Search results for "CRA"
showing 10 items of 4890 documents
Live imaging of developmental processes in a living meristem of Davidia involucrata (Nyssaceae).
2014
Morphogenesis in plants is usually reconstructed by scanning electron microscopy and histology of meristematic structures. These techniques are destructive and require many samples to obtain a consecutive series of states. Unfortunately, using this methodology the absolute timing of growth and complete relative initiation of organs remain obscure. To overcome this limitation, an in vivo observational method based on Epi-Illumination Light Microscopy (ELM) was developed and tested with a male inflorescence meristem (floral unit) of the handkerchief tree Davidia involucrata Baill. (Nyssaceae). We asked whether the most basal flowers of this floral unit arise in a basipetal sequence or, altern…
Correlazione tra indici di freschezza e tecniche di pesca artigianali (“a cianciolo”) di specie di pesce azzurro (E. Encrasicolus, S. Pilchardus)
2012
Access to Higher Education: An Instrument for Fair Societies?
2019
Access to higher education (HE) has a long history. To offer a view on the current debates and worldwide issues regarding access to HE, this editorial depicts how the control of educational access has historically been used as an instrument of governance at the interface of two processes: social stratification and the territorialisation of politics. Access to HE has remained embedded in these large structural processes even though HE has expanded from a highly elitist institution into mass education systems with equity of educational opportunities having become a desirable goal across societies. Analysing these processes helps understand the complex mechanisms producing inequalities in HE t…
Recensión obra de Byung-Chul, HAN, Infocracia, la digitalización y la crisis de la democracia., Editorial Taurus, Santiago de Chile, 2022
2023
Esta última obra de Byung-Chul Han, no puede dejar indiferente a na-die, como la mayoría de las obras del autor. La realidad es analizada desde la rigurosidad académica que le distingue, a través de un lenguaje sencillo, que llega al gran público con extrema facilidad, quizás por su posición como profesor en la Universidad de las Artes de Berlín, tratar temas complejos de forma sencilla, es una cualidad difícil de encontrar, que Han desarrolla de maravilla.En esta oportunidad el profesor Han denuncia la crisis de la democracia liberal, señalando que la esfera pública y la opinión pública, se encuentran en una mutación constante gracias a los vastos procesos de digitalización de la comunicac…
Catalytic activity of solvated and unsolvated lanthanide halides in Friedel–Crafts acylations
2000
Abstract Anhydrous lanthanide halides — chlorides and bromides — can act as homogeneous catalysts of Friedel–Crafts acylations. The catalytic activity is related to the solubility of these anhydrous salts. More soluble THF or dioxane (Diox.) neodymium and samarium adducts are more active catalysts.
UraniumIV and uranyle salts, efficient and reusable catalysts for acylation of aromatic compounds
2000
Abstract Uranium tetrachloride, uranyle chloride, fluoride and also nitrate or acetate are very efficient homogeneous catalysts for the Friedel–Crafts acylation of aromatic compounds. With uranyle salts, the reaction, carried under dry air, is highly specific and the mono- or bisacylation products are obtained in high yield. Uranyle catalyst can be quantitatively recovered and reused and the organic products are obtained free of uranium.
Friedel-Crafts catalytic alkylations using rare earth-based mineral supports
1998
Abstract Rare earth halides supported on mineral supports (K10 montmorillonite and silica) were investigated as catalysts for Friedel-Crafts alkylations. This project concerns the replacement of the widely used Lewis acid AlCl3 in Friedel-Crafts reactions by environmentally friendly catalysts in that they circumvent the production of aluminum waste. The catalytic activity of these heterogeneous catalysts was established in a series of alkylations of aromatic compounds.
Design implications for digital scratch-card games
2008
Le dilemme de l'ingénierie territoriale : socialiser les instruments d'action publique ou instrumentaliser la société?
2010
International audience; L'étude de l'ingénierie territoriale dans le Pays Beaujolais et Roannais en Rhône Alpes met en lumière une tendance à la recentralisation de la gestion publique territoriale. L'ingénierie territoriale est une bureaucratie professionnelle coincée entre les injonctions autoritaires de l’état et les velléités d'autonomie du pouvoir local. D'une part, l'Europe, les services centraux de l'état, dans la continuité du processus d'agencification des administrations diffusent des représentations du territoire et des bonne pratiques managériales aussi strictes que les règles du modèle bureaucratique wébérien. D'autre part, les pouvoirs locaux, face aux insuffisances des servic…