1,721,007 research outputs found
Niche overlap and functional redundancy of fungal species that affect cellulose-based cultural heritage.
No full textField- and photo-emission properties of CVD-diamond with different microcrystalline structur
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Reverberi M, Punelli M, LA STARZA S., Scala V, Scarpari M, Uva P, Mentzen W, Dolezal A, Woloshuk C, Pinzari F, Fabbri A, Payne G, Fanelli C (2013). GENOTYPIC AND PHENOTYPIC VERSATILITY OF ASPERGILLUS FLAVUS DURING MAIZE EXPLOITATION
No full textAspergillus flavus is a cosmopolitan fungus able to respond to external stimuli and to
shift both its trophic behaviour and the production of secondary metabolites, including
that of the carcinogen aflatoxin (AF). To better investigate the versatility of this
fungus, we examined genetic and phenotypic responses within the fungus when
grown under four conditions that mimic different ecological niches ranging from
saprophytic to parasitic growth. Global transcription changes were observed in both
primary and secondary metabolism in response to these conditions, particularly in
secondary metabolism where transcription of nearly half of the predicted secondary
metabolite clusters changed in response to the trophic states of the fungus. The
greatest transcriptional change was found between saprophytic and parasitic growth,
particularly related to the secondary metabolite cluster 32. This cluster contains two
fungal effectors: the necrosis and ethylene-inducing peptide and a salicylate
hydroxylase. This cluster is apparently controlled by two ethylene responding
transcription factors. We inactivated one of these for checking change in A. flavus
virulence phenotype on maize. We also examined tolerance of A. flavus to oxidative
stress and found that growth and secondary metabolism were altered in a superoxide
dismutase (sod) mutant and an alkyl-hydroperoxide reductase (ahp) mutant of A.
flavus. Data presented in this study show a multifaceted response of A. flavus to its
environment and suggest that oxidative stress and secondary metabolism are
important in the ecology of this fungus, notably in its interaction with host plant and
in relation to changes in its lifestyle (i.e. saprobic to pathogenic
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
Atlante di indicatori della qualità del suolo- Scheda 6: foresta demaniale Ledera, S. Stefano Quisquina, Agrigento
No full textVariations 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
One-step incorporation of Pd-Zn catalytic sites into organized mesoporous alumina for use in the oxidative steam reforming of methanol
No full textIn this paper we report the preparation of an organized mesoporous Pd-Zn/alumina system, by a new surfactant-assisted single-step sol-gel synthesis, performed in alcohol, using stearic acid as a chemical template, aluminum sec-butoxide as Al source and metal stearates both as Pd-Zn sources and as structural directing agents. The prepared materials have been characterized using a variety of techniques such as thermogravimetric analysis, atomic absorption spectroscopy, X-ray powder diffraction and N2 adsorption-desorption, and preliminarily tested in the oxidative steam reforming of methanol (OSRM) in the temperature range 100-400 °C
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