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Your search keyword '"Stéphane Mazières"' showing total 11 results
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11 results on '"Stéphane Mazières"'

1. Chain Transfer Kinetics of Rhodixan® A1 RAFT/MADIX Agent

Author

Mathias Destarac, Aymeric Guinaudeau, Stéphane Mazières, and James Wilson

Subjects
xanthate, RAFT, radical polymerization, chain transfer, kinetics, Organic chemistry, QD241-441
Abstract

Rhodixan® A1 is the trade name for O-ethyl S-(1-methoxycarbonylethyl)dithiocarbonate, a RAFT/MADIX agent used by Syensqo to produce block copolymer additives for aqueous formulations on an industrial scale. Chain transfer coefficients to Rhodixan® A1 determined for 25 different styrenic, acrylate, and acrylamide monomers were relatively low (0.6 < Ctr < 3.8) and evolved in the following order: styrenics < acrylates < acrylamides. The corresponding interchain transfer coefficients followed the same trend (0.6 < Ctr,PnXA1 < 5.9). In all cases, polymers with predetermined Mn are obtained at high monomer conversion, with dispersities inversely proportional to Ctr,PnXA1 in most cases. With the added benefit of the established excellent reactivity of Rhodixan® A1 towards unconjugated monomers such as vinyl esters, diallyl, or N-vinyl monomers, RAFT/MADIX is a fantastic technological toolbox for tailor-making complex copolymers from monomers of highly disparate reactivities.

Published
2024
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3. Spectroscopic and electrochemical study of biomimetic catecholase and phenoxazinone synthase activities of in situ complexes bearing pyrazolic ligands

Author

Mohamed El Boutaybi, Abdeslam Mouadili, Adyl Oussaid, Stéphane Mazières, Rachid Touzani, Zahra Bahari, Faculté Polydisciplinaire de Taza, Université Sidi Mohamed Ben Abdellah - Fès [Université de Taza] (USMBA), Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), P3R - Polymères de Précision par Procédés Radicalaires (P3R), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), Faculté Pluridisciplinaire de Nador, Laboratoire de Chimie Appliquée et Environnement | Laboratory of Applied and Environmental Chemistry [Université Mohammed Premier Oujda] (LCAE), and Université Mohammed Premier [Oujda]

Subjects
[CHIM]Chemical Sciences, General Chemistry
Abstract

International audience

Published
2023
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4. Lactide-derived monomers for radical thiocarbonyl addition ring-opening copolymerisation

Author

Oleksandr Ivanchenko, Stéphane Mazières, Simon Harrisson, Mathias Destarac, Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), P3R - Polymères de Précision par Procédés Radicalaires (P3R), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), Institut Galien Paris-Sud (IGPS), and Université Paris-Sud - Paris 11 (UP11)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Polymers and Plastics, Organic Chemistry, [CHIM]Chemical Sciences, Bioengineering, Biochemistry
Abstract

The six-membered dl-thionolactide and dl-dithionolactide are reactive in radical ring-opening copolymerisation with a series of vinyl monomers to yield chemically degradable polymers.

Published
2022
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5. Ring size-reactivity relationship in radical ring-opening copolymerisation of thionolactones with vinyl pivalate

Author

Oleksandr Ivanchenko, Stéphane Mazières, Rinaldo Poli, Simon Harrisson, Mathias Destarac, Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), P3R - Polymères de Précision par Procédés Radicalaires (P3R), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), Laboratoire de chimie de coordination (LCC), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), and French Ministry of Higher Education, Research and Innovation

Subjects
Polymers and Plastics, Organic Chemistry, [CHIM]Chemical Sciences, Bioengineering, Biochemistry
Abstract

International audience; The radical ring-opening copolymerisation of unsubstituted thionolactones of different ring sizes has been investigated. DFT calculations and experimental results show the importance of the stabilization of the intermediate ring-retained radical.

Published
2022
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7. Frequency and characterization of RHD and RHCE variants in the Noir Marron population from French Guiana

Author

Laurine Laget, Caroline Izard, Elisabeth Durieux‐Roussel, Lugdivine Filosa, Pascal Bailly, Stéphane Mazières, Jacques Chiaroni, Etablissement Français du Sang Provence-Alpes Côte-d'Azur et Corse (EFS), Anthropologie bio-culturelle, Droit, Ethique et Santé (ADES), and Aix Marseille Université (AMU)-EFS ALPES MEDITERRANEE-Centre National de la Recherche Scientifique (CNRS)

Subjects
Suriname, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, [SHS.ANTHRO-BIO]Humanities and Social Sciences/Biological anthropology, Immunology, Culture, Immunology and Allergy, [SDV.MHEP.HEM]Life Sciences [q-bio]/Human health and pathology/Hematology, Hematology
Abstract

The RH system is one of the most polymorphic blood group systems due to the proximity and opposite orientation of RHD and RHCE genes. Numerous alleles are described and can affect Rh protein expression. This complexity is especially evident in populations of African origin. We performed RHD and RHCE genotyping of the Noir Marron population in French Guiana. This population belongs to the Maroon community who are direct descendants of African slaves, who escaped from Dutch plantations, in the current day Suriname, during the 17th century. They represent an original ethnic group with highly blended culture.A total of 89 DNA samples were collected from four different ethnic groups of the Noir Marron population of French Guiana. RHD and RHCE genotyping was performed using DNA microarray and/or sequencing.Significant allelic diversity was shown, with 45% of individuals presenting an RHD gene variant (most common: RHD*DAU, RHD*DIVa, and RHD*DIIIa allele) and 9.4% with a partial D phenotype. Likewise, 85% presenting an RHCE gene variant and 9% a partial RH2 antigen. One original allele was identified in two D+ Noir Marron individuals: a hybrid RHD*DIIIa-CE(9)-D allele, encoding probably a partial D antigen and associated with an RHCE*ce(48C,733G,1006T) allele. The African diversity of RHD and RHCE genes is found in this population with preserved genetic but mixed cultural backgrounds. These data allow us to describe the characteristics of the RH system antigen and highlights a significant number of partial antigens with a risk of alloimmunization.

Published
2022
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8. Impact of societal and legal context on the blood supply of African‐ancestry populations in Western countries: A review of practices and the French example

Author

Pauline Oviedo, Yannick Jaffré, Bruno Danic, Stéphane Mazières, Jacques Chiaroni, Anthropologie bio-culturelle, Droit, Ethique et Santé (ADES), Aix Marseille Université (AMU)-EFS ALPES MEDITERRANEE-Centre National de la Recherche Scientifique (CNRS), and Etablissement Français du Sang Provence-Alpes Côte-d'Azur et Corse (EFS)

Subjects
[SHS.ANTHRO-BIO]Humanities and Social Sciences/Biological anthropology, Black People, Blood Donors, Hematology, General Medicine, donor motivation, donor recruitment, ethics, United Kingdom, United States, Blood Group Antigens, Humans, anthropology, social norms, donors, Netherlands
Abstract

International audience; In Western countries, blood supply agencies encounter impediments in providing blood groups defined as rare or of interest, notably for sub-Saharan African ancestry (SSAA) recipients. To establish warning levels and anticipate future blood needs, an estimate of the current carriers of rare blood groups, both potential patients or donors, is crucial but complex. Indeed, if the strict needs can be estimated in medical terms, the modalities of blood product collection must be considered from an interdisciplinary perspective, at the interface of biological data and social norms. Here, we aim to understand how legal choices and a set of representations of otherness may influence the supply of rare blood for SSAA populations. After examining these issues, considering different norms and limits that govern French society, we compare this data with those of four Western countries facing the same difficulties (United States, United Kingdom, Italy and the Netherlands). This work began as part as the reflections of Social Lab, an institutional programme created by the French Blood Establishment (EFS). How can we effectively improve the qualitative blood coverage for SSAA populations? There is no unique solution, but there are many more or less effective answers. Comparison across countries reveals a strong influence of the socio-political histories and ethical choices before technical and medical considerations. We consider that an institutional policy is required to resolve recruitment issues of SSAA donors sustainably. Lastly, we introduce a working group called the EFS Social Lab, which aims to set up a monitoring mechanism for donors and societal trends to make blood donation effective.

Published
2022
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9. Five-Years Review of

Author

Pascal, Pedini, Lugdivine, Filosa, Nelly, Bichel, Christophe, Picard, Monique, Silvy, Jacques, Chiaroni, Caroline, Izard, Laurine, Laget, and Stéphane, Mazières

Subjects
Rh-Hr Blood-Group System, Gene Frequency, Haplotypes, Humans, Exons, Alleles
Abstract

Immunohematology laboratories are regularly facing transfusion issues due to serological weaknesses. Altered (partial) RH antigens account for most of them. In some situations

Published
2022

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