967 research outputs found
Osteo-odonto-keratoprosthesis: A human model of autotransplant
No full textWe evaluated the microscopical changes that occurred when bone and dental tissue were exposed to such a foreign environment as the ocular surface and anterior chamber in 17 osteo-odonto-keratoprostheses removed from the recipient's eye after 1 to 20 years. Histochemical methods were performed to demonstrate elastic and precursor fibers, while immunohistochemical procedures were used to study the distribution of collagen types I to VI. Islands of heterotopic, newly formed bone were observed in the dentin and the periodontal space, leading to focal dentoalveolar ankylosis. Remodelling and disappearance of the periodontal ligament was never diffuse
Follow-up Extension Up to 43 Years of Modified Osteo-Odonto-Keratoprosthesis
No full textThe osteo-odonto-keratoprosthesis is a biological corneal prosthesis (KPro), introduced by Strampelli in 1964. It uses an osteodental lamina as a biological haptic derived from an autologous
mono-radicular tooth. An acrylic optical cylinder at the center of the lamina replaces the cornea, and the resulting osteo-dentalacrylic lamina is preferably covered by autologous buccal mucosa
or, if not available, by skin. In 2005, Falcinelli et al2 proposed several advances to the original surgical technique, the so-called modified osteo-odonto-keratoprosthesis (MOOKP), reporting
favorable results in a large cohort of patients who underwent surgery between 1973 and 1999 and followed up to 25 years.2 This study aimed at extending the follow-up of the same cohort
of patients, providing further evidence about long-term anatomic and functional outcomes of the MOOKP technique
Billboards. Two projects by Maurizio Montagna
No full textArchitecture, city, device, time: all of these issues are taken into account by the Milanese photographer Maurizio Montagna. A keen interpretation of places in their anthropic and cultural transformation emerges from all his works. This article aims to focus on two different projects, Billboards 2008 and Billboards site-specific Latronico 2018, in which the author reflects on the relationship among the object, the subject and the context/landscape where they belong
The scientific achievements of Anna Maurizio
No full textOn the occasion of Anna Maurizio's retirement, O Morgenthaler (1966) gave a description of her professional career. After entering the Federal Station of Dairy and Bacteriology in Liebefeld-Bern in 1928, A Maurizio published her first papers on mycology of honeybees (1934-1935). Trained in botany, entomology and microscopic studies, she was plainly destined to take charge of honey pollen analysis and rapidly understood the advantages to be gained by a knowledge of pollen. She initiated the Bienenbotanik concept and wrote : "The concept of Bienenbotanik (bee botany) comprises the relations of the honeybees with their plant environment. To this field belong first of all bee plants (secretion of nectar, collection of nectar, production and collection of pollen), poisoning of honeybees by plants, microscopy of honey and pollen and also the relation of apiculture and agriculture. Connected with Bienenbotanik in a larger sense is also research about honeydew, use of pollen by the bee colony, physiology of the nutrition and poisoning by phytosanitary products" (Maurizio, 1960c). If pollination is disregarded, a field she hardly broached, at least one original contribution can be found for each of the great themes in the total of her publications. The pollen analysis of honeys was the initial theme. This field of research began with a publication by Pfister (1895), which was used by laboratories to verify the geographical origin of honeys; however, it remained entirely empirical. In 1935, Zander published a manual with a modern approach; the research of A Maurizio continued the work of Zander by completing it and giving it a new dimension with the introduction of the notion of typology. Typology of honeys. The theme of the typology of honeys has resulted in a long series of publications from 1936 until the present day. Honeys from a determined geographic or ecologic zone are described with the aim of determining the palynological essentials. The pollen spectrum of a certain honey forms the link between honeybee activity and the surroundings. This research led the author to start questioning all existing methodology of pollen analysis. Methodology. The first very important contribution (Maurizio, 1939) was a new approach to quantitative pollen analysis. The new method opened the door to the investigation of monofloral honeys which was to be continued for more than 20 years. The body of publications on this theme contribute considerably to the knowledge of melliferous flora, especially that in Europe. On the basis of this know-ledge, Méthodes de la Melissopalynologie (Louveaux et al, 1950) was edited within the framework of the activities of the International Commission of Bee Botany. Maurizio was the founder and the first president of this commission (Maurizio 1975b). Mellissopalynological observations. These consist of 19 short communications which were published between 1938 and 1963 (see annex). They deserve to be regrouped for their precise and efficacious approach to a mellissopalynological enigma. Poisoning of honeybees by plants. The bibliography on this subject is already extensive (Maurizio, 1945b). The personal research of A Maurizio concerns Ranunculus (crowsfoot), lime, and horse chestnut. Methods for maintaining worker bees in cages in the laboratory were developed during identification studies on toxic substances contained in the pollen. This research was the starting point for studies on the physiology of honeybee nutrition which began with the research on mellissopalynology. A number of publications followed, mainly as a result of the discovery of the connection between longevity of worker bees and nutrition (Maurizio, 1950-1954a). Collection of pollen. A Maurizio was able to study the returns with the aid of the "pollen trap". She was particularly interested in "mixed" pollen loads containing pollen grains from 2 or more different plant species. The percentage of these pollen loads varies and seems to be higher when the colony is in a difficult situation. Pesticides and poisonous gases. The diagnosis of honeybee poisoning by pesticides and gases emitted by the chemical industry became a major challenge for the Liebefeld laboratory : methods for calculating lethal doses were elaborated, and the problem of fluor emissions by aluminium factories was specifically studied. Chromatography. At the beginning of the 1950s paper chromatography of sugars was used in the laboratories which analyzed honey. A Maurizio introduced this method to complement pollen analysis. As a result of the new technique, considerable progress was made in the analysis of monofloral honeys. Due to the possibility of analyzing very small quantities, parallel studies of nectar became feasible. From the nectar to the bee and finally to the honey, sugar chromatography showed all the transformations of the original material; and honeydew was not forgotten. Nectar secretion. A Maurizio was very interested in polyploid plants : fodder plants or ornamental flowers visited by honeybees. Polyploidy causes changes in quantity and quality of the secreted nectar, but not in all cases with obvious advantage for honeybees. A Maurizio and plant physiology specialists were able to study the functioning of the nectaries, site of important enzymatic activities. In conclusion, it can be said that the scientific work of Anna Maurizio is a mine of information — both facts and methodology — which will provide knowledge for many years to come. Her contribution to changing pollen analysis of honeys from the empiricism of the beginning of the century to a modern scientific discipline, mellissopalynology, has also been a great value to apiology
La grammatologie comme science positive : Maurizio Ferraris lecteur de Derrida
No full textGramatology as a positive science: Maurizio Ferrari\u27s Derrida Reception
Maurizio Ferraris is developing a realist ontology that severely criticizes the main theses of postmodernity for philosophical, ethical, and political reasons. Paradoxically, however, Derrida plays an important role in his thinking. By distinguishing natural objects from ideal objects and, ultimately, from social objects, the author shows that, rather than a criticism of Derrida, Ferraris’ realist ontology aims to limit Derridean thought to the field of social objects, which are above all written and inscribed objects. Through arche-writing and the theory of the trace, Ferraris demonstrates that writing carries the social, because the trace exists only insofar as it is recognized and therefore in a relation. In this way, Derrida\u27s philosophy finds itself at the heart of a field from which we might have thought it had been excluded: contemporary realist ontology
Trabajo, vida y biopolítica en la obra de Maurizio Lazzarato
No full textThis writing seeks to examine the way in which Maurizio Lazzarato elaborates the
problem of labor and, with it, the notions of production and life between 1990 and 2006
in the light of the concept of biopolitics. To do this, first, I will analize the way in which,
taking up some problems exposed by italian autonomism, the author introduces the
need to rethink the notion of labor, elaborating, with Antonio Negri, the concept of
immaterial labor. Then, I will move forward towards the twists that the author makes
in the foucauldian concepts of life and biopolitics, incorporating contributions from
Gabriel Tarde, Gilles Deleuze and Félix Guattari, to account for contemporary modes of
production and extraction of value.El presente escrito busca examinar el modo en que Maurizio Lazzarato elabora el problema del trabajo y, con este, las nociones de producción y vida entre 1990 y 2006 a la luz del concepto de biopolítica. Para ello, en primera instancia, se analizará la manera en que, retomando algunos problemas expuestos por el operaísmo italiano, el autor introduce la necesidad de repensar la noción de trabajo elaborando, junto con Antonio Negri, el concepto de trabajo inmaterial. Luego, se avanzará hacia las torsiones que el autor realiza en los conceptos de vida y biopolítica foucaultianos, incorporando aportes de Gabriel Tarde, Gilles Deleuze y Félix Guattari, para dar cuenta de los modos de producción y extracción de valor contemporáneos
Experimental investigation of a physical basis of a new integrity assessment procedure for ductile cast iron
No full textLAUREA MAGISTRALENella presente ricerca è stato studiato un metodo innovativo per la valutazione dell'integrità strutturale, basato sull'approccio dell'equazione di Voce, di ghise duttili convenzionali GJS400. Tale metodo di analisi è stato sviluppato a partire dalla modellazione delle curve di flusso plastico attraverso l'equazione costitutiva di Voce e permette lo studio della deformazione plastica dei materiali. Altro obiettivo della ricerca è stato valutare l'affidabilità di questo metodo studiando l’evoluzione del danno che consiste nell'analisi della variazione del modulo di Young E durante la deformazione. Questo metodo potrebbe essere utilizzato per valutare l'integrità strutturale al procedere della deformazione poiché si assume che la riduzione di E con la deformazione sia proporzionale alla riduzione dell'area efficace resistente alla propagazione della cricca. L’ipotesi è che minore è l’integrità del materiale, maggiore è la riduzione del modulo di Young con la deformazione. Quindi, lo studio di E vs. deformazione è stato usato per supportare la bontà del approccio MAD nella valutazione dell’integrità strutturale del materiale.
Test meccanici, i.e. prove di trazione con velocità di deformazione di 10-4 s-1 impostate in modo da applicare una serie di carichi e scarichi in successione al procedere della deformazione plastica, sono stati usati su diversi campioni di ghisa duttile prodotti utilizzando una staffa Lynchburg con diametro di 25mm, staffe a Y con uno spessore di 25-50-75mm e con elevato spessore al fine di studiare la relazione tra l’incrudimento e le diverse velocità di raffreddamento, cioè con le diverse microstrutture risultanti.
In accordo all'analisi di Voce, in particolare definendo il MAD, si può affermare che il test di carico-scarico usato per valutare l'evoluzione di E vs. deformazione non ha influenzato il comportamento di incrudimento dei materiali analizzati. Secondo i risultati ottenuti, il MAD permette di identificare univocamente materiali che presentano diversa composizione chimica e prodotti seguendo percorsi di produzione differenti. Inoltre, questo metodo è stato in grado di identificare e valutare in modo univoco l'integrità dei materiali. D'altra parte, confrontando i risultati dell'analisi microstrutturale e quelli dell’approccio dell’evoluzione del danno, è emerso che quest'ultimo è un metodo inaffidabile per una valutazione dell'integrità strutturale. Quindi, lo studio di E vs. deformazione non può essere usato a supporto della bontà dell’approccio MAD nel valutare l’integrità dei materialiIn the present research an innovative structural integrity assessment method, based on Voce equation approach, was studied using conventional ductile cast irons GJS400. This method of analysis was developed starting from the modeling of the tensile plastic flow curves, through the constitutive equation of Voce and involves the study of the strain hardening behavior. A second focus of the present work was to evaluate the reliability of this method through investigating the evolution damage approach that consists of the analysis of the variation of Young modulus during straining. This method could be used to evaluate the original structural integrity of the materials, as the reduction of Young modulus with straining is expected to be proportional to the reduction of the effective resisting area to a crack propagation. The hypothesis was that the lower the original integrity of materials, the larger the Young modulus reduction during straining. So, the Young modulus vs. strain investigation was used to support the goodness of the MAD approach to assess the integrity of materials.
Mechanical tests, i.e. tensile tests with a strain rate of 10-4 s-1 set in such a way as to apply a series of subsequent loading and unloading as the plastic deformation proceeds, were applied to a different nodular cast iron samples produced through Lynchburg molds with a diameter of 25mm and Y-molds with a thickness of 25-50-75mm, and in heavy-section to study the strain hardening behavior relationship with a wide range of cooling rates and so different microstructures.
According to the Voce analysis carried out, particularly by defining the MAD, it was possible to assert that the loading-unloading test applied to evaluate the E evolution vs. strain had not affected the strain hardening behavior. According to the results, MAD allowed to unambiguously identify the materials with different chemical composition and production routes. Furthermore, this method was capable of univocally identify and assess the integrity of the materials. On the other hand, comparing the results of microstructural analysis with those of the evolution of damage approach, it appeared that the latter method is not reliable for an integrity assessment of the material. So, unfortunately, the E vs. strain investigation could not be used to support the goodness of the MAD approach to assess the integrity of material
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Prophets, resurgences, and the truth: in discussion with Maurizio Viroli’s Prophetic Times
No full textMaurizio Viroli’s Prophetic Times: Visions of Emancipation in the History of Italy (2023) is the latest in a long list of outstanding works on Italian intellectual history that the scholar has published in the course of his career. Many of these works address one of the key issues posed by Machiavelli, an author to whom Viroli has dedicated the greater part of his intellectual endeavours: Italy “seems born to resuscitate dead things
Correction to: Thinking embodiment with genetics: epigenetics and postgenomic biology in embodied cognition and enactivism (Synthese, (2020), 10.1007/s11229-020-02748-3)
No full textThe article Thinking embodiment with genetics: epigenetics and postgenomic biology in embodied cognition and enactivism, written by Maurizio Meloni and Jack Reynolds, was originally published electronically on the publisher’s internet portal on 18 June 2020 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 6 November 2020 to ©The Author(s) 2020 and the article is forthwith distributed under a Creative Commons Attribution
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