1,721,005 research outputs found
Hydrological constraints to macrobenthic fauna biodiversity in transitional waters ecosystems
No full textLagoons are habitat islands in the coastal landscapes characterised by heterogeneity among ecosystems, due to the different terrestrial-freshwater- marine interfaces, as well as by heterogeneity within an ecosystem, due to an intrinsic patchy spatial distribution of abiotic and biotic components. Here, we investigated the influence of nine hydrological forcing factors of the patchiness of a lagoon benthic macroinvertebrates, described through macroinvertebrate diversity. This study is based on the analysis of two databases built, respectively, upon (1) a literature survey (ITA-DB) carried out considering a 25-year period and (2) a series of sampling campaigns during 2004-2005 in ten Mediterranean and Black sea lagoons (CaD-DB). Both databases showed a patchy distribution of macroinvertebrate taxa among lagoons with most taxa found in one or two lagoons only. Average similarity in taxa composition among lagoons revealed to be low for both ITA-DB (10%) and CaD-DB (11%), showing that macroinvertebrate taxonomic diversity is strictly linked to large-scale phenomena. Regression trees models indicate that 60.0% (ITA-DB) and 42.3% (CaD-DB), respectively, of total deviance of the macroinvertebrates diversity are explained by physiographical and hydrological factors, being openness and tidal range the two most relevant components. Therefore, hydrological constraints in the connection between lagoon and marine ecosystems seem to have a relevant role in the organisation and maintenance of benthic macroinvertebrate fauna of coastal lagoons. In order to design strategies of biodiversity conservation in Mediterranean transitional waters one suggested direction is a coordinated, inter-country governance, rather than a purely local management. © 2010 Springer-Verlag
Cerebral sinuses thrombosis in patients with high platelet count possible association with young age.
No full textStruttura tassonomica e dimensionale delle guild di macroinvertebrati bentonici nelle Saline di Margherita di Savoia. Atti S.It.E.
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Essential thrombocythemia and pregnancy: a report of six normal pregnancies in five untreated patients
No full textTo report our experience with essential thrombocythemia complicating pregnancy.
METHODS:
Over a 5-year period, we studied 21 women of reproductive age affected by essential thrombocythemia. Diagnoses were based on previously published Polycythemia Vera Study Group criteria.
RESULTS:
Five of our 21 patients became pregnant (total six pregnancies). All pregnancies were carried to term, with uncomplicated deliveries of normally formed infants. No thrombotic or hemorrhagic complications were encountered.
CONCLUSION:
Normal pregnancy and delivery is readily possible in patients with essential thrombocythemia
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
Species-area relationships as a tool for the conservation of benthic invertebrates in Italian coastal lagoons
No full textNormal pregnancy and delivery in essential thrombocythemia even without interferon therapy
No full textVariations 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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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