l'auteur explique le comportement des esters cycliques neutres vis -a- vis de l'eau ,de l'acide chlorhydrique , ainsi que la polymerisation des ethylphosphates cycliques d'ethylene et de propylene par des traces d'eau. les produits resultant de la plymerisation de ce dernicr phosphate cyclique sont plus complexes que ceux obtenus dans les memes conditions avec 1'et...

A series of bis(thiazolinyl)- and bis(thiazolyl)pyridine Thio-Pybox ligands and their metal complexes of chromium(III), iron(II), cobalt(II) and nickel(II) has been prepared, as well as a nickel(II) complex containing a monoanionic bis(thiazolinyl)phenyl Thio-Phebox ligand. These new metal complexes have been characterised and used as catalysts, in combination with the co-catalyst MAO, for the ...

la mouillabilite est un phenomene pui depend d'un grand nombre de facteurs. chacun de ces facteurs , qu'il soit d'order physipue ou chimipue, joue un grand role. on peut distinguer : 1 - la granulometrie du solide. elle est en relation avec la surface sped fipue des solides . plus cette surface est en grande, plus le mouillage est fort. 2 - la temperature : l'elevation de la...

Vanadium complexes containing bis(benzimidazole)amine ligands, upon activation by simple alkylaluminium reagents, give unusually robust, single-site, catalysts for olefin polymerisation/co-polymerisation.

Highly cis-1,4 polymerisation of isoprene and syndiospecific polymerisation of styrene were conducted using the same borohydrido half-sandwich scandium pre-initiator.

Water-soluble stimuli-responsive AB2 miktoarm star copolymers were prepared by atom transfer radical polymerisation of styrene followed by chain-end modification, polymerisation of either gamma-benzyl-L-glutamate N-carboxyanhydride or tert-butylacrylate and a final step of hydrolysis.

OBJECTIVE The purpose of this study was to evaluate the effect of two post-polymerisation treatments and different cycles of polymerisation on the cytotoxicity of two denture base resins. MATERIALS AND METHODS The resins tested were Lucitone 550 and QC 20. Discs of resins were fabricated following the manufacturer's instructions. Lucitone 550 was processed by long cycle or short cycle. The re...

INTRODUCTION Nucleoside diphosphate kinase (NDK), conserved across bacteria to humans, synthesises NTP from NDP and ATP. The eukaryotic homologue, the NDPK, uses ATP to phosphorylate the tubulin-bound GDP to GTP for tubulin polymerisation. The bacterial cytokinetic protein FtsZ, which is the tubulin homologue, also uses GTP for polymerisation. Therefore, we examined whether NDK can interact wit...