1
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Rodríguez-Fernández A, Bonnet L, Larrégaray P, Díez Muiño R. How Adsorbed Oxygen Atoms Inhibit Hydrogen Dissociation on Tungsten Surfaces. J Phys Chem Lett 2023; 14:1246-1252. [PMID: 36718641 PMCID: PMC9923735 DOI: 10.1021/acs.jpclett.2c03684] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
Hydrogen molecules dissociate on clean W(110) surfaces. This reaction is progressively inhibited as the tungsten surface is precovered with oxygen. We use density functional theory and ab initio molecular dynamics to rationalize, at the atomic scale, the influence of the adsorbed O atoms on the H2 dissociation process. The reaction probability is calculated for kinetic energies below 300 meV and different O nominal coverages. We show that the adsorbed O atoms act as repulsive centers that modulate the dynamics of the impinging H2 molecules by closing dissociation pathways. In agreement with existing experimental information, H2 dissociation is absent for an O coverage of half a monolayer. The results show that the influence of O adsorbates on the dissociation dynamics on W(110) goes much beyond the blocking of possible H adsorption sites. Adsorbed O atoms create a sort of chemical shield at the surface that prevents further approach and dissociation of the H2 molecules.
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Affiliation(s)
- A. Rodríguez-Fernández
- Université
de Bordeaux, ISM, UMR 5255, F-33400 Talence, France
- Centro
de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
| | - L. Bonnet
- Université
de Bordeaux, ISM, UMR 5255, F-33400 Talence, France
- CNRS,
ISM, UMR 5255, F-33400 Talence, France
| | - P. Larrégaray
- Université
de Bordeaux, ISM, UMR 5255, F-33400 Talence, France
- CNRS,
ISM, UMR 5255, F-33400 Talence, France
| | - R. Díez Muiño
- Centro
de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
- Donostia
International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
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2
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Bonnet L, Crespos C, Monnerville M. Chemical reaction thresholds according to classical-limit quantum dynamics. J Chem Phys 2022; 157:094114. [PMID: 36075739 DOI: 10.1063/5.0101311] [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: 11/15/2022] Open
Abstract
Classical-limit quantum dynamics is used to explain the origin of the quantum thresholds of chemical reactions from their classical dynamics when these are vibrationally nonadiabatic across the interaction region. This study is performed within the framework of an elementary model of chemical reaction that mimics the passage from the free rotation of the reagents to the bending vibration at the transition state to the free rotation of the products.
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Affiliation(s)
- L Bonnet
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - C Crespos
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - M Monnerville
- Univ. Lille, CNRS, PhLAM, UMR 8523, 59655 Villeneuve d'Ascq, France
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3
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Dillmann M, Bonnet L, Vuillier F, Moulin T, Biondi A, Charbonnier G. Factors That Influence Susceptibility Vessel Sign in Patients With Acute Stroke Referred for Mechanical Thrombectomy. Front Neurol 2022; 13:893060. [PMID: 35645960 PMCID: PMC9130602 DOI: 10.3389/fneur.2022.893060] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 04/14/2022] [Indexed: 11/23/2022] Open
Abstract
Background and Purpose The presence of a Susceptibility Vessel Sign (SVS) in the acute phase of proximal occlusion ischemic stroke indicates the presence of deoxyhemoglobin in the thrombus. Thrombi composition changes over time. The aim of this study was to investigate whether the absence of SVS is associated with a shorter symptom onset to imaging time. Methods We retrospectively analyzed all patients referred for mechanical thrombectomy at Besançon University Hospital between 1 January 2015 and 31 December 2020 for whom readable T2*-weighted imaging was available. We compared patient characteristics according to the presence or absence of an SVS. We also studied the subgroup for whom the exact symptom onset time was known. We performed a univariate statistical analysis, then a multivariate analysis on the variables that were statistically significant in the univariate analysis. Results Of the 389 patients included, 309 (79.4%) were SVS+. We found no significant relationship between SVS– and the time between symptom onset and imaging in the whole cohort. In the multivariate analysis, SVS– was associated with anticoagulant treatment (p < 0.01), and SVS+ with age (p = 0.023) and carotid terminus occlusion (p = 0.042). In the known symptom onset subgroup, SVS– was significantly associated with a shorter symptom onset -imaging time (p < 0.001), and this was confirmed in the multivariate analysis (p = 0.011; OR 0.911; 95% CI [0.844; 0.972]). Conclusion In the acute phase of proximal occlusion ischemic stroke, absence of SVS was associated with a shorter symptom onset–imaging time for patients with a known symptom onset time.
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Affiliation(s)
- Manon Dillmann
- Neurology Department, University Hospital Centre Besancon, Besançon, France
- *Correspondence: Manon Dillmann
| | - Louise Bonnet
- Neurology Department, University Hospital Centre Besancon, Besançon, France
| | - Fabrice Vuillier
- Neurology Department, University Hospital Centre Besancon, Besançon, France
- Laboratoire de Recherches Intégratives en Neurosciences et Psychologie Cognitive - UR 481, Université de Franche-Comte UFR Sciences Médicales et Pharmaceutiques, Besançon, France
| | - Thierry Moulin
- Neurology Department, University Hospital Centre Besancon, Besançon, France
- Laboratoire de Recherches Intégratives en Neurosciences et Psychologie Cognitive - UR 481, Université de Franche-Comte UFR Sciences Médicales et Pharmaceutiques, Besançon, France
| | - Alessandra Biondi
- Laboratoire de Recherches Intégratives en Neurosciences et Psychologie Cognitive - UR 481, Université de Franche-Comte UFR Sciences Médicales et Pharmaceutiques, Besançon, France
- Interventional Neuroradiology Department, University Hospital Centre Besancon, Besançon, France
| | - Guillaume Charbonnier
- Laboratoire de Recherches Intégratives en Neurosciences et Psychologie Cognitive - UR 481, Université de Franche-Comte UFR Sciences Médicales et Pharmaceutiques, Besançon, France
- Interventional Neuroradiology Department, University Hospital Centre Besancon, Besançon, France
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4
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Best K, Alderson S, Alldred D, Bonnet L, Buchan I, Butters O, Farrin A, Foy R, Johnson O, McInerney C, Mehdizadeh D, Lawton T, Lawton R, Rodgers S, Teale E, Walker L, West R, Young B, Pirmohamed M, Clegg A. 825 DEVELOPMENT OF THE ANTICHOLINERGIC MEDICATION INDEX (ACMI). Age Ageing 2022. [DOI: 10.1093/ageing/afac035.825] [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: 11/12/2022] Open
Abstract
Abstract
Introduction
Medications with Anticholinergic (AC) properties, are prescribed to treat a range of conditions. Older people are increasingly likely to be prescribed multiple AC medications, but are also more likely to experience unwanted adverse effects, such as falls and delirium. The risks of adverse outcomes increase with the number and potency of AC medications prescribed. The aim of this study was to use a prognostic modelling approach to develop an AC Medication Index (ACMI) that identifies patients at high risk of AC medication side effects.
Methods
The prognostic model was developed using data on patients aged 65–95 years, registered with a general practice contributing data to ‘Connected Bradford’ in 2019. A Time-dependent Cox model was fitted, with hospital admission for delirium or falls as the composite outcome and AC medications, age, sex and important clinical factors (e.g. dementia, arthritis, urinary incontinence) as predictors. Concordance and Negalkerke’s R2 derived from five-fold cross-validation were used to assess model performance.
Results
There were 151,604 patients included in the study, of whom 47,035 (31.0%) were prescribed ≥1 AC medication during 2019. Codeine, Prednisolone, Furosemide and Amitriptyline were most commonly prescribed with 7.4%, 4.0%, 3.8% and 3.1% of patients prescribed these medications at least once in 2019, respectively. During 2019, 6,078 (4.0%) patients experienced a hospital admission with delirium or a fall, with the rate being increased in those prescribed ≥1 AC medication during 2019 (4.8% vs 3.7%; p < 0.001). The prognostic model yielded a discrimination statistic of 0.86 with an R2 of 0.1.
Conclusion
The model used to develop the ACMI shows good discrimination. External validation will soon be performed using data from the SAIL databank and the ACMI will be further developed as a tool for use in primary care.
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Affiliation(s)
| | - S Alderson
- University of Leeds
- NHS Greater Huddersfield CCG
| | | | | | | | | | | | | | | | | | | | - T Lawton
- Bradford Teaching Hospitals NHS Foundation Trust
| | | | | | - E Teale
- University of Leeds
- Bradford Teaching Hospitals NHS Foundation Trust
| | | | | | | | | | - A Clegg
- University of Leeds
- Bradford Teaching Hospitals NHS Foundation Trust
- NHS Leeds CCG
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5
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Bonnet L. Erratum: "Semiclassical initial value representation: From Møller to Miller" [J. Chem. Phys. 153, 174102 (2020)]. J Chem Phys 2021; 155:059901. [PMID: 34364332 DOI: 10.1063/5.0063094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- L Bonnet
- CNRS, ISM, UMR 5255, F-33400 Talence, France
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6
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Charbonnier G, Bonnet L, Biondi A, Moulin T. Intracranial Bleeding After Reperfusion Therapy in Acute Ischemic Stroke. Front Neurol 2021; 11:629920. [PMID: 33633661 PMCID: PMC7900408 DOI: 10.3389/fneur.2020.629920] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 12/29/2020] [Indexed: 12/16/2022] Open
Abstract
Intracranial hemorrhage is one of the most feared complications following brain infarct. Ischemic tissues have a natural tendency to bleed. Moreover, the first recanalization trials using intravenous thrombolysis have shown an increase in mild to severe intracranial hemorrhage. Symptomatic intracerebral hemorrhage is strongly associated with poor outcomes and is an important factor in recanalization decisions. Stroke physicians have to weigh the potential benefit of recanalization therapies, first, with different risks of intracranial hemorrhage described in randomized controlled trials, and second with numerous risk markers that have been found to be associated with intracranial hemorrhage in retrospective series. These decisions have become quite complex with different intravenous thrombolytics and mechanical thrombectomy. This review aims to outline some elements of the pathophysiological mechanisms and classifications, describe most of the risk factors identified for each reperfusion therapy, and finally suggest future research directions that could help physicians dealing with these complications.
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Affiliation(s)
- Guillaume Charbonnier
- Neurology Department, Besançon University Hospital, Besançon, France.,Interventional Neuroradiology Department, Besançon University Hospital, Besançon, France.,EA 481 Neurosciences laboratory, Franche-Comté University, Besançon, France
| | - Louise Bonnet
- Neurology Department, Besançon University Hospital, Besançon, France
| | - Alessandra Biondi
- Interventional Neuroradiology Department, Besançon University Hospital, Besançon, France.,CIC-1431 Inserm, Besançon, France
| | - Thierry Moulin
- Neurology Department, Besançon University Hospital, Besançon, France.,EA 481 Neurosciences laboratory, Franche-Comté University, Besançon, France.,CIC-1431 Inserm, Besançon, France
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7
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Charbonnier G, Bonnet L, Bouamra B, Vuillier F, Vitale G, Moulin T, Medeiros De Bustos E, Biondi A. Does Intravenous Thrombolysis Influence the Time of Recanalization and Success of Mechanical Thrombectomy during the Acute Phase of Cerebral Infarction? Cerebrovasc Dis Extra 2020; 10:28-35. [PMID: 32344411 PMCID: PMC7289153 DOI: 10.1159/000507119] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 02/26/2020] [Indexed: 11/19/2022] Open
Abstract
Objectives Mechanical thrombectomy (MT) is an effective treatment for acute ischemic stroke (AIS) caused by large vessel occlusion. Recanalization time is a key factor in the treatment of AIS. It has previously been suggested that intravenous thrombolysis (IVT) may be associated with a shorter recanalization time. The aim of our study was to investigate whether IVT or other factors could be associated with shorter or longer MT procedure times. Methods We performed a retrospective analysis of a local cohort of patients treated by MT. We collected procedure time (puncture to recanalization and clot visualization to recanalization), demographic data, localization of the thrombus, antithrombotic treatment at arrival, IVT infusion, and stroke subtype at discharge according to the TOAST classification. We planned to analyze the full cohort and the successful revascularization subgroup. Results There was no difference in procedure times between patients who received IVT and those who did not. In the successful revascularization subgroup, patients presenting with cardioembolic stroke had a significantly shorter time between clot visualizations and revascularization than the other patients (41 vs. 56 min, p = 0.024), but this was not the case in the full cohort. Also in the successful revascularization subgroup, the revascularization time was 76 vs. 61 min (p = 0.075) in patients presenting with tandem occlusion vs. the others, but there was no difference between these groups in the full cohort. Conclusions There was no difference in terms of procedure times in patients treated by IVT and MT vs. patients treated by MT alone either in the full cohort or in the successful revascularization subgroup. The data from the successful revascularization subgroup may be useful for studying revascularization times, provided that data from procedures that were stopped prematurely by the operator due to the length of time since symptom onset is removed.
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Affiliation(s)
- Guillaume Charbonnier
- Neurology department, Besançon University Hospital, Besançon, France, .,Interventional Neuroradiology department, Besançon University Hospital, Besançon, France,
| | - Louise Bonnet
- Neurology department, Besançon University Hospital, Besançon, France
| | - Benjamin Bouamra
- Neurology department, Besançon University Hospital, Besançon, France
| | - Fabrice Vuillier
- Neurology department, Besançon University Hospital, Besançon, France
| | - Giovanni Vitale
- Interventional Neuroradiology department, Besançon University Hospital, Besançon, France
| | - Thierry Moulin
- Neurology department, Besançon University Hospital, Besançon, France
| | | | - Alessandra Biondi
- Interventional Neuroradiology department, Besançon University Hospital, Besançon, France
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8
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Bonnet L, Larregaray P. Statistical properties of quantum probability fluctuations in complex-forming chemical reactions. J Chem Phys 2020; 152:084117. [DOI: 10.1063/1.5139207] [Citation(s) in RCA: 4] [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: 11/14/2022] Open
Affiliation(s)
- L. Bonnet
- Université de Bordeaux, ISM, UMR 5255, F-33400 Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - P. Larregaray
- Université de Bordeaux, ISM, UMR 5255, F-33400 Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
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9
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Cheng B, Boutitie F, Nickel A, Wouters A, Cho TH, Ebinger M, Endres M, Fiebach JB, Fiehler J, Galinovic I, Puig J, Thijs V, Lemmens R, Muir KW, Nighoghossian N, Pedraza S, Simonsen CZ, Gerloff C, Thomalla G, Golsari A, Alegiani A, Beck C, Choe CU, Voget D, Hoppe J, Schröder J, Rozanski M, Nave AH, Wollboldt C, van Sloten I, Göhler J, Herm J, Jungehülsing J, Lückl J, Kröber JM, Schurig J, Koehler L, Schlemm L, Knops M, Roennefarth M, Ipsen N, Harmel P, Bathe-Peters R, Fleischmann R, Ganeshan R, Geran R, Hellwig S, Schmidt S, Tütüncü S, Krause T, Gramse V, Röther J, Michels P, Michalski D, Pelz J, Schulz A, Hobohm C, Weise C, Weise G, Orthgieß J, Pomrehn K, Wegscheider M, Mueller AK, Hennerici M, Griebe M, Alonso A, Filipov A, Marzina A, Anders B, Bähr C, Hoyer C, Schwarzbach C, Weber C, Hornberger E, Pledl HW, Klockziem M, Stuermlinger M, Wittayer M, Wolf M, Meyer N, Eisele P, Steinert S, Sauer T, Held V, Ringleb P, Nagel S, Veltkamp R, Schwarting S, Schwarz A, Gumbinger C, Hametner C, Amiri H, Purrucker J, Ciatipis M, Menn O, Mundiyanapurath S, Schieber S, Kessler T, Reiff T, Panitz V, Singer O, Foerch C, Lauer A, Männer A, Seiler A, Guerzoglu D, Schäfer JH, Filipski K, Lorenz M, Kurka N, Zeiner P, Pfeilschifter W, Dziewas R, Minnerup J, Albiker C, Ritter M, Seidel M, Dittrich R, Kallmünzer B, Bobinger T, Madzar D, Stark D, Sembill J, Macha K, Winder K, Breuer L, Koehrmann M, Spruegel M, Gerner S, Kraft P, Mackenrodt D, Kleinschnitz C, Elhfnawy A, Heinen F, Gunreben I, Poli S, Ziemann U, Gaenslen A, Schlak D, Haertig F, Russo F, Richter H, Ebner M, Ribitsch M, Wolf M, Weimar C, Zegarac V, Chen HC, Althaus K, Neugebauer H, Jüttler E, Meier J, Stösser S, Puetz V, Bodechtel U, Ostergaard L, Møller A, Damgaard D, Dupont KH, Poulsen M, Hjort N, de Morales NR, von Weitzel P, Harbo T, Marstrand J, Hansen A, Christensen H, Aegidius K, Jeppesen L, Meden P, Rosenbaum S, Iversen H, Hansen J, Michelsen L, Truelsen T, Modrau B, Vestergaard K, Oppel L, Sygehus A, Aalborg S, Swinnen B, Smets I, Demeestere J, Dobbels L, Brouns R, De Smedt A, DeKeyser J, Yperzeele L, Van Hooff RJ, Peeters A, Dusart A, Etexberria A, Hanseeuw B, London F, Leempoel J, Hohenbichler K, Younan N, Maqueda V, Laloux P, De Coene B, De Maeseneire C, Turine G, Vandermeeren Y, De Klippel N, Willems C, de Hollander I, Soors P, Hermans S, Hemelsoet D, Desfontaines P, Vanacker P, Rutgers M, Druart C, Peeters D, Bruneel B, Vancaester E, Vanhee F, Meersman G, Bourgeois P, Vanderdonckt P, Benoit A, Derex L, Mechthouff L, Berhoune N, Ritzenthaler T, Amarenco P, Hobeanu C, Gancedo EM, Calvet D, Ladoux A, Machet A, Lamy C, Mellerio C, Oppenheim C, Rodriguez-Regent C, Bodiguel E, Turc G, Birchenall J, Legrand L, Morin L, Edjali-Goujon M, Naggara O, Raphaelle S, Godon-Hardy S, Domigo V, Guiraud V, Samson Y, Leger A, Rosso C, Baronnet-Chauvet F, Crozier S, Deltour S, Yger M, Sibon I, Renou P, Sagnier S, Zuber M, Tamazyan R, Rodier G, Morel N, Felix S, Vadot W, Wolff V, Aniculaesei A, Yalo B, Bindila D, Quenardelle V, Blanc-Lasserre K, Landrault E, Breynaert L, Cakmak S, Peysson S, Viguier A, Lebely C, Raposo N, Vallet AE, Vallet P, Brugirard S, Cheripelli B, Kalladka D, Moreton F, Dani K, Tawil SE, Ramachandran S, Huang X, Warburton E, Evans N, Perry R, Patel B, Cloud G, Pereira A, Moynihan B, Lovelock C, Choy L, Khan U, Roffe C, Tyrell P, Smith C, Dixit A, Louw S, Broughton D, Shetty A, Appleton J, Sprigg N, Acosta BR, van Eendenburg C, Leal JS, Mar Castellanos Rodrigo MD, Izaga MT, Guillamon OB, Arenillas J, Calleja A, Cortijo E, Mulero P, de la Ossa NP, Garrido A, Martinez A, Esperón CG, Guerrero C, Carrera D, Vilas D, Lopez-cancio E, Palomeras E, Lucente G, Gomis M, Isern I, Becerra JL, Vicente JH, Sánchez J, Dorado L, Grau L, Ispierto L, Prats L, Almendrote M, Hernández M, Jimenez M, Sánchez ML, Torne MM, Presas S, Ustrell X, Pellisé A, Navalpotro I, Luna A, Schonewille W, Nederkoorn P, Majoie C, van den Berg L, van den Berg S, Zonneveld T, Remmers M, Fazekas F, Pichler A, Fandler S, Gattringer T, Mutzenbach J, Weber J, Höfner E, Kohlfürst H, Weinstich K, Kellert L, Bayer-Karpinska A, Opherk C, Wollenweber F, Klein M, Neumann- Haefelin T, Pierskalla A, Harloff A, Bardutzky J, Buggle F, von Schrader J, Kollmar R, Schill J, Löbbe AM, Moulin T, Bouamra B, Bonnet L, Touzé E, Bonnet AL, Touze E, Cogez J, Li L, Guettier S, Kar A, Sivagnanaratham A, Geraghty O, Bojaryn U, Nallasivan A, Gonzales MB, Rodríguez-Yáñez M, Tembl J, Gorriz D, Oberndorfer S, Prohaska E. Quantitative Signal Intensity in Fluid-Attenuated Inversion Recovery and Treatment Effect in the WAKE-UP Trial. Stroke 2020; 51:209-215. [DOI: 10.1161/strokeaha.119.027390] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background and Purpose—
Relative signal intensity of acute ischemic stroke lesions in fluid-attenuated inversion recovery (fluid-attenuated inversion recovery relative signal intensity [FLAIR-rSI]) magnetic resonance imaging is associated with time elapsed since stroke onset with higher intensities signifying longer time intervals. In the randomized controlled WAKE-UP trial (Efficacy and Safety of MRI-Based Thrombolysis in Wake-Up Stroke Trial), intravenous alteplase was effective in patients with unknown onset stroke selected by visual assessment of diffusion weighted imaging fluid-attenuated inversion recovery mismatch, that is, in those with no marked fluid-attenuated inversion recovery hyperintensity in the region of the acute diffusion weighted imaging lesion. In this post hoc analysis, we investigated whether quantitatively measured FLAIR-rSI modifies treatment effect of intravenous alteplase.
Methods—
FLAIR-rSI of stroke lesions was measured relative to signal intensity in a mirrored region in the contralesional hemisphere. The relationship between FLAIR-rSI and treatment effect on functional outcome assessed by the modified Rankin Scale (mRS) after 90 days was analyzed by binary logistic regression using different end points, that is, favorable outcome defined as mRS score of 0 to 1, independent outcome defined as mRS score of 0 to 2, ordinal analysis of mRS scores (shift analysis). All models were adjusted for National Institutes of Health Stroke Scale at symptom onset and stroke lesion volume.
Results—
FLAIR-rSI was successfully quantified in stroke lesions in 433 patients (86% of 503 patients included in WAKE-UP). Mean FLAIR-rSI was 1.06 (SD, 0.09). Interaction of FLAIR-rSI and treatment effect was not significant for mRS score of 0 to 1 (
P
=0.169) and shift analysis (
P
=0.086) but reached significance for mRS score of 0 to 2 (
P
=0.004). We observed a smooth continuing trend of decreasing treatment effects in relation to clinical end points with increasing FLAIR-rSI.
Conclusions—
In patients in whom no marked parenchymal fluid-attenuated inversion recovery hyperintensity was detected by visual judgement in the WAKE-UP trial, higher FLAIR-rSI of diffusion weighted imaging lesions was associated with decreased treatment effects of intravenous thrombolysis. This parallels the known association of treatment effect and elapsing time of stroke onset.
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Affiliation(s)
- Bastian Cheng
- From the Klinik und Poliklinik für Neurologie, Kopf- und Neurozentrum (B.C., A.N., C.G., G.T.), University Medical Center Hamburg-Eppendorf, Germany
| | - Florent Boutitie
- Service de Biostatistique, Hospices Civils de Lyon, France (F.B.)
- Université Lyon 1, Villeurbanne, France (F.B.)
- CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Equipe Biostatistique-Santé, Villeurbanne, France (F.B.)
| | - Alina Nickel
- From the Klinik und Poliklinik für Neurologie, Kopf- und Neurozentrum (B.C., A.N., C.G., G.T.), University Medical Center Hamburg-Eppendorf, Germany
| | - Anke Wouters
- Department of Neurology, University Hospitals Leuven, Belgium (A.W., R.L.)
- Department of Neurosciences, Experimental Neurology, KU Leuven–University of Leuven, Belgium (A.W., R.L.)
- VIB, Center for Brain and Disease Research, Laboratory of Neurobiology, Campus Gasthuisberg, Leuven, Belgium (A.W., R.L.)
| | - Tae-Hee Cho
- Department of Stroke Medicine, Université Claude Bernard Lyon 1, CREATIS CNRS UMR 5220-INSERM U1206, INSA-Lyon, France (T.-H.C., N.N.)
- Hospices Civils de Lyon, France (T.-H.C., N.N.)
| | - Martin Ebinger
- Centrum für Schlaganfallforschung Berlin, Charité–Universitätsmedizin Berlin, Campus Mitte, Germany (M. Ebinger, M. Endres, J.B.F., I.G.)
- Neurologie der Rehaklinik Medical Park Humboldtmühle, Berlin, Germany (M. Ebinger)
| | - Matthias Endres
- Centrum für Schlaganfallforschung Berlin, Charité–Universitätsmedizin Berlin, Campus Mitte, Germany (M. Ebinger, M. Endres, J.B.F., I.G.)
- Klinik und Hochschulambulanz für Neurologie, Charité–Universitätsmedizin Berlin, Germany (M. Endres)
| | - Jochen B. Fiebach
- Centrum für Schlaganfallforschung Berlin, Charité–Universitätsmedizin Berlin, Campus Mitte, Germany (M. Ebinger, M. Endres, J.B.F., I.G.)
| | - Jens Fiehler
- Department of Diagnostic and Interventional Neuroradiology (J.F.), University Medical Center Hamburg-Eppendorf, Germany
| | - Ivana Galinovic
- Centrum für Schlaganfallforschung Berlin, Charité–Universitätsmedizin Berlin, Campus Mitte, Germany (M. Ebinger, M. Endres, J.B.F., I.G.)
| | - Josep Puig
- Department of Radiology, Institut de Diagnostic per la Image, Hospital Dr Josep Trueta, Institut d’Investigació Biomèdica de Girona, Parc Hospitalari Martí i Julià de Salt, Girona, Spain (J.P., S.P.)
| | - Vincent Thijs
- Stroke Division, Florey Institute of Neuroscience and Mental Health, University of Melbourne, VIC, Australia (V.T.)
- Austin Health, Department of Neurology, VIC, Australia (V.T.)
| | - Robin Lemmens
- Department of Neurology, University Hospitals Leuven, Belgium (A.W., R.L.)
- Department of Neurosciences, Experimental Neurology, KU Leuven–University of Leuven, Belgium (A.W., R.L.)
- VIB, Center for Brain and Disease Research, Laboratory of Neurobiology, Campus Gasthuisberg, Leuven, Belgium (A.W., R.L.)
| | - Keith W. Muir
- Institute of Neuroscience and Psychology, University of Glasgow, United Kingdom (K.W.M.)
| | - Norbert Nighoghossian
- Department of Stroke Medicine, Université Claude Bernard Lyon 1, CREATIS CNRS UMR 5220-INSERM U1206, INSA-Lyon, France (T.-H.C., N.N.)
- Hospices Civils de Lyon, France (T.-H.C., N.N.)
| | - Salvador Pedraza
- Department of Radiology, Institut de Diagnostic per la Image, Hospital Dr Josep Trueta, Institut d’Investigació Biomèdica de Girona, Parc Hospitalari Martí i Julià de Salt, Girona, Spain (J.P., S.P.)
| | - Claus Z. Simonsen
- Department of Neurology, Aarhus University Hospital, Denmark (C.Z.S.)
| | - Christian Gerloff
- From the Klinik und Poliklinik für Neurologie, Kopf- und Neurozentrum (B.C., A.N., C.G., G.T.), University Medical Center Hamburg-Eppendorf, Germany
| | - Götz Thomalla
- From the Klinik und Poliklinik für Neurologie, Kopf- und Neurozentrum (B.C., A.N., C.G., G.T.), University Medical Center Hamburg-Eppendorf, Germany
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Rodríguez-Fernández A, Bonnet L, Crespos C, Larrégaray P, Díez Muiño R. When Classical Trajectories Get to Quantum Accuracy: The Scattering of H 2 on Pd(111). J Phys Chem Lett 2019; 10:7629-7635. [PMID: 31774684 DOI: 10.1021/acs.jpclett.9b02742] [Citation(s) in RCA: 7] [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: 06/10/2023]
Abstract
When elementary reactive processes occur at such low energies that only a few states of reactants and/or products are available, quantum effects strongly manifest and the standard description of the dynamics within the classical framework fails. We show here, for H2 scattering on Pd(111), that by pseudoquantizing in the spirit of Bohr the relevant final actions of the system, along with adequately treating the diffraction-mediated trapping of the incoming wave, classical simulations achieve an unprecedented agreement with state-of-the-art quantum dynamics calculations.
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Affiliation(s)
- A Rodríguez-Fernández
- Université de Bordeaux, ISM , UMR 5255, F-33400 Talence , France
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU) , Paseo Manuel de Lardizabal 5 , 20018 Donostia-San Sebastián , Spain
| | - L Bonnet
- Université de Bordeaux, ISM , UMR 5255, F-33400 Talence , France
- CNRS, ISM , UMR 5255, F-33400 Talence , France
| | - C Crespos
- Université de Bordeaux, ISM , UMR 5255, F-33400 Talence , France
- CNRS, ISM , UMR 5255, F-33400 Talence , France
| | - P Larrégaray
- Université de Bordeaux, ISM , UMR 5255, F-33400 Talence , France
- CNRS, ISM , UMR 5255, F-33400 Talence , France
| | - R Díez Muiño
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU) , Paseo Manuel de Lardizabal 5 , 20018 Donostia-San Sebastián , Spain
- Donostia International Physics Center (DIPC) , Paseo Manuel de Lardizabal 4 , 20018 Donostia-San Sebastián , Spain
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11
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Razanamahery J, Payet‐Revest C, Mareschal A, Saizonou I, Bonnet L, Gil H, Humbert S, Magy‐Bertrand N. Early failure of eculizumab in a patient with malignant atrophic papulosis: Is it time for initial combination therapy of eculizumab and treprostinil? J Dermatol 2019; 47:e22-e23. [DOI: 10.1111/1346-8138.15120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jerome Razanamahery
- Department of Internal Medicine Besancon University Hospital Besancon France
| | | | - Adrien Mareschal
- Department of Dermatology Besancon University Hospital Besancon France
| | - Ines Saizonou
- Department of Pathology Besancon University Hospital Besancon France
| | - Louise Bonnet
- Department of Neurology Besancon University Hospital Besancon France
| | - Helder Gil
- Department of Internal Medicine Besancon University Hospital Besancon France
| | - Sebastien Humbert
- Department of Internal Medicine Besancon University Hospital Besancon France
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12
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Bonnet L, Larrégaray P, Lara M, Launay JM. Theoretical Study of Barrierless Chemical Reactions Involving Nearly Elastic Rebound: The Case of S( 1D) + X 2, X = H, D. J Phys Chem A 2019; 123:6439-6454. [PMID: 31329443 DOI: 10.1021/acs.jpca.9b04938] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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
For some values of the total angular momentum consistent with reaction, the title processes involve nonreactive trajectories proceeding through a single rebound mechanism during which the internal motion of the reagent diatom is nearly unperturbed. When such paths are in a significant amount, the classical reaction probability is found to be markedly lower than the quantum mechanical one. This finding was recently attributed to an unusual quantum effect called diffraction-mediated trapping, and a semiclassical correction was proposed in order to take into account this effect in the classical trajectory method. In the present work, we apply the resulting approach to the calculation of opacity functions as well as total and state-resolved integral cross sections (ICSs) and compare the values obtained with exact quantum ones, most of which are new. As the title reactions proceed through a deep insertion well, mean potential statistical calculations are also presented. Seven values of the collision energy, ranging from 30 to 1127 K, are considered. Two remarkable facts stand out: (i) The corrected classical treatment strongly improves the accuracy of the opacity function as compared to the usual classical treatment. When the entrance transition state is tight, however, those trajectories crossing it with a bending vibrational energy below the zero point energy must be discarded. (ii) The quantum opacity function, particularly its cutoff, is finely reproduced by the statistical approach. Consequently, the total ICS is also very well described by the two previous approximate methods. These, however, do not predict state-resolved ICSs with the same accuracy, proving thereby that (i) one or several genuine quantum effects involved in the dynamics are missed by the corrected classical treatment and (ii) the dynamics are not fully statistical.
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Affiliation(s)
- L Bonnet
- Université de Bordeaux, ISM , UMR 5255, F-33400 Talence , France.,CNRS , ISM , UMR 5255, F-33400 Talence , France
| | - P Larrégaray
- Université de Bordeaux, ISM , UMR 5255, F-33400 Talence , France.,CNRS , ISM , UMR 5255, F-33400 Talence , France
| | - M Lara
- Departamento de Química Física Aplicada, Facultad de Ciencias , Universidad Autónoma de Madrid , 28049 Madrid , Spain
| | - J-M Launay
- Institut de Physique de Rennes, UMR CNRS 6251 , Université de Rennes I , F-35042 Rennes , France
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13
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Charbonnier G, Béreau M, Bonnet L, Medeiros de Bustos E, Vuillier F, Moulin T. Neuro-lupus révélé par une hémiparésie et des mouvements anormaux chez une adolescente. Presse Med 2019; 48:195-198. [DOI: 10.1016/j.lpm.2018.11.021] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 11/12/2018] [Accepted: 11/27/2018] [Indexed: 11/29/2022] Open
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14
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Brandicourt P, Blanc C, Bonnet L, Béjot Y, Ricolfi F, Drouet C, Moulin T, Thines L. Adult moyamoya angiopathy in Bourgogne-Franche-Comté: Epidemiology, diagnosis and management. Rev Neurol (Paris) 2018; 175:247-251. [PMID: 30447881 DOI: 10.1016/j.neurol.2018.05.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Revised: 05/06/2018] [Accepted: 05/28/2018] [Indexed: 12/01/2022]
Abstract
INTRODUCTION Moyamoya angiopathy (MMA) is a progressive steno-occlusive disease of the distal internal carotid arteries mainly described in Asia. It induces the development of collateral vascular networks to reduce chronic cerebral hypoperfusion. Symptoms depend on the patient's age in Asia: children are at greater risk of transient or constituted ischemic events, whereas adults are more exposed to hemorrhagic stroke. Data from the literature seem to show that the pattern of MMA in western countries differs from that in Asia. MATERIAL AND METHODS A retrospective study of patients with MMA was conducted in Bourgogne-Franche-Comté (mid-eastern France). Clinical data (symptoms, risk factors, age at diagnosis, number and timing of recurrences, type of treatment) as well as radiological data (angiographic findings, Suzuki's grade) were analyzed. RESULTS Seventeen adult patients (9 men, 53%) were followed at the university hospitals of Besançon and Dijon from 2009 to 2016. Fourteen patients (83%) had bilateral disease. The mean age at diagnosis was 49 years (±16), 83% of the patients were Caucasian and 17% originated from Maghreb. Only 17% of the hemispheres had a hemorrhagic form. Ischemic form was more frequent before diagnosis with transient ischemic attack (24% of patients) and stroke (83% of patients). With medical treatment, 9 patients suffered from stroke recurrence (53% of patients) with an average delay of 22.7±34 months. Three patients (18%) had combined surgical management by encephelo-synangiosis and superficial temporal artery-to-middle cerebral artery (STA-MCA) anastomosis, without symptom recurrence after treatment with an average follow up of 14 months. CONCLUSION MMA remains a rare cerebrovascular disease in Europe and requires multidisciplinary care. Epidemiological analysis showed differences with the Asian population, especially the predominance of ischemic forms in adults.
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Affiliation(s)
- P Brandicourt
- Service de neurochirurgie, université Bourgogne-Franche-Comté, CHRU de Besançon, 25000 Besançon, France.
| | - C Blanc
- Service de neurologie générale, vasculaire et dégénérative, université Bourgogne-Franche-Comté, CHU de Dijon, 21000 Dijon, France
| | - L Bonnet
- Unité de neurologie vasculaire, université Bourgogne-Franche-Comté, CHRU de Besançon, 25000 Besançon, France
| | - Y Béjot
- Service de neurologie générale, vasculaire et dégénérative, université Bourgogne-Franche-Comté, CHU de Dijon, 21000 Dijon, France
| | - F Ricolfi
- Service de neuroradiologie diagnostique et interventionnelle, université Bourgogne-Franche-Comté, CHU de Dijon, 21000 Dijon, France
| | - C Drouet
- Service de médecine nucléaire, université Bourgogne-Franche-Comté, CHRU de Besançon, 25000 Besançon, France
| | - T Moulin
- Unité de neurologie vasculaire, université Bourgogne-Franche-Comté, CHRU de Besançon, 25000 Besançon, France
| | - L Thines
- Service de neurochirurgie, université Bourgogne-Franche-Comté, CHRU de Besançon, 25000 Besançon, France
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15
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Bonnet L. Semiclassical initial value theory of rotationally inelastic scattering: Some remarks on the phase index in the interaction picture. J Chem Phys 2018; 148:194104. [PMID: 30307190 DOI: 10.1063/1.5024785] [Citation(s) in RCA: 6] [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: 11/14/2022] Open
Abstract
This paper deals with the treatment of quantum interferences in the semiclassical initial value theory of rotationally inelastic scattering in the interaction picture. Like many semiclassical methods, the previous approach involves a phase index related to sign changes of a Jacobian whose square root is involved in the calculations. It is shown that replacing the original phase index by a new one extends the range of applicability of the theory. The resulting predictions are in close agreement with exact quantum scattering results for a model of atom-rigid diatom collision involving strong interferences. The developments are performed within the framework of the planar rotor model, but are readily applicable to three-dimensional collisions.
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Affiliation(s)
- L Bonnet
- CNRS, ISM, UMR 5255, F-33400 Talence, France and Université de Bordeaux, ISM, UMR 5255, F-33400 Talence, France
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16
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Al-Obaidi R, Salehi H, Desoutter A, Bonnet L, Etienne P, Terrer E, Jacquot B, Levallois B, Tassery H, Cuisinier FJG. Chemical & Nano-mechanical Study of Artificial Human Enamel Subsurface Lesions. Sci Rep 2018; 8:4047. [PMID: 29511281 PMCID: PMC5840409 DOI: 10.1038/s41598-018-22459-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/22/2018] [Indexed: 11/23/2022] Open
Abstract
White lesions represent an early phase of caries formation. 20 human sound premolars were subjected to pH cycling procedure to induce subsurface lesions (SLs) in vitro. In addition, 2 teeth with naturally developed white spot lesions (WSLs) were used as references. All specimens characterized by confocal Raman microscopy being used for the first time in examining white & subsurface lesions and providing a high resolution chemical and morphological map based on phosphate peak intensity alterations at 960 cm-1. Nanoindentation technique was used to measure Hardness (H) and Young's modulus (E) of enamel. Phosphate map of examined samples exhibited presence of intact surface layer (ISL) followed by severe depletion in (PO43-) peak in the area corresponding to the body of the lesion. In all examined groups, the mechanical properties of enamel were decreased in lesion area and found to be inversely related to penetration depth of indenter owing to enamel hierarchical structure. By combining the above two techniques, we linked mechanical properties of enamel to its chemical composition and ensured that the two methods are highly sensitive to detect small changes in enamel composition. Further work is required to bring these two excellent tools to clinical application to perceive carious lesions at an early stage of development.
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Affiliation(s)
- R Al-Obaidi
- LBN, Univ. Montpellier, Montpellier, France.
| | - H Salehi
- LBN, Univ. Montpellier, Montpellier, France
| | | | - L Bonnet
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, FR-34095, France
| | - P Etienne
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, FR-34095, France
| | - E Terrer
- LBN, Univ. Montpellier, Montpellier, France
- Aix Marseille University, Marseille, France
| | - B Jacquot
- Aix Marseille University, Marseille, France
| | | | - H Tassery
- LBN, Univ. Montpellier, Montpellier, France
- Aix Marseille University, Marseille, France
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17
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Brandicourt P, Bonnet L, Béjot Y, Drouet C, Moulin T, Thines L. Moya-Moya syndrome after cranial radiation for optic glioma with NF1. Case report and literature review of syndromic cases. Neurochirurgie 2018; 64:63-67. [PMID: 29475609 DOI: 10.1016/j.neuchi.2017.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 08/05/2017] [Revised: 11/18/2017] [Accepted: 11/27/2017] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Moya-Moya angiopathy is a neurovascular disease that predisposes to ischemic or hemorrhagic strokes. It is generated by a steno-occlusion of the terminal portion of the internal carotid arteries, which induces the development of abnormal neovessels in the deep regions of the brain. Some pathologies such as sickle cell disease, Down syndrome or Graves' disease may be associated with Moya-Moya angiopathy. These syndromic forms harbor several differences compared with idiopathic Moya-Moya disease. CASE REPORT We report the case of a young patient who presented with a syndromic form of Moya-Moya angiopathy after cranial radiation therapy for an optic glioma associated with type 1 neurofibromatosis treated by combined revascularization. We discuss the particularities of syndromic forms, in their presentation and management based on a review of the literature. CONCLUSION Many diseases can be associated with Moya-Moya syndrome. Symptomatic patients should undergo surgery, but the risk of postoperative complications appears to be greater than that encountered in patients with non-syndromic Moya-Moya angiopathy.
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Affiliation(s)
- P Brandicourt
- Service de neurochirurgie, CHRU de Besançon, université Bourgogne-Franche-Comté, 3, boulevard Alexandre-Fleming, 25030 Besançon, France.
| | - L Bonnet
- Unité de neurologie vasculaire, CHRU de Besançon, université Bourgogne-Franche-Comté, 3, boulevard Alexandre-Fleming, 25030 Besançon, France
| | - Y Béjot
- Service de neurologie générale, vasculaire et dégénérative, CHU de Dijon, université Bourgogne-Franche-Comté, 14 rue Paul-Gaffarel, 21000 Dijon, France
| | - C Drouet
- Service de médecine nucléaire, CHRU de Besançon, université Bourgogne-Franche-Comté, 3, boulevard Alexandre-Fleming, 25030 Besançon, France
| | - T Moulin
- Unité de neurologie vasculaire, CHRU de Besançon, université Bourgogne-Franche-Comté, 3, boulevard Alexandre-Fleming, 25030 Besançon, France
| | - L Thines
- Service de neurochirurgie, CHRU de Besançon, université Bourgogne-Franche-Comté, 3, boulevard Alexandre-Fleming, 25030 Besançon, France
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18
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Bonnet L, Linguerri R, Hochlaf M, Yazidi O, Halvick P, Francisco JS. Full-Dimensional Theory of Pair-Correlated HNCO Photofragmentation. J Phys Chem Lett 2017; 8:2420-2424. [PMID: 28498666 DOI: 10.1021/acs.jpclett.7b00920] [Citation(s) in RCA: 7] [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: 06/07/2023]
Abstract
Full-dimensional semiclassical dynamical calculations combining classical paths and Bohr quantization of product internal motions are reported for the prototype photofragmentation of isocyanic acid in the S1 state. These calculations allow one to closely reproduce for the first time key features of state-of-the-art imaging measurements at photolysis wavelengths of 201 and 210 nm while providing insight into the underlying dissociation mechanism. Quantum scattering calculations being beyond reach for most polyatomic fissions, pair-correlated data on these processes are much more often measured than predicted. Our theoretical approach can be used to fill this gap.
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Affiliation(s)
- L Bonnet
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS, UMR 5255 , 33405 Talence, France
| | - R Linguerri
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, UMR 8208 CNRS , 5 Bd Descartes, 77454 Marne La Vallée, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, UMR 8208 CNRS , 5 Bd Descartes, 77454 Marne La Vallée, France
| | - O Yazidi
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, LR01ES09, Faculté des Sciences de Tunis, Université de Tunis El Manar , 2092 Tunis, Tunisia
| | - P Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS, UMR 5255 , 33405 Talence, France
| | - J S Francisco
- Department of Chemistry, University of Nebraska-Lincoln , 433 Hamilton Hall, Lincoln, Nebraska 68588-0304, United States
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19
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Bonnet L, Comte A, Tatu L, Millot JL, Moulin T, Medeiros de Bustos E. The role of the amygdala in the perception of positive emotions: an "intensity detector". Front Behav Neurosci 2015. [PMID: 26217205 PMCID: PMC4493392 DOI: 10.3389/fnbeh.2015.00178] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
The specific role of the amygdala remains controversial even though the development of functional imaging techniques has established its implication in the emotional process. The aim of this study was to highlight the sensitivity of the amygdala to emotional intensity (arousal). We conducted an analysis of the modulation of amygdala activation according to variation in emotional intensity via an fMRI event-related protocol. Monitoring of electrodermal activity, a marker of psychophysiological emotional perception and a reflection of the activation of the autonomic nervous system, was carried out concurrently. Eighteen subjects (10 men; aged from 22 to 29 years) looked at emotionally positive photographs. We demonstrated that the left and right amygdalae were sensitive to changes in emotional intensity, activating more in response to stimuli with higher intensity. Furthermore, electrodermal responses were more frequent for the most intense stimuli, demonstrating the concomitant activation of the autonomic nervous system. These results highlight the sensitivity of the amygdala to the intensity of positively valenced visual stimuli, and in conjunction with results in the literature on negative emotions, reinforce the role of the amygdala in the perception of intensity.
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Affiliation(s)
- Louise Bonnet
- Department of Neurology, Besancon University Hospital Besancon, France ; Department of Research in Functional Imaging, CIC 808, Besancon University Hospital Besancon, France ; Laboratory of Integrative and Clinical Neuroscience, EA 481, SFR FED 4234 UFC-CHRU-EFS Besancon, France
| | - Alexandre Comte
- Department of Research in Functional Imaging, CIC 808, Besancon University Hospital Besancon, France ; Laboratory of Integrative and Clinical Neuroscience, EA 481, SFR FED 4234 UFC-CHRU-EFS Besancon, France
| | - Laurent Tatu
- Department of Neurology, Besancon University Hospital Besancon, France ; Department of Research in Functional Imaging, CIC 808, Besancon University Hospital Besancon, France ; Laboratory of Integrative and Clinical Neuroscience, EA 481, SFR FED 4234 UFC-CHRU-EFS Besancon, France
| | - Jean-Louis Millot
- Laboratory of Integrative and Clinical Neuroscience, EA 481, SFR FED 4234 UFC-CHRU-EFS Besancon, France
| | - Thierry Moulin
- Department of Neurology, Besancon University Hospital Besancon, France ; Department of Research in Functional Imaging, CIC 808, Besancon University Hospital Besancon, France ; Laboratory of Integrative and Clinical Neuroscience, EA 481, SFR FED 4234 UFC-CHRU-EFS Besancon, France
| | - Elisabeth Medeiros de Bustos
- Department of Neurology, Besancon University Hospital Besancon, France ; Department of Research in Functional Imaging, CIC 808, Besancon University Hospital Besancon, France ; Laboratory of Integrative and Clinical Neuroscience, EA 481, SFR FED 4234 UFC-CHRU-EFS Besancon, France
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20
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Bonnet L, Raposo N, Blot-Souletie N, Faruch Bilfeld M, Chollet F, Mazière J, Olivot JM, Albucher JF. Stroke Caused by a Pulmonary Vein Thrombosis Revealing a Metastatic Choriocarcinoma. Circulation 2015; 131:2093-4. [DOI: 10.1161/circulationaha.114.011429] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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: 12/29/2022]
Affiliation(s)
- Louise Bonnet
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - Nicolas Raposo
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - Nathalie Blot-Souletie
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - Marie Faruch Bilfeld
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - François Chollet
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - Julien Mazière
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - Jean-Marc Olivot
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
| | - Jean-François Albucher
- From Stroke Unit, Department of Neurology, Besancon University Hospital, France (L.B.); Stroke Unit, Department of Neurology (N.R., F.C., J.-M.O., J.-F.A.), Department of Cardiology (N.B.-S.), and Department of Radiology (M.F.-B.), Purpan University Hospital, Toulouse, France; and Department of Pneumology, Larrey University Hospital, Toulouse, France (J.M.)
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Meyer A, Bonnet L, Bourbon M, Blanc P. Totally extraperitoneal (TEP) endoscopic inguinal hernia repair with TAP (transversus abdominis plane) block as a day-case: A prospective cohort study. J Visc Surg 2015; 152:155-9. [DOI: 10.1016/j.jviscsurg.2014.12.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Arbelo-González W, Bonnet L, García-Vela A. Semiclassical Wigner theory of photodissociation in three dimensions: Shedding light on its basis. J Chem Phys 2015; 142:134111. [PMID: 25854232 DOI: 10.1063/1.4916646] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The semiclassical Wigner theory (SCWT) of photodissociation dynamics, initially proposed by Brown and Heller [J. Chem. Phys. 75, 186 (1981)] in order to describe state distributions in the products of direct collinear photodissociations, was recently extended to realistic three-dimensional triatomic processes of the same type [Arbelo-González et al., Phys. Chem. Chem. Phys. 15, 9994 (2013)]. The resulting approach, which takes into account rotational motions in addition to vibrational and translational ones, was applied to a triatomic-like model of methyl iodide photodissociation and its predictions were found to be in nearly quantitative agreement with rigorous quantum results, but at a much lower computational cost, making thereby SCWT a potential tool for the study of polyatomic reaction dynamics. Here, we analyse the main reasons for this agreement by means of an elementary model of fragmentation explicitly dealing with the rotational motion only. We show that our formulation of SCWT makes it a semiclassical approximation to an approximate planar quantum treatment of the dynamics, both of sufficient quality for the whole treatment to be satisfying.
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Affiliation(s)
- W Arbelo-González
- Max Planck Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
| | - L Bonnet
- CNRS, Institut des Sciences Moléculaires, UMR 5255, 33405 Talence, France
| | - A García-Vela
- Instituto de Física Fundamental, C.S.I.C., Serrano 123, 28006 Madrid, Spain
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Theissen A, Fuz F, Carbonne B, Bonnet L, Rouquette-Vincenti I, Niccolai P, Raucoules-Aime M. [Closed claims in obstetrics: A study based on French Sham insurance data]. J Gynecol Obstet Biol Reprod (Paris) 2015; 45:54-61. [PMID: 25863577 DOI: 10.1016/j.jgyn.2015.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 02/14/2015] [Accepted: 02/27/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE The aim of this study was to analyze the medicolegal claims related to obstetrics in French hospitals. MATERIAL AND METHODS We did retrospective study on insurance claims provided by Sham insurances and which has been settled by a court over a 3-year period (2004-2006). RESULTS We analyzed 66 closed claims that occurred between 1983 and 2005 in French hospitals (54 general hospitals and 12 academic). The average time between the declaration of the claim and the court conviction was 6 years. The average amount of compensation per claim was 500,000 €. The damage occurred during vaginal delivery (n=44), planned (n=5) or unplanned (n=4) cesarean. The more often claims are fetal asphyxia (n=24) or shoulder dystocia (n=8). The consequences are very important: cerebral palsy (16), death of the newborn (12), death of the mother (2) or brachial plexus injuries (6). CONCLUSION The causes identified by the expert are always multifactorial with generally a misdiagnosis (n=27), a decision making error (n=36), a care error by the midwife (n=21) and/or a delay in medical care (n=13). These data should help strengthen the quality approach in obstetrics.
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Affiliation(s)
- A Theissen
- Service d'anesthésie-réanimation, centre hospitalier Princesse-Grace, 1, avenue Pasteur, 98000 Monaco, Monaco.
| | - F Fuz
- Sham, service gestion des risques, 69008 Lyon, France
| | - B Carbonne
- Unité d'obstétrique, maternité de l'hôpital Trousseau, université Pierre et Marie Curie, Paris 6, 75012 Paris, France
| | - L Bonnet
- Service d'anesthésie-réanimation, centre hospitalier Princesse-Grace, 1, avenue Pasteur, 98000 Monaco, Monaco
| | - I Rouquette-Vincenti
- Service d'anesthésie-réanimation, centre hospitalier Princesse-Grace, 1, avenue Pasteur, 98000 Monaco, Monaco
| | - P Niccolai
- Service d'anesthésie et chirurgie ambulatoire, centre hospitalier Princesse-Grace, 1, avenue Pasteur, 98000 Monaco, Monaco
| | - M Raucoules-Aime
- Département d'anesthésie-réanimation, CHU, hôpital Archet 2, 151, route Saint-Antoine de Ginestière, 06200 Nice, France
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Espinosa-Garcia J, Corchado J, Bonnet L. Quasi-classical trajectory study of the water vibrational distribution for the polyatomic OH/OD+NH3 reactions: Comparison with experiment. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.12.028] [Citation(s) in RCA: 4] [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: 10/24/2022]
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Carré C, Bonnet L, Avérous L. Solvent- and catalyst-free synthesis of fully biobased nonisocyanate polyurethanes with different macromolecular architectures. RSC Adv 2015. [DOI: 10.1039/c5ra17638g] [Citation(s) in RCA: 44] [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] Open
Abstract
A bis(cyclic carbonate) based on a dimeric fatty acid was successfully synthesized.
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Affiliation(s)
- C. Carré
- BioTeam/ICPEES-ECPM
- UMR CNRS 7515
- Université de Strasbourg
- 67087 Strasbourg Cedex 2, France
| | - L. Bonnet
- BioTeam/ICPEES-ECPM
- UMR CNRS 7515
- Université de Strasbourg
- 67087 Strasbourg Cedex 2, France
| | - L. Avérous
- BioTeam/ICPEES-ECPM
- UMR CNRS 7515
- Université de Strasbourg
- 67087 Strasbourg Cedex 2, France
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Bonnet L, Karkeni E, Astier J, Dalifard J, Couturier C, Landrier JF. P200: Une supplémentation en vitamine D induit une modification de l’expression des gènes impliqués dans son propre métabolisme, au niveau du tissu adipeux, chez la souris. NUTR CLIN METAB 2014. [DOI: 10.1016/s0985-0562(14)70842-8] [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: 11/26/2022]
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Bonnet L, Magnin E, Comte A, Rumbach L. Hemifacial spasm revealing contralateral peripheral facial palsy. Rev Neurol (Paris) 2013; 169:1015-6. [PMID: 24120245 DOI: 10.1016/j.neurol.2013.02.009] [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] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 12/10/2012] [Accepted: 02/27/2013] [Indexed: 10/26/2022]
Affiliation(s)
- L Bonnet
- Department of Neurology, J. Minjoz University Hospital, 3, boulevard Alexandre-Fleming, 25030 Besançon cedex, France.
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Abstract
The semiclassical Wigner treatment of bimolecular collisions, proposed by Lee and Scully on a partly intuitive basis [J. Chem. Phys. 73, 2238 (1980)], is derived here from first principles. The derivation combines Heller's ideas [J. Chem. Phys. 62, 1544 (1975); ibid. 65, 1289 (1976); ibid. 75, 186 (1981)], the backward picture of molecular collisions [L. Bonnet, J. Chem. Phys. 133, 174108 (2010)] and the microreversibility principle.
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Affiliation(s)
- L Bonnet
- CNRS, University of Bordeaux, ISM, UMR 5255, 33405 Talence, France
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Arbelo-González W, Bonnet L, García-Vela A. New insights into the semiclassical Wigner treatment of photodissociation dynamics. Phys Chem Chem Phys 2013; 15:9994-10011. [PMID: 23712618 DOI: 10.1039/c3cp50524c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [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
The semiclassical Wigner treatment of Brown and Heller [J. Chem. Phys. 1981, 75, 186] is applied to direct triatomic (or triatomic-like polyatomic) photodissociations with the aim of accurately predicting final state distributions at relatively low computational cost, and having available a powerful interpretative tool. For the first time, the treatment takes rotational motions into account. The proposed formulation closely parallels the quantum description as far as possible. An approximate version is proposed, which is still accurate while numerically much more efficient. In addition to being weighted by usual vibrational Wigner distributions, final phase space states appear to be weighted by new rotational Wigner distributions. These densities have remarkable structures clearly showing that classical trajectories most contributing to rotational state j are those reaching the products with a rotational angular momentum close to [j(j + 1)](1/2) (in ℏ units). The previous methods involve running trajectories from the reagent molecule onto the products. The alternative backward approach [L. Bonnet, J. Chem. Phys., 2010, 133, 174108], in which trajectories are run in the reverse direction, is shown to strongly improve the numerical efficiency of the most rigorous method in addition to being state-selective, and thus, ideally suited to the description of state-correlated distributions measured in velocity imaging experiments. The results obtained by means of the previous methods are compared with rigorous quantum results in the case of Guo's triatomic-like model of methyl iodide photodissociation [J. Chem. Phys., 1992, 96, 6629] and close agreement is found. In comparison, the standard method of Goursaud et al. [J. Chem. Phys., 1976, 65, 5453] is only semi-quantitative.
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Ruf H, Handschin C, Ferré A, Thiré N, Bertrand JB, Bonnet L, Cireasa R, Constant E, Corkum PB, Descamps D, Fabre B, Larregaray P, Mével E, Petit S, Pons B, Staedter D, Wörner HJ, Villeneuve DM, Mairesse Y, Halvick P, Blanchet V. High-harmonic transient grating spectroscopy of NO2 electronic relaxation. J Chem Phys 2012; 137:224303. [DOI: 10.1063/1.4768810] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H Ruf
- Université de Bordeaux-CNRS-CEA, CELIA, UMR5107, F-33400 Talence, France
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Bonnet L, Medeiros de Bustos E, Moulin T. [Opsoclonus-Myoclonus syndrome in adults]. Rev Neurol (Paris) 2012; 168:987-8. [PMID: 22682052 DOI: 10.1016/j.neurol.2012.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 03/09/2012] [Accepted: 03/14/2012] [Indexed: 10/28/2022]
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Bonnet L, Larrégaray P, Arbelo-González W, de Castro-Vítores M. Normalization of the Gaussian binning trajectory method for indirect reactions. COMPUT THEOR CHEM 2012. [DOI: 10.1016/j.comptc.2011.11.001] [Citation(s) in RCA: 12] [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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Arbelo-González W, Bonnet L, Larrégaray P, Rayez JC, Rubayo-Soneira J. Classical photodissociation dynamics with Bohr quantization: Application to the fragmentation of a van der Waals cluster. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.07.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Meyer N, Bonnet L, Galli S, Verlut C, Champonois L, Moulin T, Medeiros de Bustos E. « From door-to-bed » : évaluation de la filière des urgences neuro-vasculaires bisontines. Rev Neurol (Paris) 2012. [DOI: 10.1016/j.neurol.2012.01.236] [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: 10/28/2022]
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Bonnet L, Espinosa-García J, Corchado J, Liu S, Zhang DH. Classical versus quantum vibrational state distributions for the benchmark polyatomic reaction OH+D2: Checking the validity of the QCT method. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.09.086] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Rivero-Santamaría A, González-Martínez ML, González-Lezana T, Rubayo-Soneira J, Bonnet L, Larrégaray P. The O((1)D) + H2 (X (1)Σ+, v, j) → OH(X (2)Π, v', j') + H((2)S) reaction at low collision energy: when a simple statistical description of the dynamics works. Phys Chem Chem Phys 2011; 13:8136-9. [PMID: 21437306 DOI: 10.1039/c0cp02662j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [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
In this communication, we highlight that statistical approaches for chemical reactions describe reasonably well the low energy dynamics of the title process. Consequently, such methods prove to be valuable to compute rate constants from low to room temperatures. Results are compared with experiment and recent precise quantum wave packet calculations [J. Phys. Chem. A, 2009, 113, 5285].
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Affiliation(s)
- A Rivero-Santamaría
- Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM), UMR CNRS 8523, Centre d'Etudes et de Recherches Lasers et Applications, FR CNRS 2416, Université Lille I Sciences et Technologies, 59655 Villeneuve d'Ascq Cedex, France
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Abstract
In recent years, many chemical reactions have been studied by means of the quasiclassical trajectory (QCT) method within the Gaussian binning (GB) procedure. The latter consists of "quantizing" the final vibrational actions in Bohr spirit by putting strong emphasis on the trajectories reaching the products with vibrational actions close to integer values. A major drawback of this procedure is that if N is the number of product vibrational modes, the amount of trajectories necessary to converge the calculations is ∼10(N)×larger than with the standard QCT method. Applying it to polyatomic processes is thus problematic. In a recent paper, however, Czakó and Bowman propose to quantize the total vibrational energy instead of the vibrational actions [G. Czakó and J. M. Bowman, J. Chem. Phys. 131, 244302 (2009)], a procedure called 1GB here. The calculations are then only ∼10 times more time consuming than with the standard QCT method, allowing thereby for considerable numerical saving. In this paper, we propose some theoretical arguments supporting the 1GB procedure and check its validity on model test cases as well as the prototype four-atom reaction OH+D(2)→HOD+D.
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Affiliation(s)
- L Bonnet
- Institut des Sciences Moléculaires, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France.
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Espinosa-Garcia J, Bonnet L, Corchado JC. Classical description in a quantum spirit of the prototype four-atom reaction OH + D2. Phys Chem Chem Phys 2010; 12:3873-7. [DOI: 10.1039/b922389d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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González-Martínez ML, Bonnet L, Larrégaray P, Rayez JC, Rubayo-Soneira J. Transformation from angle-action variables to Cartesian coordinates for polyatomic reactions. J Chem Phys 2009; 130:114103. [DOI: 10.1063/1.3089602] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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González-Martínez M, Arbelo-González W, Rubayo-Soneira J, Bonnet L, Rayez JC. Vibrational predissociation of van der Waals complexes: Quasi-classical results with Gaussian-weighted trajectories. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.08.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
A nonconventional application of phase space theory to the insertion reactions A+H(2), with A=C((1)D) and S((1)D), is presented. Instead of approximating the potential energies of interaction between separated fragments by their isotropic long-range contributions, as in the original theory, the latter are replaced by the accurate potential energies averaged with respect to Jacobi angles. The integral and differential cross sections obtained from this mean potential phase space theory (MPPST) turn out to be in very satisfying agreement with the benchmark predictions of the time-independent and time-dependent statistical quantum methods. The formal and numerical simplicity of MPPST with respect to any approach combining statistical assumptions and dynamical calculations makes it a promising tool for studying indirect polyatomic reactions.
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Affiliation(s)
- P Larrégaray
- Institut des Sciences Moléculaires, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France
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González-Martínez ML, Bonnet L, Larrégaray P, Rayez JC. Classical treatment of molecular collisions: striking improvement of the description of recoil energy distributions using Gaussian weighted trajectories. J Chem Phys 2007; 126:041102. [PMID: 17286453 DOI: 10.1063/1.2435716] [Citation(s) in RCA: 26] [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: 11/14/2022] Open
Abstract
The Gaussian weighting (GW) procedure, recently used in the classical treatment of molecular collisions, is a practical way of taking into account quantization of product vibrational actions. The goal of this brief communication is to show that the GW procedure may drastically improve the predictions of the recoil energy distribution between final fragments, an observable frequently measured in molecular beam experiments.
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Affiliation(s)
- M L González-Martínez
- Laboratoire de Physico-Chimie Moléculaire, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France
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Bonnet L, Larrégaray P, Rayez JC. On the theory of complex-forming chemical reactions: effect of parity conservation on the polarization of differential cross sections. Phys Chem Chem Phys 2007; 9:3228-40. [PMID: 17579731 DOI: 10.1039/b700906b] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [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: 11/21/2022]
Abstract
For complex-forming triatomic reactions such as the prototypical insertion reactions intensively studied in the last few years, quantum mechanical differential cross sections (DCS) present sharp forward/backward polarization peaks when the reagent rotational angular momentum quantum number j is zero. Moreover, the size of the peaks decreases rapidly with increasing j values so that for j = 3, they are no longer visible. In contrast, the polarization peaks are always missing in the classical mechanical DCSs. Apart from the peaks, however, the quantum and classical DCSs are usually in good agreement. In a recent rapid communication, we showed that the fundamental reason for the previous differences in the quantum and classical scenarios is that parity conservation leads in quantum mechanics to an angular momentum constraint without equivalent in classical mechanics. We also proposed a parity-restoring approximation leading to an accurate semi-classical description of the peaks. While only the main lines of the demonstration were given in the communication, we report here the whole developments. We also analyse why the peaks disappear when the reagent diatom is rotationally excited. As a by-product of the previous developments, we finally discuss the possibility of a general statistico-dynamical semiclassical approach.
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Affiliation(s)
- L Bonnet
- Institut des Sciences Moléculaires, Université Bordeaux 1, 351 Cours de la Libération, 33405, Talence Cedex, France.
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Iversen V, Schaller J, Drews A, Bonnet L, Lesjean B, Kraume M. Einfluss von flusssteigernden Zusatzstoffen auf das Foulingverhalten bei Cross-Flow- Mikrofiltration. CHEM-ING-TECH 2006. [DOI: 10.1002/cite.200650081] [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: 11/09/2022]
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Abstract
In associative desorptions governed by short-range forces, strong energy transfers between rotational, translational, and vibrational degrees of freedom of the nascent molecule take place beyond the transition state (TS). State or energy distributions are thus different at the TS and in the vacuum. Inspired by previous studies on unimolecular reactions, a statisticodynamical approach (SDA) is proposed which combines the transition state theory for the description of state distributions at the TS and a simple dynamical model to account for the effect of the post-TS dynamics on these distributions. The agreement found between the predictions of SDA, the much more demanding classical trajectory calculations, and experimental results in the case of H(2) and D(2) desorbing from Cu(111) is very satisfying. In addition to that, the formulation highlights some key factors of state distributions which would have been difficult to directly extract from a dynamical study. The notions of vibrational heating and rotational cooling are discussed within this context.
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Affiliation(s)
- A Perrier
- Laboratoire de Physico-Chimie Moléculaire, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France
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Bonnet L, Larrégaray P, Rayez JC, Gonzalez-Lezana T. Parity conservation and polarization of differential cross sections in complex-forming chemical reactions. Phys Chem Chem Phys 2006; 8:3951-4. [PMID: 17028685 DOI: 10.1039/b608811b] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [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]
Abstract
For complex-forming chemical reactions, such as atom-diatom insertion reactions, quantum scattering and quantum statistical calculations usually predict sharp forward/backward peaks in the Differential Cross Sections (DCS). Conversely, the corresponding classical calculations are unable to reproduce these peaks. We show here that the basic reason for such an intriguing failure is that parity conservation is ignored in classical mechanics. A by-product of the analysis is a simple parity-restoring approximation that might significantly increase the ability of classical mechanics to describe DCSs over the whole angular range for the title processes.
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Affiliation(s)
- L Bonnet
- Laboratoire de Physico-Chimie Moléculaire, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France.
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