Analytical pyrolysis (Py-GC/MS) at 500 ºC was applied to study wood composition of Eucalyptus species (E. grandis, E. dunnii and E. benthamii) which are relevant for pulping in Uruguay. Multivariate data treatments mainly principal component analysis and discriminant analysis with automatic backwards variable selection were used to explore differences between the original wood cultivars. Multivariate analyses with automatic backwards variable selection indicated that simplified methoxyphenol patterns (up to 10 compounds) are sufficient for wood discrimination in terms of species and geographical origin but also with purposes of forecasting the ease of delignification of the resulting pulps measured as active alkali. No additional chemotaxonomical accuracy was achieved when the data sets were enlarged with carbohydrate-derived products. On the other side, discriminant or forecasting models were much less significant when based on individual diagnostic compounds, groups of compounds, or the classical syringyl-to-guaiacyl (SG) ratio. Principal component analysis indicated that the variability in lignin composition due to bioclimatic variations (spatial replications) was more significant than that due to phylogenetic differences (species and cultivars).

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Three further minor isoflavonoid components (1-3) of the dichloromethane extract of Desmodium canum root have been isolated: two of them are complex isoflavanones with structures 1 and 2 biogenetically related to the previously isolated compounds 1a and 2a. The third is a complex isoflavan where the isoprenyl substituent and the aromatic A-ring yielded a p-quinol nucleus.

Se presentan los primeros resultados del análisis del material faunístico y cerámico recuperado en excavaciones realizadas en la Estructura 4 del sitio Corral Grande 1 (cuenca inferior del Río Mojones) en el departamento de Antofagasta de la Sierra (Catamarca, Puna Meridional Argentina). El objetivo es profundizar en el conocimiento de las características de la economía, tecnología y uso del espacio de las sociedades agropastoriles tempranas del área (ca. 3000-1100 años AP). Los datos obtenidos evidencian una ocupación agropastoril estable, con una tecnología cerámica utilizada para actividades de almacenaje, cocción y servicio de alimentos, mientras que la cerámica decorada es coincidente con aquella correspondiente al periodo Formativo Tardío (1700-1100 años AP) del resto de la región. Asimismo, el análisis zooarqueológico permitió registrar diferentes estrategias para la obtención de recursos faunísticos (pastoreo y caza), destacándose una alta incidencia de recursos silvestres. Por último, los resultados obtenidos apuntan a la existencia de actividades múltiples desarrolladas en la Estructura 4, la cual podría haber funcionado como un patio de actividades externas con indicios que sugieren una ocupación recurrente y/o una alta permanencia en el lugar.Palabras claves: sociedades agropastoriles, zooarqueología, análisis cerámico, Puna argentina.This article presents the preliminary results of a faunal and ceramic analysis of material recovered from excavations carried out in Structure 4 (E4) of the Corral Grande 1 site (lower Mojones River basin), located in the Department of Antofagasta de la Sierra (Catamarca, southern Argentine Puna). We aim to deepen our understanding of the economy, technology, and use of space by early agropastoralist societies in the area (ca. 3000-1100 years BP).The data recovered shows a stable agropastoralist occupation with ceramic technology that was used for storage, cooking, and food-servicing activities. The decorated ceramic uncovered corresponds to regional Late Formative Period types (1700-1100 years BP). Concomitantly, zooarchaeological analysis has allowed us to register diversified economic strategies with a high degree of resources being obtained through hunting. Finally, the results suggest that multiple activities were carried out within Structure 4 over the long term, with the structure functioning as a patio for external activities.