1,720,954 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Immunohistochemical evaluation of type IV collagenase (72-kd metalloproteinase) in prostatic intraepithelial neoplasia.
No full textThe aim of this study was to investigate the expression of type IV collagenase (72-kd metalloproteinase, MMP-2) in prostatic intraepithelial neoplasia (PIN) in relation to normal prostate (NP) and prostatic adenocarcinoma (PAc). Twenty formalin-fixed, paraffin-embedded prostatectomy specimens, in which NP, PIN and PAc were present, were immunohistochemically examined. The NP ducts and acini not contiguous with PIN and PAc showed slight MMP-2 immunostaining in the secretory cells, with some increase in intensity at the apical border, and moderate to strong immunoreactivity of some basal cells. In NP adjacent to PIN and PAc, rare ducts and acini showed strongly stained cells either isolated or in small groups of two, located within the thickness of the epithelium, close to the basement membrane. In the majority of PIN ducts and acini, the stratified secretory cells showed moderate staining. Most of these ducts and acini also showed strongly stained cells, which were mostly isolated, and either in contact with the basement membrane or scattered among the secretory cells. Low and high grade PIN showed some difference in the frequency of dark cells, which were more numerous in the latter. A small group of neoplastic acini adjacent to high grade PIN (early invasive adenocarcinoma) was observed in one of the 20 cases. Intense immunostaining was present in the acini originating from the PIN lesion. MMP-2 immunostaining of PAc was heterogeneous in intensity and location. Cribriform and solid/trabecular PAc showed weak cytoplasmic immunostaining; both moderately and intensely stained cells were seen in the cell layer adjacent to the stroma, intense immunostaining was shown by small clusters of neoplastic cells or single neoplastic cells located in the stroma. In acinar PAc, weak cytoplasmic immunostaining for MMP-2 was seen throughout most areas of the tumours, whereas moderately and intensely stained cells were observed less frequently than in cribriform and solid/trabecular adenocarcinoma. Intense immunostaining of single or small clusters of neoplastic cells located in the stroma was occasionally observed and, as with cribriform and solid/trabecular PAc, mainly located towards the periphery of the tumour nodules. Occasional ducts and acini with PIN and foci of PAc were either completely negative or very weakly stained. In conclusion, MMP-2 immunostaining increases progressively from NP, through PIN, up to invasive PAc. These results directly support the hypothesis that increased expression of metalloproteinases is a marker of malignant conversion
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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