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This work has been supported by European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement 813211 (POEMA); An ideal of polynomials is symmetric if it is closed under permutations of variables. We relate general symmetric ideals to the so called Specht ideals generated by all Specht polynomials of a given shape. We show a connection between the leading monomials of polynomials in the ideal and the Specht polynomials contained in the ideal. This provides applications in several contexts. Most notably, this connection gives information about the solutions of the corresponding set of equations. From another perspective, it restricts the isotypic decomposition of the ideal viewed as a representation of the symmetric group.

International audience; Avant de se propager à l’échelle mondiale, l’épidémie de coronavirus est apparue dans la province du Hubei. Pour contenir la propagation du virus, le gouvernement chinois a imposé des mesures de quarantaine, entraînant un ralentissement de l’activité économique. Nous étudions ici la manière dont ce ralentissement de la production, initialement limité à la province de Hubei, se diffuse à l’économie mondiale via les chaînes de valeur internationales. La dépendance à l’égard des intrants chinois a augmenté de manière spectaculaire depuis le début des années 2000. De ce fait, la plupart des pays sont exposés au ralentissement de l’activité en Chine, à la fois directement via leurs importations de produits intermédiaires chinois et indirectement, du fait de la valeur ajoutée chinoise incorporée à d’autres intrants à la production. Cette note quantifie l’exposition totale de la France comparée à celle d’autres pays. Dans un premier temps, nous calculons la part de la valeur ajoutée chinoise dans la production française. Ensuite, nous utilisons des données au niveau des pays et des secteurs pour quantifier l’impact des mesures de quarantaine sur le PIB français.

Communiqué de presse dans la newsletter n° 9 du 08/09/2020 publié sur le site intranet de INRAE de Dijon.; Il y a peu de temps, la population française vivait une période inédite : neuf semaines confinées à la maison. Des chercheurs du CSGA se sont intéressées à l'impact du confinement sur les habitudes alimentaires en déployant une vaste enquête auprès de 500 parents d'enfants de 3-11 ans.

Publication parue dans RISIS Policy Brief Series Issue 6

Middleton, Carl et al. “Contested Knowledges of the Commons in Southeast Asia: Research Progress report - Vignettes from the Field”. Empirical Research Case Studies, Working Paper WP2 “The Environment”, March 2020. http://crisea.eu/wp-content/uploads/2020/04/Del-2.2WP2.pdf

Communication invitée au Workshop "low-dimensional thermoelectric nanomaterials", NANCY, FRANCE

International audience

On the occasion of International Archives Day, Dr Kathrin Meyer, Secretary General of the International Holocaust Remembrance Alliance (IHRA), and Dr Karel Berkhoff, Co-Director of the European Holocaust Research Infrastructure (EHRI) wrote a guest blog for the ARA (the Archives & Records Association) UK & Ireland, that seeks to raise awareness of the need for a broad approach to identifying Holocaust-related material – and offers practical tools that empower archivists and researchers to apply such an approach.

Members of the Nidoviralesorder have (+)RNA genomes amongstthe largest in size in the RNA virus world. Expression of their genes is promoted through reading of genomic RNA and mRNA transcripts by the ribosome of the infected cell. The 5'-end of these RNAs is supposedly protected by an RNA-cap structure (m7GpppNm) whose most synthesis steps remain elusive. In Eukaryotes, the RNA-cap structure is methylated by RNA methyltransferases (MTases) at the RNA-cap N7-guanine position as well as the 2'-O methyl position of the first transcribed nucleotide. In Coronaviridae, two separate enzymes (nsp14 and nsp16) perform the N7-guanine and the 2'-OH methylation, respectively. One salient feature of the Nidovirales N7-guanine MTase nsp14 is that it is the only example of non-Rossman fold viral MTase known so far. Conversely, all other Nidoviralesnsp16-like MTases have a canonical Rossman fold. Many Nidoviralesmembers lack either any RNA MTase signature sequence (e.g., Arteriviridae), or lack a N7-guanine MTase signature sequence (e.g., Tobaniviridae, Euroniviridae, Roniviridae, Medioniviridae). Both nsp14-and nsp16-like enzyme genes are usually located in Orf1b encoding for the replication machinery. Here, we report the discovery of a putative Rossman fold RNA MTase in the Orf1a of ten Tobaniviridaemembers. Multiple sequence alignments and structural analyses identify this novel gene as a typical RNA-cap N7-guanine MTase with substrate specificity and active-site organization similar to the canonical eukaryotic RNA-cap N7-guanine MTase.