排序方式: 共有80条查询结果,搜索用时 15 毫秒
41.
Wafaa Zaaraoui Audrey Rico Bertrand Audoin Françoise Reuter Irina Malikova Elisabeth Soulier Patrick Viout Yann Le Fur Sylviane Confort-Gouny Patrick J. Cozzone Jean Pelletier Jean-Philippe Ranjeva 《Magnetic resonance imaging》2010
Background
Acute symptomatic inflammation is a main feature of multiple sclerosis but pathophysiological processes underlying total or partial recovery are poorly understood.Objective
To characterize in vivo these processes at molecular, structural and functional levels using multimodal MR methods.Methods
A neuroimaging 3-year follow-up (Weeks 0, 3, 11, 29, 59 and 169) was conducted on a 41-year-old woman presenting at baseline with a large acute demyelinating lesion of multiple sclerosis. Conventional magnetic resonance imaging (MRI), magnetization transfer imaging, diffusion-weighted imaging, functional MRI and magnetic resonance spectroscopy were conducted at 1.5 T.Results
Patient presenting with subacute left hemiplegia recovered progressively (expended disability status scale 7 to 5.5). The MR exploration demonstrated structural functional and metabolic impairments at baseline. Despite restoration of the blood brain barrier integrity, high lactate levels persisted for several weeks concomitant with glial activation. Slow and progressive structural and metabolic restorations occurred from baseline to W169 (lesion volume −64%; apparent diffusion coefficient −14.7%, magnetization transfer ratio +14%, choline −51%, lipids −78%, N-acetylaspartate +77%) while functionality of the motor system recovered.Conclusions
Multimodal MRI/MRS evidenced long-term dynamics recovery processes involving tissue repair, glial activation, recovery of neuronal function and functional systems. This may impact on customized rehabilitation strategies generally focused on the first months following the onset of symptoms. 相似文献42.
Karen Aknin Stéphanie Desbène-Finck Philippe Helissey Sylviane Giorgi-Renault 《Molecular diversity》2010,14(1):123-130
Functionalized pyrimido[4,5-b]quinoline-2,4 (1H,3H)-diones were synthesized by a three-component one-pot reaction involving barbituric acid, aldehydes, and anilines. The use
of commercially available anilines allowed the facile syntheses of pyrimido[4,5-b]quinolinediones substituted in all the positions on the benzene ring with electron donor or electron withdrawing groups.
This straightforward method circumvents the preparation of unstable substituted 2-aminobenzaldehydes that limits the scope
of previously described syntheses. Furthermore, access to the 5-substituted derivatives is now also possible starting from
aliphatic or aromatic aldehydes. Our strategy and methodology offer significant and practical improvements over other methodologies. 相似文献
43.
Raphaël Labruère Philippe Helissey Stéphanie Desbène‐Finck Sylviane Giorgi‐Renault 《Helvetica chimica acta》2013,96(5):919-923
In the context of our aim of discovering new antitumor drugs among synthetic γ‐lactone‐ and γ‐lactam‐fused 1‐methylquinolin‐4(1H)‐ones, we developed a rapid access to 5‐methyl‐1,3‐dioxolo[4,5‐g]furo[3,4‐b]quinoline‐8,9(5H,6H)‐dione ( 9 ) exploiting the γ‐lactone‐fused chloroquinoline 10 previously synthesized in our laboratory (Scheme 1). We also elaborated efficient synthetic methods allowing for a rapid access to two nonclassical bioisosteres of 9 , i.e., a deoxy and a carba analogue. The deoxy analogue 11 was prepared in two steps from the γ‐lactone‐fused quinoline 13 which was also the synthetic precursor of 10 (Scheme 1). The carba analogue 6,9‐dihydro‐5‐methyl‐9‐methylene‐1,3‐dioxolo[4,5‐g]furo[3,4‐b]quinolin‐8(5H)‐one ( 12 ) was easily prepared by HCl elimination from the 9‐(chloromethyl)dioxolofuroquinoline 15 , which was obtained via a three‐component one‐pot reaction from N‐methyl‐3,4‐(methylenedioxy)aniline (=N‐methyl‐1,3‐benzodioxol‐5‐amine; 16 ), commercially available chloroacetaldehyde, and tetronic acid ( 17 ) (Scheme 2). 相似文献
44.
Shazia Tanvir Jacques Pantigny Sandrine Morandat Sylviane Pulvin 《Colloids and surfaces. B, Biointerfaces》2009,68(2):178-183
In the present report, physically adsorbed rat liver microsomes were used in order to optimize the immobilization of membrane proteins on solid surfaces for use in biosensing and microreactor applications. Physical adsorption was used to form thin films on solid supports (gold, mica, macroporous aluminum oxide membrane). The characterization of the films was performed by surface plasmon resonance (SPR), atomic force microscopy (AFM) and environmental scanning electron microscopy (ESEM). Commercially available macroporous aluminium oxide membranes with a high surface area, allow the retention of a high amount of microsomal membranes in the form of a thin film. Microsomal film functionality was tested by monitoring the activities of several enzymes of phases I and II. Microsomal modified supports can be re-utilized for the same or different substrate after washing with appropriate buffer. 相似文献
45.
C. Gunnar Werncke Philip C. Bunting Carine Duhayon Jeffrey R. Long Sbastien Bontemps Sylviane Sabo‐Etienne 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(1):247-250
First‐row two‐coordinate complexes are attracting much interest. Herein, we report the high‐yield isolation of the linear two‐coordinate iron(I) complex salt [K(L)][Fe{N(SiMe3)2}2] (L=18‐crown‐6 or crypt‐222) through the reduction of either [Fe{N(SiMe3)2}2] or its three‐coordinate phosphine adduct [Fe{N(SiMe3)2}2(PCy3)]. Detailed characterization is gained through X‐ray diffraction, variable‐temperature NMR spectroscopy, and magnetic susceptibility studies. One‐ and two‐electron oxidation through reaction with I2 is further found to afford the corresponding iodo iron(II) and diiodo iron(III) complexes. 相似文献
46.
Vergnaud J Ayed T Hussein K Vendier L Grellier M Bouhadir G Barthelat JC Sabo-Etienne S Bourissou D 《Dalton transactions (Cambridge, England : 2003)》2007,(23):2370-2372
The new pyridine-borane compound (2-picolyl)BCy2, readily prepared from 2-picolyllithium and ClBCy2, adopts a head-to-tail dimeric structure in the solid state as indicated by X-ray diffraction analysis and according to NMR and DFT studies, the dimeric form equilibrates in solution with a strained monomeric structure; the ambiphilic behavior of the new compound is illustrated by its bridging coordination to the (p-cymene)RuCl2 unit. 相似文献
47.
48.
Quoc Anh NgoFanny Roussi Sylviane ThoretFrançoise Guéritte 《Tetrahedron letters》2012,53(44):5821-5823
Four new vinca alkaloids have been elaborated, using an unexpected isomerization and formation of stable enammoniums in very mild conditions. They are cytotoxic on a sub-micromolar range and inhibit microtubule assembly. 相似文献
49.
Virginie Colombel Sylviane Thoret Jérôme Bignon Olivier Baudoin 《Tetrahedron letters》2010,51(23):3127-1705
New dibenzoxepines 5a-i bearing various substituents on B- and C-rings were synthesized in a straightforward manner using a Suzuki-Miyaura coupling, a Grignard addition, and a cyclodehydration as key steps. The antimicrotubule activity of all analogues was evaluated and compared to reference compounds. Compounds 5d-f displayed the highest activity for this type of allocolchicinoids to date. 相似文献
50.