3,316 research outputs found
L'assassino del duca. Esilio e morte di Lorenzino de' Medici
No full textLa figura di Lorenzino de’ Medici (1514-1548) – assassino del primo duca di Firenze Alessandro de’ Medici – è stata per secoli prigioniera di una storiografia divisa tra due letture diametralmente opposte: quella del volgare criminale e quella dell’eroico tirannicida. Forte di un’approfondita ricerca d’archivio – svolta nel corso di una fellowship quadriennale del Medici Archive Project presso l’Archivio di Stato di Firenze – il volume ricostruisce le vicende dell’assassino del duca nell’arco di tempo compreso tra la morte di Alessandro (1537) e quella dello stesso Lorenzino (1548), facendo ordine per quanto possibile tra realtà e leggenda. Se ne ricava un ritratto molto lontano dagli stereotipi della storiografia del passato, dal quale emergono, tra le altre cose, il ruolo politico di primo piano rivestito dal Medici nell’ambito delle manovre dei fuoriusciti fiorentini e importanti novità sulla redazione della sua Apologia e sulla morte del duca. Inoltre viene fatta luce sul complesso intrigo internazionale che portò all’omicidio di cui Lorenzino stesso rimase vittima, capovolgendone completamente l’interpretazione tradizionale. Completa il volume una ricca appendice di documenti, che comprende anche molte lettere inedite del Medici
L'architettura della Cattedrale di Napoli nell'Altomedioevo: lo sguardo verso Roma del vescovo-duca Stefano II (766-794)
No full textNella comunicazione si prende in esame la Cronaca dei vescovi di Napoli, compilata nell'VIII secolo. Dalle informazioni che il cronista dà del vescovo-duca Stefano II si deducono importanti conclusioni dal punto di vista storico-artistico
Transglutaminases from plant sources
No full textThis chapter presents the specific characteristics of transglutaminases (TGases) in different plant species by comparing them with those of the best-known TGases of animal origin. It, therefore, explains the involvement of TGases in specific aspects of the physiology of plant organisms, highlighting, above all at the cellular level, similar roles, and differences concerning those performed by animal TGases. The features of the putative gene sequences encoding for plant TGases are illustrated with special emphasis on the characteristics of the best-known mammalian TGase 2, among which the presence of the catalytic triad, the binding site for calcium and guanosine triphosphate (GTP), which are present in various plant organisms. The bioinformatics approach has enabled the comparison of the three-dimensional structures of plant TGases with their animal counterparts, suggesting that plant and animal TGases might exhibit a similar three-dimensional conformation from an energetic standpoint. Such similarity holds great significance for catalytic reactions
Pollen-Pistil Interaction
No full textThe aim of this Special Issue is to highlight the molecular dialogue between the pollen tube and the pistil [...
Who is the author of the 1876 Stefano manuscript?
No full textFor over one hundred years the Stefano manuscript was a private document in the possession of the Baccich family and descendants. It told a story of the 1875 Stefano shipwreck as narrated by the shipwreck survivor and the founding family patriarch Miho Baccich. In these circumstances the question of authorship of the manuscript was immaterial and did not arise as an issue. However, with the publication of the manuscript the author‟s name, or names, need to be formally attributed to it. It turns out that this is not such a clear-cut matter.
As we shall see, all informed sources attributed the authorship, and the ownership, of the manuscript to Miho Baccich. But the manuscript itself was written by Canon Stjepan Skurla – a priest from Miho‟s hometown of Dubrovnik. The question then arises: should Skurla also be considered as an author of the manuscript, or, even as the sole author (as some would have it)
S. Dall’Aglio, L’assassino del duca. Esilio e morte di Lorenzino de’ Medici, Firenze, Olschki, 2011
No full textLa recensione si focalizza sul libro di Stefano Dall'Aglio. L'autore ricostruisce gli anni dell'esilio di Lorenzino de' Medici (1537-1548), responsabile del tirannicidio del duca di Firenze Alessandro de' Medici. Da un lato, Dall'Aglio evidenzia come Lorenzino in questa parte della sua vita sia un tramite importante tra la corte francese ed i "fuoriusciti" fiorentini, che si oppongono a Cosimo de' Medici, nuovo duca di Firenze. Dall'altro lato, l'autore mostra che l'assassinio di Lorenzino, ucciso nel 1548, era stato ordinato dall'imperatore Carlo V.This review is focused on the book of Stefano Dall'Aglio. The author reconstructs the years of exile of Lorenzino de' Medici (1537-1548), who was responsible of the tyrannicide of the Duke of Florence Alexander de' Medici. On the one hand, Dall'Aglio highlights how Lorenzino in this part of his life is an important link between the French court and the Florentine "fuoriusciti", opponents of the new duke of Florence Cosimo de' Medici. On the other, the author shows that the murder of Lorenzino, who is killed in 1548, had been ordered by the emperor Charles V
Pollen-Pistil Interaction
No full textThe aim of this Special Issue is to highlight the molecular dialogue between the pollen
tube and the pistil. This is achieved with original articles and reviews which show how this
dialogue is controlled at the genomic and molecular levels. During the angiosperm’s double
fertilization, the pollen tube must enter female tissues, bypass numerous physical barriers
to reach the micropyle, and release gametes to complete the fertilization process with the
final fusion between male and female gametes. There are molecular signals produced by
the pistil that are intercepted by the receptors located primarily at the tip of the tube, which
generate effects that modulate its growth activity; in turn, the pollen tube releases molecules
that determine effects on the pistil cells. Thus, a complex dialogue develops between the
female and male counterparts, whose language is made up of an expansive molecular
alphabet that includes proteins, glycoproteins, arabinogalactan-proteins, lipid-binding
proteins, nanovesicles, ions, amino acids, sugars, hormones, reactive oxygen species (ROS), and modulators of gene expression
Regulation of Pollen Tube Growth by Transglutaminase
No full textIn pollen tubes, cytoskeleton proteins are involved in many aspects of pollen germination and growth, from the transport of sperm cells to the asymmetrical distribution of organelles to the deposition of cell wall material. These activities are based on the dynamics of the cytoskeleton. Changes to both actin filaments and microtubules are triggered by specific proteins, resulting in different organization levels suitable for the different functions of the cytoskeleton. Transglutaminases are enzymes ubiquitous in all plant organs and cell compartments. They catalyze the post-translational conjugation of polyamines to different protein targets, such as the cytoskeleton. Transglutaminases are suggested to have a general role in the interaction between pollen tubes and the extracellular matrix during fertilization and a specific role during the self-incompatibility response. In such processes, the activity of transglutaminases is enhanced, leading to the formation of cross-linked products (including aggregates of tubulin and actin). Consequently, transglutaminases are suggested to act as regulators of cytoskeleton dynamics. The distribution of transglutaminases in pollen tubes is affected by both membrane dynamics and the cytoskeleton. Transglutaminases are also secreted in the extracellular matrix, where they may take part in the assembly and/or strengthening of the pollen tube cell wall
- …
