1,721,062 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
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
Evaluation of retinal layer thickness in patients with bipolar disorder, their relatives, and healthy controls using optical coherence tomography
No full textBackground: Bipolar disorder (BD) is a chronic psychiatric condition characterised by mood episodes and associated structural changes in the central nervous system. Optical coherence tomography (OCT) offers a non-invasive method to assess retinal layer thickness, potentially serving as an endophenotypic biomarker for neurodegeneration. This study aimed to compare retinal thickness among BD patients, their first-degree relatives, and healthy controls to identify structural markers and assess their alignment with existing literature. Methods: Thirty-six BD patients, 30 first-degree relatives, and 38 healthy controls were recruited from Van Yüzüncü Yıl University. Comprehensive ophthalmologic examinations and retinal layer thickness measurements using Spectralis OCT were performed. Retinal layers were analysed at 1 mm, 3 mm, and 6 mm concentric circles per the ETDRS protocol. Peripapillary retinal nerve fibre layer (RNFL) thickness was evaluated across seven regions. Due to significant age differences among groups (p = 0.002), an ANCOVA analysis was used to control for the age effect. Results: Retinal analysis revealed a significant increase in the inferonasal (NI) nerve fibre layer thickness in BD patients and their first-degree relatives compared to healthy controls (p = 0.008). Optic nerve head analyses showed non-significant thinning in the temporal (T), inferotemporal (TI), and superotemporal (TS) nerve fibre layer thicknesses in BD patients and their relatives compared to healthy controls. The thicknesses of the macular retinal layers did not differ significantly among the groups (p > 0.05). Conclusions: The observed increase in NI optic nerve fibre layer thickness in BD patients and their first-degree relatives contrasts with the expected thinning reported in previous literature on neurodegeneration in psychiatric disorders. This finding underscores the complexity of structural changes in BD and raises the possibility of alternative pathophysiological mechanisms or methodological considerations influencing retinal measurements. Further research is needed to elucidate these phenomena and their implications for understanding BD
Assessment of serum catalase, reduced glutathione, and superoxide dismutase activities and malondialdehyde levels in keratoconus patients
No full textBackground: The aim of this study was to investigate the relationship between keratoconus disease and the antioxidant activities of catalase (CAT), reduced glutathione (GSH) and superoxide dismutase (SOD) and the level of the oxidative stress marker malondialdehyde (MDA) in serum
Comparative Analysis of Oxidative Stress Biomarkers in 50 Primary Open-Angle Glaucoma Patients
No full textBackground: Glaucoma, a leading cause of irreversible blindness, is associated with increased oxidative stress and impaired antioxidant defense mechanisms. This study compared serum levels of malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), and reduced glutathione (GSH) in 50 patients with primary open-angle glaucoma (POAG) and 52 healthy controls. Material/Methods: Fifty patients in the POAG group and 52 age- and sex-matched individuals in the control group were included in the study. SOD activity was evaluated using the optical density of the blue formazan dye formed at 560 nm due to the interaction of nitroblue tetrazolium with xanthine and superoxide radicals generated by xanthine oxidase. CAT activity in serum was assessed using hydrogen peroxide and phosphate buffer solution. Measurement of GSH levels was performed using a phosphate buffer and DTNB (Ellman’s reagent) solution. MDA levels were quantified by measuring the colored complex formed with thiobarbituric acid. All biomarkers were measured using spectrophotometric methods. Results: The results indicated significantly higher serum MDA levels (P<0.001) and CAT levels (P<0.001), along with lower SOD levels (P<0.001) and GSH levels (P<0.001) in patients with POAG compared to the controls. Conclusions: These findings suggest that POAG patients experience increased oxidative stress and have an insufficient antioxidant defense system. The imbalance in the oxidant-antioxidant equilibrium in POAG patients suggests a role of oxidative stress in pathogenesis of the disease. Evaluating serum levels of these biomarkers could be valuable for diagnosing and treating POAG
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