1,721,034 research outputs found
Problems in the assessment of human exposure to tetrachlorodibenzodioxin (TCDD): the marker chloracne
No full textAn epidemiological study, aiming to assess the extent of the exposure to tetrachlorodibenzodioxin (TCDD) of the population involved in the Seveso accident, needs an effective information system, able to answer the questions usually asked--such as: why? what? who? where? when? how long?--and therefore concerning the wide range of the expected events, from the early cases till the ones expected in the long term. The paper is concerned with evaluation of possible use of chloracne as indicator of human exposure to TCDD, taking into account from one hand chloracne itself (i.e. its latency period, sensitivity, specificity, predictive value of diagnosis, etc) and, from the other, the development of the observational process. Moreover, the paper points out the role of the dermatological findings as representative--more than and before the other clinical findings--of the exposure conditions in the polluted area. The group of subjects classified as "chloracne" by the end of the second screening (May, 1977) included 187 cases, 164 of which were children 0-14 yrs old by the 10th of July 1976; 34 out of 164 were diagnosed in September-December 1976, the other 130 were diagnosed within the screening program. The results of a survey concerning their exposure data, clinical and laboratory findings are detailed. Finally, some remarks are made related to the quality of data. The authors emphasize that the reliability of assessment of health status of the exposed population depends not only upon a comprehensive a posteriori analysis of the different sets of clinical findings, but also upon the degree of integration of the professional staffs involved at operational levels.(ABSTRACT TRUNCATED AT 250 WORDS
Metallothioneins production in Carassius auratus L. as a function of different environmental parameters.
No full textManifestazioni di detossificazione in Carassius auratus L. precedentemente esposto a sali di cadmio
No full textMetallothioneins production in Carassius auratus L. as a function of different environmental parameters.
No full textRuolo delle metallotionine nei processi di detossicazione da cadmio in Carassius auratus L.
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
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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