1,720,968 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
Is phenylalanine (Phe) loading test still necessary for hyperphenylalaninemia patient with basal plasma level < 360 micromol/l?
No full textPhenylketonuria (PKU), is an autosomal recessive inborn error of metabolism, in most of cases (about 98%) due to phenylalanine hydroxylase (PAH) deficiency; the other (2%) of cases arise from disorders in tetrahydrobiopterin (BH4) synthesis or regeneration. BH4-responsive hyperphenylalaninaemia (HPA) is a recently described variant of PAH deficiency caused by specific mutations in the PAH gene. BH4 loading test or a combined Phe/BH4 loading test is included in the work-up of HPA. As defined by literature, patients with mild hyperphenylalaninemia (MHP) require a combined Phe/BH4 loading test, for which the possibility of plasma Phe's spontaneous elimination has to be considered. It has intact been reported that after a single 100 mg/kg Phe load (without BH4) in MHP patients plasma Phe levels return spontaneously to pre-load values within 24-48h. In Europe, BH4-loading test is mostly performed during neonatal period, because of high Phe levels and its practice to do it. This test is considered positive when initial plasma Phe concentrations decrease by at least 30% in the first 8 hrs and subsequently. It is known that serum Phe concentrations decrease after Bh4 administration in BH4 deficiency, but not in PAH deficiency. We report three cases of MHP patients diagnosed by neonatal screening. Their basal plasma Phe levels were 340.6, 330.1 and 328 micromol/l, respectively. Because their Phe levels were near to the cutoff (360 micromol/L) we then decided to do only BH4 loading dose (20 mg/kg at h 0 and h 24), without Phe loading test. All patients reported 53.7%, 67.1% and 34.7% plasma Phe levels decrease after 8h, respectively. Molecular analysis result was (first patient: IVS12+1g>a, A300S; second patient: R297H, P281L and the third: R261Q, P366H). No BH4 or DHPR deficiencies were reported; pterins levels were normal. As our patients were found to be BH4 responsive without performing Phe loading test and since their basal Phe levels were below the Phe cutoff 360 micromol/l), we can suggest that Phe loading test is not necessary for these kind of MHP patients. Our result needs more studies and number of cases to be further confirmed, but it can establish the importance of single BH4 loading test incorporation in the management of neonates screened for MHP
Could neurological symptomatology precede an acute metabolic crisis in patient affected by propionic aciduria (PA)? A particular case report
No full textPA is an inborn error of metabolism due to propionyl-coenzyme A carboxylase deficiency, often characterized by episodic metabolic decompensation at risk for neurologic sequelae. We report the case of a 13 years old girl, diagnosed after a severe metabolic decompensation episode at 7 days of age. From diagnosis, the patient follows a strict dietary and pharmacological treatment with optimal compliance, showing an isolated decompensation episode during illness at 1 year of age. At 12 years old, in wellness, she started to present progressive (about 2 weeks) generalized asthenia with marked hyposthenia at legs and intermittent eyelid ptosis. For the worsening progress of symptoms (psychomotor agitation and an episode of vomiting) she was admitted to hospital: Astrup, ammonia, lactic acid, complete blood count, hepatic and renal function tests and urine parameters were completely normal. After 6 hours she started to present excessive sweating, superficial breath and 2 vomiting, leading to severe metabolic acidosis with lactic and ketotic component, marked hyperglycaemia and ketonuria, requiring admission to intensive care unit. Our case report underline the importance to consider any neurological and neuropsychological symptoms and signs, even if not yet associated to metabolic blood and urine alterations, as prelude of a possible acute metabolic decompensation
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
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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