2,129 research outputs found
Bonifiche benedettine alla Bagnarola. L’opera dei monaci di Santa Maria del Monte fra Cesena e Cesenatico
No full textBiomineralization and global change : A new perspective for understanding the end-Permian extinction
No full textWe investigated the kill mechanisms of the end-Permian mass extinction by analyzing patterns in biomineralization of marine invertebrates. The microstructures of Upper Permian brachiopod organocarbonate shells show the demise of the production of fabrics with a columnar layer-which has less organic matrix-in favor of more organic-rich shells at the end of Permian. Also, in the 100-120 k.y. interval prior to the Permian-Triassic boundary (PTB), the Rhynchonellata had small calcite structural units (fibers) and thus a higher shell organic content, whereas the Strophomenata were not able to produce smaller units. This suggests that the two classes had a different capacity to cope with environmental change, with the Rhynchonellata being more able to buffer against pH changes and surviving the PTB, whereas the Strophomenata became extinct. The observed trends in biomineralization are similar to the patterns in extant marine invertebrates exposed to increasing pCO2 and decreasing pH, indicating that ocean acidification could have been one of the kill mechanisms of the mass extinction at the PTB
Foreword - Proceedings of the 8th International Brachiopod Congress “Brachiopods in a changing planet: from the past to the future” (Milano, 10-14 September 2018)
No full textThe 8th International Brachiopod Congress took place in the prestigious venue of the Univer¬sity of Milano, Italy, in September 2018, after the previous edition held in Nanjing, China, in 2015. 150 participants from universities and re¬search institutes from all over the world attended the meeting, from Argentina, Armenia, Austria, Belgium, Canada, China, Czech Republic, Den¬mark, France, Germany, Hungary, Iran, Israel, It¬aly, Japan, New Zealand, Poland, Russia, Slovakia, Spain, Sweden, United Kingdom, and United States of America. Besides oral and poster scientific sessions, pico-presentations of young researchers, and two prestigious plenary lectures, the Congress was preceded and followed by three field trips (Spain, United Kingdom and Sicily), and by two mid-con¬gress day excursions at Castell’Arquato and Grigna Mountains. During the congress, all the topics and the re¬cent advances in the study of brachiopods, marine invertebrates that have dominated the Palaeozoic seas and had an important role in the Phaneorozo¬ic benthic communities, have been touched: from systematics and evolution to biostratigraphy, pala¬eoecology, palaeobiogeography, mass extinctions, and the biology of recent taxa. One of the novelties of this edition was a session dedicated to brachio¬pod shells as biomineral archives of fundamental importance to understand the evolution of marine calcifiers during climate and environmental changes in recent and deep time. So, also biomineralization and geochemistry were among the topics of the event. The high scientific level, activity and wide and interdisciplinary interests of the brachiopod re¬searchers’ community are testified by the numerous contributions received for the Proceedings of the 8th International Brachiopod Congress, 16 of which are published open access in issue 125/3 of Rivista Italiana di Paleontologia e Stratigrafia
Postal de Claudio Vivas a Maruja Vieira, junio 23 de 1955
No full textPostal de Claudio Vivas a Maruja Vieira, felicitándola por el reconocimiento que le fue otorgado a la autora de poemasPostcard from Claudio Vivas to Maruja Vieira, congratulating her for the recognition given to the author of poems.Publicación, fondo Maruja Vieira, carpeta 1, folio
The shell fabric of Palaeozoic brachiopods: patterns and trends
No full textunderstand the evolution and adaptations of marine calcifiers in time. Therefore, a
detailed study of the shell microstructure of Cambrian to Devonian brachiopods from
Iran is here presented. The shell of 38 brachiopod species, representatives of 22 families
and nine orders, has been analysed using scanning electron microscope (SEM), and a
database has been built, including macro‐ and micro‐morphological features used to
characterize the two‐ or three‐layered brachiopod shells. Two main microstructural
variants of the secondary layer have been analysed: fibrous and laminar fabrics. The
fibrous layer has a fabric comparable to that of recent brachiopods, whereas the laminar
fabric is more complex in its structural organization and has no recent analogue. In
cross‐section, the laminae are thinner than the fibres, and much less variable in size.
There is evidence that taxa with laminar microstructure have diverged from the
Billingsellida and then followed a trend implying a decrease in thickness of the laminae.
Our linear discriminant analysis (LDA) shows that shell fabric and shell thickness are
powerful predictors of shell shapes, which in turn approximate the brachiopod lifestyles
and ecological strategies. Taxa with a fibrous fabric are mostly biconvex, whereas
the groups with a laminar secondary layer are associated to a variety of shell shapes
and lifestyles. Even if the relations between shell fabric and shell thickness remain enigmatic,
as well as the metabolic cost they imply, shell fabrics, and the possible structural
and mechanical advantages conferred, could have played a role in the evolutionary success
of the Strophomenata during the Palaeozoic
“Dialogue between Translators and Authors. The Example of Claudio Magris”
No full textThe paper focuses on the forms of cooperation between authors and their translator(s) in all cases in which the two operate simultaneously. This issue is explored on the example of the Trieste-born author Claudio Magris, who cultivates a very close relationship with most of his translators.
Writing and translation have been coexisting in this author throughout his career and have resulted in the heightened sensitivity of Magris the author with regards to translation, as the first part of the analysis shows. The second part describes the dialogue between Magris and the translators of his works, and ends with the more general question of the significance and role of such a form of exchange
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