1,720,994 research outputs found
Relationship between non-radiative energy dissipation and xanthophyll cycle components in sun and shade leaves of Ligustrum ovalifolium exposed to chilling temperature
No full text
Xanthophyll cycle components and capacity for non-radiative energy dissipations in sun and shade leaves of Ligustrum ovalifolium exposed to conditions limiting photosynthesis
No full textEfficiency of photochemistry and non-radiative energy dissipation in leaves exposed to conditions limiting photosynthetic electron flow
No full textClimate-growth relationships of Quercus gussonei (Borzì) Brullo in the Mediterranean region: adaptive traits and water use efficiency.
No full textDue to their marginal distribution, peripheral tree populations are highly vulnerable and are more likely to be influenced by extreme climate conditions. This occurrence is known to cause dieback in many species at their Mediterranean margins. Quercus gussonei (Borzì) Brullo is a deciduous oak endemic of Sicily. It is a thermophilous, peripheral form of Quercus cerris L. which is showing an
incipient but ongoing decline. A deeper ecophysiological knowledge is urgently needed on this species in order to plan proper conservation actions and reduce the risk of its extinction. In the aim to understand at what extent changes in environmental conditions could be responsible for Q. gussonei decline, we carried out dendrochronological and water-use efficiency investigations.
Annual ring widths, earlywood and latewood analyses were accomplished in order to assess the climatic factors influencing the growth of Q. gussonei. In addition, we determined the carbon isotope discrimination (Δ 13C) in tree rings, allowing to evaluate WUE variations and the expression of possible plant adaptive traits. Climate-growth relationship were analyzed using response
functions.
Our findings highlight significant relationships between tree-rings width and climate data. The dendrochronological analysis of Q. gussonei showed a rather good adaptation of this species to the typical Mediterranean climate and oak trees seem to retain a certain resilience to efficiently face 14 less favorable environmental conditions. Furthermore Δ 13C indicates a long-term adjustment in water-use efficiency and the increase of WUE could be interpreted as a fair adaptation of this species to drought-prone environments
Variations of carbon isotope discrimination and leaf photosynthesis among populations of Castanea sativa Mill
No full text
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
Agro-biodiversità e tracciabilità in Olea europea. Sostenibilità e adattamento dell’agroalimentare al cambiamento climatico
No full textStable isotopes, as ecophysiological markers, can be used to assess the geographical origin of food and to analyze varietal behavior against environmental conditions. Several studies have been conducted to characterize Italian extra-virgin olive oils in terms of isotopic compositions. In this paper two case studies are shown: the first one concerns the variability in responses of different olive varieties to the environmental conditions of a common experimental site; the second case is an analysis of traceability of Italian extra-virgin olive oils over the national scale. In the first case study, relevant correlations have been found among fatty acids and isotopic compositions of C and O (!13C and !18O). In the second case study, the variability of isotopic compositions has been evaluated on a large number of Italian oil samples of known geographical origin, by combining stable isotopes mass spectrometry and spatial analysis techniques. All over the Italian territory, various isotopically homogeneous regions have been found, thus modelling a zonation of expected isotopic signatures. Such a zonation can be addressed to verify the declared geographical provenance of extra-virgin olive oils
- …
