L'elettrolisi: un'occasione per riflettere sulla Chimica, ma anche sulla storia, l'economia, l'ambiente

Pensiamo che partire da esempi tratti dal mondo che ci circonda, in cui le procedure della Chimica, sia teoriche che sperimentali, appaiano in tutto il loro intreccio con le attività umane, possa costituire un metodo efficace per fornire a vari livelli un’immagine della disciplina corretta. Ciò può aiutare ad approcciarsi ad essa senza paure e senza trionfalismi. Nell’articolo in particolare si tratteranno alcuni significativi processi di elettrolisi, evidenziando il loro sviluppo storico e le loro implicazioni dal punto di vista produttivo e del rapporto con uomo e ambiente.We believe that an effective way to provide, at various levels, a correct image of Chemistry could be based on examples from the world around us, in which the procedures of the discipline, both theoretical and experimental, appear in all their interweaving with human activities. This may help to approach it without fear and without triumphalism. In the article in particular we discuss some significant electrolysis processes, highlighting their his- torical development and their implications from the point of view of production and the rela- tionship with man and environment

La diagnostica per la conoscenza storica e artistica delle opere d'arte. Il ruolo delle analisi sui pigmenti nel restauro degli affreschi di Michelangelo nella Cappella Sistina

Il pensiero inerente la tutela delle opere d’arte ha subito una notevole evo- luzione nel corso della storia ed oggi è diventato indispensabile affiancare la scienza della conservazione alle consuete metodologie di restauro. Le scienze applicate ai Beni Culturali coinvolgono studiosi provenienti da diversi campi di ricerca e la collaborazione diventa una prerogativa imprescindibile per il successo dell’intervento conservativo e, soprattutto, per la conoscenza approfondita dell’opera in tutti i suoi aspetti, dai materiali costitutivi alla tecnica di realizzazione. Nell’articolo illustreremo quanto detto soffermandoci tra l’altro sul restauro degli affre- schi di Michelangelo della Cappella Sistina. Questo è stato definito come il primo restauro moderno, proprio perché le analisi hanno accompagnato ogni intervento tecnico sugli affre- schi, i quali sono tornati allo splendore originario nel rispetto dei principi teorici del restauro. In questo e in altri casi la diagnostica è diventata quindi un importante ausilio per lo stu- dio dei Beni Culturali, anche se la scelta della tecnica analitica deve essere relazionata sempre alla domanda alla quale si cerca la risposta. Le scienze applicate permettono di approfondire la storia dell’opera, la tecnica dell’artista, caratterizzano i materiali, ricostruendone le antiche rotte commerciali; tutte queste informazioni permettono di raggiungere una conoscenza senza pari, indispensabile per la valorizzazione, la tutela e la conservazione dei Beni Culturali.he approach to the protection of artwork has considerably evolved through- out history; placing side by side the conservation science and the usual methods of restoration has today become unavoidable. Science Applied to Cultural Heritage involves scholars from different research fields making their collaboration of paramount importance for the success of the conservation process and, above all, for the in-depth knowledge of the artwork in all its aspects, from the constituent materials to the realization technique. This article will discuss this topic taking into particular account the restoration of Michelangelo’s frescoes in the Sistine Chapel. This was defined as the first modern restoration, because scientific tests have accompanied for the first time any technical intervention on the frescoes, which were returned to their original splendor in respect of the theoretical principles of restoration. In this specific case and in other ones, the diagnostics has therefore become an important aid in Cultural Heritage studies, provided that the choice of the analytical technique is always related to the answer that one is trying to pursue. Applied sciences provide an insight into the history of the artworks, the artists’ techniques, the knowledge of employed materials – that allow one to reconstruct the ancient trade routes; all this information can accomplish an unsurpassed knowledge, which is becoming essential for the development, protection and conservation of Cultural Heritage

Le dimissioni del poeta. Una lettura di Baudelaire

La comunicazione analizza la posizione di Baudelaire rispetto al ruolo della poesia nella modernità attraverso la letttura di alcuni componimenti de "Les Fleurs du Mal"

Numb Isoforms Deregulation in Medulloblastoma and Role of p66 Isoform in Cancer and Neural Stem Cells

Numb is an intracellular protein with multiple functions. The two prevalent isoforms, Numb p66 and Numb p72, are regulators of differentiation and proliferation in neuronal development. Additionally, Numb functions as cell fate determinant of stem cells and cancer stem cells and its abnormal expression has been described in several types of cancer. Involvement of deregulated Numb expression has been described in the malignant childhood brain tumor medulloblastoma, while Numb isoforms in these tumors and in cancer stem-like cells derived from them, have not been studied to date. Here we show that medulloblastoma stem-like cells and cerebellar neuronal stem cells (NSCs) express Numb p66 where its expression tampers stemness features. Furthermore, medulloblastoma samples evaluated in this study express decreased levels of Numb p66 while overexpressed Numb p72 compared with normal tissues. Our results uncover different roles for the two major Numb isoforms examined in medulloblastoma and a critical role for Numb p66 in regulating stem-like cells and NSCs maintenance

IL NARRATORE TRA IMPEGNO E ART POUR L’ART. A PARTIRE DA BENJAMIN.

La relazione analizza aspetti del percorso intellettuale e critico di Benjamin nella prima metà degli anni trenta in riferimento al tema dell'impegno del narratore

Light, long-lived and secluded: can gluinos be driven out from LEP1 data ?

We briefly report about a possible settlement of the still ongoing dispute concerning the existence of SUSY signals in 4jet events at LEP1. We base our arguments on a simple selection strategy exploiting secondary vertex tagging and kinematical constraints, which could allow one to access or exclude gluino events for a broad range of masses and lifetimes.Comment: 10 pages, LaTeX, 3 PostScript figures embedded with epsfig. Complete ps paper and figures available also at ftp://ftae3.ugr.es/pub/rmt/ugrft70.p

Hepatitis B virus, hepatitis C virus and HIV coinfection among people living with HIV/AIDS in Buenos Aires, Argentina

The HIV epidemic in Argentina has changed since the first case was reported in 1982. Since the beginning of the 1990s, a decrease in the number parenterally acquired infections has been observed, with a marked increase in transmission through unprotected sexual contact (heterosexual and homosexual), and in the number of women living with HIV/AIDS.Fil: Laufer, Natalia Lorna. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Microbiologia. Area Virologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos "Juan A. Fernández"; ArgentinaFil: Quarleri, Jorge Fabian. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Microbiologia. Area Virologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bouzas, María B.. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas F. J. Muñiz; ArgentinaFil: Juncos, Gerardo. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas F. J. Muñiz; ArgentinaFil: Cabrini, Mercedes. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos "Juan A. Fernández"; ArgentinaFil: Moretti, Franco. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Microbiologia. Area Virologia; ArgentinaFil: Bolcic, Federico Martin. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Microbiologia. Area Virologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fernández Giuliano, Silvina. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas F. J. Muñiz; ArgentinaFil: Mammana, Lilia. Gobierno de la Ciudad de Buenos Aires. Hospital de Infecciosas F. J. Muñiz; ArgentinaFil: Salomon, Horacio Eduardo. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Microbiologia. Area Virologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cahn, Pedro. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos "juan A. Fernández"; Argentin

Dyspnea: when the preliminary imaging is unconvincing

A 73-year-old man was admitted to the Emergency Room (ER) for dyspnea and cough from several months. In ER were performed blood sampling, chest X-ray, electrocardiogram, echocardiogram and arterial blood gas. A thoracic ultrasound (US) revealed in the left side an abundant pleural effusion and a lung consolidation area of about 5 cm without air bronchogram. A thoracentesis showed the presence of hemorrhagic effusion. Chest computed tomography (CT) revealed micro-pulmonary embolism, abundant left pleural effusion with atelectasis of the lower ipsilateral lobe. Meanwhile the chest CT revised by the pulmonologist appeared suspicious for the presence of cancer, the cytological examination of pleural fluid revealed the presence of an adenocarcinoma. While the patient was waiting for the bronchoscopy he had a stroke and died in a few days. In conclusion, we believe that thoracic US has to be considered an extension of the physical examination, it is a bedside tool and it represents a valid diagnostic and therapeutic method. Therefore thoracic US, if closely linked to the physician's activity, can directly affect the decision-making process and management of the patient with dyspnea

Les études littéraires entre herméneutique et quantification

Quelle relation, entre l’histoire littéraire quantitative des vingt dernières années et la tradition de l’herméneutique interprétative ? En général, les réponses ont été de deux ordres : pour le camp interprétatif, les deux approches sont incompatibles et la quantification est presque dénuée de valeur ; pour les chercheurs quantitatifs, elles sont parfaitement compatibles et, en fait, complémentaires. Ici, je propose une troisième possibilité, qui émerge d’une comparaison entre les manières d..