1,720,970 research outputs found
Introduzione di Closterocerus sp. in Sicilia per il controllo biologico di Ophelimus maskelli Ashmead (Hymenoptera, Eulophidae) galligeno esotico sugli eucalipti
No full textOphelimus maskelli Ashmead (Hymenoptera, Eulophidae), galligeno sugli eucalipti, è stato accidentalmente introdotto di recente in Italia ed in numerosi paesi del Mediterraneo, causando allarmanti infestazioni, che hanno determinato in taluni casi vistose defogliazioni sulle piante adulte e deperimento delle piantine in vivaio e nei giovani impianti. In considerazione della vastità del patrimonio boschivo siciliano potenzialmente a rischio (25.835 ha, il più esteso d’Italia), è stato avviato un programma di controllo biologico classico, in collaborazione con il Volcani Center (ARO) di Bet Dagan (Israele) e lo CSIRO di Canberra (Australia), mediante l’introduzione del suo parassitoide Closterocerus sp. (Hymenoptera, Eulophidae). La specie, telitoca ed endofaga, è stata sottoposta in laboratorio a prove di parassitizzazione su ospiti alternativi, che hanno sempre dato esito negativo, permettendo di escludere possibili effetti indesiderati sull’entomofauna autoctona. Il parassitoide è stato rilasciato in cinque diversi siti, di cui due in aree di alberatura cittadina alla periferia di Palermo, e tre in eucalipteti delle province di Palermo, Trapani e Caltanissetta. L’eulofide è stato ritrovato in 4 dei 5 siti di rilascio già circa venti giorni dopo il lancio in campo, ed entro i successivi due mesi aveva fatto registrare una parassitizzazione del 46,6% in uno di tali siti. A distanza di circa cinque mesi dalla data di rilascio, il parassitoide esotico è risultato presente in tutti e cinque i siti di rilascio ed in cinque siti limitrofi, distanti da ciascuno di essi 1-2 km, nei quali si era diffuso spontaneamente. Nei siti di rilascio suburbani la parassitizzazione ha raggiunto ovunque valori superiori al 95%, mentre nei siti costituiti da estesi impianti forestali, dove la dispersione del parassitoide è probabilmente maggiore, le percentuali di parassitizzazione sono comprese tra il 9,9 e l’88,6%. Inoltre, Closterocerus sp. si è ulteriormente diffuso, essendo stato rinvenuto sei mesi dopo l’introduzione a 5,6 km dal più vicino sito di rilascio suburbano. Il parassitoide ha quindi dimostrato una spiccata specificità e notevoli capacità di diffusione autonoma sul territorio
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Release and establishment of Closterocerus chamaeleon (Girault) in Sicily for Biological control of Ophelimus maskelli Ashmead (Hymenoptera, Eulophidae), exotic gall wasp on Eucalyptus trees
No full textIntroduzione ed acclimatamento di Closterocerus sp. in Sicilia per il controllo biologico di Ophelimus maskelli Ashmead (Hymenoptera, Eulophidae) galligeno esotico degli eucalipti.
No full textVariations on the Author
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
