1,720,994 research outputs found
Fitoplasmi della vite in Trentino: evoluzione, monitoraggi, analisi molecolari
No full textIn Trentino il contenimento delle malattie causate dai fitoplasmi della vite, nell’ottica di una
sostenibilità ambientale e in ottemperanza alle disposizioni di legge per quanto riguarda la
“lotta obbligatoria”, si basa su un importante lavoro di monitoraggio delle piante sintomatiche
e degli insetti vettori. Dal ritrovamento della Flavescenza dorata (FD) in provincia (2001)
l’utilizzo sistematico delle analisi molecolari tramite PCR sui nuovi casi di piante
sintomatiche ha avuto un ruolo fondamentale per seguire l’evoluzione e la diffusione delle due
fitoplasmosi (FD e LN) e per calibrare la gestione delle misure di contenimento sul territorio.
Degli oltre 4200 campioni fogliari (appartenenti a 50 varietà diverse) analizzati in 17 anni di
attività, Chardonnay risulta la cultivar più sensibile ai fitoplasmi (72% dei campioni), seguita
dal Pinot grigio (12%), mentre le varietà autoctone non risultano particolarmente suscettibili
(1,8% dei campioni). La diagnosi molecolare ha interessato negli ultimi anni anche insetti
adulti di Scaphoideus titanus catturati con frappage (373 campioni): la percentuale di
positività al fitoplasma della FD varia a seconda della pressione epidemica della malattia. Il
monitoraggio delle piante sintomatiche ha evidenziato una situazione stabile nel 2017 rispetto
a 2016 (0,17% d’incidenza media
Frequency of “flavescence dorée” detected in adults of Scaphoideus titanus collected in vineyards with different epidemic pressure of the disease
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Calosphaeria canker of sweet cherry in Trentino (north-eastern Italy)
No full textIn the recent years branch and trunk dieback of sweet cherry (Prunus avium L.) trees has been observed in Trentino (north-eastern Italy). Plants were stunted with wilted shoots and branches, internal canker and wood necrosis. The development of black perithecia was observed beneath the bark, in correspondence with the canker. Isolation from symptomatic branches was carried out by plating fragments of diseased wood tissues on culture media. Fungal colonies were transferred and identified with morphological and molecular methods, as well as with morphological observations of perithecia. Isolation from symptomatic branches consistently yielded pink-red colonies. Based on the observed characteristics of both perithecia and conidia, the fungus was identified as Calosphaeria pulchella (Pers.) J. Schrot. Identification was confirmed by BLAST analysis based on 100% ITS sequence similarity with GenBank references. The pathogenicity of C. pulchella isolates was evaluated by inoculating the trunk and shoots of two-year-old potted sweet cherry plants. Isolation from discoloured tissues was carried out. Twenty-one months after inoculation, some shoots started to show stunted growth and withering. C. pulchella was re-isolated from inoculated shoots and trunks
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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