13 research outputs found
SynthÚse de thiazoloquinazolinones angulaires N-Alkylees à visée thérapeutique
The protein kinases constitute an important family involved in numerous cellular functions. So it s an important target for the potential therapeutic interest. In order to obtain new inhibitor family, the multistep synthesis of : 8-substituted-9-oxo-8,9-dihydrothiazolo[5,4-f]- quinazoline -2- carbonitrile, 7-substituted-6-oxo-6,7-dihydro-thiazolo[4,5-h]-quinazoline-2-carbonitril 8-substituted-9-oxo-8, 9-dihydrothiazolo[5,4-f]-quinazoline-2,7-dicarbonitrile was investigated. This compounds were prepared via the 4,5-dichloro-1,2,3-dithiazolium chloride chemistry. And the synthesis was optimized under micro-wave irradiation. The inhibition of Cyclin Dependant Kinase (CDKs) and Glycogen Synthase Kinase 3 (GSK-3) was evaluated. Moreover, a structure activity relationship was determined with molecular modeling.LA ROCHELLE-BU (173002101) / SudocSudocFranceF
Elucidating non-classical nucleation of nanocrystals from an amorphous intermediate state
International audienceWhile nanoparticles are attractive because of their peculiar properties, their production remains a challenge. Their attributes mostly depend on size and surface state, but also on their microstructure. However, this structure (size, shape, porosity, crystalline quality) is currently only controlled via trial-error experimentations and poorly described by the only tool available, the classical nucleation theory (CNT), especially for oxide nanoparticles synthesised in water. Luminescent, europium-doped yttrium vanadate (YVO: Eu) illustrates nicely how important tuning the properties at the nanometric scale is. For light emission applications, a good crystalline quality and low surface to volume ratio is required, whereas porosity and high surface area will be key for chemical sensor applications. This branching makes it crucial to understand the mechanisms of formation of these objects in order to have precise control on their structure and thus on their properties. In this work, we focused on elucidating how crystalline YVO4 is formed in water. A first striking result is that tuning the initial pH leads to two critical microstructures : (i) the "expected" [4], porous, one, with nanoparticles ~20nm wide composed of subunits of 2nm, (ii) a new, monocrystalline-like one, with particles 30nm large and no primary unit detected. To understand this difference, we conducted luminescence, pH, ICP-MS, and SAXS/WAXS/XRD studies during the reaction from reaction times as short as 5ms. In particular, we could show the existence of an amorphous intermediate state in both cases and its impact on the particles' size and microstructure, and measure nucleation rates within the disordered network to improve nucleation theories
Novel 9-oxo-thiazolo[5,4-f]quinazoline-2-carbonitrile derivatives as dual cyclin-dependent kinase 1 (CDK1)/glycogen synthase kinase-3 (GSK-3) inhibitors: Synthesis, biological evaluation and molecular modeling studies
International audienc
Microwave-assisted Synthesis of Novel Thiazolocarbazoles and Evaluation as Potential Anticancer Agents. Part III
International audienc
Synthesis and evaluation of the antiproliferative activity of novel thiazoloquinazolinone kinases inhibitors.
International audienceThe microwave-assisted synthesis of a family of 2,8-substituted thiazoloquinazolinones is described. The preliminary evaluation of the antiproliferative activity and the capacity of these molecules to inhibit CDKs and GSK-3 are reported. A lead compound was identified, constituting a scaffold from which more potent inhibitors could be designed
Thiazolo[5,4-f]quinazolin-9-ones, inhibitors of glycogen synthase kinase-3
International audienc
Transient dense phases in the nucleation/growth of nanoparticles in solution
International audienc
Microwave-assisted Synthesis of Novel Thiazolocarbazoles and Evaluation as Potential Anticancer Agents. Part III
Metrological Protocols for Reaching Reliable and SI-Traceable Size Results for Multi-Modal and Complexly Shaped Reference Nanoparticles
International audienceThe study described in this paper was conducted in the framework of the European nPSize project (EMPIR program) with the main objective of proposing new reference certified nanomaterials for the market in order to improve the reliability and traceability of nanoparticle size measurements. For this purpose, bimodal populations as well as complexly shaped nanoparticles (bipyramids, cubes, and rods) were synthesized. An inter-laboratory comparison was organized for comparing the size measurements of the selected nanoparticle samples performed with electron microscopy (TEM, SEM, and TSEM), scanning probe microscopy (AFM), or small-angle X-ray scattering (SAXS). The results demonstrate good consistency of the measured size by the different techniques in cases where special care was taken for sample preparation, instrument calibration, and the clear definition of the measurand. For each characterization method, the calibration process is described and a semi-quantitative table grouping the main error sources is proposed for estimating the uncertainties associated with the measurements. Regarding microscopy-based techniques applied to complexly shaped nanoparticles, data dispersion can be observed when the size measurements are affected by the orientation of the nanoparticles on the substrate. For the most complex materials, hybrid approaches combining several complementary techniques were tested, with the outcome being that the reliability of the size results was improved
La cĂ©ramique mĂ©diĂ©vale et moderne du bassin de la Loire moyenne, chrono-typologie et transformation des aires culturelles dans la longue durĂ©e (6eâ19e s.)
International audienceLa prĂ©sente publication, en accĂšs libre sur Huma-Num, rĂ©sulte dâun Projet Collectif de Recherche (PCR) sur la cĂ©ramique mĂ©diĂ©vale et moderne du bassin de la Loire moyenne qui sâinscrit dans la longue durĂ©e, puisquâil a commencĂ© en 1996 et a dĂ©jĂ fait lâobjet de deux supplĂ©ments Ă la RACF (Husi 2003 dir. https://www.persee.fr/issue/sracf_1159-7151_2003_ant1 et Husi 2013 dir. https://journals.openedition.org/racf/1860).Cette publication a comme objectif dâapprĂ©hender : (i) la question de la chronologie Ă partir dâune dĂ©marche archĂ©o-statistique originale ; (ii) les questions Ă©conomiques sociales et culturelles notamment liĂ©es aux traditions de fabrication, aux flux et aux Ă©changes de rĂ©cipients au sein et Ă lâextĂ©rieur de lâespace retenu et dans la longue durĂ©e (6e-19e s.) ; (iii) la question de la pertinence de la cĂ©ramique comme source essentielle de la culture matĂ©rielle, comme indicateur fonctionnel des sites et social des habitants.Nous avons fait ici le choix dâun format de publication logiciste dont lâoriginalitĂ© est de proposer une lecture rapide et Ă plusieurs niveaux du raisonnement, des rĂ©sultats et de lâargumentaire Ă partir dâune masse importante de donnĂ©es. En effet, lâanalyse logiciste est fondĂ©e sur des opĂ©rations logiques, dites dâinfĂ©rence, Ă double lecture, dans un sens sur un raisonnement empirico-inductif dâinfĂ©rence par gĂ©nĂ©ralisation des observations et dans lâautre sur un raisonnement hypothĂ©tico-dĂ©ductif dâinfĂ©rence dĂ©duite des prĂ©misses, excluant de fait des textes longs et descriptifs.Lâarchitecture de la publication sâarticule autour de sept grands blocs qui se dĂ©clinent de la maniĂšre suivante : (Bloc 1) La chronologie, prĂ©alable indispensable Ă tout discours historique, construite Ă partir d'une dĂ©marche archĂ©o-statistique originale aboutissant Ă une pĂ©riodisation gĂ©nĂ©rale des sites et des ensembles Ă lâorigine de la chrono-typologie de la cĂ©ramiqueâŻ; (Bloc 2) les diagrammes logicistes subdivisĂ©s en deux sections, reprĂ©sentent graphiquement la structure arborescente des chaĂźnes dâinfĂ©rence entre les propositions logicistesâŻ; (Bloc 3) une suite de propositions logicistes fondĂ©es sur lâanalyse commentĂ©e des donnĂ©es primaires, introduites pour chacune des deux sections par un court texte de synthĂšse des rĂ©sultats historiquesâŻ; (Bloc 4) les mĂ©thodes archĂ©o-statistiques Ă©laborĂ©es pour analyser un corpus de donnĂ©es volumineuxâŻ; (Bloc 5) les planches chrono-typologiques de synthĂšse rĂ©alisĂ©es par sous-espaces constitutifs du bassin de la Loire moyenne et les rĂ©pertoires typologiquesâŻ; (Bloc 6) les donnĂ©es mobilisĂ©es dans le cadre de cette publicationâŻ; (Bloc 7) deux Ă©tudes thĂ©matiques abordant (i) la question des pĂ©riodes de transition (ii) un type de rĂ©cipient particulier, les cloches de cuisson en terre cuite chamottĂ©e.Enfin sont prĂ©sentĂ©es les notices de sites et dâassemblages cĂ©ramiques comprenant une rapide explication du contexte archĂ©ologique, les planches de dessins et lâaccĂšs aux donnĂ©es pour chaque assemblage. Bien que volumineux, donc quelque peu en contradiction avec le choix dâune publication logiciste, ce chapitre doit ĂȘtre perçu comme un ensemble dâinformations supplĂ©mentaires Ă la lecture de la publication logiciste.Les mĂ©thodes archĂ©o-statistiques Ă©laborĂ©es pour lâanalyse de donnĂ©es mobiliĂšre volumineuses sont dĂ©veloppĂ©es dans le cadre du projet interdisciplinaire SPARTAAS, collaboration entre le laboratoire ArchĂ©ologie et Territoires (UMR CITERES-LAT, CNRS/UniversitĂ© de Tours) et le laboratoire de mathĂ©matiques de lâUniversitĂ© de Nantes (UMR LMJL, CNRS/UniversitĂ© de Nantes). Outre lâusage frĂ©quent de liens hypertextes mettant en relation des diffĂ©rents blocs, la publication se rĂ©fĂšre Ă©galement Ă la base de donnĂ©es en ligne du rĂ©seau dâinformation sur la cĂ©ramique mĂ©diĂ©vale et moderne ICERAMM