Search results for "Metals"
showing 10 items of 2013 documents
Steric vs. electronic stereocontrol in syndio- or iso-selective ROP of functional chiral β-lactones mediated by achiral yttrium-bisphenolate complexes
2018
International audience; Origins of stereoselectivity in ROP of racemic chiral cyclic esters promoted by achiral yttrium complexes, resulting in the formation of highly heterotactic polylactide, and highly syndiotactic or, more uniquely, highly isotactic poly(3-hydroxybutyrate)s, are discussed. A close interplay between the nature of the cyclic ester, most particularly of the exocyclic functional chain installed on the chiral center of β-lactones, and the ortho-substituents installed on the phenolate rings of the ligand, results in various determining secondary interactions of steric and also electronic nature.
Ligand effects on the dimensionality of oxamato-bridged mixed-metal open-framework magnets
2012
Increasing dimensionality [from 2D (1) to 3D (2)] and T(C) [from 10 (1) to 20 K (2)] in two new oxamato-bridged heterobimetallic Mn(II)(2)Cu(II)(3) open-frameworks result from the steric hindrance provided by the different alkyl substituents of the N-phenyloxamate bridging ligands.
The Symbolism of Fear-Themed Drawings of Turkish and Polish Children
2023
The article presents results of a study on fear-themed drawings, which was conducted in groups of Turkish and Polish children. The aim of the study was to learn about fears presented by 6-10-year-old children. The study consisted in comparing symbols recognized in drawings made by children of the two nationalities and their interpretation, taking into account the cultural context. For the needs of the comparative analysis the authors formulated the following questions: What kind of symbolism appears in the pictures created by the examined children? What are similarities and differences in the symbolism presented in the drawings? How can one interpret the recognized symbols? The largest numb…
Invisibilia 2. Da folengo a rizzoni: linguaggio creativo e traduzione di Auguste le Breton
2022
. Acest studiu este dedicat operei lui Gianni Rizzoni, unul dintre principalii traducători de romane polițiste franceze în Italia, în special al seriei Sanantonio creată de Frédéric Dard. Acest articol își propune să studieze traducerea cărților lui Auguste Le Breton și glosarul de argou italian creat de către Rizzoni care i-a permis traducătorului să mai transpună cu mai multă acuratețe argoul autorului francez. This study is dedicated to the work of Gianni Rizzoni who is one of the major translators of French detective stories in Italy and in particular of Sanantonio series created by Frédéric Dard. This article will deal with the translation of Auguste Le Breton’s books and the creation …
ChIP-Seq from Limited Starting Material of K562 Cells and Drosophila Neuroblasts Using Tagmentation Assisted Fragmentation Approach
2019
Chromatin immunoprecipitation is extensively used to investigate the epigenetic profile and transcription factor binding sites in the genome. However, when the starting material is limited, the conventional ChIP-Seq approach cannot be implemented. This protocol describes a method that can be used to generate the chromatin profiles from as low as 100 human or 1,000 Drosophila cells. The method employs tagmentation to fragment the chromatin with concomitant addition of sequencing adaptors. The method generates datasets with high signal to noise ratio and can be subjected to standard tools for ChIP-Seq analysis.
Between the Holy Cross and Free Market. Addressing the Issue of Homosexuality in the Narratives of Former Students in Polish Schools
2021
In the article the authors present the results of the research based on in-depth interviews with 22 young gays and lesbians, graduates of different types schools in Poland. The main goal of the research was to indicate how, in the opinions of the respondents, the issue of homosexuality was addressed in schools they attended and how these particular ways of treating homosexuality might be related to the wider socio-cultural context. The qualitative analysis of the narratives with the application of thematic analysis of the data let the authors identify four main categories comprising the ways of dealing with the issue of homosexuality (silence, pathologising attitude, the language of sin, po…
Enantioselective synthesis of pyrazolone α-aminonitrile derivatives via an organocatalytic Strecker reaction
2017
A new organocatalytic enantioselective Strecker reaction of pyrazolone-derived ketimine electrophiles has been developed. Using pseudo-enantiomeric squaramide catalysts the nucleophilic 1,2-addition of trimethylsilyl cyanide to the ketimines efficiently provides a direct entry to both enantiomers of pyrazolone α- aminonitrile derivatives at will in good yields and high enantioselectivities for a wide variety of substrates. peerReviewed
Real time optical immunosensing with flow-through porous alumina membranes
2014
Through the presentation of analytical data from bioassay experiments, measured by polarimetry, we demonstrate for the first time a real time immunoassay within a free standing macroporous alumina membrane. The 200 nm nominal pore diameter of the membrane enables flow-through, thereby providing an ideal fluidic platform for the targeted delivery of analytes to bioreceptors immobilized on the pore walls, enabling fast sensing response times and the use of small sample volumes (<100 mu L). For the immunoassay, the pore walls were first coated with the functional copolymer, copoly(DMA-NAS) using a novel coupling process, before immobilization of the allergen protein, beta-lactoglobulin, by spo…
Specific recognition and formation of two- dimensional streptavidin domains in monolayers: applications to molecular devices
1989
Abstract By virtue of the high-affinity specific interaction between the vitamin, biotin, and the protein, streptavidin, monolayers of synthetic lipids with biotin headgroups can tightly bind streptavidin at the lipid-water interface. Through this specific recognition fluorescently-labelled streptavidin spontaneously organizes in the plane of the interface to form large protein domains, directly visible in situ by fluorescence microscopy and exhibiting optical anisotropy. Further structural characterization has shown that these domains are two-dimensional protein crystals. Correlation with the known three-dimensional crystal structure of streptavidin indicates that two of streptavidin's fou…
Molecular recognition processes at functionalized lipid surfaces: a neutron reflectivity study
1992
The specific binding of proteins to functionalized monolayers on aqueous subphases has been characterized by neutron reflectivity measurements. As a model for the investigation of a recognition process on a molecular length scale, streptavidin (SA) and biotin were chosen because of the high specific affinity between them. Reflectivities from the aqueous (NaCl/H2O or NaCl/D2O) surfaces covered with the biotin-lipid monolayers before and after the adsorption of proteins were collected with a novel, fixed wavelength liquid surface neutron reflectometer. In quantitative terms, binding was found to occur at a biotin surface concentration as low as 1 molecule/1250 A2 (compare to ∼ 1 molecule/40 A…