1,721,011 research outputs found
Lichen e moss bags nel monitoraggio della qualità dell’aria: accumulo attivo o passivo di elementi in traccia?
No full textDeterminant factors of calcium oxalate minerals formation, weddellite and whewellite, on the surface of foliose lichens.
No full textThe response of epiphytic lichens to air pollution and subsets of ecological predictors: a case study from the Italian Prealps
No full textPhysiological response of two varieties of the lichen Pseudevernia furfuracea to atmospheric pollution
No full textIn this work, we studied the physiological response of the two varieties of the lichen Pseudevernia furfuracea (L.) Zopf. exposed in coastal urban areas to a gradient of atmospheric pollutants. The two varieties were compared with respect to the photosynthetic apparatus functioning of the photobiont. Lichen chlorophyll a fluorescence was measured weekly for one month by means of Handy PEA fluorimeter. OJIP fluorescence transient and its derived parameters were evaluated as biomarkers of air pollution in the survey areas. This work supports the use of fluorescence parameters as a reliable tool for assessing the effects of pollutants. However, we highlighted that the responses of the two varieties to pollutants were different and modulated over time. We observed that the photosynthetic efficiency of the algal partner of var. ceratea showed a gradient from the unpolluted to the high-polluted site (unpolluted > low-polluted > high-polluted). Differently, var. furfuracea showed a deep decreasing of photosynthetic efficiency only in the high-polluted site. Our results evidenced that var. ceratea is more sensitive to a gradient of pollution, whereas the photobiont of var. furfuracea is less susceptible in an intermediate condition of pollution
Influence of isidia development on CO2 gas exchanges in the epiphytic lichen Pseudevernia furfuracea (L.) Zopf. var. furfuracea
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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
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