1,721,016 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
Acute kidney injury and chronic kidney disease in donation after circulatory death liver transplantation: UK single centre study
No full textAim of the study is to assess the incidence of acute kidney injury (AKI) and chronic kidney disease (CKD) after liver transplantation (LT) in DCD vs. DBD recipients. Methods: this is a retrospective single-centre study of 1151 patients who underwent LT from 2007 to 2014. Exclusion criteria: urgent (=66) and living donor (=7) LT. We considered: renal function pre-LT, daily within one week post-operatively, at 1, 3, 4, 6, 9 months and 1, 3, 5 years post-LT, characteristics of recipient, donor type, graft variables and indicators of initial graft function. AKI and CKD defined and classified on the basis of KDIGO Guidelines (2012).
Results: we considered 1078 LT patients (830 DBD and 248 DCD). DBD recipients had a higher MELD (p=0.002) and pre-LT serum bilirubin level (p<0.001) than DCD but there were no differences in INR and serum creatinine values. DBD recipients had longer cold and recipient warm ischemia times than DCD (p<0.001 and p=0.018 respectively). The incidence of AKI was 57.9% (624/1078), of which 57.1% of DBD (474/830) vs. 60.5% of DCD (150/248). DCD recipients had a higher incidence of stage 3 AKI than DBD (20.6% vs. 12.7%, p=0.0197). Among patients with stage
3 AKI DCD had a higher cumulative incidence of CKD compared to DBD (SHR 1.6 (1.0-2.7), p=0.051).
Conclusion: For the first time we showed that both DBD and DCD recipients suffer a similar degree of stage 1-2 of AKI, but the DCD experience more severe stage 3 AKI, which is associated with a higher incidence of CKD in the long-term follow-up
The current state of liver and pancreas transplantation
No full textThe last 20 years have seen progressive developments in the field of clinical transplantation and in many countries kidney transplantation is now the most cost effective manner of treating renal failure. With increasing technical experience failures have become less common and newer immunosuppressive protocols incorporating cyclosporin A can frequently achieve a graft success rate of over 75% at one year with patient survival over 95%. In addition, the patient receiving a kidney graft attains a high quality of rehabilitation. If renal transplantation has now gained wide acceptance other forms of organ transplantation are still in a phase of development and have not yet reached wide acceptance. It is the purpose of this review to present briefly the current clinical status of two forms of solid organ transplantation being employed in clinical practice
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
Acute kidney injury in donation after circulatory death liver transplantation: UK single centre study
No full textaim: to assess the incidence and classification of acute kidney injury (AKI) after liver transplantation (LT).
methods: this is a retrospective single-centre study of 1151 patients who underwent LT at the university hospital Birmingham from 2007 to 2014. Exclusion criteria included: urgent (=66) and living donor (=7) transplantation. we considered: renal function pre-transplant and daily within one week post-transplant, characteristics of recipient, donor type (DCD vs.DBD), graft variables and indicators of initial graft function. AKI was defined and classified on the basis of KDIGO Guidelines (2012).
results: we considered 1078 LT patients (830 DBD and 248 DCD). DBD recipients had a significantly higher median MELD score (16.84 vs. 15.83, p=0.002) and serum bilirubin level (3.16 vs. 2.37, p<0.001) than DCD, whereas there were no differences in INR and serum creatinine values. furthermore, DBD had significant longer cold and recipient warm ischemia times than DCD (p<0.001 and p=0.018 respectively).
the incidence of AKI was 57.9% (624/1078 patients), of which 57.1% of
DBD (474/830) vs. 60.5% of DCD (150/248). AKI classification is reported in the table.
conclusion: we demonstrate a higher incidence of post-LT stage 3 AKI in DCD, despite a better pre-LT liver function due to patient selection, compared to DBD. compared to previous studies we note that both DBD and DCD recipients suffer a similar degree of stage 1-2 of AKI but the DCD experience more severe stage 3 AKI
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
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