1,720,968 research outputs found
Impact of the Mediterranean fruit fly (Medfly) Ceratitis capitata on different peach cultivars: The possible role of peach volatile compounds
No full textThe relationship between susceptibility of different peach cultivars (cvs) to the Mediterranean fruit fly (medfly), Ceratitis capitata, and the volatile composition of ripe fruit of each cv has been investigated, since understanding the fruit-insect interaction mechanism is crucial for developing control strategies for such a pest. Volatile compounds were analyzed by SPME-GC-MS in three cvs highly susceptible to medfly attack (Fair Time, Flaminia, Sicilia Piatta), and in two less susceptible cvs (Percoca Romagnola 7 and Doctor Davis). Among the volatile compounds detected, 88 could be identified. The main differences found in the volatile composition of the cvs, concerned the relative abundance of esters. The least susceptible cvs, above all Percoca Romagnola 7, contained the higher amounts of hexenyl, hexyl, 3-methylbutyl, butyl and 2-methylpropyl esters; among these, some C6 derivatives detected, such as (Z)-3-hexenyl acetate, are known to act as priming agents, enhancing plant defence response to insects. Instead, a lower relative content of methyl esters, such as methyl hexanoate and methyl octanoate, known to act as medfly pheromone and attractant respectively, was found in the least susceptible cvs. © 2013 Elsevier Ltd. All rights reserved
Palms (Phoenix canariensis) infested by red PALM weevil (Rhynchophorus ferrugineus Olivier): Insecticidal efficacy tests of chipping treatment
No full textThe provision n° A6505/29-11-2010 of the Lazio Region Agricultural Department states that the plant material resulting from the felling of palms infested by RPW (Rhynchophorus ferrugineus Olivier) must be disinfested by heat treatment or fine mechanical chipping, ensuring that the resulting materials obtained are of a size smaller than 2 cm. This paper describes changes made on one machine chipper FARMI mod. FOREST CH260 for use in the cutting of trees and palm leaves in accordance with the above mentioned provision. The analyzes carried out on the plant material shredded, according to methodology UNI CEN/TS 15149-1 - 2006, show that 94,78% of the fragments is smaller than 16 mm and a water content of 52.5%. In all fragments of the material shredded at least one of the three dimensions was less than 2 cm. A mix of chipped stipes and leaves of palm tree was tested at ENEA facilities to evaluate the ability of RPW larvae to feed and survive on this substrate. Ten plastic containers (130 liters) were filled up with 26 kg each of chipped matter and infested with larvae grouped by weight into 3 classes ranged from 0.35 g till 2 cm (3 containers for each class and 1 as control; 30 larvae for each container). Containers, covered with a metallic net, were kept in an isolated chamber, controlling temperature in order to maintain the substrate around 30°C. The substrate was inspected at 45 dd after infestation. No survival was recorded on the larvae, indicating that chipping technique could be a suitable method to destroy infested palm avoiding potential risks of re-infestation from the disposal sites. © 2013, Copyright G. Sperandio et al
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
Introgressione in cultivar di patata di fonti di resistenza a dorifora, Leptinotarsa decemlineata Say, e tignola, Phthorimaea operculella (Zeller), derivanti da germoplasma selvatico (Solanum pinnatisectum Dun., S. berthaultii Hawkes).
No full textMusmeci, S
No full textScheda sulla figura e l'opera dell'ingegnere Sergio Musmeci e su quattro suoi progetti i cui elaborati sono conservati nelle Collezioni di Architettura del MAXXI di Roma
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
Effetto dell'estratto di Asphodelus ramosus (L), specie mediterranea, sul controllo di patogeni ed insetti di interesse agrario
Full text linkL'Asfodelo è una pianta erbacea originaria del sud Europa, Africa, Medio Oriente e sub continente Indiano, ma esprime la sua maggiore diversità soprattutto nel bacino del Mediterraneo. Fin dall’antichità sono riconosciute le sue proprietà terapeutiche ed alimentari essendo ricca in flavonoidi, come luteolina, isovitexina, quercetina, e acidi fenolici (e.g. acido caffeico, gallico e clorogenico) acidi grassi e polisaccaridi (“inulina-type fruttoligosaccarides”). Il documento del Green Deal Europeo, ‘Farm to Fork’, ha posto l’obbiettivo, entro il 2030, di una riduzione del 50% dell'uso di sostanze chimiche fitosanitarie. In questo contesto l’uso dei fito-estratti naturali rappresenta una possibile alternativa all’uso dei composti chimici di sintesi da integrare ad altre soluzioni per una gestione sostenibile del sistema produttivo. A questo scopo si è voluto determinare l’effetto di estratti acquosi da radice di A. ramosus (L) a diverse concentrazioni sia sullo sviluppo in vitro di Botrytis cinerea, patogeno ubiquitario in grado di infettare molte specie vegetali, che sulla schiusa di uova, e sugli stadi giovanili della cimice asiatica, Halimorpha halys (Stål), specie invasiva polifaga su cui non sono ancora disponibili efficaci sistemi di controllo. I risultati ottenuti evidenziano un effetto inibitorio dell’estratto di asfodelo, in funzione della sua concentrazione ed un efficace effetto insetticida sulla cimice asiatica. L’estratto è stato analizzato anche per le sue caratteristiche fisico/chimiche.The Asphodelus genus, is an herbaceous plant originating in southern Europe, Africa, the Middle East and the Indian subcontinent, which exhibits a great genetic variability in the Mediterranean area. Its therapeutic properties have been recognised since the ancient times, as it is rich in flavonoids, such as luteolin, isovitexin, quercetin, and phenolic acids (e.g. caffeic, gallic and chlorogenic acids) fatty acids and polysaccharides ('inulin-type fructooligosaccharides'). The European Green Deal, in particular the 'Farm to Fork', established the objective of 50% reduction of pesticides use by 2030. In that context, the use of natural phytoextracts represents a possible alternative to the application of synthetic chemical compounds, coupled with other solutions for a sustainable crop management system. The aim of this study was to determine the effect of aqueous extracts of Asphodelus ramosus roots at different concentrations on both, in vitro development of Botrytis cinerea, a ubiquitous pathogen able to infect many crops, and on eggs and juvenile stages of the Asian bedbug, Halimorpha halys (Stål), an invasive polyphagous insect, for which no efficient control systems are yet available. The results obtained show an inhibitory effect of the A. ramosus extract, according to the concentrations, and a significant insecticidal effect on the Asian bedbug. The extract was also analysed for its physic/chemical characteristics
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