DivIVA is required for polar growth in the MreB-lacking rod-shaped actinomycete Corynebacterium glutamicum.

The actinomycete Corynebacterium glutamicum grows as rod-shaped cells by zonal peptidoglycan synthesis at the cell poles. In this bacterium, experimental depletion of the polar DivIVA protein (DivIVA(Cg)) resulted in the inhibition of polar growth; consequently, these cells exhibited a coccoid morphology. This result demonstrated that DivIVA is required for cell elongation and the acquisition of a rod shape. DivIVA from Streptomyces or Mycobacterium localized to the cell poles of DivIVA(Cg)-depleted C. glutamicum and restored polar peptidoglycan synthesis, in contrast to DivIVA proteins from Bacillus subtilis or Streptococcus pneumoniae, which localized at the septum of C. glutamicum. This confirmed that DivIVAs from actinomycetes are involved in polarized cell growth. DivIVA(Cg) localized at the septum after cell wall synthesis had started and the nucleoids had already segregated, suggesting that in C. glutamicum DivIVA is not involved in cell division or chromosome segregation.

Victoria en Germania. Tomás Luis de Victoria y la historiografía alemana hasta principios del siglo XX

Es war bisher unbekannt, dass die deutschsprachige Musikhistoriographie dem Komponisten Tomás Luis de Victoria relativ viel Beachtung geschenkt hat. Als iberischer Counterpart des Heroen Palestrina spielt er bei der Gestaltung eines Geschichtsbildes der musikalischen Renaissance daher eine viel wichtigere Rolle als bisher vermutet. Die Auseinandersetzung deutscher Musikwissenschaftler mit Victoria spielte eine zentrale Rolle bei der Würdigung des Komponisten durch die spanische Historiographie.

Der jüdische Gil Blas

hrsg. u. mit Anmerkungen begleitet v. einem Unbefangenen [Selig Korn]

Pinus nigra (European black pine) as the dominant species of the last glacial pinewoods in south-western to central Iberia: a morphological study of modern and fossil pollen

Aim Our aim was to discriminate different species of Pinus via pollen analysis in order to assess the responses of particular pine species to orbital and millennial-scale climate changes, particularly during the last glacial period. Location Modern pollen grains were collected from current pine populations along transects from the Pyrenees to southern Iberia and the Balearic Islands. Fossil pine pollen was recovered from the south-western Iberian margin core MD95-2042. Methods We measured a set of morphological traits of modern pollen from the Iberian pine species Pinus nigra, P. sylvestris, P. halepensis, P. pinea and P. pinaster and of fossil pine pollen from selected samples of the last glacial period and the early to mid-Holocene. Classification and regression tree (CART) analysis was used to establish a model from the modern dataset that discriminates pollen from the different pine species and allows identification of fossil pine pollen at the species level. Results The CART model was effective in separating pollen of P. nigra and P. sylvestris from that of the Mediterranean pine group (P. halepensis, P. pinea and P. pinaster). The pollen of Pinus nigra diverged from that of P. sylvestris by having a more flattened corpus. Predictions using this model suggested that fossil pine pollen is mainly from P. nigra in all the samples analysed. Pinus sylvestris was more abundant in samples from Greenland stadials than Heinrich stadials, whereas Mediterranean pines increased in samples from Greenland interstadials and during the early to mid-Holocene. Main conclusions Morphological parameters can be successfully used to increase the taxonomic resolution of fossil pine pollen at the species level for the highland pines (P. nigra and P. sylvestris) and at the group of species level for the Mediterranean pines. Our study indicates that P. nigra was the dominant component of the last glacial south-western/central Iberian pinewoods, although the species composition of these woodlands varied in response to abrupt climate changes.

Unearthing the roots of degradation of Quercus pyrenaica coppices: A root-to-shoot imbalance caused by historical management?

Slow growth, branch dieback and scarce acorn yield are visible symptoms of decay in abandoned Quercus pyrenaica coppices. A hypothetical root-to-shoot (R:S) imbalance provoked by historical coppicing is investigated as the underlying driver of stand degradation. After stem genotyping, 12 stems belonging to two clones covering 81 and 16 m2 were harvested and excavated to measure above- and below-ground biomass and nonstructural carbohydrate (NSC) pools. To study root system functionality, root connections and root longevity were assessed by radiocarbon analysis. Seasonality of NSC was monitored on five additional clones. NSC pools, R:S biomass ratio and fine roots-to-foliage ratio were higher in the large clone, whose centennial root system, estimated to be 550 years old, maintained large amounts of sapwood (51.8%) for NSC storage. 248 root connections were observed within the large clone, whereas the small clone showed comparatively simpler root structure (26 connections). NSC concentrations were higher in spring (before bud burst) and autumn (before leaf fall), and lower in summer (after complete leaf expansion); they were always higher in roots than in stems or twigs. The persistence of massive and highly inter-connected root systems after coppicing may lead to increasing R:S biomass ratios and root NSC pools over time. We highlight the need of surveying belowground organs to understand aboveground dynamics of Q. pyrenaica, and suggest that enhanced belowground NSC storage and consumption reflect a trade-off between clonal vegetative resilience and aboveground performance.

Martin Luis Guzman: Adler und Schlange [Rezension]

N.

Luis Trenker, Brustbild

Signatur des Originals: S 36/F06878

Jorge Luis Borges y la nostalgia de las orillas

Este trabajo indaga en torno a la atracción por el suburbio y sus personajes más característicos –tal el compadrito- que se manifiesta en la obra de Jorge Luis Borges. En primer lugar, analiza la presencia del barrio como tema central en la poesía posmodernista de Enrique Banchs, Evaristo Carriego y Baldormero Fernández Moreno, quienes realizan la incorporación del mundo suburbano a la poesía argentina. A continuación se centra en una original hipótesis que ahonda en la razón afectiva que pudo mover al escritor políglota, erudito y cosmopolita a sentir esa fascinación por el mundo del arrabal y del tango porteño.

Gómez-Martínez, José Luis. Más allá de la posmodernidad. El discurso antrópico y su praxis en la cultura iberoamericana. Colección Mileto-Ensayo. Madrid, Mileto Ediciones, 1999, 223 p.

Fil: Acosta, Emiliano.

La obra completa para piano de Luis Gianneo

Fil: De Marinis, Dora. Universidad Nacional de Cuyo. Facultad de Artes y Diseño

Gómez Martínez, José Luis. Pensamiento de la liberación: proyección de Ortega en Iberoamérica. Madrid, Ege, 1995, 232 p.

Fil: Ramaglia, Dante.

Actor Luis Politti

Este video es un homenaje al mendocino Luis Politti, quien fue una destacada figura del teatro, el cine y la televisión. Su talento como actor es recordado por colegas y amigos mendocinos quienes comentan su historia de vida. Luis Politti se convirtió en una de las primeras figuras de la naciente televisión mendocina y en uno de los actores más importantes del teatro provincial. Sin embargo, y en busca de nuevos horizontes, se radicó en Buenos Aires y en poco tiempo se convirtió en una de las figuras más importantes de la actividad artística nacional. Tras el proceso militar de 1976, Politti se exilia en México pero no es reconocido artísticamente y decide radicarse en España donde llegó a ocupar un lugar importante en el cine, teatro y la televisión española.