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Argo-Leignel D, Bouju P, Le Saux M, Leissen N, Guégan R, Pointreau Y, Alexandre Y, Bera G. [Clinical research in general hospital centres in France, strengths and weaknesses]. Cancer Radiother 2023; 27:460-463. [PMID: 37573194 DOI: 10.1016/j.canrad.2023.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 07/07/2023] [Accepted: 07/10/2023] [Indexed: 08/14/2023]
Abstract
Clinical research is an essential activity in cancer care. Both for patients, who can gain access to innovative therapies, and for practitioners, who can maintain their skills and stay at the forefront of new treatment approaches. First developed in university hospitals, clinical research is now established in general hospitals and private health institutions. The number of patient inclusions in clinical trials has doubled over the last ten years, thus reflecting the dynamism of it. Strengths and weaknesses, opportunities and threats concerning clinical research, and more specifically clinical research in general hospitals, are exposed in this article.
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Affiliation(s)
- D Argo-Leignel
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France.
| | - P Bouju
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France
| | - M Le Saux
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France
| | - N Leissen
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France
| | - R Guégan
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France
| | - Y Pointreau
- Institut inter-régional de cancérologie (ILC), centre Jean-Bernard, 64, rue de Degré, 72000 Le Mans, France
| | - Y Alexandre
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France
| | - G Bera
- Groupe hospitalier Bretagne Sud, 5, avenue de Choiseul, 56520 Lorient, France
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2
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Bonetto L, Crespo J, Guégan R, Esteves V, Giovanela M. Removal of methylene blue from aqueous solutions using a solid residue of the apple juice industry: Full factorial design, equilibrium, thermodynamics and kinetics aspects. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129296] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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3
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De Marco C, Mauler RS, Daitx TS, Krindges I, Cemin A, Bonetto LR, Crespo JS, Guégan R, Carli LN, Giovanela M. Removal of malachite green dye from aqueous solutions by a magnetic adsorbent. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1585455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- C. De Marco
- Área do Conhecimento de Ciências Exatas e Engenharias, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
| | - R. S. Mauler
- Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - T. S. Daitx
- Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - I. Krindges
- Área do Conhecimento de Ciências Exatas e Engenharias, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
| | - A. Cemin
- Área do Conhecimento de Ciências Exatas e Engenharias, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
| | - L. R. Bonetto
- Área do Conhecimento de Ciências Exatas e Engenharias, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
| | - J. S. Crespo
- Área do Conhecimento de Ciências Exatas e Engenharias, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
| | - R. Guégan
- Faculty of Science and Engineering, Global Center for Science and Engineering, Waseda University, Tokyo, Japan
| | - L. N. Carli
- Campus Blumenau, Universidade Federal de Santa Catarina, Blumenau, Santa Catarina, Brazil
| | - M. Giovanela
- Área do Conhecimento de Ciências Exatas e Engenharias, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
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4
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Kania M, Gautier M, Ni Z, Bonjour E, Guégan R, Michel P, Jame P, Liu J, Gourdon R. Analytical indicators to characterize Particulate Organic Matter (POM) and its evolution in French Vertical Flow Constructed Wetlands (VFCWs). Sci Total Environ 2018; 622-623:801-813. [PMID: 29223907 DOI: 10.1016/j.scitotenv.2017.11.357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 11/30/2017] [Accepted: 11/30/2017] [Indexed: 06/07/2023]
Abstract
The design of French VFCWs leads to the formation of a sludge layer at the surface of the first filters due to the retention of suspended solids from the percolation of unsettled wastewater. This layer plays a major role in the system but still little is known on its characteristics and evolutions. In this study, suspended solids and sludge deposits sampled from two French VFCW plants were analyzed by different methods in the objective to assess the evolution of particulate organic matter (POM) along the treatment chain and within the sludge layer, and identify relevant analytical indicators of these phenomena. The treatment chain included an aerobic trickling filter followed by FeCl3 injection and two successive stages of filters. Thermal analyses showed that OM contents of suspended solids decreased along the treatment chain. POM in inflow suspended solids was predominantly composed of reactive, biodegradable compounds which were partly hydrolyzed and mineralized notably at the trickling filter stage. 3D fluorescence spectra collected from aqueous POM extracts confirmed the evolution of organic matter from low-molecular reactive compounds to more complex and stable structures such as humic-like substances. FTIR confirmed the mineralization of POM's reactive constituents along the treatment chain by the decrease in the intensities of the characteristics bands of aliphatic compounds or proteins, and its humification in the sludge deposits through the relative increase of the bands at 1634cm-1 (vC=O) and 1238cm-1 (δC=O and/or δOH). Isotopic ratios δ2H/1H and δ15N/14N were found to be good indicators of POM evolutions. The higher values of δ2H/1H and δ15N/14N ratios measured in sludge deposits as compared to inflow suspended solids were related to POM humification and to microbial processes of POM hydrolysis and mineralization, respectively.
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Affiliation(s)
- M Kania
- Univ Lyon, INSA Lyon, DEEP Laboratory (Déchets Eaux Environnement Pollutions), EA 7429, F-69621 Villeurbanne Cedex, France; SCIRPE, 5 Allée Alban Vistel, 69110 Sainte-Foy-Lès-Lyon, France.
| | - M Gautier
- Univ Lyon, INSA Lyon, DEEP Laboratory (Déchets Eaux Environnement Pollutions), EA 7429, F-69621 Villeurbanne Cedex, France.
| | - Z Ni
- Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 10084, China
| | - E Bonjour
- Univ Lyon, CNRS, Université Claude Bernard Lyon 1, Ens de Lyon, Institut des Sciences Analytiques, UMR 5280, 5 rue de la Doua, 69100 Villeurbanne, France.
| | - R Guégan
- Observatoire des Sciences de l'Univers en région Centre (OSUC), 1 A rue de la Férollerie, 45071 Orléans Cedex 2, France.
| | - P Michel
- SCIRPE, 5 Allée Alban Vistel, 69110 Sainte-Foy-Lès-Lyon, France.
| | - P Jame
- Univ Lyon, CNRS, Université Claude Bernard Lyon 1, Ens de Lyon, Institut des Sciences Analytiques, UMR 5280, 5 rue de la Doua, 69100 Villeurbanne, France.
| | - J Liu
- Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 10084, China.
| | - R Gourdon
- Univ Lyon, INSA Lyon, DEEP Laboratory (Déchets Eaux Environnement Pollutions), EA 7429, F-69621 Villeurbanne Cedex, France.
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Gujel AA, Bandeira M, Menti C, Perondi D, Guégan R, Roesch-Ely M, Giovanela M, Crespo JS. Evaluation of vulcanization nanoactivators with low zinc content: characterization of zinc oxides, cure, physico-mechanical properties, Zn2+release in water and cytotoxic effect of EPDM compositions. POLYM ENG SCI 2017. [DOI: 10.1002/pen.24781] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- A. A. Gujel
- Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas; Caxias do Sul, RS, 1130, 95070-560 Brazil
| | - M. Bandeira
- Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas; Caxias do Sul, RS, 1130, 95070-560 Brazil
| | - C. Menti
- Instituto de Biotecnologia; Universidade de Caxias do Sul; Rua Francisco Getúlio Vargas, 1130, Caxias do Sul, RS, 95070-560 Brazil
| | - D. Perondi
- Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas; Caxias do Sul, RS, 1130, 95070-560 Brazil
| | - R. Guégan
- Institut des Sciences de La Terre d'Orléans, UMR 7327, CNRS; Universite d'Orléans; 1A rue de La Férollerie 45071, Orléans, Cedex 2 France
| | - M. Roesch-Ely
- Instituto de Biotecnologia; Universidade de Caxias do Sul; Rua Francisco Getúlio Vargas, 1130, Caxias do Sul, RS, 95070-560 Brazil
| | - M. Giovanela
- Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas; Caxias do Sul, RS, 1130, 95070-560 Brazil
| | - J. S. Crespo
- Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas; Caxias do Sul, RS, 1130, 95070-560 Brazil
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Gaboyer F, Le Milbeau C, Bohmeier M, Schwendner P, Vannier P, Beblo-Vranesevic K, Rabbow E, Foucher F, Gautret P, Guégan R, Richard A, Sauldubois A, Richmann P, Perras AK, Moissl-Eichinger C, Cockell CS, Rettberg P, Marteinsson, Monaghan E, Ehrenfreund P, Garcia-Descalzo L, Gomez F, Malki M, Amils R, Cabezas P, Walter N, Westall F. Mineralization and Preservation of an extremotolerant Bacterium Isolated from an Early Mars Analog Environment. Sci Rep 2017; 7:8775. [PMID: 28821776 PMCID: PMC5562696 DOI: 10.1038/s41598-017-08929-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 07/14/2017] [Indexed: 11/09/2022] Open
Abstract
The artificial mineralization of a polyresistant bacterial strain isolated from an acidic, oligotrophic lake was carried out to better understand microbial (i) early mineralization and (ii) potential for further fossilisation. Mineralization was conducted in mineral matrixes commonly found on Mars and Early-Earth, silica and gypsum, for 6 months. Samples were analyzed using microbiological (survival rates), morphological (electron microscopy), biochemical (GC-MS, Microarray immunoassay, Rock-Eval) and spectroscopic (EDX, FTIR, RAMAN spectroscopy) methods. We also investigated the impact of physiological status on mineralization and long-term fossilisation by exposing cells or not to Mars-related stresses (desiccation and radiation). Bacterial populations remained viable after 6 months although the kinetics of mineralization and cell-mineral interactions depended on the nature of minerals. Detection of biosignatures strongly depended on analytical methods, successful with FTIR and EDX but not with RAMAN and immunoassays. Neither influence of stress exposure, nor qualitative and quantitative changes of detected molecules were observed as a function of mineralization time and matrix. Rock-Eval analysis suggests that potential for preservation on geological times may be possible only with moderate diagenetic and metamorphic conditions. The implications of our results for microfossil preservation in the geological record of Earth as well as on Mars are discussed.
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Affiliation(s)
- F Gaboyer
- Centre de Biophysique Moléculaire, CNRS, Orléans, France.
| | - C Le Milbeau
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071, Orléans Cedex 2, France
| | - M Bohmeier
- Institute of Aerospace Medicine, Radiation Biology Department, German Aerospace Center (DLR), Cologne, Germany
| | - P Schwendner
- UK Center for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - P Vannier
- MATIS - Prokaria, Reykjavík, Iceland
| | - K Beblo-Vranesevic
- Institute of Aerospace Medicine, Radiation Biology Department, German Aerospace Center (DLR), Cologne, Germany
| | - E Rabbow
- Institute of Aerospace Medicine, Radiation Biology Department, German Aerospace Center (DLR), Cologne, Germany
| | - F Foucher
- Centre de Biophysique Moléculaire, CNRS, Orléans, France
| | - P Gautret
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071, Orléans Cedex 2, France
| | - R Guégan
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071, Orléans Cedex 2, France
| | - A Richard
- Centre de Microscopie Electronique, Université d'Orléans, Orléans, France
| | - A Sauldubois
- Centre de Microscopie Electronique, Université d'Orléans, Orléans, France
| | - P Richmann
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071, Orléans Cedex 2, France
| | - A K Perras
- University Regensburg, Department of Microbiology, Regensburg, Germany.,Medical University of Graz, Department of Internal Medicine, Graz, Austria
| | | | - C S Cockell
- UK Center for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - P Rettberg
- Institute of Aerospace Medicine, Radiation Biology Department, German Aerospace Center (DLR), Cologne, Germany
| | | | - E Monaghan
- Leiden Observatory, Universiteit Leiden, Leiden, Netherlands
| | - P Ehrenfreund
- Leiden Observatory, Universiteit Leiden, Leiden, Netherlands
| | - L Garcia-Descalzo
- Instituto Nacional de Técnica Aeroespacial - Centro de Astrobiología (INTA-CAB), Madrid, Spain
| | - F Gomez
- Instituto Nacional de Técnica Aeroespacial - Centro de Astrobiología (INTA-CAB), Madrid, Spain
| | - M Malki
- Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - R Amils
- Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - P Cabezas
- European Science Foundation (ESF), Strasbourg, France
| | - N Walter
- European Science Foundation (ESF), Strasbourg, France
| | - F Westall
- Centre de Biophysique Moléculaire, CNRS, Orléans, France
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Guégan R, Sueyoshi K, Anraku S, Yamamoto S, Miyamoto N. Sandwich organization of non-ionic surfactant liquid crystalline phases as induced by large inorganic K4Nb6O17 nanosheets. Chem Commun (Camb) 2016; 52:1594-7. [PMID: 26660331 DOI: 10.1039/c5cc08948d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While retaining its lamellar liquid crystal phase, K4Nb6O17 nanosheets were used as a template to sandwich and stabilize an alkylpoly(ethylene oxide) nonionic surfactant-water system showing monodomain (lamella) formation within the inorganic niobate sheets that appears to be not dependent on the surfactant liquid crystalline state in solution but more its concentration.
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Affiliation(s)
- R Guégan
- Institut des Sciences de la Terre d'Orléans, UMR 7327 CNRS-Université d'Orléans, Orléans 45071, France.
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8
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Thiebault T, Boussafir M, Le Forestier L, Le Milbeau C, Monnin L, Guégan R. Correction: Competitive adsorption of a pool of pharmaceuticals onto a raw clay mineral. RSC Adv 2016. [DOI: 10.1039/c6ra90061e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘Competitive adsorption of a pool of pharmaceuticals onto a raw clay mineral’ by T. Thiebault et al., RSC Adv., 2016, 6, 65257–65265.
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Affiliation(s)
- T. Thiebault
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - M. Boussafir
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - L. Le Forestier
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - C. Le Milbeau
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - L. Monnin
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - R. Guégan
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
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Thiebault T, Boussafir M, Le Forestier L, Le Milbeau C, Monnin L, Guégan R. Competitive adsorption of a pool of pharmaceuticals onto a raw clay mineral. RSC Adv 2016. [DOI: 10.1039/c6ra10655b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The removal of a Pharmaceutically Active Compound (PhAC) pool using a well referenced clay mineral from Wyoming (SWy-2) as a geosorbent was studied for a better understanding of the environmental fate.
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Affiliation(s)
- T. Thiebault
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - M. Boussafir
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - L. Le Forestier
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - C. Le Milbeau
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - L. Monnin
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
| | - R. Guégan
- Institut des Sciences de la Terre d'Orléans
- UMR 7327
- Univ Orléans
- CNRS
- BRGM
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Hattab N, Soubrand M, Guégan R, Motelica-Heino M, Bourrat X, Faure O, Bouchardon JL. Effect of organic amendments on the mobility of trace elements in phytoremediated techno-soils: role of the humic substances. Environ Sci Pollut Res Int 2014; 21:10470-80. [PMID: 24854499 DOI: 10.1007/s11356-014-2959-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Accepted: 04/21/2014] [Indexed: 05/22/2023]
Abstract
The efficiency of aided phytostabilization using organic amendments such as ramial chipped wood (RCW) and composted sewage sludge (CSS) was studied on contaminated techno-soils, on nine experimental plots. The objective was to characterize the role of fulvic (FA) and humic acids (HA) on the mobilization of trace elements, specifically As, Cu, Mo, Pb and Zn. Results showed that the addition of CSS increased the total organic carbon and nitrogen content more than with RCW and as a result, the C/N ratio in the CSS soil was higher than in the RCW and non-amended (NE) soil, reflecting the high decomposition of soil organic matter in the CSS soil compared with the other soils. The RCW and CSS amendments increased the hydrogen index (HI) values and the oxygen index (OI) values compared with the NE soil, especially for the soil treated with CSS which contained more aliphatic than aromatic compounds. The addition of CSS to the techno-soil significantly increased the percentage of C org associated with the HA fractions compared with the RCW and NE soils. The soil amended with CSS showed the highest E 4/E 6 ratio and the lowest E 2/E 3 ratio of FA. Zn and As were more abundant in the FA fraction than in the HA fraction, whereas Pb, Cu and Mo were more associated to HA than to FA in the treated and untreated soils, which may explain the difference in their mobility and availability.
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Affiliation(s)
- N Hattab
- ISTO, UMR 6113 CNRS University of Orléans, Orleans, France,
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Guégan R, Morineau D, Lefort R, Béziel W, Guendouz M, Noirez L, Henschel A, Huber P. Rich polymorphism of a rod-like liquid crystal (8CB) confined in two types of unidirectional nanopores. Eur Phys J E Soft Matter 2008; 26:261-273. [PMID: 18509593 DOI: 10.1140/epje/i2007-10323-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2007] [Accepted: 04/10/2008] [Indexed: 05/26/2023]
Abstract
We present a neutron and X-rays scattering study of the phase transitions of 4-n-octyl-4' -cyanobiphenyl (8CB) confined in unidirectional nanopores of porous alumina and porous silicon (PSi) membranes with an average diameter of 30 nm. Spatial confinement reveals a rich polymorphism, with at least four different low temperature phases in addition to the smectic A phase. The structural study as a function of thermal treatments and conditions of spatial confinement allows us to get insights into the formation of these phases and their relative stability. It gives the first description of the complete phase behavior of 8CB confined in PSi and provides a direct comparison with results obtained in bulk conditions and in similar geometric conditions of confinement but with reduced quenched disorder effects using alumina anopore membranes.
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Affiliation(s)
- R Guégan
- Institut de Physique de Rennes, CNRS-UMR 6251, Université de Rennes 1, Rennes, France
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12
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Guégan R, Morineau D, Lefort R, Moréac A, Béziel W, Guendouz M, Zanotti JM, Frick B. Molecular dynamics of a short-range ordered smectic phase nanoconfined in porous silicon. J Chem Phys 2007; 126:064902. [PMID: 17313239 DOI: 10.1063/1.2435366] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
4-n-octyl-4-cyanobiphenyl has been recently shown to display an unusual sequence of phases when confined into porous silicon (PSi). The gradual increase of oriented short-range smectic (SRS) correlations in place of a phase transition has been interpreted as a consequence of the anisotropic quenched disorder induced by confinement in PSi. Combining two quasielastic neutron scattering experiments with complementary energy resolutions, the authors present the first investigation of the individual molecular dynamics of this system. A large reduction of the molecular dynamics is observed in the confined liquid phase, as a direct consequence of the boundary conditions imposed by the confinement. Temperature fixed window scans reveal a continuous glasslike reduction of the molecular dynamics of the confined liquid and SRS phases on cooling down to 250 K, where a solidlike behavior is finally reached by a two-step crystallization process.
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Affiliation(s)
- R Guégan
- Groupe Matière Condensée et Matériaux, CNRS-UMR 6626, Bâtiment 11A, Université de Rennes 1, F-35042 Rennes, France
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13
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Calderaro A, Bommezzadri S, Incaprera M, Piccolo G, Zuelli C, Guégan R, Villanacci V, Pirali F, Viviani G, Arcangeletti M, Medici M, Dettori G, Chezzi C. DIAGNOSI DI LABORATORIO DI AMEBIASI MEDIANTE REAZIONE POLIMERASICA A CATENA (PCR). Microbiol Med 2003. [DOI: 10.4081/mm.2003.4222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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14
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Calderaro A, Villanacci V, Bommezzadri S, Piccolo G, Zuelli C, Incaprera M, Guégan R, Arcangeletti M, Medici M, Dettori G, Chezzi C. DIAGNOSI DI LABORATORIO DI SPIROCHETOSI INTESTINALE DA BRACHYSPIRA AALBORGI. Microbiol Med 2003. [DOI: 10.4081/mm.2003.4225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Calderaro A, Piccolo G, Bommezzadri S, Incaprera M, Zuelli C, Guégan R, Arcangeletti M, Medici M, Dettori G, Chezzi C. DIAGNOSI DI LABORATORIO DI BORRELIOSI, LEPTOSPIROSI E SIFILIDE MEDIANTE METODI MOLECOLARI AVANZATI. Microbiol Med 2003. [DOI: 10.4081/mm.2003.4395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Calderaro A, Dettori G, Ragni P, Guégan R, Arcangeletti MC, Medici MC, Chezzi C. Brachyspira (Serpulina) pilosicoli of human origin interfere with the growth of Clostridium perfringens alpha-toxin producer. New Microbiol 2002; 25:139-47. [PMID: 12019719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Brachyspira (Serpulina) pilosicoli of human origin interfere with the growth of Clostridium perfringens alpha-toxin producer reducing the clostridial growth area and colonies number when bacteria were cultivated together in sheep blood agar plates. The growth inhibition of C. perfringens was only observed when B. (S.) pilosicoli grew 72-96 hours sooner than C. perfringens and after the inoculum of this latter the plates were anaerobically incubated for additional 48 hours. The phenomenon was observed at concentrations of B. (S.) pilosicoli ranging from 10(7) to 10(4) CFU/ml and at concentrations of C. perfringens ranging from 10(7) to 10(1) CFU/ml when the bacteria were 0-10 mm away from each other. When B. (S.) pilosicoli and C. perfringens were inoculated at the same time and when B. (S.) pilosicoli grew 24-48 hours sooner than C. perfringens, the clostridial growth inhibition was not appreciated and only a cooperative haemolysis was observed between the bacteria.
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Affiliation(s)
- A Calderaro
- Department of Pathology and Laboratory Medicine-Section of Microbiology, University of Parma, Italy
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Calderaro A, Merialdi G, Perini S, Ragni P, Guégan R, Dettori G, Chezzi C. A novel method for isolation of Brachyspira (Serpulina) hyodysenteriae from pigs with swine dysentery in Italy. Vet Microbiol 2001; 80:47-52. [PMID: 11278122 DOI: 10.1016/s0378-1135(00)00374-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Brachyspira (Serpulina) hyodysenteriae was isolated from 10 of 11 pigs with clinically suspected swine dysentery in six herds in northern Italy. All strains were successfully isolated in the selective blood agar modified medium with spectinomycin and rifampin (BAM-SR) currently used in our laboratory to isolate B. (S.) pilosicoli of human origin, after pre-treatment of intestinal material with spectinomycin and rifampin in foetal calf serum. Isolates had phenotypic characteristics typical of B. (S.) hyodysenteriae.
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Affiliation(s)
- A Calderaro
- Department of Pathology and Laboratory Medicine, Section of Microbiology, University of Parma, Viale A. Gramsci, 14-43100, Parma, Italy
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Calderaro A, Dettori G, Grillo R, Cattani P, Ragni P, Guégan R, Fadda G, Chezzi C. Weakly beta-haemolytic human intestinal spirochaetes antagonize the haemolytic activity of Clostridium perfringens alpha-toxin producer. New Microbiol 2001; 24:125-36. [PMID: 11346295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
The production of haemolytic antagonism between weakly beta-haemolytic human intestinal spirochaetes (wbetaHIS) related to human intestinal spirochaetosis and Clostridium perfringens alpha-toxin producer was investigated. A reduction of the clostridial haemolytic activity and a distortion of the haemolytic halo of clostridial alpha-toxin surrounded by a small zone of poorly cooperative haemolysis was clearly observed on the level of the spirochaetal growth area when 40 out of 41 wbetaHIS were cultivated in sheep blood agar plates together with Clostridium perfringens alpha-toxin producer. This phenomenon of haemolytic antagonism was observed only when wbetaHIS grew 72-96 hours sooner than C. perfringens and after the inoculum of the latter at a distance of 0 to 10 mm from wbetaHIS the plates were anaerobically incubated for an additional 48 hours and the bacteria were used at concentrations ranging from 10(7) to 10(4) CFU/ml. These results were also observed between C. perfringens and weakly beta-haemolytic intestinal spirochaetes related to animal intestinal spirochaetosis including avian strains and Brachyspira (Serpulina) pilosicoli of porcine origin.
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Affiliation(s)
- A Calderaro
- Department of Pathology and Laboratory Medicine, University of Parma, Italy
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Calderaro A, Cattani P, Dettori G, Ragni P, Grillo R, Guégan R, Fadda G, Chezzi C. Detection of same sized 4.3 Kb extrachromosomal DNA elements in weakly beta-haemolytic human intestinal spirochaetes and Serpulina pilosicoli of swine origin. New Microbiol 2000; 23:1-10. [PMID: 10946400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Agarose gel electrophoresis of total DNA from Italian strains of weakly beta-haemolytic human intestinal spirochaetes (w beta HIS) and porcine Serpulina pilosicoli reference strain P43/6/78 showed an extrachromosomal band having the same size and migrating at 4.3 Kb. The same results were observed after agarose gel electrophoresis of DNA obtained from the supernatant fluids of the spirochaetal cultures analysed. Swine Serpulina hyodysenteriae reference strain P18A was comparatively analysed and a 6.5 Kb extrachromosomal DNA element was found, as expected. Furthermore, S. hyodysenteriae reference strain P18A differed from all the other spirochaetes tested and had a higher number of flagella (8-12) at each cell end and was strongly beta-haemolytic. To the best of our knowledge, this is the first report on the detection of a band of extrachromosomal DNA having the same size in w beta HIS and S. pilosicoli from swine origin.
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Affiliation(s)
- A Calderaro
- Institute of Microbiology, Faculty of Medicine and Surgery, University of Parma, Italy
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Guégan R, Diaz J, Cazaubon C, Beaumont M, Carlet C, Clément J, Demarne H, Mellet M, Richaud JP, Segondy D. Pepstatin analogues as novel renin inhibitors. J Med Chem 1986; 29:1152-9. [PMID: 3543358 DOI: 10.1021/jm00157a006] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Pepstatin analogues corresponding to the general formula A-X-Y-Sta-Ala-Sta-R were synthesized in solution phase. Various changes in the nature of the A, X, and Y groups were made to improve the inhibitory potency against human plasma renin activity. The results were interpreted by use of the active-site model based on the sequence of human angiotensinogen. The tert-butyloxycarbonyl group and the isovaleryl group were found to be the most effective acyl groups (A). The analogues having a Phe residue in place of Val1 (X) and His or amino acid with an aliphatic side chain such as norleucine or norvaline in the Y position showed the highest inhibition of human plasma renin activity with IC50 values of about 10(-8)M. Esterification or amidification of the carboxyl group of the C-terminal statine did not change the inhibitory potency. The selectivity for rat, dog, pig, and monkey plasma renin of the most interesting compounds was studied.
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