1,721,011 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
Efficacy and renal tolerability of ibuprofen vs. indomethacin in preterm infants with patent ductus arteriosus
No full textIndomethacin is commonly used for the treatment of patent ductus arteriosus (PDA) but has renal failure as a main side-effect. Ibuprofen seems to be efficient in closing the ductus with less side-effects, but few studies are available in literature as regards its use in preterm infants. This study is a retrospective analysis of clinical data in order to compare the efficacy and the renal tolerability of ibuprofen and indomethacin administered to preterm infants with gestational age (GA) <= 30 weeks for the treatment of PDA. From our data, ibuprofen results pharmacologically as efficient as indomethacin and could be an alternative in prematures. About renal tolerability, our data confirm that non-steroidal anti-inflammatory drugs treatment could affect at least transiently renal function. Moreover, indomethacin could be more nephrotoxic compared with ibuprofen, as creatinine concentrations normalize more slowly in this group, although the mean difference between the two drugs was not significant as our population sample was small. Further studies are needed to assess whether ibuprofen is really less nephrotoxic than indomethacin, in particular by examining carefully the correlation between GA and ibuprofen administration
Efficacy and renal tolerability of ibuprofen vs. indomethacin in preterm infant with patent ductus arteriosus
No full textIndomethacin is commonly used for the treatment of patent ductus arteriosus (PDA)
but has renal failure as a main side-effect. Ibuprofen seems to be efficient in closing
the ductus with less side-effects, but few studies are available in literature as regards
its use in preterm infants. This study is a retrospective analysis of clinical data in
order to compare the efficacy and the renal tolerability of ibuprofen and indometh-
acin administered to preterm infants with gestational age (GA) £30 weeks for the
treatment of PDA. From our data, ibuprofen results pharmacologically as efficient as
indomethacin and could be an alternative in prematures. About renal tolerability,
our data confirm that non-steroidal anti-inflammatory drugs treatment could affect
at least transiently renal function. Moreover, indomethacin could be more nephro-
toxic compared with ibuprofen, as creatinine concentrations normalize more slowly
in this group, although the mean difference between the two drugs was not
significant as our population sample was small. Further studies are needed to assess
whether ibuprofen is really less nephrotoxic than indomethacin, in particular by
examining carefully the correlation between GA and ibuprofen administration
Paraneoplastic hypoglycemia in a diabetic dog with an insulin growth factor-2–producing mammary carcinoma.
Full text linkA 6-year-old intact female Labrador Retriever had diabetes mellitus, which had been difficult to control with insulin. The dog also had a solid ductal mammary carcinoma with very rapid growth, which was temporally related to onset of hypoglycemia. Eight months after initial diagnosis of diabetes, the dog had a hypoglycemic crisis. Insulin administration was stopped and serum glucose concentration returned to normal. Three months after discontinuing insulin, another hypoglycemic crisis occurred. During subsequent months, serum glucose concentrations remained at life-threatening levels (1.64–2.12 mmol/L, reference interval 4.44–6.66 mmol/L) simultaneously with an increase in the size of the mammary tumor, which reached a diameter of about 16 cm. At the time of surgery for removal of the tumor serum glucose concentration was 2.20 mmol/L and was then monitored every 3 hours after excision of the tumor. The glucose concentration continued to rise and reached 9.99 mmol/L 12 hours after the removal of the mammary tumor. Immunohistochemical staining demonstrated expression of insulin growth factor-2 by tumor cells, which apparently had caused the hypoglycemia during tumor growth even in a diabetic dog. Hyperglycemia associated with diabetes was pronounced after excision of the tumor and had been masked by the paraneoplastic effect of the tumor
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