1,721,134 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
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
IMPROVEMENT OF ESTRADIOL 17-BETA-D-GLUCURONIDE CHOLESTASIS BY INTRAVENOUS ADMINISTRATION OF DIMETHYLETHANOLAMINE IN THE RAT
No full textThe intravenous administration of dimethylethanolamine in the rat promotes a selective enrichment of liver membranes with polyunsaturated phosphatidylcholines. The effect of dimethylethanolamine pretreatment on cholestasis induced by estradiol 17-beta-D-glucuronide, a potent cholestatic agent, was assessed in this study. Dimethylethanolamine, dissolved in sodium-taurocholate was infused intravenously (0.3 mg/kg/min) for 15 hr. One group of control rats (estradiol 17-beta-D-glucuronide controls) received the bile salt only. An estradiol 17-beta-D-glucuronide bolus was then injected intravenously (10.4 mg/kg) into dimethylethanolamine-pretreated and estradiol 17-beta-D-control rats, and its effect on bile flow and biliary lipid secretion was compared for 3 hr. The estradiol 17-beta-D-glucuronide inhibitory effect on bile flow and biliary lipid secretion was significantly antagonized by dimethylethanolamine pretreatment. The maximum inhibition of bile flow was found 30 min after estradiol 17-beta-D-glucuronide administration, when it decreased from 3.5 +/- 0.4-mu-l/min/100 gm (basal) to 0.9 +/- 0.3-mu-l/min/100 gm in estradiol 17-beta-D-glucuronide controls, whereas in dimethylethanolamine-pretreated rats this decreased only from 3.2 +/- 0.4 (basal) to 2.3 +/- 0.4-mu-l/min/100 gm. Bile flow and the biliary secretion of cholesterol, phosphatidylcholine and bile salts were significantly higher in the dimethylethanolamine-pretreated rats than in estradiol 17-beta-D-glucuronide controls (p < 0.02) during the cholestatic phase. The inhibitory effect of estradiol 17-beta-D-glucuronide on bile flow was associated with a marked decrease of membrane fluidity (p < 0.001) assessed by 1,6-diphenyl-1,3,5-hexatriene fluorescence anisotropy and with a cholesterol enrichment of microsomes, sinusoidal and canalicular liver plasma membranes and inhibition of sinusoidal Na+, K+-ATPase activity (p < 0.05). These membrane alterations persisted 180 min after estradiol 17-beta-D-glucuronide administration despite complete normalization of bile flow. Dimethylethanolamine pretreatment significantly counteracted the reduction of membrane fludity (p < 0.001), the cholesterol enrichment and the inhibition of Na+, K+-ATPase (p < 0.05) promoted by estradiol 17-beta-D-glucuronide administration in all membrane subfractions 30 and 180 min after administration. In addition, dimethlethanolamine-pretreated rats had more poly-unsaturated fatty acids in membrane phosphatidylcholine with respect to the control groups. Dilatation of canaliculi and loss of microvilli were evident in estradiol 17-beta-D-glucuronide controls 180 min after estradiol 17-beta-D-glucuronide administration. Dimethylethanolamine pretreatment antagonized the toxic effect of estradiol 17-beta-D-glucuronide cholestasis, particularly in the canalicular zone, which had a normal structure both 30 and 180 min after estradiol 17-beta-D-glucuronide administration. In conclusion, the intravenous administration of dimethylethanolamine improves the biochemical, biophysical and ultra-structural features of estradiol 17-beta-D-glucuronide cholestasis in the rat
Liver transplantation in Italy: current status
No full textThe first liver transplant in Italy was performed in 1982. With the improvement in results, the number of patients followed, in recent years, has substantially increased in all centres. In parallel, the indications for liver transplantation have expanded and have raised the need for more organized structures where patients can be referred for evaluation and transplantation. Indications and contraindications to liver transplantation in Italy, the role of retransplantation, paediatric liver transplantation, waiting list management, liver transplantation outside Italy and the new Italian laws on organ donation are discussed. The multidisciplinary Study Group on Liver Transplantation of the Italian Association for the Study of the Liver (AISF) has collected information from all the Italian centres to ascertain the degree of consistency in their methods
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
Studio ultrastrutturale della colostasi sperimentale da estradiolo 17- Glucuronide nel ratto.
No full textkoamabayili/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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