dalla struttura e composizione dello stesso, sia dalla geometria di analisi. Per valutare l’applicabilità delle tecniche sono stati analizzati tre casi diversi: campioni metallici preparati ad hoc in laboratorio, un campione ceramico, e un campione di lustro. Per i primi due campioni è stata applicata l’XRF a Risoluzione Angolare (AR-XRF) per cui il campione è stato ruotato con uno step angolare inferiore a un grado, e misurato ad ogni step. Nel caso dei campioni metallici i profili misurati sono stati confrontati direttamente con i profili calcolati usando il metodo dei Parametri Fondamentali. Nel caso del campione ceramico invece, sono stati confrontati i rapporti dei profili, in quanto la geometria del campione era piuttosto complessa. Nello studio sui campioni metallici, composti da una doratura depositata su una lamina di rame, è stato possibile calcolare lo spessore dello strato superficiale. Nel caso del campione di Majolica sono invece state studiate le varie decorazioni, valutando così anche diversi limiti della tecnica, in particolar modo nel caso in cui la composizione della decorazione sia simile alla composizione dello strato sottostante, o nel caso in cui avvengano processi di diffusione a lunghe distanze. In casi in cui invece lo spessore della decorazione era limitato e ben separato dallo strato sottostante, è stato possibile ottenere informazioni sua sulla composizione della decorazione che sul suo spessore. Infine, lo studio delle ceramiche lustrate è stato effettuato presso la linea XRF del Sincrotrone di Elettra, impiegando tecniche di analisi in radenza. In questo caso stato possibile solo evidenziare come il nano-strato di nano-particelle di argento, caratteristico di questa tipologia di campioni, sia effettivamente distinguibile applicando queste tecniche, in quanto il profilo di fluorescenza di tale elemento è molto diverso dagli altri. Rimangono comunque dei problemi, legati soprattutto all’analisi dati e all’allineamento che vanno ancora risolti, rendendo necessari ulteriori studi a riguardo.
In the last decades scientific analysis has been deeply employed in the world of cultural heritage, thus, archaeologists and art historians are no more the sole front line workers of this field. Scientists, and science, have joined the team, giving new inputs and tools for the study of historical and archaeological samples, allowing to explore new paths and receive new answers, collecting information otherwise inaccessible on human history and culture. New discoveries have been made on the trade networks, migrations and on the technologies employed; besides, science also gave precious inputs on conservation and restoring procedures, allowing to better preserve fragile and sensitive artifacts. In my three years as a PhD student, I worked on the application of X-Ray Fluorescence (XRF) analysis to analyze ceramic and metal samples. XRF is a non-invasive technique that retrieves the elemental composition of a sample. In particular the aim of my PhD project is to obtain information on the layered structure of an unknown sample, distinguishing and characterizing the different layers. Indeed, artifacts usually concerning the field of Cultural Heritage present a layered structure; sometimes it is due to the presence of alteration layers, other times, instead, the objects are made of different layers from the principle, for example in the case of a glazed ceramic or of a painting. The possibility to get this information in a non-invasive way will give the possibility to analyze objects that are nowadays unattainable, because they cannot be sampled. My project has, thus, focused on the analysis of three kinds of samples employing angular dependent techniques (Angle Resolved-XRF, Grazing Emission-XRF}, Grazing Incidence-XRF}); indeed, the fluorescence signal of an analyte depends on its position inside the sample, on the sample composition and on the geometry of analysis. The chosen specimens allowed to verify the feasibility of this analytical method in an increasing complexity: a gilded laboratory-made sample, a ceramic Majolica sherd, and an Italian renaissance lustered fragment. The first two samples have been analyzed through AR-XRF where the measure is performed while tilting the sample, one spectrum is collected for each tilting angle. In the case of the gilded sample the measured profiles have been compared directly with the calculated profiles employing the Fundamental Parameters method. For the ceramic Majolica sample, instead, we studied the ratio of the profiles, as the sample surface is not flat. In the study of the metallic samples, made of gilded copper plate, we could infer the thickness of the top-layer. While in the case of the Majolica sample, we studied the different decorations, evaluating the limits of the technique, in particular in the case that the top-layer composition is similar to the underling layer, or in the case of a long-range diffusion. Instead, in the case of two well-separate layers we could retrieve information on both the composition and the thickness of the layer. Finally, the study of the lustered ceramic has been carried out at the XRF beamline of the Elettra Synchrotron of Trieste, employing grazing techniques. In this case we could only highlight and distinguish the presence of the silver nanoparticles in the luster nanolayer, which is the peculiar feature of this kind of artifacts. However, there are still many questions left, especially concerning the data analysis and the alignment of the sample, which requires more investigations.
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Sargenti, Azzurra <1986&gt. « Study of Magnesium Homeostasis and Intracellular Compartmentalization in Human Cells by Fluorescent Chemosensors and Synchrotron X-Ray Fluorescence ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7496/1/Sargenti_Azzurra_tesi.pdf.

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In this study, we investigated the analytical capabilities of DCHQ5, a new fluorescent chemosensor, belonging to the family of diaza-crown-hydroxyquinolines, for the quantitative assessment of total intracellular magnesium content, and its biological applications. We performed a comparative study of DCHQ5 and DCHQ1, the latter being the mother probe of the series, which showed preliminary encouraging results comparable to atomic absorption spectroscopy. We demonstrated that DCHQ5 is able to accurately quantify the total amount of Mg in a very “small” cellular population, by using a simple spectrofluorimetric assay. Furthermore, DCHQ5 demonstrated to be a versatile tool for different applications: its higher intracellular retentions allow to perform cytofluorimetric assays and two-photon confocal microscopy on whole and viable cells; its photochemical characteristic make it excitable in both UV and visible spectra, and the presence of different lifetimes allow to perform fluorescence life time imaging of intracellular Mg. DCHQ5 was also exploited for studying the involvement of magnesium in the commitment of human adipose-derived mesenchymal stem cells (hASCs) with a mixture of hyaluronic, butyric and retinoic acids (HBR). We found that in normal magnesium availability, hASCs precommitment is associated by an increase of total magnesium content during time and by a block in the G2/M phase of the cell cycle. Moreover, our results demonstrated that magnesium deprivation triggers multilineage enrichments of HBR-induced preconditioning of hASCs. The second part of this research was aimed at comparing single cells elemental analysis performed with synchrotron-based fluorescence and cell population analysis carry out by DCHQ5. We exploited innovative techniques of x-ray fluorescence microscopy by using a multimodal approach in order to achieve within the cells the spatial distribution of the concentration of magnesium and fundamental light elements for life. The combination of classical and innovative analytical techniques can shed new light in the comprehension of magnesium homeostasis.
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Sargenti, Azzurra <1986&gt. « Study of Magnesium Homeostasis and Intracellular Compartmentalization in Human Cells by Fluorescent Chemosensors and Synchrotron X-Ray Fluorescence ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7496/.

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In this study, we investigated the analytical capabilities of DCHQ5, a new fluorescent chemosensor, belonging to the family of diaza-crown-hydroxyquinolines, for the quantitative assessment of total intracellular magnesium content, and its biological applications. We performed a comparative study of DCHQ5 and DCHQ1, the latter being the mother probe of the series, which showed preliminary encouraging results comparable to atomic absorption spectroscopy. We demonstrated that DCHQ5 is able to accurately quantify the total amount of Mg in a very “small” cellular population, by using a simple spectrofluorimetric assay. Furthermore, DCHQ5 demonstrated to be a versatile tool for different applications: its higher intracellular retentions allow to perform cytofluorimetric assays and two-photon confocal microscopy on whole and viable cells; its photochemical characteristic make it excitable in both UV and visible spectra, and the presence of different lifetimes allow to perform fluorescence life time imaging of intracellular Mg. DCHQ5 was also exploited for studying the involvement of magnesium in the commitment of human adipose-derived mesenchymal stem cells (hASCs) with a mixture of hyaluronic, butyric and retinoic acids (HBR). We found that in normal magnesium availability, hASCs precommitment is associated by an increase of total magnesium content during time and by a block in the G2/M phase of the cell cycle. Moreover, our results demonstrated that magnesium deprivation triggers multilineage enrichments of HBR-induced preconditioning of hASCs. The second part of this research was aimed at comparing single cells elemental analysis performed with synchrotron-based fluorescence and cell population analysis carry out by DCHQ5. We exploited innovative techniques of x-ray fluorescence microscopy by using a multimodal approach in order to achieve within the cells the spatial distribution of the concentration of magnesium and fundamental light elements for life. The combination of classical and innovative analytical techniques can shed new light in the comprehension of magnesium homeostasis.
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Heiden, Thomas. « Clinical fluorescence cytometry : improvements to preparation methods and instrumentation / ». Stockholm, 1999. http://diss.kib.ki.se/1999/91-628-3648-X/.

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An, Siwen. « X-ray Fluorescence Spectrometry for Environmental Applications ». Licentiate thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-39979.

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Heavy metal contamination in environmental applications is particularly important because of its potential impact on associated ecosystems and human health. At present, monitoring of heavy metals is usually done by taking and preparing samples for off-line laboratory measurements. X-ray fluorescence (XRF) analysis is a powerful and widely used tool for determining the elemental composition and concentration of chemical species in materials. This project is a feasibility study for the possibility of on-line XRF systems for continuousand direct analysis of industrial processes and environmental emissions. The feasibility of such measurements depends on the accuracy with which the concentration can be measured within a given response time. Therefore, this project is focused on investigating possible background suppression of the XRF spectrum. First, an XRF setup has been built, and its capability has been compared to a commercial scanning electron microscope with energy dispersive spectroscopy (SEM-EDS). The qualitative analysis and semi-quantitative analysis of heavy metal contamination in fly ash was performed and compared. Due to minimal sample preparation, the developed XRF system is suitable for in-situ measurements. A series of experiments was performed to optimize the signal-to-noise ratio of the spectra achieved from chromium contaminated liquid samples. The most significant factor turned out to be the primary X-ray source filter. Numerical simulation models have been developed in the Monte Carlo N-particle radiation transport code (MCNP), to calculate the X-ray fluorescence intensities and the detection limit for chromium in liquid samples. The experimental results agree with the results predicted by the simulation model, hence the model is used for optimization of the XRF system. Further, XRF mapping of chemical element distributions on a microscopic level has been obtained by using both X-ray scanning microscopy and full-field projection microscopy. The resultingdata from these microscopy measurements can guide further comprehensive environmental and industrial monitoring missions by providing additional spatial distribution information. In conclusion, the first research contribution presented in this thesis is the demonstration of the possibility to perform in-situ XRF measurements of chromium contamination in leachate with a limit of detection below the legal environmental limits. The second is the demonstration of XRF mapping on amicroscopy level, where a polycapillary X-ray optics setup achieves a similar intensity as a geometrically corresponding pinhole optics setup.

Vid tidpunkten för framläggningen av avhandlingen var följande delarbeten opublicerade: delarbete 2 (inskickat), delarbete 3 (accepterat), delarbete 4 (accepterat).

At the time of the defence the following papers were unpublished: paper 2 (submitted), paper 3 (accepted), paper 4 (accepted).

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Ida, Hiroyuki. « X-ray fluorescence analysis with portable instruments ». 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144877.

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Liu, Ying. « Low Power Total Reflection X-Ray Fluorescence Spectrometry ». 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/192191.

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Abbott, Paul H. « Heuristically guided interpretation of X-ray fluorescence spectra ». Thesis, University of Wolverhampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309784.

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Livres sur le sujet "Fluorescenza X"

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X-ray fluorescence spectrometry. New York : J. Wiley, 1988.

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Jenkins, Ron. X-ray fluorescence spectrometry. 2e éd. New York : Wiley, 1999.

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Energy dispersive x-ray fluorescence analysis. Warszawa : PWN, 1989.

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A, Janssens Koen H., Adams F. 1938- et Rindby Anders, dir. Microscopic x-ray fluorescence analysis. Chichester : Wiley, 2000.

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Jenkins, Ron. X-Ray fluorescence spectroscopy. New York : Wiley, 1988.

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Total reflection X-ray fluorescence analysis. New York : Wiley, 1997.

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Klockenkämper, R. Total-reflection X-ray fluorescence analysis. New York : Wiley, 1997.

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E, Havránek, et Dejmková E, dir. Radionuclide x-ray fluorescence analysis with environmental applications. Amsterdam : Elsevier, 1990.

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X-ray fluorescence spectrometry (XRF) in geoarchaeology. New York : Springer, 2011.

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International, Strategic Directions, dir. X-ray fluorescence and micro-EDX. Los Angeles, Calif. (6242 Westchester Parkway, Suite 100, Los Angeles, Calif. 90045) : Strategic Directions International, 1988.

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Chapitres de livres sur le sujet "Fluorescenza X"

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Rivers, M. L., S. R. Sutton et K. W. Jones. « X-Ray Fluorescence Microscopy ». Dans X-Ray Microscopy III, 212–16. Berlin, Heidelberg : Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-46887-5_49.

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Nakai, Izumi. « X-ray Fluorescence Analysis ». Dans Encyclopedia of Earth Sciences Series, 1–5. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_321-1.

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Nakai, Izumi. « X-Ray Fluorescence Analysis ». Dans Encyclopedia of Earth Sciences Series, 1511–15. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_321.

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Janssens, K. « X-Ray Fluorescence Analysis ». Dans Handbook of Spectroscopy, 363–420. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602305.ch11.

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Janssens, Koen. « X-Ray Fluorescence Analysis ». Dans Handbook of Spectroscopy, 449–506. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527654703.ch14.

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Wobrauschek, P., P. Kregsamer et M. Mantler. « X-ray fluorescence analysis ». Dans Instrumental Multi-Element Chemical Analysis, 302–45. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4952-5_8.

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Jenkins, Ron. « X-Ray Fluorescence Analysis ». Dans X-ray Characterization of Materials, 171–209. Weinheim, Germany : Wiley-VCH Verlag GmbH, 2007. http://dx.doi.org/10.1002/9783527613748.ch3.

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Jones, Angela A. « X-ray Fluorescence Spectrometry ». Dans Agronomy Monographs, 85–121. Madison, WI, USA : American Society of Agronomy, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/agronmonogr9.2.2ed.c5.

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Liangquan, Ge. « Chapter 7. Geochemical Prospecting ». Dans Portable X-ray Fluorescence Spectrometry, 141–73. Cambridge : Royal Society of Chemistry, 2008. http://dx.doi.org/10.1039/9781847558640-00141.

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Williams-Thorpe, Olwen. « Chapter 8. The Application of Portable X-Ray Fluorescence Analysis to Archaeological Lithic Provenancing ». Dans Portable X-ray Fluorescence Spectrometry, 174–205. Cambridge : Royal Society of Chemistry, 2008. http://dx.doi.org/10.1039/9781847558640-00174.

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Actes de conférences sur le sujet "Fluorescenza X"

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Shanmugam, Sivabalan, Dornadula Koteeswaran, Kulandaivel Muthuvelu, Chilakapati Muralikrishna, Ganesan Bharanidharan, Prakasarao Aruna et Singaravelu Ganesan. « Fluorescence anisotropy characterization of oral tissues ». Dans Optical Biopsy X. SPIE, 2012. http://dx.doi.org/10.1117/12.909010.

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Monroe, D. M., G. B. Sherrill et H. R. Roberts. « A SIMPLE AND CONVENIENT FLUORESCENT ASSAY FOR MONITORING ACTIVATION OF COAGULATION FACTORS IX, X, AND PROTHROMBIN USING p-AMINO-BENZAMIDINE ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643563.

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Blood coagulation consists of a series of protein-protein-cofactor interactions that involve zymogen coagulation factors being activated to trypsin-like serine proteases, ultimately leading to conversion of prothrombin to thrombin. As described by Evans et al. ((1982) J. Biol. Chea. 257, 3014), the fluorescent compound p-aminobenzamidine (pAB) increases its quantum yield when bound to the active site of thrombin (but not when pAB is reacted with coagulation zymogens). We have devised a simple procedure to monitor activation of purified coagulation factors IX, X, and prothrombin using pAB. Human factor X with 150 μM pAB was activated with purified factor X activating protein from Russell’s Viper venom (RVVX). Fluorescence emission was monitored at 376nm with excitation at 336nm. Portions were removed and activation was measured by clotting assay, by assay using tosyl-Gly-Pro-Arg-p-nitroanilide (tosGlyProArgNA), and by polyacrylamide gel electrophoresis; all of which indicated that factor X activation followed a time course identical to the time course described by the pAB fluorescence increase. Factor IX was activated by factor XIa in the presence of pAB; portions were analyzed for clotting activity. Prothrombin was activated to (meizo)thrombin by Ecarin and activity was measured using tosGly-ProArgNA. In both cases the increase in pAB fluorescence was coincident with the time course described by activity assay. The pAB fluorescence assay has several advantages including: 1) activation can be easily and continuously monitored, 2) the extent of modification can be determined by inspection of the progress curve, and 3) the procedure can be used with a wide range of zymogen concentrations. Additionally, pAB can be used to follow activation of modified (pro)enzymes. For instance, activation of bovine des(γcarboxyglutamic acid)factor X by RVVX was found to be 100-fold slower than activation of unmodified bovine factor X. Our results suggest that following p-aminobenzamidine fluorescence is a useful and convenient procedure for monitoring activation of blood coagulation factors IX, X, and prothrombin.
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Gole, James L. « Preparation, characterization, and oxidation of small metal clusters ». Dans International Laser Science Conference. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.fn1.

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Using primarily high flux oven-based metal source configurations small alkali (Li x , Na x , K x ), coinage (Cu x ,Ag x ), and group IVA (Si x ,Ge x ) metal clusters are being generated in supersonic expansions and agglomerating flows. Both the clusters and their oxidation to form the metal cluster oxides, M n O(n > 2), are being characterized using a combination of single and multiphoton laser fluorescent techniques, chemiluminescence, and mass spectrometry. Photodissociation studies on sodium trimer using laser-induced one- and two-photon atom fluorescence spectroscopy are now being extended to lithium trimer generating a bound-free mirror image spectroscopy which strongly complements the information obtained from bound-bound two-photon spectroscopy. Recent results obtained with an intense copper trimer source demonstrate an ability to (1) study fluorescence from strongly dissociative levels and (2) observe substantial temperature-dependent dynamic changes in spectral features associated with the fluxional nature of copper trimer. Using agglomerated cluster flows and taking advantage of previous experience in the study of chemiluminescent processes across a wide pressure range, we are probing the chemiluminescent emission resulting from the oxidation of small copper (Cu x + O3), silver (Ag x + O3), silicon (Si x + NO2, N2O,O3), and germanium (Ge x + O3, N2O) clusters. From these studies we have obtained the first quantal information on the energy levels and optical signatures of several metal cluster oxides and observed the manifestation of a unique dynamics associated with metal cluster oxidation processes.
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Jacobsen, C., S. Lindaas, S. Williams et X. Zhang. « Scanning luminescence x-ray microscopy : imaging fluorescence dyes at suboptical resolution ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mp3.

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Scanning luminescence x-ray microscopy is based on the use of the very small focussed probe of a scanning x-ray microscope to stimulate visible light emission from dyes usually used in conventional fluorescence microscopy. Using an undulator x-ray source and a Fresnel zone plate to produce a focussed x-ray probe, we have obtained 50–75 nm resolution images of P31 phosphor grains, and we have imaged luminescence from polystyrene spheres loaded with 50–100 μmol/g of fluorescent dye. Further development of this technique should make possible the imaging of dye-tagged sites of biochemical activity at 20–60 nm resolution in wet, unsectioned, and perhaps even initially living cells. A possible extension of the technique for 3D imaging at the transverse resolution of the x-ray microscope is described, where visible light collection optics might be used to obtain <500 nm axial resolution.
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Manoharan, Yuvaraj, Udayakumar Kanniappan, JayanthKumar Vadivel, Sripriya Suresh, Dornadula Koteeswaran, Kulandaivel Muthuvelu, Chidambaranathan Pravada et al. « Time-resolved fluorescence spectroscopic characteristics of normal and cancerous blood ». Dans Optical Biopsy X. SPIE, 2012. http://dx.doi.org/10.1117/12.908822.

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Aruna, Prakasarao, Sivabalan Shanmugam, K. Muthuvelu, Dornadula Koteeswaran, S. Srinivasan, P. Venkatesan et Singaravelu Ganesan. « Fluorescence emission and excitation spectroscopic characterization of blood plasma protein ». Dans Optical Biopsy X. SPIE, 2012. http://dx.doi.org/10.1117/12.908978.

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Zhu, Xiaotong, Sudheesh K. Rajput, Manoj Kumar, Xiangyu Quan, Yasuhiro Awatsuji et Osamu Matoba. « Quantitative evaluation of TIE-based fluorescence imaging ». Dans Optical Design and Testing X, sous la direction de Rengmao Wu, Osamu Matoba, Yongtian Wang et Tina E. Kidger. SPIE, 2020. http://dx.doi.org/10.1117/12.2573913.

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Kabachnik, Nicolai M. « Angular correlations in Auger and fluorescence cascades ». Dans X-RAY AND INNER-SHELL PROCESSES. ASCE, 1997. http://dx.doi.org/10.1063/1.52269.

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Jones, Lawrence S., Chiaki Crews, Matthew Soman, James Ivory et Andrew D. Holland. « Evaluation of sensors for the detection of energy resolved very soft x-ray fluorescence ». Dans X-Ray, Optical, and Infrared Detectors for Astronomy X, sous la direction de Andrew D. Holland et James Beletic. SPIE, 2022. http://dx.doi.org/10.1117/12.2629344.

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DasGupta, Kamal. « Resonance Fluorescence X-Ray Microscopy ». Dans OE LASE'87 and EO Imaging Symp (January 1987, Los Angeles), sous la direction de E. R. Menzel. SPIE, 1987. http://dx.doi.org/10.1117/12.966931.

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Rapports d'organisations sur le sujet "Fluorescenza X"

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Grudberg, Peter Matthew. HIgh Rate X-ray Fluorescence Detector. Office of Scientific and Technical Information (OSTI), avril 2013. http://dx.doi.org/10.2172/1079831.

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Shear, Trevor A. Review of X-ray Tomography and X-ray Fluorescence Spectroscopy. Office of Scientific and Technical Information (OSTI), mars 2017. http://dx.doi.org/10.2172/1351176.

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Worley, Christopher Gordon. Micro-X-ray Fluorescence (MXRF) Direct Solids. Office of Scientific and Technical Information (OSTI), mars 2015. http://dx.doi.org/10.2172/1172204.

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Ice, G. E., J. S. Chung et M. Nagedolfeizi. X-ray fluorescence microtomography of SiC shells. Office of Scientific and Technical Information (OSTI), avril 1997. http://dx.doi.org/10.2172/603700.

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Smith, Kevin E. High Resolution Soft X-Ray Fluorescence Spectrometer. Fort Belvoir, VA : Defense Technical Information Center, mars 1997. http://dx.doi.org/10.21236/ada324710.

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Martell, C. J., et J. M. Hansel. Rapid determination of uranium by x-ray fluorescence. Office of Scientific and Technical Information (OSTI), mai 1987. http://dx.doi.org/10.2172/6421927.

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Martell, C. J., et J. M. Hansel. Determining zirconium in uranium by x-ray fluorescence. Office of Scientific and Technical Information (OSTI), décembre 1987. http://dx.doi.org/10.2172/5738785.

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Dr. Khalid Chouffani El Fassi. Hybrid-K-edge/X-ray Fluorescense Densitometry with Laser-Compton Scattered X-rays. Office of Scientific and Technical Information (OSTI), août 2010. http://dx.doi.org/10.2172/988363.

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Carlisle, J. A., L. J. Terminello, E. A. Hudson, E. L. Shirley, J. J. Jia, T. A. Callcott, F. J. Himpsel, D. L. Ederer et R. C. C. Perera. Resonant soft x-ray fluorescence studies of novel materials. Office of Scientific and Technical Information (OSTI), février 1995. http://dx.doi.org/10.2172/81067.

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Gilfrich, John V., et W. T. Elam. X-Ray Fluorescence Analysis at the Naval Research Laboratory. Fort Belvoir, VA : Defense Technical Information Center, mars 1998. http://dx.doi.org/10.21236/ada340458.

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