1,720,963 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
Protective Effect of Amifostine on Radiotherapy-Applied Cardiovascular Tissue
No full textBackground: The present study evaluates the protective effect of amifostine (AMI) on acute toxicity in large vessels and the heart in rats with radiotherapy (RT) applied to the thorax. Methods: Twenty-one Wistar albino rats were randomly assigned to 3 groups: Alone RT (n = 7), amifostine plus RT (AMI+RT, n = 7), and control (n = 7) groups. The rats in the RT and AMI+RT groups received a single dose of 20 Gy radiation to the entire thorax. Prior to irradiation, AMI was administered intraperitoneally at a dose of 200 mg/kg, 30 minutes before the procedure. Five days after irradiation, the levels of p53, CD68, and COX in the vascular tissue (aorta) were measured, along with the levels of malondialdehyde (MDA) and glutathione (GSH) in the aortic and heart tissues. Results: The results showed that the level of MDA significantly increased after irradiation, but GSH levels did not change (P < .001 and P = 0.138). Malondialdehyde levels were significantly reduced by AMI, and GSH levels increased (P = .031 and P = .007). When comparing the control group with AMI + RT, MDA and glutathione levels were similar (P = .314 and P = .136). Histopathological evaluation revealed increased cellular inflammation (P = .002) and vascular damage (P = .015) in aortic tissue after thoracic RT irradiation, but no difference in terms of myofibrosis (P = .901) in heart tissue. Conclusion: AMI has a radioprotective and antioxidant effect against RT-induced cardiovascular toxicity.Institutional Scientific Research Projects UnitFunding: The authors thank the Institutional Scientific Research Projects Unit fortheir support
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
Evaluation of Risk Groups for the Prediction of Biochemical Progression in Patients Undergoing Radical Prostatectomy
No full textObjective: The aim of this study was to investigate the potential relationship between biochemical progression and prognostic risk factors in patients with prostate cancer (PCa) patients undergoing radical prostatectomy (RP). Materials and Methods: After inclusion/exclusion criteria were applied, 216 patients who underwent RP were included in this study. Follow-up protocol included prostate specific antigen (PSA) measurements; every 3 months for the first year, every 6 months for the second year, and an annual check after 2 years. Preoperative and postoperative PSA measurements, pathological stage, Gleason score (GS), extraprostatic extension, positive surgical margins and seminal vesicle invasion were evaluated. Uni- and multivariable analyses were used to detect the relationship between biochemical progression, biochemical progression-free survival (BPFS) and prognostic risk factors. Results: Median follow-up was 29 months. Biochemical progression was observed in 39 (18.1%) patients, in 18 (9.7%) of 185 patients with first postoperative PSA level of = 0.2 ng/dL. Patients with first postoperative PSA level of >= 0.2 ng/dL had a statistically significant higher risk of biochemical progression and shorter BPFS (odds ratio: 2.41; 95% confidence interval: 1.84-3.10; p= 0.2 ng/dL was the most important predictor of biochemical progression and BPFS after RP. GS >= 8, T3-4 stages, and positive surgical margins are also related to biochemical progression
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
Acute histopathological responses of testicular tissues after different fractionated abdominal irradiation in rats
No full textPurpose: To compare the effects of different fractionated doses of abdominal radiation therapy on acute histopathological responses of testicular tissues in rats. Methods: Thirty-three 3-week-old Wistar albino rats were randomized into 6 groups: group 1 (n = 5), control; group 2 (n = 4), hypofractionated total abdominal irradiation (TAI) of 6 Gy/1 fraction/day for 2 days; group 3 (n = 6), hypofractionated TAI of 4 Gy/1 fraction/day for 3 days; group 4 (n = 6), hypofractionated TAI of 3 Gy/1 fraction/day for 4 days; group 5 (n = 6), conventionally fractionated TAI of 2 Gy/1 fraction/day for 6 days; group 6 (n = 6), conventionally fractionated TAI of 1.7 Gy/1 fraction/day for 7 days. Mean epithelial length and diameter of seminiferous tubules of testicular tissues were determined after euthanasia. Results: Initially, a highly significant decrease in both the mean tubular diameter and epithelial height of the seminiferous tubules was demonstrated in all irradiated rats compared with the control group. No significant differences regarding both damage parameters were found between different hypofractionated radiation therapies. Both conventional radiation therapies reduced the epithelial height and mean diameter of the seminiferous tubules to a lesser extent when compared with 6 Gy/1 fraction/day hypofractionated therapy. It was further shown that parameter values were comparable between rats that received 3 Gy/day hypofractionated therapy and rats that received either of the two conventional therapies. Furthermore, although 4 Gy/day hypofractionation decreased tubular diameter and epithelial length to a greater degree compared with the conventional therapy of 1.7 Gy/1 fraction/day, no statistically significant difference was found when compared with conventional therapy of 2 Gy/1 fraction/day. Additionally, no statistically significant difference was demonstrated between the two types of conventional radiotherapy application. Conclusion: The present study demonstrated that hypofractionated abdominal irradiation leads to more prominent tissue damage in the testes than conventional irradiation
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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