309 research outputs found
Interviews with SIG/III Co-founders: Reflections of Toni Carbo and Michel Menou
No full textArticle discussing interviews with the Special Interest Group/International Information Issues (SIG/III) co-founders Toni Carbo and Michel Menou
Recommended from our members
Interviews with SIG/III Co-founders: Interview with Michel Menou
No full textVideo interview with the Association for Information Science and Technology (ASIS&T) Special Interest Group/International Information Issues (SIG/III) co-founder Michel Menou
La alfabetización informacional dentro de las políticas nacionales sobre tecnologías de la información y comunicación (TICs): la cultura de la información, una dimensión ausente
No full textMost national and international development policies have now made ample room for the application of ICT and transition toward the information society. Within each country as well as among them, inequalities in access and use (usually referred to as “digital divide”) are seen as a major threat. In addition to securing “universal access," information literacy is a major component of these efforts. A number of examples mostly drawn from Latin America illustrate the patterns in addressing information literacy issues. The emphasis upon use of computers and more generally the quite narrow perspective of these programs makes them look far more an exercise for “retooling” the workforce than empowering citizens. It is advocated that the potential of the Information Age cannot be realised without expanding the scope of information and computer literacy far beyond their usual, functional aspects. What is at stake is the formation of an information culture, which itself involves the adaptation of pre-existing cultures. In other words a cultural revolution assumed by the actors rather than a cultural involution pushed by the global media. In conclusion a few requirements for such a new course are outlined.
White Paper prepared for UNESCO, the U.S. National Commission on Libraries and Information Science, and the National Forum on Information Literacy, for use at the Information Literacy Meeting of Experts, Prague, The Czech Republic. Disponible en: http://www.nclis.gov/libinter/infolitconf&meet/papers/menou-fullpaper.pdf.
Translated by Cristóbal Pasadas Ureña
STARFISH SAPONINS .18. STEROIDAL GLYCOSIDE SULFATES FROM THE STARFISH LINCKIA-LAEVIGATA
No full textThe asterosaponins of the Pacific starfish L. laevigata were sepd. into 5 compds. Four of them are known: thornasteroside A, marthasteroside A1, ophidianoside F, and maculatoside. The 5th minor component, named laevigatoside, is new and was characterized as 6α-O-[β-fucopyranosyl-(1 → 2)-α-arabinopyranosyl-(1 → 4)-[(β-quinovopyranosyl-(1 → 2)]-β-quinovopyranosyl-(1 → 3)-β-quinovopyranosyl]-20-hydroxy-23-oxo-5α-cholest-9(11)-en-3β-yl Na sulfate
Preuves de l'histoire de la maison de Menou / par A.-F.-J. Borel d'Hauterive ; sous la direction du Cte Jules de Menou
No full textAvec mode text
STARFISH SAPONINS .23. STEROIDAL GLYCOSIDES FROM THE STARFISH HALITYLE-REGULARIS
No full textEight new steroidal glycosides were isolated from the starfish H. regularis. Three compds. contain the 2,4-di-O-methyl-β-D-xylopyranosyl-(1→2)-α-L-arabinofuranosyl disaccharide moiety, which is attached at C-24 of polyhydroxysteroid aglycons. Another 3 glycosides have polyhydroxylated 24-(β-hydroxyethyl) steroid aglycons with the disaccharide moieties, 2-O-methyl-β-D-xylopyranosyl-(1→2)-β-D-xylopyranosyl or 2,4-di-O-methyl-β-D-xylopyranosyl-(1→2)-α-L-arabinofuranosyl, located at the primary hydroxyl group at C-29. Unlike the other compds., the other 2 glycosides have a sulfate group. These glycosides are accompanied by 2 nonglycosidated polyhydoxylated sterols, i.e., (25S)-5α-cholestane-3β,6α,8,15β,26-hexol and (25S)-5α-cholestane-3β,4β,6α,8,15β,26-heptol. The structures of the new metabolites were detd. by interpretation of spectral data, comparison with related glycosides described previously, and chem. transformations
STARFISH SAPONINS .16. COMPOSITION OF THE STEROIDAL GLYCOSIDE SULFATES FROM THE STARFISH LUIDIA-MACULATA
No full textThornasteroside A, maculatoside (I), marthasteroside A2, marthasteroside B, and marthasteroside C were isolated from L. maculata by extn. and chromatog. on Amberlite XAD-2, Sephadex LH-60, Sephadex LH-20, and anal. HPLC on μ-Bondapack C18. The structures of the saponins were detd. by 1H- and 13C-NMR and chem. analyses. Thornasteroside A was previously isolated from Acanthaster planci, whereas the marthasterosides were previously isolated from Marthasterias glacialis
STARFISH SAPONINS .22. ASTEROSAPONINS FROM THE STARFISH HALITYLE-REGULARIS - A NOVEL 22,23-EPOXYSTEROIDAL GLYCOSIDE SULFATE
No full textA new sulfated asterosaponin, regularoside A (I), contg. the (20R,22R,23S,24S)-22,23-epoxy-24-methyl-5α-cholesta-9(11)-ene-3β,6α,20-triol aglycon, was isolated from the Pacific starfish H. regularis. The sulfate residue is at C-3, and the oligosaccharide chain, β-D-fucopyranosyl(1→2)-β-D-quinovopyranosyl(1→4)[β-D-quinovopyranosyl(1→2)]-β-D-quinovopyranosyl(1→3)-β-D-glucopyranosyl, is at C-6. I co-occurs with the common thornasteroside A (II) and the novel regularoside B (III). III also has thornasterol A as its aglycon and the oligosaccharide chain is β-D-fucopyranosyl(1→2)-β-D-fucopyranosyl(1→4)[β-D-quinovopyranosyl(1→2)]-β-D-xylopyranosyl(1→3)-β-D-quinovopyranosyl. The structures of I and III were detd. by 3H- and 13C-NMR combined with chem. degrdn. anal
A formação crítica do sujeito na educação a distância
No full textTese (doutorado) - Universidade Federal do Rio de Janeiro, Instituto de Pesquisa e Planejamento Urbano e Regiona
- …
