1,721,011 research outputs found
Differences in SEM–AVS and TEL–PEL predictions of sediment impacts from metals in a coastal lagoon (Pialassa Baiona, NW Adriatic)
No full textBiological effects of chemical pollutants in the aquatic habitats largely depend by they bioavailability, which in turn reflects chemical bonds, organisms susceptibilities and environmental conditions that are very variable in transitional
waters. Sediments from a coastal lagoon (Pialassa Baiona, Italy) were examined
for potential metal impacts on aquatic biota by comparing sediment chemistry
data with two sediment quality guideline (SQG) values: the ratio of
simultaneously extractable metals to acid volatile sulfides (SEM-AVS), and
Threshold- and Probable Effects Level (TEL–PEL) values.
Sampling was designed in order to take into account of the natural land-sea
gradient, typical of the transitional water bodies, the anthropogenic disturbance
gradient, which in this case is geographically orthogonal to the natural gradient,
and the high spatial heterogeneity.
TEL–PELs predicted Zn rather than Cd, Cu, Pb, Ni is likely to cause adverse
effects in the area closed the anthropic disturbance, but not in other areas far from the disturbance and under the sea influence. The SEM/ AVS ratio was found to be < 1 at all areas located near and far the anthropic disturbance. The AVS–SEM method predicted that sediments would
have fewer effects due to high AVS-forming metal sulfide complexes, reducing trace metal bioavailability. These results indicated that adverse effects on aquatic
biota should rarely occur. These somewhat contradictory predictions demonstrate the importance of
validating the results of either of these methods with other biological measures before making any management or regulatory decisions of point and non point sources of pollution. This is especially important in transitional water bodies such as coastal lagoons where sediment quality guidelines have not been validated at European level
Malignant Melanoma Associated with Human Immunodeficiency Virus (HIV) Infection: a case report and review of the literature
No full textA case of malignant melanoma arising in a young patient suffering from human immunodeficiency virus (HIV) infection is reported, along with a review of the literature. The neoplasm was characterized by aggressive clinical behaviour and, histopathologically, by a peculiar retiform pattern of growth with neoplastic cells interspersed among collagen bundles in the dermis without evident fibroplastic stromal reaction. In addition, a complete absence of host inflammatory cell infiltrate was noted. We hypothesize that this unusual histopathological pattern of growth, which has never been reported in this clinical setting, might be associated to HIV disease, immunosuppression and poor clinical outcom
Thin cutaneous malignat melanomas (<1.5 mm): identification of risk factors indicative of progression
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
Correction: New paradigm for stage III melanoma: From surgery to adjuvant treatment (Journal of Translational Medicine (2019) 17 (266) DOI: 10.1186/s12967-019-2012-2)
No full textFollowing publication of the original article [1], the authors reported that one of the authors, Corrado Caracò, has been accidentally omitted from the author list. In this Correction the author has been added to the author list. The correction has been implemented in the original publication of this article as well and the 'Authors' contributions' section has been updated accordingly there
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
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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