1,720,961 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
A case–control study of risk factors associated with Zoon balanitis in men
No full textBackground Zoon balanitis (ZB) is a chronic inflammatory benign mucositis. Its etiopathogenesis still remains hypothetical and speculative. Objectives To determine risk factors associated with genital ZB in men. Methods This is a case-control study including 30 patients diagnosed with ZB and 54 patients with dermatological diseases other than ZB enrolled in the Dermatological Clinic of the University of Padova, Italy, from September 2015 to June 2018. Univariate and multivariate logistic regression analyses were used for analysis of data collected. Results According to multivariate logistic regression analysis, risk factors for ZB were as follows: the mean daily cigarettes consumption (OR 1.065; 95% CI 1.8-11.4; P = 0.006) and the number of weekly foreskin retractions (OR 0.847; 95% CI 5.5-24.1; P = 0.003). There were no statistically significant differences between cases and controls according to age, presence of circumcision as well in number of sexual partners. Conclusions To our knowledge, this is the first case-control study showing that smoking and poor genital hygiene are associated with being affected by ZB
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
Ligand-Selective Modulation of the Permeability Transition Pore by Arginine Modification. Opposing effects of p-hydroxyphenylglyoxal and phenylglyoxal
Full text linkChemical modification of mitochondria with the arginine-
specific reagents phenylglyoxal (PGO) and 2,3-butanedione
(BAD) decreases the Ca2 sensitivity of the permeability transition pore (PTP) and stabilizes it in the closed conformation (Eriksson, O., Fontaine, E., and Bernardi, P. (1998) J. Biol. Chem. 273, 12669–12674). Unexpectedly,
modification of mitochondria with the arginine-specific reagent p-hydroxyphenylglyoxal (OH-PGO) resulted instead in PTP opening. Sequential modification with OH-PGO and PGO (or BAD) revealed that the effects on the PTP depended on the order of the additions. PTP opening was observed when OH-PGO preceded, and PTP closing was observed when OH-PGO followed, the addition of PGO (or BAD). The differential effects of OH-PGO and PGO on the PTP open probability (i) were not modified by the conformation-specific ligands of the adenine nucleotide translocase bongkrekate
and atractylate; and (ii) were also observed in deenergized
mitochondria, indicating that the effect is exerted directly on the PTP. OH-PGO dramatically sensitized PTP opening, which was triggered by depolarization even in the presence of EGTA. These data show that arginine modification modulates the PTP conformation in a ligand-selective fashion and suggest that the effects of OH-PGO, PGO, and BAD are mediated by the same
arginine residues. We analyzed the structure of the arginine
adducts by matrix-assisted laser desorption ionization and time-of-flight mass spectrometry using a test peptide and N-acetylarginine. The results indicate that both OH-PGO and PGO react with arginine at a stoichiometry of 2:1 and form stable adducts that may be feasible to identify the PTP at the molecular level
Simulating the life course of psoriasis patients: the interplay between therapy intervention and marital status
No full textBackground: psoriasis, a chronic relapsing inflammatory disease affecting primarily the skin, shows multiple comorbidities including depression, cardiovascular diseases and other relevant conditions. Psoriasis patients experience social isolation, job loss, financial difficulties, and partnership problems. Inversely, psychosocial impairments may negatively influence the disease course.
Objective: To explore the feasibility of a model describing the interaction of psychosocial and clinical factors over the life course of patients.
Methods: we considered only seven states for members of a hypothetical population: single and healthy, single and having a psoriasis flare, single and “cured”, coupled and healthy, coupled and having a psoriasis flare, coupled and “cured”, and dead. Transition probabilities between states were taken from the Norwegian Population Register for the healthy population and from epidemiological research articles. Clinical experience allowed adjustments on the assumed parameters.
Results: Our macro-model, which simulates the effect of therapy intervention on patients’ partnership status, yields a description of the transitions between the seven states. Treatment efficacy shows only a negligible effect on the chances of living with a partner.
Conclusions: Mathematical modelling of interactions between social and health variables is in principle feasible. However complex models, comprising more variables (for instance: employment status, depression level, obesity etc.) are needed for more realistic simulations for the interactions studied. Since increasing the number of variables leads to an exponential increase of the model’s state space, switching to micro-modelling (representing each individual separately) may be necessary.
The final version of this research has been published in Journal of the European Academy of Dermatology and Venereology. © 2017 Wile
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
- …
