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Naik A, Smith EJ, Barreau A, Nyaeme M, Cramer SW, Najafali D, Krist DT, Arnold PM, Hassaneen W. Comparison of fluorescein sodium, 5-ALA, and intraoperative MRI for resection of high-grade gliomas: A systematic review and network meta-analysis. J Clin Neurosci 2022; 98:240-247. [PMID: 35219089 DOI: 10.1016/j.jocn.2022.02.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 12/22/2021] [Revised: 01/08/2022] [Accepted: 02/17/2022] [Indexed: 12/31/2022]
Abstract
High grade gliomas (HGGs) are aggressive brain tumors associated with poor prognosis despite advances in surgical treatment and therapy. Navigated tumor resection has yielded improved outcomes for patients. We compare 5-ALA, fluorescein sodium (FS), and intraoperative MRI (IMRI) with no image guidance to determine the best intraoperative navigation method to maximize rates of gross total resection (GTR) and outcomes. A frequentist network meta-analysis was performed following standard PRISMA guidelines (PROSPERO registration CRD42021268659). Surface-under-the-cumulative ranking (SUCRA) analysis was executed to hierarchically rank modalities by the outcomes of interest. Heterogeneity was measured by the I2 statistic. Publication bias was assessed by funnel plots and the use of Egger's test. Statistical significance was determined by p < 0.05. Twenty-three studies were included for analysis with a total of 2,643 patients. Network meta-analysis comparing 5-ALA, IMRI, and FS was performed. The primary outcome assessed was the rate of GTR. Analysis revealed the superiority of all intraoperative navigation to control (no navigation). SUCRA analysis revealed the superiority of IMRI + 5-ALA, IMRI alone, followed by FS, and 5-ALA. Overall survival (OS) and progression free survival (PFS) were also examined. FS (vs. control) was associated with improved OS, while IMRI was associated with improved PFS (vs. control, FS, and 5-ALA). Intraoperative navigation using IMRI, FS, and 5-ALA lead to greater rates of GTR in HGGs. FS and 5-ALA also yielded improvement in OS and PFS. Further studies are needed to evaluate differences in survival benefit, operative duration, and cost.
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Affiliation(s)
- Anant Naik
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States
| | - Emily J Smith
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States
| | - Ariana Barreau
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States
| | - Mark Nyaeme
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States
| | - Samuel W Cramer
- Department of Neurosurgery, University of Minnesota Twin-Cities, Minneapolis MN, 55455, United States
| | - Daniel Najafali
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States
| | - David T Krist
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States
| | - Paul M Arnold
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States; Department of Neurosurgery, Carle Foundation Hospital, Urbana IL 61801, United States
| | - Wael Hassaneen
- Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, IL 61820, United States; Department of Neurosurgery, Carle Foundation Hospital, Urbana IL 61801, United States.
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Caruso TJ, Fonseca A, Barreau A, Khoury M, Menendez M, Wang E, Lawrence K, Jackson C, Rodriguez S. Real-time reorientation and cognitive load adjustment allow for broad application of virtual reality in a pediatric hospital. J Clin Transl Res 2021; 7:750-753. [PMID: 34988325 PMCID: PMC8710353] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 08/11/2021] [Accepted: 09/29/2021] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND With a new generation of affordable portable virtual reality (VR), clinicians are discovering more utility for VR, while also identifying opportunities for improvement, such as the inability to reorient the horizon line during repositioning or transport, or modulate cognitive load in real time. AIM At our institution, this lack of functionality prohibited or decreased VR usage in some clinical scenarios such as dressing changes with dynamic positioning. The purpose of this brief report is to describe the development and use of a VR application that is optimized for the healthcare setting and report historical effects of patients who utilized VR as supplement to Child Life procedures. Eligible affects per chart review included Happy, Relaxed, Anxious, Distressed, Unable to Assess. MATERIALS AND METHODS Given the need for real-time reorientation and cognitive load modulation, we created the Space Pups™ VR application. The experience was launched as part of the Stanford Chariot Program in the summer of 2017, and its usage was tracked through the electronic medical record and a VR application dashboard. Chart review was queried from 3 January 2018 to 9 August 2021 for pediatric patients who used VR with real-time reorientation and cognitive load modulation as a supplement to their Child Life interventions. RESULTS The Space Pups™ experience has been successfully used in a variety of settings, including perioperative care, vascular access, wound care, and ENT clinic, a total of 1696 times. Patients ranged from 6 years to 18-year old, with no reports of side effects. Significant results (P<0.001) were observed pre- and post-VR use for affect improvements in Happy, Relaxed, and Anxious, but not for Distressed. CONCLUSIONS The ability to reorient VR experiences in real time has increased functionality where other applications have failed. RELEVANCE FOR PATIENTS While more studies are needed to quantify the anxiolytic and pain-reducing effect of Space Pups™, our report demonstrates the feasibility of this VR experience as a non-pharmacological modality to safely increase patient cooperation in a wide variety of clinical settings.
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Affiliation(s)
- Thomas J. Caruso
- 1Department of Anesthesiology, Perioperative, and Pain Medicine, Stanford University School of Medicine, Stanford, CA, 94304, USA,Corresponding author: Thomas J. Caruso Department of Anesthesiology, Perioperative, and Pain Medicine. Stanford University School of Medicine. Stanford, CA, 94304, USA. E-mail:
| | - Ahtziri Fonseca
- 2Stanford Chariot Program, Lucile Packard Children’s Hospital, Palo Alto, CA, 94305, USA
| | - Ariana Barreau
- 2Stanford Chariot Program, Lucile Packard Children’s Hospital, Palo Alto, CA, 94305, USA
| | - Michael Khoury
- 2Stanford Chariot Program, Lucile Packard Children’s Hospital, Palo Alto, CA, 94305, USA
| | - Maria Menendez
- 2Stanford Chariot Program, Lucile Packard Children’s Hospital, Palo Alto, CA, 94305, USA
| | - Ellen Wang
- 1Department of Anesthesiology, Perioperative, and Pain Medicine, Stanford University School of Medicine, Stanford, CA, 94304, USA
| | - Kiley Lawrence
- 3Department of Anesthesiology, Perioperative, and Pain Medicine. Massachusetts General Hospital. Boston, MA, 02114, USA
| | - Christian Jackson
- 2Stanford Chariot Program, Lucile Packard Children’s Hospital, Palo Alto, CA, 94305, USA
| | - Samuel Rodriguez
- 1Department of Anesthesiology, Perioperative, and Pain Medicine, Stanford University School of Medicine, Stanford, CA, 94304, USA
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Abstract
Intrinsically disordered regions (IDRs) are often fast-evolving protein domains of low sequence complexity that can drive phase transitions and are commonly found in many proteins associated with neurodegenerative diseases, including the RNA processing factor TDP43. Yet, how phase separation contributes to the physiological functions of TDP43 in cells remains enigmatic. Here, we combine systematic mutagenesis guided by evolutionary sequence analysis with a live-cell reporter assay of TDP43 phase dynamics to identify regularly-spaced hydrophobic motifs separated by flexible, hydrophilic segments in the IDR as a key determinant of TDP43 phase properties. This heuristic framework allows customization of the material properties of TDP43 condensates to determine effects on splicing function. Remarkably, even a mutant that fails to phase-separate at physiological concentrations can still efficiently mediate the splicing of a quantitative, single-cell splicing reporter and endogenous targets. This suggests that the ability of TDP43 to phase-separate is not essential for its splicing function.
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Affiliation(s)
| | - Ariana Barreau
- Department of Biochemistry, Stanford School of Medicine, Stanford, CA, 94305, USA
| | - Rajat Rohatgi
- Department of Biochemistry, Stanford School of Medicine, Stanford, CA, 94305, USA.
- Department of Medicine, Stanford School of Medicine, Stanford, CA, 94305, USA.
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Thomas E, Bertolotti A, Barreau A, Klisnick J, Tournebize P, Borgherini G, Zemali N, Jaubert J, Jouvion G, Bretagne S, Picot S. From phaeohyphomycosis to disseminated chromoblastomycosis: A retrospective study of infections caused by dematiaceous fungi. Med Mal Infect 2018; 48:278-285. [PMID: 29656841 DOI: 10.1016/j.medmal.2017.09.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 07/13/2016] [Revised: 10/30/2016] [Accepted: 09/12/2017] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Infections caused by dematiaceous fungi are more common in tropical and subtropical areas. We aimed to describe the clinical, microbiological and therapeutic aspects of case patients diagnosed at a University Hospital located on an Indian Ocean island. PATIENTS AND METHODS We performed an observational retrospective study of infections caused by dematiaceous fungi diagnosed at the University Hospital of Saint-Pierre, Reunion, from 2000 to 2015. Mycological identifications were performed at the National Reference Center for Invasive Mycosis and Antifungal Agents (Paris). RESULTS The review of clinical and microbiological data of 11 patients identified revealed that five were infected by dematiaceous fungi. Two had cutaneous phaeohyphomycosis, two had cerebral phaeohyphomycosis and one had cutaneous chromoblastomycosis with brain and potentially medullary dissemination. Skin lesions and cerebral abscesses were quite varied. CONCLUSION Infections caused by dematiaceous fungi are rare. Medullary and brain localizations are extremely rare, especially for chromoblastomycosis. Cutaneous manifestations of phaeohyphomycosis are varied; diagnosis is thus more difficult. It is therefore important, when confronted with a chronic tumor-like lesion in endemic areas, to perform a biopsy for pathology and fungal culture. While surgical excision is not always sufficient, medical treatment of these infections is not standardized, but relies on an azole, which can be associated with another antifungal agent.
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Affiliation(s)
- E Thomas
- Service de bactériologie, virologie, parasitologie, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - A Bertolotti
- Service de maladies infectieuses, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - A Barreau
- Service de bactériologie, virologie, parasitologie, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - J Klisnick
- Service de maladies infectieuses, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - P Tournebize
- Service de neurologie, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - G Borgherini
- Service de maladies infectieuses, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - N Zemali
- Service de bactériologie, virologie, parasitologie, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - J Jaubert
- Service de bactériologie, virologie, parasitologie, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion
| | - G Jouvion
- Institut Pasteur, histopathologie humaine et modèles animaux, 28, rue du Docteur-Roux, 75015 Paris, France
| | - S Bretagne
- Institut Pasteur, centre national de référence des mycoses invasives et des antifongiques, 28, rue du Docteur-Roux, 75015 Paris, France
| | - S Picot
- Service de bactériologie, virologie, parasitologie, centre hospitalier universitaire de La Réunion, site Sud, BP 350, 97448 Saint-Pierre cedex, Reunion.
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Sakka S, Gaboriau R, Picard J, Redois E, Parchantour G, Sarfaty L, Navarro S, Barreau A. Rob’Autism: How to Change Autistic Social Skills in 20 Weeks. New Trends in Medical and Service Robots 2018. [DOI: 10.1007/978-3-319-59972-4_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Thomas E, Bertolotti A, Barreau A, Klisnick J, Tournebize P, Borgherini G, Zemali N, Jouvion G, Bretagne S, Picot S. IPF-07 - De la phaeohyphomycose disséminée à la chromoblastomycose : une étude rétrospective sur 15 ans. Med Mal Infect 2016. [DOI: 10.1016/s0399-077x(16)30426-7] [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: 10/21/2022]
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Barreau A, Brunella I, de Hemptinne JC, Coupard V, Canet X, Rivollet F. Measurements of Liquid−Liquid Equilibria for a Methanol + Glycerol + Methyl Oleate System and Prediction Using Group Contribution Statistical Associating Fluid Theory. Ind Eng Chem Res 2010. [DOI: 10.1021/ie901379x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [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)
- A. Barreau
- IFP, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, IFP-Lyon, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France, and Processium, 62 boulevard Niels Bohr, BP 2132, 69603 Villeurbanne Cedex, France
| | - I. Brunella
- IFP, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, IFP-Lyon, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France, and Processium, 62 boulevard Niels Bohr, BP 2132, 69603 Villeurbanne Cedex, France
| | - J.-C. de Hemptinne
- IFP, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, IFP-Lyon, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France, and Processium, 62 boulevard Niels Bohr, BP 2132, 69603 Villeurbanne Cedex, France
| | - V. Coupard
- IFP, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, IFP-Lyon, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France, and Processium, 62 boulevard Niels Bohr, BP 2132, 69603 Villeurbanne Cedex, France
| | - X. Canet
- IFP, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, IFP-Lyon, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France, and Processium, 62 boulevard Niels Bohr, BP 2132, 69603 Villeurbanne Cedex, France
| | - F. Rivollet
- IFP, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, IFP-Lyon, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France, and Processium, 62 boulevard Niels Bohr, BP 2132, 69603 Villeurbanne Cedex, France
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Youssef Z, Barreau A, Mougin P, Jose J, Mokbel I. Measurements of Hydrate Dissociation Temperature of Methane, Ethane, and CO2 in the Absence of Any Aqueous Phase and Prediction with the Cubic Plus Association Equation of State. Ind Eng Chem Res 2009. [DOI: 10.1021/ie801351e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [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)
- Z. Youssef
- Institut Francais du Pétrole, 1-4 Avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, and UMR 5180, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - A. Barreau
- Institut Francais du Pétrole, 1-4 Avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, and UMR 5180, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - P. Mougin
- Institut Francais du Pétrole, 1-4 Avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, and UMR 5180, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - J. Jose
- Institut Francais du Pétrole, 1-4 Avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, and UMR 5180, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - I. Mokbel
- Institut Francais du Pétrole, 1-4 Avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France, and UMR 5180, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
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Barreau A, Vidal J, Mogensen J. Sobaric Heat Capacity Calculation of Light Hydrocarbons by Means of Equations of State. ACTA ACUST UNITED AC 2006. [DOI: 10.2516/ogst:1993030] [Citation(s) in RCA: 5] [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: 11/06/2022]
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Affiliation(s)
- L. Ruffine
- Institut Français du Pétrole, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France
| | - P. Mougin
- Institut Français du Pétrole, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France
| | - A. Barreau
- Institut Français du Pétrole, 1-4 avenue de Bois Préau, 92852 Rueil-Malmaison Cedex, France
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Tounsi KNH, Barreau A, Le Corre E, Mougin P, Neau E. Measurement of Carbon Dioxide Solubility in a Solution of Diethanolamine Mixed with Methanol. Ind Eng Chem Res 2005. [DOI: 10.1021/ie0580250] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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)
- K. N. Habchi Tounsi
- Institut Français du Pétrole Département Thermodynamique et Simulation Moléculaire, 1 et 4 avenue de Bois Préau, 92850 Rueil-Malmaison Cedex, France, and Faculté des Sciences de Luminy, Laboratoire de ChimiePhysique, 163 avenue de Luminy case 901, 13288 Marseille Cedex 9, France
| | - A. Barreau
- Institut Français du Pétrole Département Thermodynamique et Simulation Moléculaire, 1 et 4 avenue de Bois Préau, 92850 Rueil-Malmaison Cedex, France, and Faculté des Sciences de Luminy, Laboratoire de ChimiePhysique, 163 avenue de Luminy case 901, 13288 Marseille Cedex 9, France
| | - E. Le Corre
- Institut Français du Pétrole Département Thermodynamique et Simulation Moléculaire, 1 et 4 avenue de Bois Préau, 92850 Rueil-Malmaison Cedex, France, and Faculté des Sciences de Luminy, Laboratoire de ChimiePhysique, 163 avenue de Luminy case 901, 13288 Marseille Cedex 9, France
| | - P. Mougin
- Institut Français du Pétrole Département Thermodynamique et Simulation Moléculaire, 1 et 4 avenue de Bois Préau, 92850 Rueil-Malmaison Cedex, France, and Faculté des Sciences de Luminy, Laboratoire de ChimiePhysique, 163 avenue de Luminy case 901, 13288 Marseille Cedex 9, France
| | - E. Neau
- Institut Français du Pétrole Département Thermodynamique et Simulation Moléculaire, 1 et 4 avenue de Bois Préau, 92850 Rueil-Malmaison Cedex, France, and Faculté des Sciences de Luminy, Laboratoire de ChimiePhysique, 163 avenue de Luminy case 901, 13288 Marseille Cedex 9, France
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Ruffine L, Barreau A, Brunella I, Mougin P, Jose J. New Apparatus for Low-Temperature Investigations: Measurements of the Multiphase Equilibrium of Mixtures Containing Methane, Ethane, Propane, Butane, Methanol, and Carbon Dioxide. Ind Eng Chem Res 2005. [DOI: 10.1021/ie0506365] [Citation(s) in RCA: 11] [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: 11/29/2022]
Affiliation(s)
- L. Ruffine
- Institut Français du Pétrole, 1−4 avenue de bois Préau, 92852 Rueil-Malmaison Cedex, France, and Université Claude Bernard de Lyon I, 43 bvd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - A. Barreau
- Institut Français du Pétrole, 1−4 avenue de bois Préau, 92852 Rueil-Malmaison Cedex, France, and Université Claude Bernard de Lyon I, 43 bvd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - I. Brunella
- Institut Français du Pétrole, 1−4 avenue de bois Préau, 92852 Rueil-Malmaison Cedex, France, and Université Claude Bernard de Lyon I, 43 bvd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - P. Mougin
- Institut Français du Pétrole, 1−4 avenue de bois Préau, 92852 Rueil-Malmaison Cedex, France, and Université Claude Bernard de Lyon I, 43 bvd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - J. Jose
- Institut Français du Pétrole, 1−4 avenue de bois Préau, 92852 Rueil-Malmaison Cedex, France, and Université Claude Bernard de Lyon I, 43 bvd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
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Tournier H, Barreau A, Tavitian B, Roux DL, Moïse JC, Bellat JP, Paulin C. Adsorption Equilibrium of Xylene Isomers and p-Diethylbenzene on a Prehydrated BaX Zeolite. Ind Eng Chem Res 2001. [DOI: 10.1021/ie0011371] [Citation(s) in RCA: 29] [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: 11/28/2022]
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Abstract
We describe an innovative yet straightforward method to obtain high quality thin sections of diatom exoskeletons for observation by scanning electron microscopy (SEM). The use of this new technique allows for clear observations of some ultrastructural valve features, including the raphe, which are generally difficult to observe and describe accurately using transmission electron microscopy analysis of thin sections or SEM of randomly fractured diatom valves. In addition, because this method involves the complete removal of the organic content of the diatom cells, resulting in clean and mostly undisturbed skeletal thin cross-sections, even the intact valvar structures of weak girdle bands can be studied.
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Affiliation(s)
- G Massé
- Laboratoire de Biologie Marine, ISOMer, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes Cedex 3, France.
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Napo K, Safoula G, Bernède J, D'Almeida K, Touirhi S, Alimi K, Barreau A. Influence of the iodine doping process on the properties of organic and inorganic polymer thin films. Polym Degrad Stab 1999. [DOI: 10.1016/s0141-3910(99)00075-0] [Citation(s) in RCA: 3] [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] [Indexed: 10/17/2022]
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Barreau A, Chave A, Dumon B, Thibeau M, Ladanyi B. Effects of intermolecular interactions on depolarized Rayleigh scattering intensities of fluids of linear molecules. Mol Phys 1989. [DOI: 10.1080/00268978900101791] [Citation(s) in RCA: 3] [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] [Indexed: 10/24/2022]
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17
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Durand JP, Fafet A, Barreau A. Direct and automatic capillary GC analysis for molecular weight determination and distribution in crude oils and condensates up to C20. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/jhrc.1240120408] [Citation(s) in RCA: 15] [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: 11/07/2022]
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Ladanyi BM, Barreau A, Chave A, Dumon B, Thibeau M. Collision-induced light scattering by fluids of optically isotropic molecules: Comparison of results of two model studies. Phys Rev A Gen Phys 1986; 34:4120-4130. [PMID: 9897757 DOI: 10.1103/physreva.34.4120] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bourg M, Vanhoove D, Barreau A, Faidherbe D. [The wife of the alcoholic sailor. An attempt at an ethno-socio-psychiatric understanding of alcoholism in a Breton marine environment]. Ann Med Psychol (Paris) 1981; 139:1014-23. [PMID: 7337335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Sellier R, Barreau A. [Use of a new process of metallic shadowing by cathodic vaporization for scanning electron microscopy of tegumental products of insects]. C R Acad Hebd Seances Acad Sci D 1977; 285:1053-6. [PMID: 74296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In scanning electron microscopy, the recent process, not yet much used, of coating subjects with gold by cathodic sputtering, allows one in biology and especially in entomology, to visualize microreliefs, habitually masked, when the old technique called evaporating technique, was used. This process effectively allows one to deposit a very much thinner layer of metal and, because it is performed at room temperature, prevents artifacts caused by the high temperature necessitated by the other technique, whose previous results nevertheless remain generally correct.
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