1,720,987 research outputs found
Mercury and tin distribution in Posidonia oceanica L. Delile leaves into the Taranto Gulf
No full textISSN 0392-661
Determination of total thallium in environmental solid samples by stripping chronopotentiometry
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
Platinum (II) complexes containing iminoethers: a trans platinum antitumour agent
No full textThe biological activity of cis and truns complexes of formula [PtCl,( HN=C(OMe)Me ) J
has been investigated. The iminoether ligands can have either E or Z configuration about the
C=N double bond, therefore EE, EZ and ZZ isomers are obtainable. Substitution of iminoether
with EE configuration for amine leads to unexpectedly high antitumour activity for
the complex with tram geometry which turns out to be more active than the cis congener in
the P388 leukaemia system. The same frans-EE complex shows an activity comparable to that
of cisplatin in reducing the primary tumour mass and lung metastases in mice bearing Lewis
lung carcinoma, thus representing a tram platinum complex active on both limphoproliferative
and solid metastasizing murine tumours. Also the cytotoxicity, the inhibition
of DNA synthesis and the mutagenic activity, which are greater for the cis- with respect to
the fruns-isomer in the amine complexes, are instead greater for the trans- than for the cisisomer
in the case of iminoether compounds. Binding to calf thymus DNA is slower for iminoether
complexes than it is for amine complexes, however after 24 h reaction time the level
of binding is similar for both types of complexes. Tram-EE, like trans-DDP, does not give
the DNA conformational alterations (terbium fluorescence) typical of antitumour-active cis-platinum compounds, but, under strictly analogous experimental conditions, shows a greatly
reduced DNA interstrand cross-linking ability (heat denaturation/renaturation assay) with respect
to either trans-DDP or cis-EE and cis-DDP. The data in hand point to a new tram
platinum antitumour complex with a mechanism of action different from that of cis-DDP and
classical analogues
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
I Mari di Taranto:. problematiche di impatto ambientale.
No full text(Eds A Moroni, E Aloj Totaro, A Anelli
Mitochondrial DNA level in gills of Mytilus galloprovincialis collected in different Taranto sea sites contaminated by TBT
No full text- …
