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3. Implementation of the Infection Risk Scan (IRIS) in nine hospitals in the Belgian-Dutch border region (i-4-1-Health project)

Author

Verelst, M., Willemsen, I., Weterings, V., Waegemaeker, P. De, Leroux-Roels, I., Nieuwkoop, E., Saegeman, V., Alphen, L. van, Kleef-van Koeveringe, S. van, Kluytmans-van den Bergh, M., Gyssens, I.C.J., Kluytmans, J., Schuermans, A., Verelst, M., Willemsen, I., Weterings, V., Waegemaeker, P. De, Leroux-Roels, I., Nieuwkoop, E., Saegeman, V., Alphen, L. van, Kleef-van Koeveringe, S. van, Kluytmans-van den Bergh, M., Gyssens, I.C.J., Kluytmans, J., and Schuermans, A.

Abstract

Item does not contain fulltext, BACKGROUND: A tool, the Infection Risk Scan has been developed to measure the quality of infection control and antimicrobial use. This tool measures various patient-, ward- and care-related variables in a standardized way. We describe the implementation of this tool in nine hospitals in the Dutch/Belgian border area and the obtained results. METHODS: The IRIS consists of a set of objective and reproducible measurements: patient comorbidities, (appropriate) use of indwelling medical devices, (appropriate) use of antimicrobial therapy, rectal carriage of Extended-spectrum beta-lactamase producing Enterobacterales and their clonal relatedness, environmental contamination, hand hygiene performance, personal hygiene of health care workers and presence of infection prevention preconditions. The Infection Risk Scan was implemented by an expert team. In each setting, local infection control practitioners were trained to achieve a standardized implementation of the tool and an unambiguous assessment of data. RESULTS: The IRIS was implemented in 34 wards in six Dutch and three Belgian hospitals. The tool provided ward specific results and revealed differences between wards and countries. There were significant differences in the prevalence of ESBL-E carriage between countries (Belgium: 15% versus The Netherlands: 9.6%), environmental contamination (median adenosine triphosphate (ATP) level Belgium: 431 versus median ATP level The Netherlands: 793) and calculated hand hygiene actions based on alcohol based handrub consumption (Belgium: 12.5/day versus The Netherlands: 6.3/day) were found. CONCLUSION: The Infection risk Scan was successfully implemented in multiple hospitals in a large cross-border project and provided data that made the quality of infection control and antimicrobial use more transparent. The observed differences provide potential targets for improvement of the quality of care.

Published
2022

14. Synthesis of pyrroloquinolinequinone analogs. Molecular structure and Mossbauer and magnetic properties of their iron complexes

Author

Tommasi, L., Shechter-Barloy, L., Varech, D., Battioni, J.-P., Donnadieu, B., Verelst, M., Bousseksou, A., Mansuy, D., and Tuchagues, J.P.

Subjects
Complex compounds -- Spectra, Quinone -- Research, Molecular structure -- Analysis, Chemistry
Abstract

A study of Mossbauer spectrum and molecular structure of iron complexes of pyrroloquinolinequinone (PPQ) analogs, synthesized by cycloaddition methods, reveals that stoichiometry and pH of the reactions influence the nuclearity and structure of these complexes. Chelation of oxidized PPQ with iron occurs via the quinonic site, while that of reduced PPQ proceeds through the tridentate state. Fe(II) is present in a distorted octahedral geometry.

Published
1995

22. Gadolinium luminescent materials obtained by spray pyrolysis, co-precipitation, and non-hydrolytic sol-gel route: Structure and optical properties

Author

Matos, M. G., Freiria, G. S., Oliveira, L. R., Faria, E. H., Paulo Sergio Calefi, Ciuffi, K. J., Rocha, L. A., Nassar, E. J., Verelst, M., Osseni, S. A., Lechevallier, S., Universidade do Minho, Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
[PHYS]Physics [physics]
Abstract

cited By 0; International audience; Improving luminescent materials has been the focus of researchers working in the areas of solid-state lasers, scintillators for medical imaging, and phosphors, among others. Lanthanide materials have wide application in optical fibers, amplifiers, and display devices: the inner shell electronic transitions between the 4f-4f energy levels of the lanthanide ions (Ln3+) provide them with excellent luminescent properties. We prepared the inorganic matrixes GdAlO3, Gd2O3, GdCaAl3O7, GdVO4, GdNbO4, and Gd2O2S doped with europium ions (Eu3+) in three different ways: (1) non-hydrolytic sol-gel route, by reacting the precursor metal chlorides in ethanol; (2) spray pyrolysis, using aqueous solution; and (3) co-precipitation synthesis, by reacting the precursor metal nitrates with urea in water, followed by various heat treatments. We characterized the resulting powders by thermal analyses, X-ray diffraction (XRD) analysis, scanning electron microscopy, and Eu3+ photoluminescence. The thermogravimetric curves showed mass loss, attributed to water molecules weakly bound to the oxide surface, solvent molecules, pyrolysis of organic matter remaining from the synthesis, and structural arrangement. The differential thermogravimetric curves evidenced exothermic peaks at different temperatures, associated with the structural rearrangement of the matrixes. The samples were thermally treated; the XRD patterns presented peaks ascribed to the crystalline phases of GdAlO3, GdCaAl3O7, Gd2O3, Gd2O2S, GdVO4, and GdNbO4, depending on the matrix. These results confirmed that the methodologies used to synthesize the materials were efficient. The morphological study revealed particles with different sizes and shapes: spray pyrolysis, co-precipitation synthesis, and the non-hydrolytic sol-gel methodology furnished particles measuring around 500 nm, spherical particles of around 100 nm, and irregular particles with less than 100 nm, respectively. For all the matrixes, the excitation spectra of Eu3+ displayed a broad band at shorter wavelength, assigned to the charge transfer between the ligand and the metal (O2-→ Eu3-or S2-→ Eu3-) and to the f-f transitions of the Eu3-excited state. Some spectra presented a band relative to the excited state of the Gd3+ ion, indicating Gd3+ → Eu3-energy transfer. The emission spectra of Eu3+, excited at different wavelengths, exhibited narrow lines between 500 and 750 nm, relative to the typical transition from the excited level to manifold level (5D0 → 7F2, with J = 0, 1, 2, 3, and 4). The more intense band of the matrixes corresponded to the hypersensitive transition 5D0 → 7F2, with dipole-electric character, detected with maximum at approximately 615 nm. The synthetic processes used here furnished gadolinium matrixes with excellent luminescent red emission; in some matrixes, Gd3+ efficiently transferred energy to Eu3+. Therefore, these materials have promising technological applications in luminescent devices.

Published
2014

23. Practical implementation, characterization and applications of a multi-colour time-gated luminescence microscope

Author

Zhang, L, Zheng, X, Deng, W ; https://orcid.org/0000-0002-9413-0978, Lu, Y, Lechevallier, S, Ye, Z, Goldys, EM ; https://orcid.org/0000-0003-2470-7118, Dawes, JM, Piper, JA, Yuan, J, Verelst, M, Jin, D, Zhang, L, Zheng, X, Deng, W ; https://orcid.org/0000-0002-9413-0978, Lu, Y, Lechevallier, S, Ye, Z, Goldys, EM ; https://orcid.org/0000-0003-2470-7118, Dawes, JM, Piper, JA, Yuan, J, Verelst, M, and Jin, D

Abstract

Time-gated luminescence microscopy using long-lifetime molecular probes can effectively eliminate autofluorescence to enable high contrast imaging. Here we investigate a new strategy of time-gated imaging for simultaneous visualisation of multiple species of microorganisms stained with long-lived complexes under low-background conditions. This is realized by imaging two pathogenic organisms (Giardia lamblia stained with a red europium probe and Cryptosporidium parvum with a green terbium probe) at UV wavelengths (320-400 nm) through synchronization of a flash lamp with high repetition rate (1 kHz) to a robust time-gating detection unit. This approach provides four times enhancement in signal-to-background ratio over non-time-gated imaging, while the average signal intensity also increases six-fold compared with that under UV LED excitation. The high sensitivity is further confirmed by imaging the single europium-doped Y2O2S nanocrystals (150 nm). We report technical details regarding the time-gating detection unit and demonstrate its compatibility with commercial epi-fluorescence microscopes, providing a valuable and convenient addition to standard laboratory equipment.

Published
2014

24. Luminescence Properties of Mesoporous Silica Nanoparticles Encapsulating Different Europium Complexes: Application for Biolabelling

Author

Lechevallier, S., primary, Jorge, J., additional, Silveira, R. M., additional, Ratel-Ramond, N., additional, Neumeyer, D., additional, Menu, M. J., additional, Gressier, M., additional, Marçal, A. L., additional, Rocha, A. L., additional, Martines, M. A. U., additional, Magdeleine, E., additional, Dexpert-Ghys, J., additional, and Verelst, M., additional

Published
2013
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25. Mesures contre l'érosion et sensibilisation des agriculteurs en faveur du milieu (MESAM)

Author

UCL - AGRO/MILA - Département des sciences du milieu et de l'aménagement du territoire, UCL - SST/ELI/ELIE - Environmental Sciences, Van Den Hende, S., Baetens, K., Bielders, Charles, Claerbout, S., Dejonghe, A.E., Derancourt, Fr., Desmet, J., Gabriëls, D., Haan, Paul-Marie, Loyen, St., Mahieu, J., Mortreux, P., Schiettecatte, W., Schvartz, Chr., Verbist, K., Verelst, M., Foire Agricole, UCL - AGRO/MILA - Département des sciences du milieu et de l'aménagement du territoire, UCL - SST/ELI/ELIE - Environmental Sciences, Van Den Hende, S., Baetens, K., Bielders, Charles, Claerbout, S., Dejonghe, A.E., Derancourt, Fr., Desmet, J., Gabriëls, D., Haan, Paul-Marie, Loyen, St., Mahieu, J., Mortreux, P., Schiettecatte, W., Schvartz, Chr., Verbist, K., Verelst, M., and Foire Agricole

Published
2005

28. Nanocomposites materials generated from a spray

Author

Marques, R.F.C., primary, Caiut, J.M.A., additional, Paiva-Santos, C.O., additional, Ribeiro, S.J.L., additional, Messaddeq, Y., additional, Garcia, C., additional, Neumeyer, D., additional, Dexpert, H., additional, Verelst, M., additional, and Dexpert-Ghys, J., additional

Published
2009
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45. Surface effects on the magnetic properties of ultrafine cobalt particles

Author

Respaud, M., primary, Broto, J. M., additional, Rakoto, H., additional, Fert, A. R., additional, Thomas, L., additional, Barbara, B., additional, Verelst, M., additional, Snoeck, E., additional, Lecante, P., additional, Mosset, A., additional, Osuna, J., additional, Ely, T. Ould, additional, Amiens, C., additional, and Chaudret, B., additional

Published
1998
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47. Elaboration, Characterisation, and Magnetic Properties of Cobalt Fine Particles

Author

Respaud, Marc, primary, Broto, J.M., additional, Thomas, L., additional, Barbara, B., additional, Rakoto, H., additional, Goiran, M., additional, Fert, A.R., additional, Snoeck, E., additional, Verelst, M., additional, Lecante, P., additional, Osuna, J., additional, Ould Ely, T., additional, Amiens, C., additional, and Chaudret, B., additional

Published
1998
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