1,721,032 research outputs found
Indagini sperimentali sul contenuto di oligoelementi dei funghi del bolognese e di altra provenienza,
No full textBiocontrol ability of Trichoderma harzianum strain T22 against Fusarium wilt disease on water-stressed lettuce plants
No full textThe control ability of Trichoderma harzianum strain T22 against Fusarium wilt of lettuce caused by Fusarium oxysporum f.sp. lactucae strain 365.07 was studied through mesocosm assays under extreme soil water content available for plants (-0.5 and -0.03 MPa).T22 was applied to nursery substrate at seeding, and to mesocosm soil at transplant of seedlings artficially infected by the pathogen. T22 decreased disease severity in comparison to infected controls by 57 and 78% in dry and wet conditions, respectively. Plant biomass was increased by T22 under both moisture levels. T22 colony growth, spore germination and antagonism to the pathogen were investigated under different water potential ( -0.03, -0.1, -0.5, -1.0, -2.0, -7.0 and -14.0 MPa) on minimal agar medium. All these parameters were influenced by water potential. However, they were similar at the same MPa values tested in the mesocosm assays.Our results provide evidence that T. harzianum strain T22 could be effective to control wilt disease caused by F. oxysporum f.sp. lactucae strain 365.07 under extreme soil moisture regimes already present in Italy, and susceptible to become more frequent in the near future
Contenuto in mercurio totale ed inorganico in funghi coltivati, spontanei ed in alcuni alimenti
No full textPotential for biocontrol of Pleurotus ostreatus green mould disease by Aureobasidium pullulans De Bary (Arnaud)
Full text linkPleurotus ostreatus, commonly known as “oyster mushroom”, is an edible fungus economically important worldwide. The green mould, caused by Trichoderma pleuroti and T. pleuroticola, is a very important fungal disease, and it is commonly controlled by the use of fungicides. The yeast-like fungus Aureobasidium pullulans is a biocontrol agent naturally found throughout a wide range of habitats. The effect of A. pullulans L1 and L8 strains on P. ostreatus, T. pleuroti and T. pleuroticola was studied in in vitro assays. Both yeast strains resulted compatible with P. ostreatus growth, and effective in reducing the T. pleuroticola and T. pleuroti colony growth. The inhibitory effect of L1 and L8 was similar in the majority of the Trichoderma-A. pullulans combinations on agar plates. Both strains were more efficient than Trichoderma in substrate colonization, and produced volatile and nonvolatile metabolites which reduced Trichoderma growth. When the activity of L1 and L8 was tested against the green mould disease of P. ostreatus under controlled conditions similar to those of a mushroom farm, only L8 was effective in controlling the disease. It showed an effect similar to that of the fungicide prochloraz against T. pleuroticola, the less aggressive pathogen, and lower than that of the fungicide against T. pleuroti, the most aggressive. The antagonism was the result of mechanisms like antibiosis and competition for space and nutrients, whereas the direct attachment of A. pullulans with hyphae of the pathogens did not play a role
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
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