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
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
Improved exercise tolerance after losartan and enalapril in heart failure: correlation with changes in skeletal muscle myosin heavy chain composition
No full textBACKGROUND: In congestive heart failure, fatigue-resistant, oxidative, slow type
I fibers are decreased in leg skeletal muscle, contributing to exercise capacity
(EC) limitation. The mechanisms by which ACE inhibitors and AII antagonists
improve EC is still unclear. We tested the hypothesis that improvement in EC is
related to changes in skeletal muscle composition toward type I fibers.
METHODS AND RESULTS: Eight patients with congestive heart failure, NYHA classes I
through IV, were treated for 6 months with enalapril (E) 20 mg/d, and another 8
with losartan (L) 50 mg/d. EC was assessed with maximal cardiopulmonary exercise
testing at baseline and after treatment. Myosin heavy chain (MHC) composition of
the gastrocnemius was studied after electrophoretic separation of slow MHC1, fast
oxidative MHC2a, and fast glycolytic MHC2b isoforms from needle microbiopsies
obtained at baseline and after 6 months. EC improved in both groups. Peak V(O2)
increased from 21.0+/-4.7 to 27.6+/-4.3 mL . kg-1 . min -1 (P=0.011) in the L
group and from 17.5+/-5.0 to 25.0+/-5.5 mL . kg-1 . min -1 (P=0.014) in the E
group. Similarly, ventilatory threshold changed from 15.0+/-4.0 to 19.9+/-4.9 mL
(P=0. 049) with L and from 12.0+/-1.9 to 15.4+/-3.5 mL (P=0.039) with E. MCH1
increased from 61.2+/-11.2% to 75.4+/-7.6% with L (P=0.012) and from 60.6+/-13.1%
to 80.1+/-10.9% (P=0.006) with E. Similarly, MHC2a decreased from 21.20+/-9.5% to
12.9+/-4.4% (P=0.05) with L and from 19.9+/-7.8% to 11.8+/-7.9% (P=0.06) with E.
MHC2b changed from 17. 5+/-6.5% to 11.7+/-5.2% (P=0.07) with L and from
19.5+/-6.4% to 8. 1+/-4.6% (P=0.0015) with E. There was a significant correlation
between net changes in MHC1 and absolute changes in peak V(O2) (r2=0.29, P=0.029)
and a trend to significance for MHC2a and 2b.
CONCLUSIONS: Six months' treatment with L and with E produces an improvement in
EC of similar magnitude. These changes are accompanied by a reshift of MHCs of
leg skeletal muscle toward the slow, more fatigue-resistant isoforms. Magnitude
of MHC1 changes correlates with the net peak V(O2) gain, which suggests that
improved EC may be caused by favorable biochemical changes occurring in the
skeletal muscle
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
Apoptosis of skeletal muscle myofibers and interstitial cells in experimental heart failure
No full textCongestive heart failure (CHF) is characterized by a limb skeletal muscle myopathy with shift from the slow aerobic, fatigue resistant fibers, to the fast, anaerobic ones, and muscle bulk loss. Apoptosis (A) has been recently demonstrated to play a role in several cardiovascular diseases. Aim of the study: we have investigated the role of A in the skeletal muscle of the hindlimbs in an experimental model of CHF. Animals and methods: CHF was induced in 7 males 80-100 g Sprague-Dawley rats with 30 mg/kg monocrotaline. Five age and diet matched controls were also studied. The time course of A was also studied in additional animals at day 0, 17, 24 and 30 days. Results: At day 27 the electrophoretic analysis of myosin heavy chains (MHCs) demonstrated in the CHF rats the occurrence of a myopathy, with disappearance of slow MHC1 in the Tibialis Anterior (TA), and a significant shift from the slow to the fast isoforms in the soleus and EDL. With in situ DNA nick-end labelling (TUNEL) we found..
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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