Synergistic extraction of zinc(II) with mixtures of CA-100 and cyanex 272

The extraction of zinc(II) from an aqueous chloride medium has been studied using mixtures of sec-nonylphenoxy acetic acid (CA-100) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272). The results demonstrate that zinc ion is extracted into heptane as ZnA(2).2HA with CA-100, ZnL2.2HL with Cyanex 272, and ZnA(2)L(2)H(2) with synergistic mixture. The equilibrium constants of the these species have been calculated and extraction mechanisms have been proposed. Thermodynamic parameters of the extraction process were determined by the temperature coefficient of extractability. The synergistic system enhances the extraction efficiency of zinc(II) and also improves the selectivity between zinc(II) and cadmium(II).

Extraction and separation of heavy rare earth (III) with Extraction Resin containing di(2,4,4-trimethyl pentyl) phosphinic acid (Cyanex 272)

Extraction resins, of the type of;levextrel, (which is a collective term for styrene/divinylbenzene based copolymers of predominantly macroporous structure that contain a selective extractant) are important for the recovery and separation of metal ions, as they combine features of solvent extraction and ion exchange resins. This paper presents the results of the adsorption of heavy rare earth ions (Ho(III), Er(III), Tm(III), Yb(III), Lu(III) and Y(III)) from hydrochloric acid solutions at 0.2 mol/L ionic strength and 50 degrees C by the extraction resin containing di (2,4,4-trimethyl pentyl) phosphinic acid (Cyanex 272) and the chromatographic separation of (Er(III), Tm(III) and Yb(III)). Technological separation products, with purity and yield of Tm2O3 >99.97%, >80%, Er2O3 >99.9%, >94% and Yb2O3 >99.8%, >80% respectively, have been obtained from a feed having the composition Tm2O3 60%, Er2O3 10%, and Yb2O3 3%, the others 27%. The distribution coefficients, extraction equilibrium constants and separation factors have been determined as a function of acidity, loading of the resin and rare earths, flow rates and column ratios. The resolutions and efficiencies of separation of Er/Tm/Yb each other have been calculated. The stoichiometry of the extraction of rare earth ions has been suggested as well.

Kazimierz Denek, Wycieczki we współczesnej szkole, Wyd. „Eruditus", Poznań 1997, ss. 272.

Recenzje i sprawozdania z książek

Annotation of Case C-272/94, Criminal proceedings against Michel Guiot and Climatec SA, ECR 1996 I-1905

Employer's contributions - Loyalty stamps - Bad-weather stamps - Freedom to provide services - Posted Workers

Resolución No. 024. ¿Cuales son los criterios en los cuales se fundamenta la Cámara de Comercio para el estudio de escrituras públicas que contienen sujetos a registro?

Servicios registrales

Resolución No. 024 del 26 de febrero de 2014 ¿En qué circunstancias y cómo debe hacerse la convocatoria para la asamblea de accionistas por parte de la Superintendencia de Sociedades?

La Cámara de Comercio de Bogotá inscribió el acta No. 152 AG de la asamblea de accionistas de la sociedad ORGANIZACIÓN SANITAS INTERNACIONAL S.A., en la cual se hizo nombramiento de la junta directiva en la sociedad mencionada. Contra este acto administrativo, presentó recurso de reposición el agente oficioso de algunos accionistas y uno de los miembros principales de la junta directiva de la sociedad.

L'Interdit – no 272, janv./fév. 1980

Pour toute demande de reproduction de contenu se trouvant dans cette publication, communiquer avec l’Association des diplômés de l’UdeM.

Ordenamiento territorial y perspectivas de un nuevo orden político desde la Constitución de 1991: análisis del Proyecto de Ley 024 de 2007

El presente trabajo tiene como objetivo analizar el proyecto de ley 024 del 2007, presentado por el representante Orlando Guerra de la Rosa, en la Comisión Primera de la Cámara de Representantes del Congreso de la República, el cual tenía como objetivo la creación de la Ley Orgánica de Ordenamiento Territorial. Desde esa perspectiva, se realiza el estudio de la coyuntura que lo enmarcó, los retos y problemas que pretendía resolver dicho proyecto, y las razones por las cuales el proyecto no logró la aprobación de la Cámara. Adicionalmente, se estudia la importancia del Ordenamiento Territorial en el país, junto con las ventajas y desventajas que proponía el proyecto de ley en comento.

The quassinoid derivative NBT-272 targets both the AKT and ERK signaling pathways in embryonal tumors

The quassinoid analogue NBT-272 has been reported to inhibit MYC, thus warranting a further effort 7to better understand its preclinical properties in models of embryonal tumors (ET), a family of childhood malignancies sharing relevant biological and genetic features such as deregulated expression of MYC oncogenes. In our study, NBT-272 displayed a strong antiproliferative activity in vitro that resulted from the combination of diverse biological effects, ranging from G(1)/S arrest of the cell cycle to apoptosis and autophagy. The compound prevented the full activation of both eukaryotic translation initiation factor 4E (eIF4E) and its binding protein 4EBP-1, regulating cap-dependent protein translation. Interestingly, all responses induced by NBT-272 in ET could be attributed to interference with 2 main proproliferative signaling pathways, that is, the AKT and the MEK/extracellular signal-regulated kinase pathways. These findings also suggested that the depleting effect of NBT-272 on MYC protein expression occurred via indirect mechanisms, rather than selective inhibition. Finally, the ability of NBT-272 to arrest tumor growth in a xenograft model of neuroblastoma plays a role in the strong antitumor activity of this compound, both in vitro and in vivo, with its potential to target cell-survival pathways that are relevant for the development and progression of ET.

Na 50 Nachlass Arthur Schopenhauer - 'Schopenhauer-Archiv', 272 - Postkarte und Dankesschreiben an den Professor Hugo von Meltzl wegen der Hilfestellung bei der Veröffentlichung eines Artikels

u.a.: David Asher; Arthur Schopenhauer;

Ms.Ff.F.Stoltze 3. 272 - Brief von Ernst Schalck an Friedrich Stoltze

Umzug, Frankfurter Latern

Ms. lat. oct. 272 - Venezianische Magistrate

Vorbesitzer: Johann Hieronymus Zum Jungen