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Zorai A, SOUICI A, Dragoe D, Riviere E, Ouhenia S, Belloni J, Mostafavi M. Superparamagnetic cobalt ferrite nanoparticles synthesized by gamma irradiation. NEW J CHEM 2023. [DOI: 10.1039/d2nj05433g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The radiolytic method is used to synthesize ultra-small cobalt ferrite nanoparticles, CoFe2O4, exhibiting superparamagnetic properties. These systems are investigated by studying their properties at increasing dose of the irradiation process....
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Ouafek N, Keghouche N, Beaunier P, Belloni J, Mostafavi M. Antibacterial activity of intermetallic NixMgy and NiO–MgO phases in nickel-magnesium oxide nanocomposites. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110499] [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: 11/16/2022]
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Cho HG, Kim S, Choi S, Cho S, Jung W, Kim S, Park G, Song S, Pereira S, Song H, Park S, Mostafavi M, Paeng K, Ock CY. 900P AI-powered analyzer reveals enrichment of intra-tumoral tumor-infiltrating lymphocytes in high-grade neuroendocrine neoplasms. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1026] [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: 11/15/2022] Open
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Afra B, Amiri Delouei A, Mostafavi M, Tarokh A. Fluid-structure interaction for the flexible filament's propulsion hanging in the free stream. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114941] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Behmand B, Noronha AM, Wilds CJ, Marignier JL, Mostafavi M, Wagner JR, Hunting DJ, Sanche L. Hydrated electrons induce the formation of interstrand cross-links in DNA modified by cisplatin adducts. J Radiat Res 2020; 61:343-351. [PMID: 32211848 PMCID: PMC7299263 DOI: 10.1093/jrr/rraa014] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 01/17/2020] [Indexed: 06/10/2023]
Abstract
Double-stranded oligonucleotides containing cisplatin adducts, with and without a mismatched region, were exposed to hydrated electrons generated by gamma-rays. Gel electrophoresis analysis demonstrates the formation of cisplatin-interstrand crosslinks from the cisplatin-intrastrand species. The rate constant per base for the reaction between hydrated electrons and the double-stranded oligonucleotides with and without cisplatin containing a mismatched region was determined by pulse radiolysis to be 7 × 109 and 2 × 109 M-1 s-1, respectively. These results provide a better understanding of the radiosensitizing effect of cisplatin adducts in hypoxic tumors and of the formation of interstrand crosslinks, which are difficult for cells to repair.
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Affiliation(s)
- B Behmand
- Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - A M Noronha
- Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, H4B1R6, Canada
| | - C J Wilds
- Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, H4B1R6, Canada
| | - J-L Marignier
- Centre de cinétique rapide ELYSE, Laboratoire de chimie physique, Université de Paris-Saclay 11, Orsay, France
| | - M Mostafavi
- Centre de cinétique rapide ELYSE, Laboratoire de chimie physique, Université de Paris-Saclay 11, Orsay, France
| | - J R Wagner
- Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - D J Hunting
- Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
| | - L Sanche
- Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada
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Musat R, Marignier JL, Le Naour C, Denisov S, Venault L, Moisy P, Mostafavi M. Pulse radiolysis study on the reactivity of NO 3˙ radical toward uranous(iv), hydrazinium nitrate and hydroxyl ammonium nitrate at room temperature and at 45 °C. Phys Chem Chem Phys 2020; 22:5188-5197. [PMID: 32090224 DOI: 10.1039/c9cp07034f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Concentrated nitric acid solutions subjected to radiation produce radicals of extreme importance in the reprocessing of spent nuclear fuel. Knowledge of the different rate constants of the reactions involved in this chemistry is needed to improve the efficiency of the process and to define safe operating practices. Pulse radiolysis measurements are performed to find the rate constant of the reaction between NO3˙ radicals and U(iv) in highly concentrated nitrate solution. The optimal stabilization conditions toward thermal oxidation are defined for the considered solutions at room temperature and at 45 °C by adding anti-nitrous agents such as hydrazinium nitrate (HN) and hydroxyl ammonium nitrate (HAN). The decay of the NO3˙ radical is monitored and its reaction rates with HN, HAN and U(iv) are found to be 1.3 × 105, 1.5 × 107 and 1.6 × 106 M-1 s-1 at room temperature. The latter value is more than 10 times lower than the one currently used in numerical codes for simulation of the long-term radiolytic degradation associated with the reprocessing and storage of spent nuclear waste. At 45 °C, conditions similar to the reprocessing of spent fuel, the values of the rate constants of NO3˙ radical toward HN, HAN and U(iv) increase and are found to be 2.6 × 105, 2.9 × 107 and 9.3 × 106 M-1 s-1.
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Affiliation(s)
- R Musat
- Institut de Chimie Physique CNRS-Université Paris-Saclay, 91405 Orsay, France.
| | - J L Marignier
- Institut de Chimie Physique CNRS-Université Paris-Saclay, 91405 Orsay, France.
| | - C Le Naour
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
| | - S Denisov
- Institut de Chimie Physique CNRS-Université Paris-Saclay, 91405 Orsay, France.
| | - L Venault
- CEA, DEN, DMRC, Univ Montpellier, France
| | - Ph Moisy
- CEA, DEN, DMRC, Univ Montpellier, France
| | - M Mostafavi
- Institut de Chimie Physique CNRS-Université Paris-Saclay, 91405 Orsay, France.
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Keghouche N, Mostafavi M, Delcourt MO, Picq G. Radiolyse de solutions aqueuses de polyacrylate d'argent : premiers clusters oligomères Agn (n = 1 à 4). ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1993900777] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Lainé M, Balan E, Allard T, Paineau E, Jeunesse P, Mostafavi M, Robert JL, Le Caër S. Reaction mechanisms in swelling clays under ionizing radiation: influence of the water amount and of the nature of the clay mineral. RSC Adv 2017. [DOI: 10.1039/c6ra24861f] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [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
Picosecond pulse radiolysis experiments performed on natural swelling clays evidence a fast trapping of electrons in the layers of the material.
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Affiliation(s)
- M. Lainé
- LIONS
- NIMBE
- CEA
- CNRS
- Université Paris Saclay
| | - E. Balan
- IMPMC
- Sorbonne Universities
- UPMC
- CNRS UMR-7590
- MNHN
| | - T. Allard
- IMPMC
- Sorbonne Universities
- UPMC
- CNRS UMR-7590
- MNHN
| | - E. Paineau
- Laboratoire de Physique des Solides
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay Cedex
| | - P. Jeunesse
- Laboratoire de Chimie Physique
- CNRS/Université Paris-Sud
- F-91405 Orsay
- France
| | - M. Mostafavi
- Laboratoire de Chimie Physique
- CNRS/Université Paris-Sud
- F-91405 Orsay
- France
| | | | - S. Le Caër
- LIONS
- NIMBE
- CEA
- CNRS
- Université Paris Saclay
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Mostafavi M, Bradley R, Armstrong DEJ, Marrow TJ. Quantifying yield behaviour in metals by X-ray nanotomography. Sci Rep 2016; 6:34346. [PMID: 27698472 PMCID: PMC5048129 DOI: 10.1038/srep34346] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 06/02/2016] [Accepted: 09/07/2016] [Indexed: 12/02/2022] Open
Abstract
Nanoindentation of engineering materials is commonly used to study, at small length scales, the continuum mechanical properties of elastic modulus and yield strength. However, it is difficult to measure strain hardening via nanoindentation. Strain hardening, which describes the increase in strength with plastic deformation, affects fracture toughness and ductility, and is an important engineering material property. The problem is that the load-displacement data of a single nanoindentation do not provide a unique solution for the material’s plastic properties, which can be described by its stress-strain behaviour. Three-dimensional mapping of the displacement field beneath the indentation provides additional information that can overcome this difficulty. We have applied digital volume correlation of X-ray nano-tomographs of a nanoindentation to measure the sub-surface displacement field and so obtain the plastic properties of a nano-structured oxide dispersion strengthened steel. This steel has potential applications in advanced nuclear energy systems, and this novel method could characterise samples where proton irradiation of the surface simulates the effects of fast neutron damage, since facilities do not yet exist that can replicate this damage in bulk materials.
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Affiliation(s)
- M Mostafavi
- Department of Mechanical Engineering, Queen's Building, University of Bristol, University Walk, Bristol BS8 1TR, UK
| | - R Bradley
- Manchester X-ray Imaging Facility, Photon Science Institute, Alan Turing Building, The University of Manchester, Manchester M13 9PL, UK
| | - D E J Armstrong
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, Oxford, UK
| | - T J Marrow
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, Oxford, UK.,Oxford Martin School, University of Oxford, 34 Broad Street, Oxford, OX1 3BD, UK
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Fokstuen S, Makrythanasis P, Hammar E, Guipponi M, Ranza E, Varvagiannis K, Santoni FA, Albarca-Aguilera M, Poleggi ME, Couchepin F, Brockmann C, Mauron A, Hurst SA, Moret C, Gehrig C, Vannier A, Bevillard J, Araud T, Gimelli S, Stathaki E, Paoloni-Giacobino A, Bottani A, Sloan-Béna F, Sizonenko LD, Mostafavi M, Hamamy H, Nouspikel T, Blouin JL, Antonarakis SE. Experience of a multidisciplinary task force with exome sequencing for Mendelian disorders. Hum Genomics 2016; 10:24. [PMID: 27353043 PMCID: PMC4924303 DOI: 10.1186/s40246-016-0080-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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: 12/09/2015] [Accepted: 06/17/2016] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND In order to optimally integrate the use of high-throughput sequencing (HTS) as a tool in clinical diagnostics of likely monogenic disorders, we have created a multidisciplinary "Genome Clinic Task Force" at the University Hospitals of Geneva, which is composed of clinical and molecular geneticists, bioinformaticians, technicians, bioethicists, and a coordinator. METHODS AND RESULTS We have implemented whole exome sequencing (WES) with subsequent targeted bioinformatics analysis of gene lists for specific disorders. Clinical cases of heterogeneous Mendelian disorders that could potentially benefit from HTS are presented and discussed during the sessions of the task force. Debate concerning the interpretation of identified variants and the content of the final report constitutes a major part of the task force's work. Furthermore, issues related to bioethics, genetic counseling, quality control, and reimbursement are also addressed. CONCLUSIONS This multidisciplinary task force has enabled us to create a platform for regular exchanges between all involved experts in order to deal with the multiple complex issues related to HTS in clinical practice and to continuously improve the diagnostic use of HTS. In addition, this task force was instrumental to formally approve the reimbursement of HTS for molecular diagnosis of Mendelian disorders in Switzerland.
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Affiliation(s)
- S Fokstuen
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - P Makrythanasis
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.,Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland
| | - E Hammar
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - M Guipponi
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.,Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland
| | - E Ranza
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - K Varvagiannis
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.,Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland
| | - F A Santoni
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.,Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland
| | - M Albarca-Aguilera
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - M E Poleggi
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - F Couchepin
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - C Brockmann
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - A Mauron
- Institute for Ethics, History, and the Humanities, Geneva University Medical School, Geneva, Switzerland
| | - S A Hurst
- Institute for Ethics, History, and the Humanities, Geneva University Medical School, Geneva, Switzerland
| | - C Moret
- Institute for Ethics, History, and the Humanities, Geneva University Medical School, Geneva, Switzerland
| | - C Gehrig
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - A Vannier
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - J Bevillard
- Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland
| | - T Araud
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - S Gimelli
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - E Stathaki
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - A Paoloni-Giacobino
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - A Bottani
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - F Sloan-Béna
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - L D'Amato Sizonenko
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - M Mostafavi
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - H Hamamy
- Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland
| | - T Nouspikel
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - J L Blouin
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - S E Antonarakis
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland. .,Department of Genetic Medicine and Development, University of Geneva, 1 rue Michel-Servet, 1211, Geneva, Switzerland. .,iGE3, Institute of Genetics and Genomics of Geneva, Geneva, Switzerland.
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Latus A, Alam MS, Mostafavi M, Marignier JL, Maisonhaute E. Guanosine radical reactivity explored by pulse radiolysis coupled with transient electrochemistry. Chem Commun (Camb) 2016; 51:9089-92. [PMID: 25900346 DOI: 10.1039/c5cc02211h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We follow the reactivity of a guanosine radical created by a radiolytic electron pulse both by spectroscopic and electrochemical methods. This original approach allows us to demonstrate that there is a competition between oxidation and reduction of these intermediates, an important result to further analyse the degradation or repair pathways of DNA bases.
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Affiliation(s)
- A Latus
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8235, Laboratoire Interfaces et Systèmes Electrochimiques, F-75005 Paris, France.
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Zhou XS, Mao BW, Amatore C, Compton RG, Marignier JL, Mostafavi M, Nierengarten JF, Maisonhaute E. Transient electrochemistry: beyond simply temporal resolution. Chem Commun (Camb) 2016; 52:251-63. [DOI: 10.1039/c5cc07953e] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [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]
Abstract
Transient electrochemistry is a powerful method to solve many physicochemical issues.
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Affiliation(s)
- X.-S. Zhou
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua
- China
| | - B.-W. Mao
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- China
| | - C. Amatore
- CNRS UMR 8640 PASTEUR
- Ecole Normale Supérieure-PSL Research University
- Département de Chimie
- Sorbonne Universités - UPMC University Paris 06
- 75005 Paris
| | - R. G. Compton
- Department of Chemistry
- Physical and Theoretical Chemistry Laboratory
- University of Oxford
- Oxford OX1 3QZ
- UK
| | - J.-L. Marignier
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- 91405 Orsay Cedex
- France
| | - M. Mostafavi
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- 91405 Orsay Cedex
- France
| | - J.-F. Nierengarten
- Laboratoire de Chimie des Matériaux Moléculaires
- Université de Strasbourg et CNRS
- Ecole Européenne de Chimie
- Polymères et Matériaux (ECPM)
- 67087 Strasbourg Cedex 2
| | - E. Maisonhaute
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8235
- Laboratoire Interfaces et Systémes Electrochimiques
- F-75005 Paris
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Behmand B, Marignier JL, Mostafavi M, Wagner JR, Hunting DJ, Sanche L. Radiosensitization of DNA by Cisplatin Adducts Results from an Increase in the Rate Constant for the Reaction with Hydrated Electrons and Formation of Pt(I). J Phys Chem B 2015; 119:9496-500. [PMID: 26098937 DOI: 10.1021/acs.jpcb.5b01752] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pulse radiolysis measurements of the decay of hydrated electrons in solutions containing different concentrations of the oligonucleotide GTG with and without a cisplatin adduct show that the presence of a cisplatin moiety accelerates the reaction between hydrated electrons and the oligonucleotide. The rate constant of the reaction is found to be 2.23 × 10(10) mol(-1) L s(-1), which indicates that it is diffusion controlled. In addition, we show for the first time the formation of a Pt(I) intermediate as a result of the reaction of hydrated electrons with GTG-cisplatin. A putative reaction mechanism is proposed, which may form the basis of the radiosensitization of cancer cells in concomitant chemoradiation therapy with cisplatin.
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Affiliation(s)
- B Behmand
- †Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - J-L Marignier
- ‡Centre de cinétique rapide ELYSE, Laboratoire de chimie physique, Université de Paris-Sud 11, 91405, Orsay, France
| | - M Mostafavi
- ‡Centre de cinétique rapide ELYSE, Laboratoire de chimie physique, Université de Paris-Sud 11, 91405, Orsay, France
| | - J R Wagner
- †Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - D J Hunting
- †Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - L Sanche
- †Groupe en sciences des radiations, Faculté de médicine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
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Abstract
It is still difficult to assess the risk originating from the radioactivity inventory remaining in the damaged Fukushima nuclear reactors. Here we show that cooling water analyses provide a means to assess source terms for potential future releases. Until now already about 34% of the inventories of (137)Cs of three reactors has been released into water. We found that the release rate of (137)Cs has been constant for 2 years at about 1.8% of the inventory per year indicating ongoing dissolution of the fuel debris. Compared to laboratory studies on spent nuclear fuel behavior in water, (137)Cs release rates are on the higher end, caused by the strong radiation field and oxidant production by water radiolysis and by impacts of accessible grain boundaries. It is concluded that radionuclide analyses in cooling water allow tracking of the conditions of the damaged fuel and the associated risks.
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Affiliation(s)
- B Grambow
- SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes 44307, France.
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Yamamoto H, Kozawa T, Tagawa S, Naito M, Marignier JL, Mostafavi M, Belloni J. Radiation-induced synthesis of metal nanoparticles in ethers THF and PGMEA. Radiat Phys Chem Oxf Engl 1993 2013. [DOI: 10.1016/j.radphyschem.2013.05.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Dey GR, El Omar AK, Jacob JA, Mostafavi M, Belloni J. Mechanism of Trivalent Gold Reduction and Reactivity of Transient Divalent and Monovalent Gold Ions Studied by Gamma and Pulse Radiolysis. J Phys Chem A 2010; 115:383-91. [DOI: 10.1021/jp1096597] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- G. R. Dey
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, and Laboratoire de Chimie Physique/ELYSE, UMR UPS-CNRS 8000, Bât. 349, Universite′ Paris-Sud, 91405, Orsay, France
| | - A. K. El Omar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, and Laboratoire de Chimie Physique/ELYSE, UMR UPS-CNRS 8000, Bât. 349, Universite′ Paris-Sud, 91405, Orsay, France
| | - J. A. Jacob
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, and Laboratoire de Chimie Physique/ELYSE, UMR UPS-CNRS 8000, Bât. 349, Universite′ Paris-Sud, 91405, Orsay, France
| | - M. Mostafavi
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, and Laboratoire de Chimie Physique/ELYSE, UMR UPS-CNRS 8000, Bât. 349, Universite′ Paris-Sud, 91405, Orsay, France
| | - J. Belloni
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India, and Laboratoire de Chimie Physique/ELYSE, UMR UPS-CNRS 8000, Bât. 349, Universite′ Paris-Sud, 91405, Orsay, France
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Knoerr R, Yordanov I, De Waele V, Mintova S, Mostafavi M. Preparation of Colloidal BEA Zeolite Functionalized with Pd Aggregates as a Precursor for Low Dimensionality Sensing Layer. ACTA ACUST UNITED AC 2010. [DOI: 10.1166/sl.2010.1301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Atinault E, De Waele V, Belloni J, Le Naour C, Fattahi M, Mostafavi M. Radiolytic Yield of UIV Oxidation into UVI: A New Mechanism for UV Reactivity in Acidic Solution. J Phys Chem A 2010; 114:2080-5. [DOI: 10.1021/jp9051177] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- E. Atinault
- Laboratoire de Chimie Physique/ELYSE, CNRS-Université Paris-Sud, Bât. 349, 91405 Orsay, France, SUBATECH, Ecole des Mines de Nantes, Université de Nantes, 44307 Nantes, France, and Institut de Physique Nucléaire, CNRS-Université Paris-Sud, Bât. 100, 91406 Orsay, France
| | - V. De Waele
- Laboratoire de Chimie Physique/ELYSE, CNRS-Université Paris-Sud, Bât. 349, 91405 Orsay, France, SUBATECH, Ecole des Mines de Nantes, Université de Nantes, 44307 Nantes, France, and Institut de Physique Nucléaire, CNRS-Université Paris-Sud, Bât. 100, 91406 Orsay, France
| | - J. Belloni
- Laboratoire de Chimie Physique/ELYSE, CNRS-Université Paris-Sud, Bât. 349, 91405 Orsay, France, SUBATECH, Ecole des Mines de Nantes, Université de Nantes, 44307 Nantes, France, and Institut de Physique Nucléaire, CNRS-Université Paris-Sud, Bât. 100, 91406 Orsay, France
| | - C. Le Naour
- Laboratoire de Chimie Physique/ELYSE, CNRS-Université Paris-Sud, Bât. 349, 91405 Orsay, France, SUBATECH, Ecole des Mines de Nantes, Université de Nantes, 44307 Nantes, France, and Institut de Physique Nucléaire, CNRS-Université Paris-Sud, Bât. 100, 91406 Orsay, France
| | - M. Fattahi
- Laboratoire de Chimie Physique/ELYSE, CNRS-Université Paris-Sud, Bât. 349, 91405 Orsay, France, SUBATECH, Ecole des Mines de Nantes, Université de Nantes, 44307 Nantes, France, and Institut de Physique Nucléaire, CNRS-Université Paris-Sud, Bât. 100, 91406 Orsay, France
| | - M. Mostafavi
- Laboratoire de Chimie Physique/ELYSE, CNRS-Université Paris-Sud, Bât. 349, 91405 Orsay, France, SUBATECH, Ecole des Mines de Nantes, Université de Nantes, 44307 Nantes, France, and Institut de Physique Nucléaire, CNRS-Université Paris-Sud, Bât. 100, 91406 Orsay, France
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Atinault E, De Waele V, Fattahi M, LaVerne JA, Pimblott SM, Mostafavi M. Aqueous solution of UCl6(2-) in O2 saturated acidic medium: an efficient system to scavenge all primary radicals in spurs produced by irradiation. J Phys Chem A 2009; 113:949-51. [PMID: 19159206 DOI: 10.1021/jp810579x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Absorbance measurements find the yield of the oxidation of U(IV) to be (8.75 +/- 0.05) x 10(-7) mol J(-1) in the (60)Co gamma radiolysis of aqueous solutions containing 4.4 x 10(-3) mol L(-1) U(IV) in the presence of O(2) saturated 2 mol L(-1) Cl(-) at pH = 0. This high value of oxidation yield suggests that all primary radicals formed by water decomposition are scavenged in these solutions. Simulations using a nonhomogeneous stochastic kinetic track model agree with the experimental results and are used to explain the mechanism for scavenging radicals and oxidation of U(IV).
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Atinault E, De Waele V, Schmidhammer U, Fattahi M, Mostafavi M. Scavenging of es− and OH radicals in concentrated HCl and NaCl aqueous solutions. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.06.048] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bonin J, Lampre I, Pernot P, Mostafavi M. Solvation dynamics of electron produced by two-photon ionization of liquid polyols. III. Glycerol. J Phys Chem A 2008; 112:1880-6. [PMID: 18266344 DOI: 10.1021/jp710203v] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The solvation dynamics of excess electrons in glycerol have been measured by the pump-probe femtosecond laser technique at 333 K. The electrons are produced by two-photon absorption at 263 nm. The change in the induced absorbance is followed up to 450 ps in the spectral range from 440 to 720 nm. The transient signals of electron solvation have been analyzed by two kinetic models: a stepwise mechanism and a continuous relaxation model, using a Bayesian data analysis method. The results are compared with those previously published for ethylene glycol (J. Phys. Chem. A 2006, 110, 175) and for propanediols (J. Phys. Chem. A 2007, 111, 4902). From the comparison, it is pointed out that solvation dynamics in glycerol is very fast despite its high viscosity. This is interpreted as the existence of efficient traps for the electrons in glycerol with low potential energy. The small shift of the absorption band of the excess electron indicates that the potential of these traps is very close to that corresponding to the fully solvated electron.
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Affiliation(s)
- J Bonin
- Laboratoire de Chimie Physique/ELYSE, Université Paris-Sud 11, UMR 8000, Bât. 349, Orsay, F-91405, France, and CNRS, Orsay, F-91405, France
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Soroushian B, Lampre I, Bonin J, Pernot P, Pommeret S, Mostafavi M. Solvation dynamics of the electron produced by two-photon ionization of liquid polyols. 1. Ethylene glycol. J Phys Chem A 2007; 110:1705-17. [PMID: 16450999 DOI: 10.1021/jp0540149] [Citation(s) in RCA: 24] [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: 11/29/2022]
Abstract
Solvated electrons have been produced in ethylene glycol by two-photon ionization of the solvent with 263 nm femtosecond laser pulses. The two-photon absorption coefficient of ethylene glycol at 263 nm is determined to be beta = (2.1 +/- 0.2) x 10(-11) m W(-1). The dynamics of electron solvation in ethylene glycol has been studied by pump-probe transient absorption spectroscopy. So, time-resolved absorption spectra ranging from 430 to 710 nm have been measured. A blue shift of the spectra is observed for the first tens of picoseconds. Using the Bayesian data analysis method, the observed solvation dynamics are reconstructed with different models: stepwise mechanisms, continuous relaxation models, or combinations of stepwise and continuous relaxation. Comparison between models is in favor of continuous relaxation, which is mainly governed by solvent molecular motions.
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Affiliation(s)
- B Soroushian
- Laboratoire de Chimie Physique/ELYSE, UMR 8000 CNRS/Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
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Bonin J, Lampre I, Pernot P, Mostafavi M. Solvation dynamics of electron produced by two-photon ionization of liquid polyols. II. Propanediols. J Phys Chem A 2007; 111:4902-13. [PMID: 17511428 DOI: 10.1021/jp068323q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Temporal evolution of transient absorption spectra of electrons produced by two-photon ionization of two isomers, propane-1,2-diol (12PD) and propane-1,3-diol (13PD), with 263 nm femtosecond laser pulses has been studied on picosecond time scale. The two-photon absorption coefficients of 12PD and 13PD at 263 nm were determined to be beta = (2.0 +/- 0.3) x 10(-11) and (2.4 +/- 0.3) x 10(-11) m W(-1), respectively. Time-resolved absorption spectra ranging from 440 to 720 nm have been measured, showing a blue shift for the first tens of picoseconds for both solvents. However, the observed solvation dynamics of electron appears faster in 13PD than in 12PD. The transient signals of electron solvation have then been reconstructed with different models (stepwise mechanism or continuous relaxation model) using a Bayesian data analysis method. Results are discussed, compared with those previously obtained in ethylene glycol (J. Phys. Chem. A 2006, 110, 1705) and corroborate the interpretation, according to which the solvation of electrons is mainly governed by continuous solvent molecular motions.
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Affiliation(s)
- J Bonin
- Laboratoire de Chimie Physique/ELYSE, Univ Paris-Sud, UMR 8000, Bât. 349, Orsay, France 91405, and CNRS, Orsay, France 91405
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Baldacchino G, De Waele V, Monard H, Sorgues S, Gobert F, Larbre J, Vigneron G, Marignier J, Pommeret S, Mostafavi M. Hydrated electron decay measurements with picosecond pulse radiolysis at elevated temperatures up to 350°C. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.04.061] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Remita H, Lampre I, Mostafavi M, Balanzat E, Bouffard S. Comparative study of metal clusters induced in aqueous solutions by γ-rays, electron or C6+ ion beam irradiation. Radiat Phys Chem Oxf Engl 1993 2005. [DOI: 10.1016/j.radphyschem.2004.03.042] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Renou F, Archirel P, Pernot P, Lévy B, Mostafavi M. Pulse Radiolysis Study of Solvated Electron Pairing with Alkaline Earth Metals in Tetrahydrofuran. 3. Splitting of p-Like Excited States of Solvated Electron Perturbed by Metal Cations. J Phys Chem A 2004. [DOI: 10.1021/jp035899w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- F. Renou
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - P. Archirel
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - P. Pernot
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - B. Lévy
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - M. Mostafavi
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
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Mostafavi M, Lin M, He H, Muroya Y, Katsumura Y. Temperature-dependent absorption spectra of the solvated electron in ethylene glycol at 100 atm studied by pulse radiolysis from 296 to 598 K. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.12.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Renou F, Pernot P, Bonin J, Lampre I, Mostafavi M. Solvated Electron Pairing with Earth Alkaline Metals in THF 2Reactivity of the (MgII, es-) Pair with Aromatic and Halogenated Hydrocarbon Compounds. J Phys Chem A 2003. [DOI: 10.1021/jp034290s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- F. Renou
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - P. Pernot
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - J. Bonin
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - I. Lampre
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
| | - M. Mostafavi
- Laboratoire de Chimie Physique, CNRS UMR 8000, Université Paris-Sud, Centre d'Orsay, Bât. 349, 91405 Orsay Cedex, France
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Renou F, Mostafavi M, Archirel P, Bonazzola L, Pernot P. Solvated Electron Pairing with Earth Alkaline Metals in THF. 1. Formation and Structure of the Pair with Divalent Magnesium. J Phys Chem A 2003. [DOI: 10.1021/jp0216124] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- M. Mostafavi
- Laboratoire de Chimie Physique, UMR CNRS-UPS 8000, Bât. 349, Université Paris-Sud, 91405, Orsay, France
| | - G. R. Dey
- Laboratoire de Chimie Physique, UMR CNRS-UPS 8000, Bât. 349, Université Paris-Sud, 91405, Orsay, France
| | - L. François
- Laboratoire de Chimie Physique, UMR CNRS-UPS 8000, Bât. 349, Université Paris-Sud, 91405, Orsay, France
| | - J. Belloni
- Laboratoire de Chimie Physique, UMR CNRS-UPS 8000, Bât. 349, Université Paris-Sud, 91405, Orsay, France
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Affiliation(s)
- S. Pommeret
- CEA/Saclay, DSM/DRECAM/SCM URA 331 CNRS, 91191 Gif-sur-Yvette Cédex, France, and Laboratoire de Chimie Physique UMR 8000, CNRS/Université Paris-Sud, Centre d'Orsay, Bâtiment 349, 91405 Orsay Cedex, France
| | - F. Gobert
- CEA/Saclay, DSM/DRECAM/SCM URA 331 CNRS, 91191 Gif-sur-Yvette Cédex, France, and Laboratoire de Chimie Physique UMR 8000, CNRS/Université Paris-Sud, Centre d'Orsay, Bâtiment 349, 91405 Orsay Cedex, France
| | - M. Mostafavi
- CEA/Saclay, DSM/DRECAM/SCM URA 331 CNRS, 91191 Gif-sur-Yvette Cédex, France, and Laboratoire de Chimie Physique UMR 8000, CNRS/Université Paris-Sud, Centre d'Orsay, Bâtiment 349, 91405 Orsay Cedex, France
| | - I. Lampre
- CEA/Saclay, DSM/DRECAM/SCM URA 331 CNRS, 91191 Gif-sur-Yvette Cédex, France, and Laboratoire de Chimie Physique UMR 8000, CNRS/Université Paris-Sud, Centre d'Orsay, Bâtiment 349, 91405 Orsay Cedex, France
| | - J.-C. Mialocq
- CEA/Saclay, DSM/DRECAM/SCM URA 331 CNRS, 91191 Gif-sur-Yvette Cédex, France, and Laboratoire de Chimie Physique UMR 8000, CNRS/Université Paris-Sud, Centre d'Orsay, Bâtiment 349, 91405 Orsay Cedex, France
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Gobert F, Pommeret S, Vigneron G, Buguet S, Haidar R, Mialocq JC, Lampre I, Mostafavi M. Nanosecond kinetics of hydrated electrons upon water photolysis by high intensity femtosecond UV pulses. Res Chem Intermed 2001. [DOI: 10.1163/15685670152622167] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Remita S, Picq G, Khatouri J, Mostafavi M. Radiolytic formation of bilayered Ptcore/Aushell and Aucore/Ptshell clusters in aqueous solution. Radiat Phys Chem Oxf Engl 1993 1999. [DOI: 10.1016/s0969-806x(98)00283-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Treguer M, de Cointet C, Remita H, Khatouri J, Mostafavi M, Amblard J, Belloni J, de Keyzer R. Dose Rate Effects on Radiolytic Synthesis of Gold−Silver Bimetallic Clusters in Solution. J Phys Chem B 1998. [DOI: 10.1021/jp981467n] [Citation(s) in RCA: 233] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Treguer
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
| | - C. de Cointet
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
| | - H. Remita
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
| | - J. Khatouri
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
| | - M. Mostafavi
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
| | - J. Amblard
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
| | - J. Belloni
- Laboratoire de Physico-Chimie des Rayonnements (Associé au CNRS), Université Paris-Sud, 91405 Orsay Cedex, France
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Abstract
We report a case of a large perforated adenocarcinoma of the rectum manifesting as an ischiorectal abscess progressing to Fournier's gangrene in an insulin-dependent diabetic man. Recognition and management of this rare syndrome in the setting of a common disease is discussed.
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Affiliation(s)
- R A Gamagami
- Department of Surgery, University of California, San Diego, USA
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Affiliation(s)
- C. de Cointet
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350, Université Paris-Sud, 91405 Orsay, France
| | - J. Khatouri
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350, Université Paris-Sud, 91405 Orsay, France
| | - M. Mostafavi
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350, Université Paris-Sud, 91405 Orsay, France
| | - J. Belloni
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350, Université Paris-Sud, 91405 Orsay, France
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Affiliation(s)
- C. de Cointet
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350 Université Paris-Sud, 91405 Orsay, France
| | - M. Mostafavi
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350 Université Paris-Sud, 91405 Orsay, France
| | - J. Khatouri
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350 Université Paris-Sud, 91405 Orsay, France
| | - J. Belloni
- Laboratoire de Physico-Chimie des Rayonnements, Associé au CNRS, Bâtiment 350 Université Paris-Sud, 91405 Orsay, France
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Rémita S, Mostafavi M, Delcourt MO. EDTA and CN- Complexing Effect on the Kinetics, Spectral Properties, and Redox Properties of Ag10 and Ag2+ in Aqueous Solution. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp960176g] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Rémita
- Laboratoire de Physico-Chimie des Rayonnements, CNRS (URA 75), Université Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France
| | - M. Mostafavi
- Laboratoire de Physico-Chimie des Rayonnements, CNRS (URA 75), Université Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France
| | - M. O. Delcourt
- Laboratoire de Physico-Chimie des Rayonnements, CNRS (URA 75), Université Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France
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Mostafavi M, Stein PC, Parsons CL. Production of soluble virulence factor by Escherichia coli. J Urol 1995; 153:1441-3. [PMID: 7714961] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Experimental evidence suggests that adherence is a prerequisite for bacterial infection. We demonstrated that transitional cells at the surface of the bladder are coated with glycosaminoglycans (proteoglycans and mucus) whose presence efficiently decreases bacterial adherence to the mucosa. Exposure of mucus to protamine sulfate, a quaternary amine (known to form salts with glycosaminoglycans and inactivate them) significantly increases the bacterial adherence to the bladder. Investigators have primarily focused on bacterial surface factors (that is pili or fimbriae, glycocalix) in relation to the ability to adhere. We explored the hypothesis that Escherichia coli produces a soluble virulence factor that increases the infection rate in rabbits by promoting bacterial adherence to the bladder mucosa. In addition, it was proposed that this factor is a quaternary amine similar to protamine. For these studies an in vivo bacterial infection assay (which we described previously in rabbits) was used to examine E. coli metabolic products (soluble virulence factor) that could promote bacterial persistence in the bladder by perturbing mucus (glycosaminoglycans), and promote bacterial adherence and virulence. E. coli was grown in human urine and a bacterial-free supernatant was collected. Rabbit bladders were then exposed to either this supernatant or to the same human urine that was not infected with E. coli. Results show a significantly higher bacterial persistence (bacterial count) in bladders pretreated with urine containing the E. coli supernatants compared to controls pretreated with uninfected urine (p = 0.03). The molecular weight of the putative soluble virulence factor is less than 3.5 kD. (p = 0.056) based on dialysis studies and binds to heparin agarose affinity chromatography matrix, suggesting that it is cationic and capable of adhering to the highly anionic bladder mucus (glycosaminoglycans).
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Affiliation(s)
- M Mostafavi
- Division of Urology, University of California, San Diego Medical Center, USA
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Khatouri J, Ridard J, Mostafavi M, Amblard J, Belloni J. Kinetics of cluster aggregation in competition with a chemical growth reaction. ACTA ACUST UNITED AC 1995. [DOI: 10.1007/bf01443737] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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