1,720,977 research outputs found
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
Comparative evaluation of cytotoxicity and metabolism of four aldehydes in two hepatoma cell lines
No full textCytotoxic effects related to exposure to benzaldehyde, acetaldehyde, propionaldehyde and valeraldehyde in hepatoma cell line
Susceptibility of hepatoma cells to lipid peroxidation and adaptation of ALDH3C activityto iron-induced oxidative stress.
No full textInfluence of polyunsaturated fatty acid enrichment and CYP1A1 induction on lipid peroxidation in tumor cells
No full textWe thus applied
only one prooxidant stimulus after enriching two hepatoma
cell lines (MH1C1 and 7777) with lower concentrations
of arachidonic acid (ARA) than those used in
previous work, but still able to enhance lipid peroxidation
without loss of viability. After pretreatment with
ARA and exposure to the prooxidant, the cultured cells
were refed with normal growth medium and the effects
on the enzymes monitored. Moreover, since cytochrome
P450 is also able to influence lipid peroxidation during
its catalytic cicle [21], we pretreated the cells with the
inducer of cytochrome P450 b-naphthoflavone (BNF) or
with both ARA plus BNF, in order to see whether different
levels of lipid peroxidation might be achieved.
hepatoma cells can be said to adapt to oxidative stress when a single short oxidative stimulus is administered. This adaptation is achieved by decreasing the generation of reactive oxygen species
through the inhibition of xenobiotic bioactivatio
Comparative subcellular distribution of benzaldehyde and acetaldehyde dehydrogenase activities in two hepatoma cell lines and in normal hepatocytes.
No full textComparative subcellular distribution of benzaldehyde and acetaldehyde dehydrogenase activities in two hepatoma cell lines and in normal hepatocytes
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
- …
