1,720,959 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
Combination therapy with lercanidipine and enalapril reduced central blood pressure augmentation in hypertensive patients with metabolic syndrome
No full textArterial stiffness and blood pressure (BP) augmentation are independent predictors of cardiovascular events. In a randomized, open, parallel group study we compared the effect on these parameters of combination therapy with an ACE-inhibitor plus calcium channel blocker or thiazide diuretic in 76 hypertensive patients with metabolic syndrome uncontrolled by ACE-inhibitor monotherapy.After 4. weeks run-in with enalapril (ENA, 20 mg), patients were randomized to a combination therapy with lercanidipine (LER, 10-20 mg) or hydrochlorothiazide (HCT, 12.5-25 mg) for 24. weeks. Aortic stiffness (carotid to femoral pulse wave velocity, PWV), central BP values and augmentation (augmentation index, AIx) were measured by applanation tonometry.The two groups showed similar office and central BP after run-in. Office (ENA/LER: from 149.1. ±. 4.9/94.5. ±. 1.5 to 131.7. ±. 8.1/82.2. ±. 5.3; ENA/HCT: from 150.3. ±. 4.7/94.7. ±. 2.1 to 133.1. ±. 7.1/82.8. ±. 5.3 mm. Hg) and central BP (ENA/LER 127.4. ±. 17.1/85.2. ±. 12.1 to 120.5. ±. 13.5/80.0. ±. 9.5 mm. Hg; ENA/HCT 121.6. ±. 13.4/79.3. ±. 9.5 mm. Hg) were similarly reduced after 24. weeks. PWV was comparable after run-in and not differently reduced by the two treatments (ENA/LER from 8.6. ±. 1.5 to 8.1. ±. 1.3 m/s, p. <. 0.05; ENA/HCT from 8.5. ±. 1.2 to 8.2. ±. 1.0 m/s, p. <. 0.05). Finally, both combinations reduced AIx, but its reduction was significantly greater (p. <. 0.05) in ENA/LER (from 26.8. ±. 10.9 to 20.6. ±. 9.1%) than in ENA/HCT arm (from 28.2. ±. 9.0 to 24.7. ±. 8.7%).In conclusion, the combination with LER caused a similar PWV reduction as compared to HCT, but a greater reduction in AIx in hypertensive patients with metabolic syndrome not controlled by ENA alone. These results indicate a positive effect of the combination of ENA/LER on central BP augmentation, suggesting a potential additive role for cardiovascular protection
Carotid and aortic stiffness in essential hypertension and their relation with target organ damage: the CATOD study
No full textAbstract
OBJECTIVE:
The objective of the study is to investigate in the hypertensive population the possible differential association between increased aortic and/or carotid stiffness and organ damage in multiple districts, such as the kidney, the vessels, and the heart.
METHODS:
In 314 essential hypertensive patients, carotid-femoral pulse wave velocity (cfPWV, by applanation tonometry) and carotid stiffness (from ultrasound images analysis), together with left ventricular hypertrophy, carotid intima-media thickness, urinary albumin-creatinin ratio, and glomerular filtration rate were measured. Increased cfPWV and carotid stiffness were defined according to either international reference values or the 90th percentile of a local control group (110 age and sex-matched healthy individuals).
RESULTS:
When considering the 90th percentile of a local control group, increased cfPWV was associated with reduced glomerular filtration rate, either when carotid stiffness was increased [odds ratio (OR) 13.27 (confidence limits (CL) 95% 3.86-45.58)] or not [OR 7.39 (CL95% 2.25-24.28)], whereas increased carotid stiffness was associated with left ventricular hypertrophy, either when cfPWV was increased [OR 2.86 (CL95% 1.15-7.09)] or not [OR 2.81 (CL95% 1.13-6.97)]. No association between increased cfPWV or carotid stiffness and target organ damage was found when cutoffs obtained by international reference values were used. The concomitance of both increased cfPWV and carotid stiffness did not have an additive effect on organ damage.
CONCLUSION:
Aortic and carotid stiffness are differentially associated with target organ damage in hypertensive patients. Regional arterial stiffness as assessed by cfPWV is associated with renal organ damage and local carotid stiffness with cardiac organ damag
Combination therapy with lercanidipine and enalapril reduced central blood pressure augmentation in hypertensive patients with metabolic syndrome
No full textArterial stiffness and blood pressure (BP) augmentation are independent predictors of cardiovascular events. In a randomized, open, parallel group study we compared the effect on these parameters of combination therapy with an ACE-inhibitor plus calcium channel blocker or thiazide diuretic in 76 hypertensive patients with metabolic syndrome uncontrolled by ACE-inhibitor monotherapy. After 4weeks run-in with enalapril (ENA, 20mg), patients were randomized to a combination therapy with lercanidipine (LER, 10-20mg) or hydrochlorothiazide (HCT, 12.5-25mg) for 24weeks. Aortic stiffness (carotid to femoral pulse wave velocity, PWV), central BP values and augmentation (augmentation index, AIx) were measured by applanation tonometry. The two groups showed similar office and central BP after run-in. Office (ENA/LER: from 149.1±4.9/94.5±1.5 to 131.7±8.1/82.2±5.3; ENA/HCT: from 150.3±4.7/94.7±2.1 to 133.1±7.1/82.8±5.3mmHg) and central BP (ENA/LER 127.4±17.1/85.2±12.1 to 120.5±13.5/80.0±9.5mmHg; ENA/HCT 121.6±13.4/79.3±9.5mmHg) were similarly reduced after 24weeks. PWV was comparable after run-in and not differently reduced by the two treatments (ENA/LER from 8.6±1.5 to 8.1±1.3m/s, p<0.05; ENA/HCT from 8.5±1.2 to 8.2±1.0m/s, p<0.05). Finally, both combinations reduced AIx, but its reduction was significantly greater (p<0.05) in ENA/LER (from 26.8±10.9 to 20.6±9.1%) than in ENA/HCT arm (from 28.2±9.0 to 24.7±8.7%). In conclusion, the combination with LER caused a similar PWV reduction as compared to HCT, but a greater reduction in AIx in hypertensive patients with metabolic syndrome not controlled by ENA alone. These results indicate a positive effect of the combination of ENA/LER on central BP augmentation, suggesting a potential additive role for cardiovascular protection
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
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