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排序方式: 共有111条查询结果,搜索用时 15 毫秒
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Dr. Daniele Maiolo Dr. Andrea Pizzi Dr. Alessandro Gori Dr. Lara Gazzera Dr. Nicola Demitri Dr. Alessandro Genoni Dr. Fulvio Baggi Dr. Fabio Moda Prof. Dr. Giancarlo Terraneo Prof. Dr. Francesca Baldelli Bombelli Prof. Dr. Pierangelo Metrangolo Prof. Dr. Giuseppe Resnati 《ChemistryOpen》2020,9(2):253-260
Here, we demonstrate that introduction of halogen atoms at the tyrosine 10 phenol ring of the DSGYEV sequence derived from the flexible amyloid-β N-terminus, promotes its self-assembly in the solid state. In particular, we report the crystal structures of two halogen-modified sequences, which we found to be stabilized in the solid state by halogen-mediated interactions. The structural study is corroborated by Non-Covalent Interaction (NCI) analysis. Our results prove that selective halogenation of an amino acid enhances the supramolecular organization of otherwise unstructured biologically-relevant sequences. This method may develop as a general strategy for stabilizing highly polymorphic peptide regions. 相似文献
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Pierangelo Marcati Manuela Molinari 《NoDEA : Nonlinear Differential Equations and Applications》2009,6(2):119-132
In this paper we first prove short time existence of a classical solution for the problem which describes the evolution by
Gaussian curvature of a strictly convex hypersurface in . Then we give a proof of the existence of a viscosity solution for this problem in such a way as to define a generalized
motion existing for each time.
Received November 24, 1997 相似文献
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Liantonio R Metrangolo P Meyer F Pilati T Navarrini W Resnati G 《Chemical communications (Cambridge, England)》2006,(17):1819-1821
Two homologues of supramolecular Borromean rings were obtained based on the halogen-bonding-driven self-assembly of iodide ions with telechelic diiodoperfluoroalkanes. 相似文献
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Abbate S Barlati S Colombi M Fornili SL Francescato P Gangemi F Lebon F Longhi G Manitto P Recca T Speranza G Zoppi N 《Physical chemistry chemical physics : PCCP》2006,8(40):4668-4677
Circular dichroism (CD), and NMR spectra have been recorded and molecular dynamics (MD) simulations have been performed in water and water-trifluoroethanol (TFE) mixed solvent for a synthetic biologically active 13-amino-acid fragment of human fibronectin and two related peptides. The CD results are interpreted on the basis of statistical analyses of MD trajectories and of ensuing calculations of CD spectra based on Schellman's matrix method. It is observed that the peptide conformation is quite variable in water and loses its mobility with the addition of TFE. (1)H-NOE data were found to be consistent with the most abundant calculated conformation. 相似文献
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Ruffieux P Gröning O Fasel R Kastler M Wasserfallen D Müllen K Gröning P 《The journal of physical chemistry. B》2006,110(23):11253-11258
We present a low-temperature scanning tunneling microscopy study on the self-assembly of extended polycyclic aromatic hydrocarbons with different symmetries on the Cu111 surface. All molecules show a commensurate monolayer structure, with significant structural differences with respect to the unit cell of the molecular lattice and the orientational ordering. We find that the molecular lattice and the molecular orientation are largely dominated by molecule-substrate interactions, whereas molecule-molecule interactions determine the molecular packing density via steric repulsion. Moreover, we show that the structure of the monolayer is transferred to the second layer via molecule-molecule interaction. 相似文献
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De Santis A Forni A Liantonio R Metrangolo P Pilati T Resnati G 《Chemistry (Weinheim an der Bergstrasse, Germany)》2003,9(16):3974-3983
The N.Br halogen bonding drives the self-assembly of 1,4-dibromotetrafluorobenzene (1 a) and its 1,3 or 1,2 analogues (1 b,c, respectively) with dipyridyl derivatives 2 a,b. The isomeric supramolecular architectures 3 a-f are obtained as cocrystals that are stable in the air at room temperature. The solid-state features of these 1D infinite chains 3 have been fully characterized by single-crystal X-ray, Raman, and IR analyses. The occurrence of N.Br halogen bonding in solution has been detected with (19)F NMR spectroscopy. The N.Br halogen bonding is highly selective and directional and the geometry of the single strands of noncovalent copolymers 3 is programmed by the geometry of halogen-bonding donor and acceptor sites on the starting modules. The composition and topology of the instructed networks can be predicted with great accuracy. Experiments of competitive cocrystal formation established the strength of the N.Br interaction relative to other halogen bondings and the ability of different modules 1 to be involved in site-selective supramolecular syntheses. 相似文献