1,721,036 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
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
The natural history of the hyperthyrotropinemia of children born prematurely
No full textObjective: Non-autoimmune hyperthyrotropinemia has been previously reported among children born prematurely. The aim of this study was to follow up their thyroid function, volume, and structure and to investigate the relationship with growth, IGF-I, lipid profile, and insulin sensitivity. Methods: Seventy-two children born prematurely (33.2 +/- 2.2 weeks), 26 appropriate (AGA) and 46 small for gestational age (SGA), were evaluated at the age of 7.6 +/- 2.3 yr (time 1) and at the age of 11.4 +/- 2.3 yr (time 2). We also measured TSH, free T-3 (fT(3)), free T-4 (fT(4)), thyroperoxidase antibodies (TPO-Ab), thyroglobulin antibodies (TG-Ab), thyroid ultrasound, auxological parameters, lipid profile, glucose, and insulin level. Results: In the AGA group TSH was similar in both times (2.7 +/- 1.0 vs 3.0 +/- 0.9 mU/l) and above the upper normal limit in 4 (15.4%) subjects at time 1 and in 6 (23.7%) subjects at time 2 (ns). In the SGA group, TSH was similar in both times (2.8 +/- 1.2 vs 2.5 +/- 1.0 mU/l) and above the upper normal limit in 11(23.9%) subjects at time 1 and 5 (10.8%) subjects at time 2 (ns). fT(4) and fT(3) were always normal and TPO- and TG-Ab absent. Thyroid volume increased progressively, but significantly only in the AGA group (p=0.0005). The thyroid structure was always normal and there was no influence on the growth and the biochemical profile. Conclusions: Some ex-premature babies show a mild and variable thyroid dysfunction, which does not seem to evolve toward an overt thyroid dysfunction
Frequency, clinical and laboratory features of thyroiditis in girls with Turner'syndrome.Acta Paediatr. 84,909-12,1995.
No full textEvaluation of cortical thickness and bone density by roentgen microdensitometry in growing males and females.
No full textEffects of 1,25-dihydroxyvitamin D3 and growth hormone therapy on serum osteocalcin levels in children with growth hormone deficiency
No full textIn order to investigate the influence on bone metabolism of growth hormone (GH), we evaluated the response to an acute load of 1,25(OH)2D3 (Rocaltrol) (1.5 micrograms/day for 4 days) in 16 growth hormone-deficient prepubertal children (11 boys and 5 girls, aged from 6.2 to 9.6 years) both before and after 1 month of human GH (hGH) therapy (0.1 IU/kg/day, 6 times per week). Before and after the 1,25(OH)2D3 load, serum IGF-I, osteocalcin, Ca, P, alkaline phosphatase (ALP) and urinary excretion of Ca and P were measured. The serum levels of osteocalcin rose significantly after the first 1,25(OH)2D3 load, without an increase in IGF-I values and with a slight non-significant increase in serum Ca and P. Almost superimposable increases of osteocalcin, Ca and P were observed after 1 month of hGH therapy, with a significant increase of IGF-I, but they did not rise further after the second 1,25(OH)2D3 load. On the basis of our results, 1,25(OH)2D3 seems to have a stimulatory action on osteoblastic activity even in the absence of normal levels of GH. However, there is no apparent additional stimulatory activity after administration of hGH. Osteocalcin level behaviour during our study might suggest that GH and 1,25(OH)2D3 have a common and easily saturable stimulatory pathway on osteoblastic function
Clinical and hormonal outcome after two years of triiodothyroacetic acid treatment in a child with thyroid hormone resistance
No full textWe report here a new family with thyroid hormone resistance (RTH), with phenotypic variability among subjects. Particular emphasis is given to the clinical and hormonal outcome after 2 years of triiodothyroacetic acid (TRIAC) treatment in an affected child with peripheral thyrotoxic features (pituitary RTH [PRTH]). The genetic defect was a substitution in position 1642 (C to A) within the exon 10 of thyroid hormone receptor beta1 (TRbeta1) gene, resulting in the codon change P453T. The mutant receptor had a significantly reduced triiodothyronine (T3) binding affinity. Within this family, the child and the mother suffered from hyperthyroidism and were clinically classified as PRTH, while the maternal grandmother was clinically euthyroid, indicating a generalized form of the disease (GRTH). Rapid normalization of heart rate was initially obtained by the association of the cardioselective beta-blocker atenolol with TRIAC. Nevertheless, long-term TRIAC therapy, through its lowering action of serum thyrotropin (TSH) and thyroid hormone levels, maintained a normal heart rate after atenolol discontinuation and normalized the neurological disturbances and the clinical signs in the child, without any apparent side effect. In fact, growth velocity remained unchanged and no alteration of several parameters of thyroid hormone action at the tissue level was observed, whereas soluble interleukin-2 receptor levels improved significantly, confirming the safety and efficacy of long-term TRIAC therapy for PRTH also during childhood. We thus recommend testing the efficacy of TRIAC therapy in all RTH patients presenting with clinical features of hyperthyroidism
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
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