1,720,981 research outputs found
Recent channel adjustments and riparian vegetation: some examples from Molise (Italy)
No full textAn integrated geomorphological and ecological approach was adopted
to investigate the relation between recent channel adjustments and riparian
vegetation evolution by performing a large-scale multi-temporal
analysis of channel and land cover features and a study of the present-day
floristic setting along the three major river systems present in Molise
(Southern Italy), the Volturno, Biferno and Trigno. Our results highlight
the major channel adjustments that occurred between 1954 and 2009
consisting in progressive morphological changes, extreme channel narrowing
(between 84% and 97%) and moderate to very intense channel
incision (between 2 and 10.5 m). These channel adjustments led to the
progressive stabilization of most of the formerly active channel systems
and were accompanied by substantial changes in the riparian vegetation
which now appears largely, but not completely, in equilibrium with the
present river dynamics. Major differences may be noted between the
studied river reaches in relation to their state of naturalness, floristic richness
and differentiation in vegetation types, which appear particularly
controlled by the amount of channel incision and human disturbance.
Our findings underline the importance of fluvial dynamics and trends in
controlling the development and structure of riparian vegetation and the
connected ecological status of river system
Applicazione delle tecniche di morfometria geometrica nello studio della morfologia fogliare del genere Quercus L. subgen. Quercus (gr. Robur sensu Pignatti 1982)
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The proteome of Populus nigra woody root: response to bending
No full textThe first poplar woody taproot proteome map is reported here; a total of 207 proteins were identified. Spatial and temporal proteomic analysis revealed that factors involved in plant defence, metabolism, reaction wood formation and lateral root development were differentially expressed in the various sectors of bent vs. control roots, seemingly in relation to the distribution of mechanical forces along the stressed woody taproots. A complex interplay among different signal transduction pathways involving reactive oxygen species appears to modulate these responses
A proteomic approach to investigate the spatial and temporal response of Populus nigra to mechanical stress.
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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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