1,721,019 research outputs found
Impact of heat and moisture exchangers on ventilatory pattern and respiratory mechanics in spontaneously breathing patients.
No full text
Diagnostic tools for the identification of Brenneria nigrifluens, the causal agent of persian walnut bark canker
No full textAfter the first report in 1998 in North Italy (Veneto and Piemonte), bark canker of persian walnut (Juglans regia L.), caused by Brenneria nigrifluens, has later been described in other italian regions (Lazio and Campania). In 2002, we found the symptoms of the disease in walnut plantations for timber production located in 13 farms of Central Italy (Umbria and Marche). All of the 44 isolates obtained from diseased plants were Gram-negative and had oxidative and fermentative metabolism. Twenty of them were submitted to API 20E system (bioMérieux) for the identification because they were oxidase negative and therefore belonged to the Enterobacteriaceae. Four isolates (1 from Umbria and 3 from Marche) gave the 7-digit code0005773, which is identical to those observed for the type strain LMG 2694T and the two reference strains LMG 5107 and LMG 5953 of B. nigrifluens. When trunks of young walnut plants were inoculated with these 4 isolates, they caused typical symptoms of the disease 3 months after the inoculation. A number of isolates associated with bark cankers and not pathogenic on walnut plants were identified as Erwinia rhapontici by API 20E system. Rep-PCR performed with the primers REP showed that the pathogenic isoaltes had high similarity (89%) with the type and reference strains of B. nigrifluens. At present, we intend to develop a diagnostic molecular assay exploiting a 905 bp fragment amplified during REP-PCR, which seems to be characteristic of B. nigrifluens
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Dagli early birds alla «nottola di Minerva»: per costruire un’agenda di ricerca sull’air nelle Autorità indipendenti
No full text- …
