1,720,972 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
dentification of SIP1-modulated genes during the epithelial-to-mesenchymal transition and interactions with KLF factors in EMT control
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Contribution à l'étude des mécanismes transcriptionnels du facteur de transcription SIP1/ZEB2
No full textLors de la conversion métastatique des tumeurs épithéliales, certaines cellules tumorales
acquièrent la capacité d’envahir le tissu sous-jacent et de former des métastases à distance. De
nombreuses données de la littérature montrent que l’acquisition de ces propriétés est
accompagnée d’un phénomène de transdifférenciation appelé « transition épithéliomésenchymateuse
» (TEM), impliquant la perte de caractéristiques de cellules épithéliales au
profit de caractéristiques de cellules mésenchymateuses. Parmi les modifications moléculaires
caractéristiques de la TEM, on observe une diminution de l’expression de cadhérine E ainsi et
l’expression de novo de filaments de vimentine. L’expression accrue de différents facteurs de
transcription inducteurs de la TEM est aussi rapportée.
SIP1 est un des facteurs de transcription impliqués dans les phénomènes de TEM
tumorale. Il a été clairement montré que SIP1 réprime l’expression de la cadhérine E en liant
son promoteur. Le mécanisme de répression n’est pas précisément connu, mais il n’implique
pas le co-répresseur CtBP. Un modèle de répression suggère que SIP1 empêche l’accès de
facteurs activateurs aux promoteurs des gènes réprimés. Les données obtenues au cours de ce
travail nous permettent d’appuyer cette hypothèse et impliquent KLF4, un facteur de
transcription activateur liant le promoteur de la cadhérine E, dans ce modèle. Nos résultats
révèlent en effet une compétition entre SIP1 et KLF4 pour la liaison sur le promoteur de la
cadhérine E. Nous montrons aussi que les deux facteurs ont des effets opposés sur l’activité
du promoteur de la cadhérine E et que KLF4 n’active celui-ci que lorsque SIP1 ne peut s’y
lier. Enfin, nos données nous ont permis de localiser plus précisément la région du promoteur
de la cadhérine E liée par KLF4. Cette région chevauche un des sites liés par SIP1.
SIP1 est considéré comme répresseur de la transcription, mais les données s’accumulent
montrant l’induction rapide de gènes cibles de la TEM, dont la vimentine, suite à une
surexpression de SIP1. Nous avons entrepris de mieux comprendre l’activation de la
transcription par SIP1 en utilisant le promoteur de la vimentine comme modèle, et par une
approche globale à l’aide de la technique de ChIPSeq. Cette partie n’a malheureusement pas
atteint ses objectifs
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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