1,720,958 research outputs found
Cercosporiosis of olive in Apulia and attempts to control the disease
No full textSevere defoliation of olive trees due to the fungus Mycocentrospora cladosporioides (Sacc.) P. Costa ex Deighton, the causal agent of cercosporiosis, has been observed in Apulia (southern Italy) during the last three years. Although old mature leaves are primarily affected by the fungus, attacks to younger, 4- to 5-month-old leaves, have also been found. Trials aimed at evaluating the effectiveness of different control schedules by using copper oxychloride are in progress. Preliminary results indicate that in cv Leccino four treatments (February, April, end of August and late September) are required to effectively reduce the disease. Cercosporiosis attacks on olive drupes (cvs Coratina, Leccino, and Frantoio) in young and intensive groves were also recorded. Disease symptoms on the fruits varied according to the cultivar and ripening stage
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
Approccio innovative non distruttivo per la valutazione del danno da nematodi galligeni.
No full textI nematodi fitoparassiti rappresentano una minaccia significativa per le colture determinando ingenti perdite
produttive ed economiche. In questo studio è stato valutato una metodologia non distruttiva basata sulla correlazione
fra
danno
nematico
e
andamento
degli
scambi
gassosi
in
funzione
della
conducibilità
e
della
morfometria
stomatica.
La
ricerca
sperimentale
è
stata
condotta
su
piante
di
pomodoro
infette
da
Meloidogyne
spp.
sottoposte
a
differenti trattamenti fitosanitari e cresciuti sia in condizione controllata che in pieno campo. Il
monitoraggio diretto e non invasivo dello sviluppo radicale delle piante di pomodoro infette è stato valutato
mediante l’impiego di rhizotron collocati in serra. Oltre all’osservazione morfologica dell’apparato radicale e
dei sintomi ipogei, è stata determinata la risposta fisiologica delle piante sia attraverso l’analisi del metabolismo
primario che l’analisi microscopica dell’apertura stomatica. L’andamento dei suddetti marker di stress biotico
è stato analizzato a 45, 60, 90 giorni dal trapianto. I dati preliminari mostrano una correlazione tra densità
nematica e chiusura stomatica, con una risposta variabile in funzione del trattamento applicato e delle condizioni
ambientali.
I
risultati
evidenziano
il
potenziale
utilizzo
di
parametri
legati
al
metabolismo
primario
come
strumenti
di
supporto
nella
valutazione
indiretta
dell’efficacia
dei
trattamenti
nematologici
durante
la
fase
vegetativa
- …
