186,393 research outputs found
Lichen e moss bags nel monitoraggio della qualità dell’aria: accumulo attivo o passivo di elementi in traccia?
No full text
Physiological 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
"Le passé ne s'arrête jamais" : Langue et pouvoir chez Jacques Poulin
No full textRapporto fra lingua e potere in Québec, attraverso la narrativa di Jacques Poulin.Le rapport entre langue et pouvoir à travers la réalité québécoise telle qu'elle apparaît dans la production romanesque de Jacques Poulin
Noir. La nuit dans le théâtre de Bernard-Marie Koltès
No full textStudio della presenza e delle funzioni della notte nella produzione teatrale di Koltès
Determinant factors of calcium oxalate minerals formation, weddellite and whewellite, on the surface of foliose lichens.
No full text
Obsession, hantise et folie dans Le Rouet des brumes de Georges Rodenbach
No full textAnalyse du thème de la folie et de la hantise dans "Le Rouet des brumes" de Rodenbach
- …
