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排序方式: 共有937条查询结果,搜索用时 218 毫秒
931.
932.
Geoffrey R. Davies W. James Feast Vernon C. Gibson Hugh V. ST. A. Hubbard Kenneth J. Ivin Alan M. Kenwright Ezat Khosravi Edward L. Marshall Jonathan P. Mitchell Ian M. Ward Brian Wilson 《Macromolecular Symposia》1993,66(1):289-296
Since the first report of the ring-opening metathesis polymerization of fluorinated monomers in 1979 considerable advances in precision and control of such syntheses have been achieved through the introduction of well defined initiators. It is now possible to carry out well controlled living and stereoregular polymerizations. The products of such syntheses can display unusually high relaxed dielectric constants, an observation which is crucial to the assignment of their tacticities and probably significant with regard to possible applications of this type of material. 相似文献
933.
Paul A. Cameron Dhanjay Jhurry Vernon C. Gibson Andrew J. P. White David J. Williams Susannah Williams 《Macromolecular rapid communications》1999,20(12):616-618
The Schiff-base aluminium complex [5-Cl-salen]AlOMe ( 2 ) is shown to be a room temperature initiator for controlled ring-opening polymerization of D ,L - and L -lactides; the molecular structure of the precursor [5-Cl-salen]AlMe ( 1 ) reveals a distorted trigonal bipyramidal geometry. 相似文献
934.
935.
Reaction of methyl benzoylphosphonochloridate (3) with a secondary or primary series of amines yielded methyl benzoylphosphonamidates, 4a-e. The latter compounds reacted with hydroxylamine to yield a-hydroxyiminobenzylphosphonamidates (5a-e), largely as (E)-isomers. The structure of methyl (E)-a-hydroxyimino-benzyl-1-pyrrolidinylphosphinate (5b) was determined by single-crystal X-ray crystallography. Heating oximes 5a-e in boiling toluene caused them to undergo Beckmann rearrangement to N-benzoylphosphordiamidates 6a-e. © 1996 John Wiley & Sons, Inc. 相似文献
936.
Dylan Mah Dr. Yanan Zhu Dr. Guowei Su Prof. Jing Zhao Dr. Ashely Canning Dr. James Gibson Dr. Xuehong Song Dr. Eduardo Stancanelli Dr. Yongmei Xu Prof. Fuming Zhang Prof. Robert J. Linhardt Prof. Jian Liu Lianchun Wang Prof. Chunyu Wang 《Angewandte Chemie (International ed. in English)》2023,62(23):e202212636
Apolipoprotein E (ApoE)’s ϵ4 alle is the most important genetic risk factor for late onset Alzheimer's Disease (AD). Cell-surface heparan sulfate (HS) is a cofactor for ApoE/LRP1 interaction and the prion-like spread of tau pathology between cells. 3-O-sulfo (3-O-S) modification of HS has been linked to AD through its interaction with tau, and enhanced levels of 3-O-sulfated HS and 3-O-sulfotransferases in the AD brain. In this study, we characterized ApoE/HS interactions in wildtype ApoE3, AD-linked ApoE4, and AD-protective ApoE2 and ApoE3-Christchurch. Glycan microarray and SPR assays revealed that all ApoE isoforms recognized 3-O-S. NMR titration localized ApoE/3-O-S binding to the vicinity of the canonical HS binding motif. In cells, the knockout of HS3ST1-a major 3-O sulfotransferase-reduced cell surface binding and uptake of ApoE. 3-O-S is thus recognized by both tau and ApoE, suggesting that the interplay between 3-O-sulfated HS, tau and ApoE isoforms may modulate AD risk. 相似文献
937.
The fragmentation chemistry of UO2(N3)Cl2‐ (obtained by electrospray ionization of MeOH solutions containing UO2Cl2 and NaN3) in the gas phase is investigated using quadrupole ion trap mass spectrometry. 相似文献