Glyconanocapsules with a biocompatible oily core have been successfully prepared by copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) interfacial step growth polymerization between ...6,6′-diazido-6,6′-dideoxysucrose and bis(propargyloxy)butane in oil-in-water miniemulsion conditions. Optimization of the interfacial polymerization process in dispersed medium afforded the rapid and reproducible preparation of stable monodispersed glyconanocapsules having a diameter around 200 nm.
Poly(vinyl acetate) combs have been prepared via macromolecular design via interchange of xanthate (MADIX)/reversible addition–fragmentation chain-transfer (RAFT) polymerization using xanthate ...functionalized polymer cores. The comb backbones were prepared using well-defined poly(vinyl alcohol) PVA polymers with a degree of polymerization of 20, 100 and 170, respectively. Functionalization with xanthates via R-group or a Z-group approach resulted in the formation of macromolecular MADIX agents. While Z group designed macromolecular xanthate agents appeared to inhibit the polymerization of vinyl acetate (VAc), R group designed macromolecular xanthate agents achieved to mediate efficiently the bulk polymerization of VAc affording PVAc combs. However, the growth of the combs was accompanied at low conversions by the formation of linear polymer chains as a result of the constant initiation (AIBN) and shoulders, which can be attributed to intermolecular coupling reactions. The proportions of single chains and termination products were observed to increase with the degree of polymerization of the macromolecular MADIX agents broadening the molecular weight distribution. As a result of a stable ester link between the branches and the PVA backbone, the branched PVAc architectures were finally hydrolyzed to afford poly(vinyl alcohol) combs.
Cet article analyse le rapport à la ritualité funéraire dans le cas du don de corps à la science, où toute possibilité de rituel en présence du corps et dans des lieux de mémoire personnalisés est ...souvent annulée. L’article montre l’hétérogénéité des représentations des donateurs, de leurs proches et des établissements receveurs, à propos du don du corps, de la ritualité funéraire et du statut anthropologique du corps mort. L’importance de cérémonies et de lieux de mémoire est réaffirmée mais nuancée devant les premiers bilans des initiatives rituelles et les discours contrastés des intéressés.
Cet article analyse le rapport à la ritualité funéraire dans le cas du don de corps à la science, où toute possibilité de rituel en présence du corps et dans des lieux de mémoire personnalisés est ...souvent annulée. L'article montre l'hétérogénéité des représentations des donateurs, de leurs proches et des établissements receveurs, à propos du don du corps, de la ritualité funéraire et du statut anthropologique du corps mort. L'importance de cérémonies et de lieux de mémoire est réaffirmée mais nuancée devant les premiers bilans des initiatives rituelles et les discours contrastés des intéressés
Becker–Blaschke problem of space Bernard, Julien
Studies in History and Philosophy of Modern Physics,
November 2015, 2015-11-00, Letnik:
52
Journal Article
Recenzirano
In a letter to Weyl, Becker proposed a new way to solve the problem of space in the relativistic context. This is the result of Becker׳s encounter with the two traditions of thinking about space: ...Husserlian transcendental phenomenology and Blaschke׳s equiaffine differential geometry. I reconstruct the mathematical content of the Becker–Blaschke solution to the problem of space and highlight the philosophical ideas that guide this construction. This permits me to underline some common properties of Riemannian and Minkowskian manifolds in terms of an unusual notion of isotropy. Finally, I will use this construction as a support to analyze several philosophical differences between Weyl׳s and Becker׳s proposals.
•I reconstruct Becker–Blaschke problem of space.•This gives new insights on the geometrical foundations of relativity theories.•Becker and Weyl differently connect the infinitesimal and finite levels of space.•Becker and Weyl disagree on the role of isotropy in relativity theories.
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