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Search Results: 1 - 10 of 4069 matches for " Adrian Rivi? "
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Basic surface-active properties in the homologous series of beta-alkyl (C12H25/C18H37) polyethyleneoxy (n = 0-20) propionamides
Adrian Rivi, Gabriel Bujanca, Teodor Tra?c?
Chemistry Central Journal , 2013, DOI: 10.1186/1752-153x-7-31
Abstract: In the series of basic colloidal characteristics investigated the structure-surface activity dependence is confirmed. Their indicative character for R(EO)nPD is based on the assumption that the structures studied are not unitary (heterogeneous) because: a) the hydrophobic chains C12H25/C18H37 have been grouped in two variants, C12H25/C14H29 (LM); C16H33/C18H37 (CS), each with an internal mass ratio of 7/3; b) the hydrophilic polyoxyethylene chains (n = 3-20) have polydisperse character; the meaning and value the oligomerization degree, n, is that of weighted average. In these conditions the surface tension increases proportionally with the oligomerization degree of the polyoxyethylene chain, while the critical micelle concentration decreases in the same homologous series as well as with the increase of the hydrophobic chain in the C12H25 to C18H37 series. A mechanism of micellization is proposed, consistent with the experimental data recorded and the hypotheses known from the consulted literature.The idea of the obtaining and basic colloidal characterization of heterogeneous R(EO)nPD is justified. The knowledge and constructive approach of the heterogeneous character confirm the basic surface-active potential of R(EO)nPD, the structure-colloidal characteristics dependence and justifies further, more extensive research.
Titanocene / cyclodextrin supramolecular systems: a theoretical approach
Adrian Rivi, Nicoleta G H?d?rug?, Zeno Garban, Daniel I H?d?rug?
Chemistry Central Journal , 2012, DOI: 10.1186/1752-153x-6-129
Abstract: This study presents a theoretical approach on the nanoencapsulation of a series of titanocenes with cytotoxic activity in α-, β-, and γ-cyclodextrin. The HyperChem 5.11 package was used for building and molecular modelling of titanocene and cyclodextrin structures, as well as for titanocene/cyclodextrin complex optimization. For titanocene/cyclodextrin complex optimization experiments, the titanocene and cyclodextrin structures in minimal energy conformations were set up at various distances and positions between molecules (molecular mechanics functionality, MM+). The best interaction between titanocene structures and cyclodextrins was obtained in the case of β- and γ-cyclodextrin, having the hydrophobic moieties oriented to the secondary face of cyclodextrin. The hydrophobicity of titanocenes (logP) correlate with the titanocene-cyclodextrin interaction parameters, especially with the titanocene-cyclodextrin interaction energy; the compatible geometry and the interaction energy denote that the titanocene/β- and γ-cyclodextrin complex can be achieved. Valuable quantitative structure-activity relationships (QSARs) were also obtained in the titanocene class by using the same logP as the main parameter for the in vitro cytotoxic activity against HeLa, K562, and Fem-x cell lines.According to our theoretical study, the titanocene/cyclodextrin inclusion compounds can be obtained (high interaction energy; the encapsulation is energetically favourable). Further, the most hydrophobic compounds are better encapsulated in β- and γ-cyclodextrin molecules and are more stable (from energetically point of view) in comparison with α-cyclodextrin case. This study suggests that the titanocene / β- and γ-cyclodextrin complexes (or synthetically modified cyclodextrins with higher water solubility) could be experimentally synthesized and could have enhanced cytotoxic activity and even lower toxicity.Cancer is a generic name comprises a great number of medical affections, having various
Culture inavouée dans la nature, nature soumise dans la culture
Rivière, Claude;
Horizontes Antropológicos , 2001, DOI: 10.1590/S0104-71832001000200002
Abstract: on peut tirer de l'idée que l'on se fait de la nature, soit une apologie de l'ordre dans le cosmos, soit un argument pour justifier l'existence d'un dieu ma?tre de la foudre et des saisons, soit l'enchantement d'un retour à l'état de nature supposé non conflictuel, soit enfin une conviction matérialiste selon laquelle l'homme doit dompter sa gourmandise et assurer la survie optimale de l'environnement sans le polluer. la société n'est pas à penser comme une modalité d'oubli de la nature mais en rapport d'inclusion dans la nature. après périple philosophique de platon à moscovici, on déviera dans le champ des artistes peignant d'après nature et dans celui des linguistes analysant ce qui est dit contre nature. c'est la culture qui oppose nature et convention, fait et norme, matière et liberté humaine. c'est elle aussi qui nous fournit notre vocabulaire, nos classifications et nos jugements de valeur à propos de la nature. récemment un courant écologiste se pose en protecteur sourcilleux de l'environnement et en organisateur d'un développement durable, mais dans la deep ecology, on glisse vers le culte d'une biosphère de rêve.
A preda??o, a reciprocidade e o caso das Guianas
Rivière, Peter;
Mana , 2001, DOI: 10.1590/S0104-93132001000100003
Abstract: this paper is based on descola's argument that there is an homology between the way in which people treat nature and the way in which they treat each other. he contrasts the jivaroan peoples with the tukanoans; the former organizing the relationship in terms of predation, the latter reciprocity. a third contrast in the form of the guiana region is introduced and it is hypothesized that a degree of self-containment, an isolation from nature, will be found there. in fact it is, but it also possible to identify, depending on data and context, predatory and reciprocal relationships with nature or the outside. it is suggested that this is likely to be generally the case.
A preda o, a reciprocidade e o caso das Guianas
Rivière Peter
Mana , 2001,
Abstract: Este artigo se baseia no argumento de Philippe Descola de que há uma homologia entre a maneira como as pessoas tratam a natureza e a maneira como se tratam entre si. Ele contrasta os povos jívaro e tukano - o primeiro organizando a rela o em termos de preda o, o último em termos de reciprocidade. é introduzido um terceiro elemento na compara o: a regi o das Guianas, onde se encontraria, segundo a hipótese aqui formulada, um certo grau de autoconten o do grupo social e de isolamento diante da natureza. Isto de fato é verdade, mas é também possível identificar, dependendo dos dados e do contexto, rela es predatórias e recíprocas com a natureza ou o exterior. é ent o sugerido que este seja n o apenas o caso das Guianas, mas da Amaz nia de um modo geral.
Une géographie politique de l'espace numérique?
Jean Rivière
M@ppemonde , 2007,
Abstract: Certains analystes d’Internet emploient de multiples termes à forte connotation géographique pour décrire son organisation. Le champ politique fran ais, tel qu’il est structuré sur le web autour des grandes familles et sensibilités politiques, appara t pour certains comme un espace qui peut donner lieu à une cartographie . L’étude critique du travail effectué par l’observatoire de la présidentielle 2007 sur la blogosphère politique montre que l’espace politique numérique est plut t un espace social au sens de Bourdieu qu’un espace géographique.
Georges-Claude Guilbert. Carson McCullers. Amours décalées.
Yvette Rivière
Transatlantica : Revue d'études Américaines , 2006,
Abstract: Avec le recul, on redécouvre Carson McCullers et l’on tente de lui rendre justice. Après l’édition annotée par Marie-Christine Lemardeley-Cunci de nouvelles traductions de la romancière (La Pochothèque 1994) et la flamboyante biographie de Josyane Savigneau (Stock 1995), Georges-Claude Guilbert s’attache dans le format ramassé du petit Belin à la défendre contre ses détracteurs. Il glisse sur les détails biographiques qui relèvent du voyeurisme et se démarque des traditionnels couplets su...
Le Traité de Lisbonne remet-il l’Europe sur les rails ?
Dominique Rivière
EchoGéo , 2008,
Abstract: Le Traité de Lisbonne doit débloquer la construction européenne. Mais la crise dans laquelle s’est enlisée celle-ci renvoie à diverses échelles de temps et causalités, qui sont plus ou moins aisées à dépasser. Par ailleurs, le Traité modifie la gouvernance européenne en marquant un retour des Etats, et en entérinant le principe d’une Europe à géométrie variable. Il apporte une solution au problème de la représentation de la diversité des Etats, mais on devra attendre 2014 voire 2017 pour sa mise en pratique. The Treaty of Lisbon is supposed to "release" the European construction. But the crisis into which got stuck this process is linked to various scales of time and causalities, which are more or less easy to reduce. Moreover, the Treaty changes the european governance by marking a return of States and by ratifying the principle of Europe with variable geometry . It brings a resolution in the problem of the representation of the diversity of States, but they will have to wait for 2014 or even on 2017 for his putting into practice.
Après le non irlandais
Dominique Rivière
EchoGéo , 2008,
Abstract: Le Traité de Lisbonne a été rejeté par référendum en Irlande le 12 juin 2008. Loin d’être un incident de parcours, le vote irlandais est symptomatique d’un divorce persistant entre opinions publiques et projet européen.Parmi les issues possibles, la plus probables est néanmoins celle de la poursuite de la ratification qui serait assortie d’un nouveau vote irlandais. The Treaty of Lisbon has been rejected by the referendum of the 12 of june 2008. Far away from being a mere incident , this votation is symptomatic of a persistent divorce between the public opinions and the european project. Nevertheless, the most probale issue is the proceeding of the ratification process which would be accompanied with a new vote in Irland.
Fabre Daniel, Iuso Anna, (Dir.), Les monuments sont habités
Claude Rivière
Recherches Sociologiques et Anthropologiques , 2011,
Abstract: Un coup fumant en couverture ! Une pyramide pharaonique, au pied de laquelle un touriste a laissé sa twingo verte, laisse échapper d’une cheminée un joli panache. Hello, mon vieux Kheops !... Pilote de la recherche patrimoniale au Ministère de la Culture, C. Hottin énonce d’abord sa mission monumentale de sauvegarde de chateaux et cités en adoptant le point de vue de D. Fabre sur la dynamique : déclassement du stigmate – classement comme mémoire – sur-classement pour une glorification, ainsi ...
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