La enseñanza de "colocaciones" en español como L2: una propuesta didáctica

Lexical collocations are groups of two or more words that come up together on a regular basis. In non-native language teaching, in general, and in the teaching of Spanish as an L2, in particular, it seems necessary to pay attention to this linguistic feature from a pedagogical point of view. Failure in the production of appropriate lexical collocations does not usually lead L2 learners to a communication breakdown, but students tend to produce unnecessary circumlocutions when trying to convey their messages. This study provides an overall perspective to the analysis of lexical collocations, takes up previous research on the topic and makes use of mental maps as a convenient teaching technique. Some teaching materials were designed and used with a group of students of Spanish as an L2. In this paper we report the effects of this empirical intervention and draw some pedagogical implications for the teaching of lexical collocations in Spanish as an L2

La docència a la UIB: el seu context

Abstract not availabl

Sugar-based bicyclic monomers for aliphatic polyesters: a comparative appraisal of acetalized alditols and isosorbide

Three series of polyalkanoates (adipates, suberates and sebacates) were synthesized using as monomers three sugar-based bicyclic diols derived from D-glucose (Glux-diol and isosorbide) and D-mannose (Manx-diol). Polycondensations were conducted in the melt applying similar reaction conditions for all cases. The aim was to compare the three bicyclic diols regarding their suitability to render aliphatic polyesters with enhanced thermal and mechanical properties. The ensuing polyesters had molecular weights (Mw) in the 25,000–50,000 g mol-1 range with highest values being attained for Glux-diol. All the polyesters started to decompose above 300 °C and most of them did not display perceivable crystallinity. On the contrary, they had glass transition temperatures much higher than usually found in homologous polyesters made of alkanediols, and showed a stress– strain behavior consistent with their Tg values. Glux-diol was particularly effective in increasing the Tg and to render therefore polyesters with high elastic modulus and considerable mechanical strength.Peer ReviewedPostprint (published version

Intento de homicidio con raticida : a propósito de un caso

los rodenticidas del grupo de las superwarfarinas, son pesticidas que actúan como anticoagulantes provocando la muerte del roedor por hemorragia. Debido a su amplio uso en numerosos países, está aumentando la incidencia de intoxicación en humanos, la mayoría de las veces de origen accidental. En este artículo, presentamos el caso de una intoxicación por intento de homicidio mediante bromadiolona, superwarfarina del grupo de las hidroxicumarinasRat poisons from the super-warfarin group are pesticides that act as anticoagulants, provoking the rodent’s death by hemorrhage. Due to the widespread use of these rodenticides in many countries, the incidence of intoxication in humans is increasing, usually due to accidental ingestion. In this article we present a case of intoxication due to attempted homicide with bromadiolone, a superwarfarin from the group of hydroxycoumarins

Isomannide-containing poly(butylene 2,5-furandicarboxylate) copolyesters via ring opening polymerization

Cyclic oligomers of isomannide 2,5-furandicarboxylate were synthesized using the high dilution condensation method. A mixture of dimer, trimer, and tetramer species largely enriched in dimer was obtained. These cyclic oligomers were made to react with oligo(butylene 2,5-furandicarboxylate) in bulk at 220 °C by ring opening polymerization using Sn(Oct)2 as a catalyst. A series of random poly(butylene 2,5-furandicarboxylate) copolyesters containing isomannide in a range of 5–50 mol % and with weight-average molecular weights between 30,000 and 50,000 g·mol–1 were prepared. These copolyesters started to decompose above 300 °C, and only those containing less than 10 mol % of isomannide showed signs of crystallinity. They displayed glass-transition temperatures in the 40–100 °C range with values increasing steadily with the content in isomannide. At difference with poly(butylene 2,5-furandicarboxylate) homopolyester that is reluctant to undergo hydrolysis, the isomannide-containing copolyesters were noticeably degraded by water, much more rapidly when exposed to lipases.Peer ReviewedPostprint (author's final draft