3,718 research outputs found
A mathematical model of flavescence dorée epidemiology
No full textFlavescence dorée (FD) is a disease of grapevine transmitted by an insect vector, Scaphoideus titanus Ball.
At present, no prophylaxis exists, so mandatory control procedures (e.g. removal of infected plants, and
insecticidal sprays to avoid transmission) are in place in Italy and other European countries. We propose
a model of the epidemiology of FD by taking into account the different aspects involved into the transmis-
sion process (acquisition of the disease, latency and expression of symptoms, recovery rate, removal and
replacement of infected plants, insecticidal treatments, and the effect of hotbeds). The model was con-
structed as a system of first order nonlinear ODEs in four compartment variables. A bifurcation analysis
shows that, in the absence of hotbeds, the state of healthy vineyard is stable, if removal and replacement
of infected plants is implemented. In the presence of hotbeds, depending on the grapevine density, we
find either a single family of equilibria in which the health of the vineyard gradually deteriorates for pro-
gressively more severe hotbeds, or multiple equilibria that give rise to sudden transitions from a nearly
healthy vineyard to a highly deteriorated one when the severity of the hotbeds crosses a critical value.
These results show the long-term risks in planting new vineyards in environmental situations where
strong hotbeds of FD are present or may arise in the surroundings
Milano consolato nell' elettione a questo arciuescouado, e promotione alla sagra porpora dell' eminentissimo Federico Visconti : colla sua solennissima entrata seguita a' 11. genaro 1682 e fontioni antecedenti /
No full textFrontispiece coat of arms of Milan, engraved by Federico Agnelli.Signatures: pi⁴ A-G⁴ H⁴(-H4).Mode of access: Internet.Binding: limp vellum. Author & title written on spine
Acquisition and inoculation of FD phytoplasmas by adults of Scaphoideus titanus Ball: less time is required
No full textScaphoideus titanus Ball (Hemiptera: Cicadellidae) is the main vector of grapevine’s “Flavescence dorée” (FDP) phytoplasmas (16SrV, subgroups C and D). According to the state-of-art, nymphs acquire phytoplasmas from infected plants within a few days (acquisition access period, AAP), and undergo a latency period (LP) lasting 3-5 weeks. Afterwards the insects, meanwhile having mutate to adults, are able of infecting new plants following and inoculation access period (IAP) of a few days. However, some aspects of FDP epidemics suggest that adults may also acquire directly phytoplasmas and become infective within their lifespan. Therefore, transmission experiments have been carried out under lab conditions, using broad bean plants (Vicia faba L.) artificially infected with 16SrV-C phytoplasmas as a source of inoculum. Uninfected S. titanus adults were allowed to feed for 7 days (AAP) on infected plants. Afterwards, three inoculations on healthy broad beans were performed at 7 days intervals each (IAPs). At the end of each IAP, insects were moved on a new plant. Therefore, IAP 1, IAP 2 and IAP 3 lasted 7, 14 and 21 days from the end of AAP, respectively. Phytoplasma were identified in plants and insects by DNA extraction and PCR. Some insects were also dissected and fluorescent in situ hybridization was made to detect the presence of phytoplasmas in midguts and salivary glands. Infection in insects and plants ranged 46-68% and 16-23%, respectively. Neither showed significant differences among IAPs, whereas phytoplasma load was significantly higher in IAP3 for both plants and insects. Phytoplasmas were identified in both midgut and salivary glands. The whole transmission process has been therefore successful within just 14 days (AAP=7 + IAP=7). These new insights are consistent with severe FDP outbreaks at the end of the summer in grapevine growing areas, and may call for new pest management strategies against S. titanus
»It contained harbours that pleased me like sonnets«. Kleine Poetik der diegetischen Karte
No full textIn this article, Federico Italiano explores the relationship between literature and cartography. Beginning with Stevenson’s Treasure Island, the author frames the topic through a general theoretical lens on the spatial dimension of literary texts. He then focuses on a specific phenomenon of literary "carticity"—the diegetic presence of the map, that is, the map as an integral element of the narrative structure. Among others, Italiano examines the works of Houellebecq and Cormac McCarthy
First record of the non-native Osbornellus auronitens (Provancher, 1889) (Hemiptera, Cicadellidae, Deltocephalinae) in Italy
No full textGlobalisation and international trade, in particular, are the major drivers of introduction and the spread of non-native species. To date, more than 30 species of non-native Hemiptera Auchenorrhyncha have been accidentally introduced into Europe. Some species are invasive with important repercussions primarily for agricultural activities, while almost no information exists on their impacts within natural ecosystems. Therefore, early detection of non-native species and their subsequent monitoring are extremely important actions to undertake.The North American Osbornellus auronitens (Provancher, 1889), firstly recorded for the Palearctic and Europe in Switzerland in 2016, is recorded in Italy for the first time on the basis of 77 specimens collected between August 2015 and October 2022
Portrait of the Author in (Him/Her)self
No full textA fragment of a philosophical essay by Jean-Luc Nancy and Federico Ferrari titled Iconographie dell’auteur (Paris, 2005), published for the first time in Polish, that addresses the problem of a relationship between the image of the author and his/her work
Aneddoti e ricette a corte di Federico II nel XXI secolo : il buon cibo e il buon bere nel più antico Ateneo pubblico al mondo
No full text[Italiano]: Questo volume rappresenta la finalizzazione di una iniziativa nata, condivisa ed interamente realizzata all'interno del gruppo social dei "Prof in cucina e in Cantina", che ha inteso raccogliere ricette e descrizioni aneddotiche di singoli Autori, appartenenti ai ruoli del personale docente e tecnico-amministrativo-bibliotecario dell'Ateneo federiciano, il più antico Ateneo pubblico al mondo. Aneddoti e ricette forniscono spaccati di vita quotidiana e ricostruzioni di eventi che hanno accompagnato gli Autori nei diversi percorsi formativi, sociali e lavorativi, e che non escludono riferimenti al recente periodo emergenziale della pandemia COVID-19. Ad introdurre il Volume è un menù federiciano, con una proposta di 3 pietanze che attualizzano ricette ed abitubini alimentari dell'epoca, e che hanno come riferimento il Liber de coquina, edito a corte di Federico II. Gli 8 Capitoli del volume raggruppano ricette e aneddoti per categorie, e ciascuno di essi è poi preceduto da un breve inserto con ulteriori riferimenti storici all'alimentazione a Corte di Federico II. Così, atmosfere vecchie e nuove, accompagnate dal sentore di aromi e da suggestioni ispirate al vissuto di ciascun Autore, si fondono per offrire a Lettrici e Lettori frammenti di quotidianità vissuti oggi a corte di Federico II, nel XXI secolo./[English]: The Volume represents the endpoint of a recent initiative, which was conceived, shared and fully realized within the social group of the "Prof in Cucina e in Cantina". Here, the several Authors, represented by the teaching and the technical/administrative/librarian staff of the Federico II University in Naples, the oldest public University in the world, propose recipes and anecdotal descriptions of their educational, social and work-related paths, including some episodes from the recent COVID-19 pandemic. A menu inspired to Frederick II introduces the book, with 3 recipes inspired to the Liber de coquina, a cooking manual compiled at the Emperor's court. Each of the following 8 thematic chapters of the book is also anticipated by a brief insert reporting historical reconstructions of the alimentary habits at the court of Frederick II. Thus, old and new atmospheres, accompanied by the scent of aromas and suggestions inspired by the experience of each Author, come together to offer Readers fragments of everyday life at the court of Frederick II, in the 21st century
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