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Deep-sequencing analysis of an apricot tree with vein clearing symptoms reveals the presence of a novel betaflexivirus
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Miglioramento sanitario dell’uva da tavola in Puglia ed ipotesi di regolamentazione sanitaria. Frutticoltura LXVIII
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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
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
FIRST RECORD IN APULIA OF SCAPHOIDEUS TITANUS, THE VECTOR OF FLAVESCENCE DORÉE
No full textIn accordance with the mandatory control of Flavescence dorée (FD) in Italy, a monitoring programme for the pres- ence of the phytoplasma agent of this disease and its vector Scaphoideus titanus Ball. was initiated in Apulia (southern It- aly) since 2005. Surveys were carried out annually from June to October and, whenever observed, vines with yellows-like symptoms were tested by nested PCR. For vector catching, sticky traps were placed in a few vineyards and/or nurseries in each of the six Apulian provinces and replaced every two weeks, during the whole insect fly period (mid-June to late September). In 2013, 19 adults of a leafhopper with the morphological traits of S. titanus, as determined using the Douglas and Barnett (1976) key, were captured for the first time in Apulia, on traps exposed from mid August to mid September. The collected specimens were brought to the laboratory and 17 of them were tested individually by nested PCR for the presence of phytoplasmas. The insects were in- dividually ground in CTAB-based buffer (Marzachì et al., 1998), aliquots (2 μl) of the recovered total nucleic acid were subjected to nested PCR using two pairs of generic primers (P1⁄P7, R16F2n⁄R16R2) that amplify phytoplasma 16S rD- NA (Gundersen and Lee, 1996). No positive amplifications were obtained. The few vines with yellows-like symptoms present in some vineyards were PCR-positive but, after se- quencing of their amplicons, proved to be infected by Can- didatus Phytoplasma solani, the agent of Bois noir. Whereas Bois noir is known to occur in Apulia, though sporadically, S. titanus represents a new finding and a threatening one for the well-being of the local viticultural industry
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