73 research outputs found
Correction: Haddad et al. Evaluation of the Antibacterial Activity of New Dermaseptin Derivatives against Acinetobacter baumannii. Pharmaceuticals 2024, 17, 171
No full textRemoval of an Author [...
On the performance of Fe-Cu-ZSM-5 catalyst for the selective catalytic reduction of NO with NH3: the influence of preparation method
No full text[EN] The selective catalytic reduction of NO with ammonia (NH3-SCR) in the presence of H2O was studied over a series of Fe-Cu-ZSM-5 catalysts prepared by solid-state ion exchange (SSIE), aqueous ion exchange and impregnation methods. The prepared samples were characterized by various techniques (ICP-AES, N-2 physisorption at 77K, XRD, STEM-EDX, XPS, H-2-TPR and DRS UV-vis) to investigate the effect of the preparation method on the activity, texture, structure and metal speciation of the studied catalysts. It was found that the aqueous ion exchange method induced a significant metal loss during the preparation procedure but without any activity deterioration of the catalyst which encloses highly dispersed metal species. The catalysts prepared by SSIE and impregnation showed the highest metal contents and a large number of oxide aggregates leading to an activity decline at high reaction temperatures due to the ammonia oxidation phenomenon.Financial support by the MINECO of Spain through the Severo Ochoa (SEV-2016-0683) and CTQ2015-68951C3-1-R projects is gratefully acknowledged. The authors thank the Electron Microscopy Service of the Universitat Politecnica de Valencia for STEM experiments. J. Martinez-Ortigosa (SEV-2012-0267-02) is grateful to Severo Ochoa Program for a predoctoral fellowship.Jouini, H.; Martinez-Ortigosa, J.; Mejri, I.; Mhamdi, M.; Blasco Lanzuela, T.; Delahay, G. (2019). On the performance of Fe-Cu-ZSM-5 catalyst for the selective catalytic reduction of NO with NH3: the influence of preparation method. Research on Chemical Intermediates. 45(3):1057-1072. https://doi.org/10.1007/s11164-018-3658-8S1057107245
Evaluation of the Antibacterial Activity of New Dermaseptin Derivatives against <em>Acinetobacter baumannii</em>
No full textNosocomial infections represent one of the biggest health problems nowadays. Acinetobacter baumannii is known as an opportunistic pathogen in humans, affecting people with compromised immune systems, and is becoming increasingly important as a hospital-derived infection. It is known that in recent years, more and more bacteria have become multidrug-resistant (MDR) and, for this reason, the development of new drugs is a priority. However, these products must not affect the human body, and therefore, cytotoxicity studies are mandatory. In this context, antimicrobial peptides with potential antibacterial proprieties could be an alternative. In this research, we describe the synthesis and the bioactivity of dermaseptins and their derivatives against Acinetobacter baumannii. The cytotoxicity of these compounds was investigated on the HEp-2 cell line by MTT cell viability assay. Thereafter, we studied the morphological alterations caused by the action of one of the active peptides on the bacterial membrane using atomic force microscopy (AFM). The cytotoxicity of dermaseptins was concentration-dependent at microgram concentrations. It was observed that all tested analogs exhibited antibacterial activity with Minimum Inhibitory Concentrations (MICs) ranging from 3.125 to 12.5 μg/mL and Minimum Bactericidal Concentrations (MBCs) ranging from 6.25 to 25 μg/mL. Microscopic images obtained by AFM revealed morphological changes on the surface of the treated bacteria caused by K4S4(1-16), as well as significant surface alterations. Overall, these findings demonstrate that dermaseptins might constitute new lead structures for the development of potent antibacterial agents against Acinetobacter baumannii infections
Alkali poisoning of Fe-Cu-ZSM-5 catalyst for the selective catalytic reduction of NO with NH3
No full text[EN] Fe (2 wt%)-Cu (1.5 wt%)-ZSM-5 SCR catalyst contacted 1.5 wt% of Na and 1.8 wt% of K in order to simulate poisoning by species more specifically contained in exhaust gases from exhaust gases of diesel engines and power plants. Poisoning agents do not cause loss of surface area nor pore occlusion. XRD and SEM results showed that alkali metals introduction did not deteriorate the crystallinity and morphology of zeolite crystals. However, a significant loss of surface acidity was observed upon alkali-poisoned catalysts causing a dramatic deactivation of the NH3-SCR of NO reaction. Na-doped catalyst showed higher low-temperature SCR activity, while potassium has a stronger deactivation effect on Fe-Cu-ZSM-5 than sodium beyond 400 degrees C.Jouini, H.; Mejri, I.; Martinez-Ortigosa, J.; Cerrillo, JL.; Petitto, C.; Mhamdi, M.; Blasco Lanzuela, T.... (2022). Alkali poisoning of Fe-Cu-ZSM-5 catalyst for the selective catalytic reduction of NO with NH3. Research on Chemical Intermediates. 48(8):3415-3428. https://doi.org/10.1007/s11164-022-04768-9S3415342848
Predicates, Sense, Polylexicality, and Freezing: a heuristic path
No full textPour Gaston Gross, étudier rigoureusement la langue revient à en décrire, dans le cadre de la combinatoire libre, l’ensemble des emplois des unités lexicales moyennant l’établissement des paradigmes argumentaux impliqués dans les schémas d’arguments pour les prédicats et l’ensemble des prédicats appropriés pour les arguments. Cette démarche est complétée par la description des séquences figées dont la combinatoire interne est plus ou moins restreinte. L’auteur y consacre son ouvrage de 1996 et une partie de son manuel de 2012. Nous retenons dans cette contribution l’extrême richesse de la réflexion de l’auteur, notamment sur le plan heuristique, en partant des concepts de prédicat, de figement, de polylexicalité et d’opacité sémantique pour montrer combien les suggestions méthodologiques de Gaston Gross ont eu d’impact sur le développement de la discipline linguistique.For Gaston Gross, a rigorous study of the language means describing all the uses of lexical units of the language within the framework of free combinatorics, by determining the argumental paradigms involved in the schemes of arguments for predicates and all the appropriate predicates for arguments. This approach is complemented by a description of frozen sequences whose internal combinatoriality is more or less restricted. The author devotes his work of 1996 and part of his textbook of 2012 to this subject. Our contribution highlights the great richness of the author’s thoughts particularly from a heuristic point of view. We start from the concepts of predicate, frozeness, polylexicality and semantic opacity to show how much impact Gaston Gross’s methodological suggestions have had on the development of the discipline of linguistics
Prédicats, sens, polylexicalité et figement : un parcours heuristique
No full textFor Gaston Gross, a rigorous study of the language means describing all the uses of lexical units of the language within the framework of free combinatorics, by determining the argumental paradigms involved in the schemes of arguments for predicates and all the appropriate predicates for arguments. This approach is complemented by a description of frozen sequences whose internal combinatoriality is more or less restricted. The author devotes his work of 1996 and part of his textbook of 2012 to this subject. Our contribution highlights the great richness of the author’s thoughts particularly from a heuristic point of view. We start from the concepts of predicate, frozeness, polylexicality and semantic opacity to show how much impact Gaston Gross’s methodological suggestions have had on the development of the discipline of linguistics.Pour Gaston Gross, étudier rigoureusement la langue revient à en décrire, dans le cadre de la combinatoire libre, l’ensemble des emplois des unités lexicales moyennant l’établissement des paradigmes argumentaux impliqués dans les schémas d’arguments pour les prédicats et l’ensemble des prédicats appropriés pour les arguments. Cette démarche est complétée par la description des séquences figées dont la combinatoire interne est plus ou moins restreinte. L’auteur y consacre son ouvrage de 1996 et une partie de son manuel de 2012. Nous retenons dans cette contribution l’extrême richesse de la réflexion de l’auteur, notamment sur le plan heuristique, en partant des concepts de prédicat, de figement, de polylexicalité et d’opacité sémantique pour montrer combien les suggestions méthodologiques de Gaston Gross ont eu d’impact sur le développement de la discipline linguistique
Synthesis of C,N,N-Cyclometalated Gold(III) Complexes with Anionic Amide Ligands
No full textA series of neutral C,N,N Au(III) complexes were synthesized with N -(8-quinolinyl)benzamide derivatives or chiral N -[2-(1,3-oxazolin-2-yl)phenyl]benzamide derivatives. The convenient synthesis method for the amide ligands, together with their operationally simple complexation by direct C-H auration, permitted changes to both the steric and electronic properties of Au(III) complexes for promoting the catalytic three-component couplings of an aldehyde, an amine, and an alkyne
FRASEOLOGISMOS EM MANCHETES DE UM JORNAL PARAENSE
No full textThe purpose of this article is to present and analyze phraseological units published in the headlines of a widely circulated newspaper in the State of Pará. For this purpose, the work is based on the French current of phraseological studies according to Mejri (1997; 2012), especially with regard to the adoption of the criteria pointed out by this author, namely: polylexicality, fixity, congruence, frequency, predictability and idiomaticity, which make itpossible to identify and carry out the typology of the examples found. The exploratory and descriptive research (GIL,2017) presents a sample collected from journalistic headlines extracted from the electronic version of the Jornal O Liberal published in September 2019. The results show 24 phraseologies, such as:(opens the game) abre o jogo, ceiling glass (teto de vidro), crying isf ree (o choro é livre), leads to better (leva a melhor) etc. The analysis reveals that thej ournalists in the observed newspaper use figurative language and trigger phraseologies as a mechanism to get closerto their readers.O objetivo deste artigo consiste em apresentar e analisar unidades fraseológicas publicadas em manchetes de um jornal de grande circulação no Estado do Pará. Para tanto, o trabalho está fundamentado na corrente francesa dos estudos fraseológicos conforme Mejri (1997; 2012), sobretudo no que concerne à adoção dos critérios apontados por esse autor, quais sejam: polilexicalidade, fixidez, congruência, frequência, previsibilidade e idiomaticidade, os quais possibilitam identificar e realizar a tipologia dos exemplos encontrados. A pesquisa de caráter exploratório e descritivo (GIL, 2017) apresenta amostra coletada a partir de manchetes jornalísticas extraídas da versão eletrônica do Jornal O Liberal publicadas no mês de setembro de 2019. Os resultados apontam 24 fraseologismos, tais como: abre o jogo, leva a melhor, o choro é livre, propor o jogo, teto de vidro etc. A análise revela que a linguagem figurada materializada pelos fraseologismos empregados nas manchetes é acionada como um mecanismo de aproximação com os leitores
- …
