175,367 research outputs found
Barbier-Type Nitro/Nitroso Addition Polymerization as a Versatile Approach for Molecular Design of Polyarylamines through CN Bond Formation
No full textThe
doping of a polymer chain with nitrogen is an efficient strategy
to endow polymer materials with functionality. However, the molecular
design of polyarylamines through direct C–N bond formation
is still challenging. Herein, a novel polymerization method, named
Barbier-type nitro/nitroso addition polymerization, is reported as
a versatile approach for molecular design of polyarylamines through
C–N bond formation, by utilizing electrophilic nitro/nitroso
groups as polymerizable groups. Through Barbier-type nitro/nitroso
addition polymerization, a series of polyarylamines have been prepared,
including ortho-polyaniline, para-polyaniline, meta-polyaniline, para-polymethylaniline, and polynaphthylamine, most of which are hard
to be synthesized by current other polymerization methods. By introducing
the Barbier-type nitro/nitroso addition into polymer chemistry, the
polymerization methodology, monomer, and polymer libraries of polymer
chemistry are expanded and a novel avenue is opened up for molecular
design of nitrogen-containing polymer materials through direct formation
of a C–N bond
ThermoMechaLimestone
No full textThis data set gives nearly 5 years of temperature and displacements recorded on and in a limestone cliff. An extensive presentation of the monitoring device can be found in (Gasc-Barbier et al., 2020, 2015) and is summarized below. Interpretation of data is proposed in Gasc-Barbier et al. (submitted)
Instrum.jpg display the hazard zone. We can see a perched cave in a limestone cliff where a part of its roof had collapsed. On its roof an unstable beam reminds. This remaining beam is delimited by a horizontal interlayer thinning from East to West, hanging to the roof of the cave at the west and east-clamped in the rock mass. Opened fractures can be observed all around the beam. In order to assess the remaining hazard, 4 fissurometers (F1 to F4) and a thermal probe were installed on the roof of the cave and two borehole extensometers (D1 and D2) were drilled perpendicular to the face of the cliff, above the cave, to understand the global behaviour of the rock mass.
The four fissurometers were positioned around the remaining beam to quantify the aperture of the joints, in order to evaluate the relative movement of the blocks, according to changes in external conditions: F1 near the east-clamped end of the beam, and the three others on the west part: Two of them (F3 and F4) were fixed across a horizontal joint and a vertical joint respectively, F2 is positioned across the vertical joint in a 45° angle. The thermal probe was fixed on the roof of the cavity near the three. Fissurometers are LVDT strain gauges that measure displacements between their two extremes with a resolution of 1/10 th mm. DATA-Fissuromètres gives a record per hour.
The borehole extensometers (D1 & D2) are RockTest / Télémac distofor@ anchored in the rock mass at the end of the borehole at a depth of 8 m from the cliff wall. Both were prepared with three displacement measuring points at depths of 2 m, 4 m and 6 m from the cliff wall and temperature measuring points at 2 m and 6 m depth. The supplier gives a measuring range of 100 mm, a resolution lower than 0.01 mm. Given the length of the rods used (8 m), the precision is about 0.05 mm. The operating temperature must remain between 0° and 50 °C. The devices were placed perpendicular to the rock face, about 4 m and 7.5 m above the roof of the cave cavity (see Gasc-Barbier et al. submitted). DATA_Extenso.xls gives a record per hour.
Measurements lasts between July 2010 until April 2015. They were stopped when reinforcement works were proceeded in the cave in order to secure the village.
Gasc-Barbier et al, 2020 https://doi.org/10.1051/geotech/2020013
Gasc-Barbier, M., Virely, D., Guittard, J., 2015. Thermal fatigue in rocks- la roque-gageac’ case study, in: 13th ISRM International Congress of Rock Mechanics. Montreal, Canada.
Gasc-Barbier, M., Merrien-Soukatchoff, Virely, D. submitted. The role of natural thermal cycles on a limestone cliff mechanical behaviour. Submitted to Engineering Geology
Faust E Margherita : A Grand Romantic Opera In Five Actes ; [Royal Italian Opera, Covent Garden] / The Libretto By J. Barbier And M. Carre. The Music By C. Gounod
No full textFAUST E MARGHERITA : A GRAND ROMANTIC OPERA IN FIVE ACTES ; [ROYAL ITALIAN OPERA, COVENT GARDEN] / THE LIBRETTO BY J. BARBIER AND M. CARRE. THE MUSIC BY C. GOUNOD
Faust E Margherita : A Grand Romantic Opera In Five Actes ; [Royal Italian Opera, Covent Garden] / The Libretto By J. Barbier And M. Carre. The Music By C. Gounod (1)
Cover (1)
Titelseite (5)
Argument (7)
Dramatis Personae (9)
Atto I. / Act I. (12)
Atto II. / Act II. (22)
Atto III. / Act III. (38)
Atto IV. / Act IV. (62)
Atto V. / Act V. (78
Faust : Dramma Lirico In Cinque Atti / Dei Signori J. Barbier E M. Carré. Traduzione italiana del signor Achille de Lauzières. Musica di C. Gounod
No full textFAUST : DRAMMA LIRICO IN CINQUE ATTI / DEI SIGNORI J. BARBIER E M. CARRÉ. TRADUZIONE ITALIANA DEL SIGNOR ACHILLE DE LAUZIÈRES. MUSICA DI C. GOUNOD
Faust : Dramma Lirico In Cinque Atti / Dei Signori J. Barbier E M. Carré. Traduzione italiana del signor Achille de Lauzières. Musica di C. Gounod (1)
Cover (1)
Titelseite (5)
Personaggi (7)
Atto Primo (9)
Atto Secondo (15)
Atto Terzo (24)
Atto Quarto (38)
Atto Quinto (49
H. Van Looy, C. Iulius Caesar. De Bello Gallico, uitgegeven en voorbereid
No full textBarbier G. H. Van Looy, C. Iulius Caesar. De Bello Gallico, uitgegeven en voorbereid. In: L'antiquité classique, Tome 22, fasc. 1, 1953. p. 190
Faust : Dramma Lirico In Cinque Atti ; Da Rappresentarsi Al Teatro Communale Di Trieste Stagione di Autunno 1864 / Dei Signori J. Barbier e M. Carré. Traduzione italiana del signor Achille de Lauzières. Musica Del Maestro C. Gounod
No full textFAUST : DRAMMA LIRICO IN CINQUE ATTI ; DA RAPPRESENTARSI AL TEATRO COMMUNALE DI TRIESTE STAGIONE DI AUTUNNO 1864 / DEI SIGNORI J. BARBIER E M. CARRÉ. TRADUZIONE ITALIANA DEL SIGNOR ACHILLE DE LAUZIÈRES. MUSICA DEL MAESTRO C. GOUNOD
Faust : Dramma Lirico In Cinque Atti ; Da Rappresentarsi Al Teatro Communale Di Trieste Stagione di Autunno 1864 / Dei Signori J. Barbier e M. Carré. Traduzione italiana del signor Achille de Lauzières. Musica Del Maestro C. Gounod (1)
Cover (1)
Title page (3)
Titelseite (5)
Personaggi (7)
Atto Primo (9)
Atto Secondo (15)
Atto Terzo (24)
Atto Quarto (38)
Atto Quinto (49
Faust : Dramma Lirico In Cinque Atti ; Da rappresentarsi Al Teatro Carlo Felice Di Genova Il Carnevale 1863-64 / Dei Signori J. Barbier e M. Carré. Traduzione italiana del signor Achille de Lauzières. Musica Del Maestro C. Gounod
No full textFAUST : DRAMMA LIRICO IN CINQUE ATTI ; DA RAPPRESENTARSI AL TEATRO CARLO FELICE DI GENOVA IL CARNEVALE 1863-64 / DEI SIGNORI J. BARBIER E M. CARRÉ. TRADUZIONE ITALIANA DEL SIGNOR ACHILLE DE LAUZIÈRES. MUSICA DEL MAESTRO C. GOUNOD
Faust : Dramma Lirico In Cinque Atti ; Da rappresentarsi Al Teatro Carlo Felice Di Genova Il Carnevale 1863-64 / Dei Signori J. Barbier e M. Carré. Traduzione italiana del signor Achille de Lauzières. Musica Del Maestro C. Gounod (1)
Cover (1)
Titelseite (5)
Personaggi (7)
Atto Primo (9)
Atto Secondo (15)
Atto Terzo (24)
Atto Quarto (38)
Atto Quinto (49
Mechanochemistry-Amended Barbier Reaction as an Expedient Alternative to Grignard Synthesis
No full textOrganomagnesium halides (Grignard reagents) are essential carbanionic building blocks widely used in carbon-carbon and carbon-heteroatom bond-forming reactions with various electrophiles. In the Barbier variant of the Grignard synthesis, the generation of air- and moisture-sensitive Grignard reagents occurs concurrently with their reaction with an electrophile. Although operationally simpler, the classic Barbier approach suffers from low yields due to multiple side reactions, thereby limiting the scope of its application. Here, we report a mechanochemical adaptation of the Mg-mediated Barbier reaction, which overcomes these limitations and facilitates the coupling of versatile organic halides (e.g., allylic, vinylic, aromatic, aliphatic) with a diverse range of electrophilic substrates (e.g., aldehydes, ketones, esters, amides, O-benzoyl hydroxylamine, chlorosilane, borate ester) to assemble C–C, C–N, C–Si, and C–B bonds. In contrast to the classic two-step Grignard synthesis, the mechanochemical approach has the advantage of being essentially solvent-free, single step, operationally simple, immune to air, and surprisingly tolerant to water and other proton donors. Mechanistic studies have clarified the role of mechanochemistry in the process, indicating that the reaction predominantly proceeds via the generation of transient organometallics, which occurs rapidly due to improved mass transfer and activation of the surface of magnesium meta
Evaluation de la cytotoxicité de la roquefortine C et de l’acide mycophénolique, et quantification de ces mycotoxines dans des fromages à pâte persillée par LC-MS/MS
No full textEvaluation de la cytotoxicité de la roquefortine C et de l’acide mycophénolique, et quantification de ces mycotoxines dans des fromages à pâte persillée par LCMS/MS
Fontaine Kévin1, Hymery Nolwenn1, Mounier Jérôme1, Passero Elena2, Vallone Lisa2, Barbier Georges1, Coton Emmanuel1
La fabrication des fromages à pâte persillée (bleus, gorgonzola, stilton...) implique l’utilisation de souches sélectionnées de P. roqueforti qui jouent un rôle prépondérant dans les qualités organoleptiques de ces produits. En outre, P. roqueforti possède un potentiel de production de métabolites secondaires tels que la roquefortine C (ROQ C), les isofumigaclavines A et B, la toxine PR et l’acide mycophénolique (AM). A l’heure actuelle, il existe des données parcellaires concernant leur cytotoxicité et leur présence dans les fromages.
L’objectif de ce travail a été une analyse quantitative de la ROQ C et de l’AM effectuée dans 76 fromages à pâte persillée issus d’une quinzaine de pays différents, par chromatographie liquid couplée à la spectrométrie de masse en tandem (LC-MS/MS)
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