1,721,020 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
Protection of mitochondria during cold storage of liver and following transplantation: comparison of the two solutions, University of Wisconsin and Eurocollins
Full text linkAbstract Injury to allografts during ischaemia/reperfusion
contribute to the development of graft failure following transplantation
with significant morbidity and mortality to patients.
The development of University ofWisconsin solution
has significantly improved the quality of graft preservation
and transplant outcome relative to formerly used solutions
such as Eurocollins. The aim of this study was to further
characterize mitochondrial structural and functional alterations
occurring in rat livers following cold storage and
transplantation. Mitochondrial impairment after prolonged
storage in Eurocollins included decreased cyt. c+c1, cyt. b
and cyt. a+a3 concentration and dramatic falls in the activities
of the respiratory chain enzymes ubiquinol-cyt. c
oxidoreductase and cytochrome oxidase. Under the same
conditions the highest hydroperoxide but lowest vitamin E
concentrations were also found. Although both the Eurocollins
and University of Wisconsin preservation solutions
have limitations in preventing oxidative injuries following
cold storage and reperfusion, our data indicate that mitochondrial
impairment was higher in Eurocollins- than
in University of Wisconsin-stored livers. Further improvements
are necessary in maintaining the stability of mitochondria
in order to optimize preservations solutions used in
transplantations
University of Wisconsin (UW) solution is a better storing medium than Euro-Collins (EC) for rat livers to be transplanted
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Valore prognostico dell'indice Apache II nell'impiego routinario preoperatorio in chirurgia generale maggiore
No full textGlyoxalase II and glutathione levels in rat liver mitochondria during cold storage in Euro-Collins and University of Wisconsin solutions
No full textValore prognostico dell'indice Apache II nell'impiego routinario preoperatorio in chirurgia generale maggiore
No full textThe authors examined the prognostic value, in daily preoperative practice, of Apache II scoring system in 187 patients undergoing elective or emergency major general surgery, and compared it with those of more traditional classification systems, such as the American Society of Anesthesiologists (ASA) classification system and the Weighted Scale of Operartive Risk (WSOR). Logistic regression analysis and ROC (Receiver Operating Characteristic) curve analysis confirmed Apache II system to have good predictive value for mortality and morbidity; it was superior to the examined traditional classification systems in prediction of outcome after surgery (area under curve 0.89 for the Apache II index, 0.78 for the ASA classification system 0.79 for the WSOR). The Apache II score deprived of the age points (area under curve 0.98) showed the same prognostic power of the complete score (area under curve 0.89), so age alone was not a significant variable in our experience. If used in daily practice the preoperative Apache II score may be used by clinicians to evaluate before surgery the risk of postoperative morbidity and death in major general surgery
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