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Effetto della gestione della vegetazione sulla comunità microbica e sulle caratteristiche chimiche del suolo
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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
Soil microbial community as affected by heavy metal pollution in a mediterranean area of southern Italy
No full textThe relationship between pollution by heavy metals and soil microbial community was investigated in an area of Southern Italy mainly used for agriculture but also affected by industrial and extractive activities as well as vehicular traffic. Soil samples were seasonally collected in permanent crop fields (i.e. citrus and peach orchards, olive groves and vineyard) and uncultivated areas (coniferous and mixed forests, shrublands, grazing lands). Soil samples were analysed for chemical (water content, pH, cation exchange capacity, organic C, Cr, Cu, Zn, Pb and Cd contents) and biological properties (microbial biomass, fungal mycelium, soil respiration, potentially mineralizable nitrogen, metabolic quotient and carbon mineralization rate). The results showed that heavy metal contents in the studied soils generally fell within the limit values after Italian law, with the exception of soil from vineyard that generally exceeded the limit value for Cu, probably because of the large use of copper-containing fungicides. The soil Pb content was always above the values reported for typical unpolluted soils and sometimes the same was also observed for Cd and Cu. The data suggest that Cr, Cu and Zn mainly derive from agricultural activity, whereas Pb and Cd were mainly introduced by cement industry associated with extractive activity. The soil microbial community was negatively affected by increased Cr, Cu and Zn contents, but not by Pb and Cd. Among the heavy metals considered, Cr and Zn had the highest negative effect on soil microbial community. © by PSP
Functional diversity of microbial community in Mediterranean maquis soils as affected by fires.
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Functional diversity of soil microbial community as affected by chromium and copper pollution
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