1,720,955 research outputs found
Studi in vivo potensi flavonoid ekstrak songgolangit (Tridax procumbens L.) sebagai bentuk protektif radikal bebas pada saluran pernapasan perokok aktif
No full textAsap rokok merupakan salah satu sumber radikal bebas yang dapat merusak sel dan jaringan saluran pernapasan. Tridax procumbens L. memiliki potensi sebagai antioksidan karena mengandung flavonoid yang berperan dalam menangkal radikal bebas. Penelitian ini bertujuan untuk mengetahui potensi Tridax procumbens L. sebagai sumber antioksidan terhadap kadar SOD pada tikus Wistar yang terpapar asap rokok. Penelitian ini menggunakan tikus Wistar (25 ekor) dengan 5 perlakuan yang terdiri dari K (aquadest), KN (dipapar asap rokok), P1 (dipapar asap rokok dan diberi ekstrak 100 mg/kg BB), P2 (dipapar asap rokok dan diberi ekstrak 200 mg/kg BB), dan P3 (dipapar asap rokok dan diberi ekstrak 300 mg/kg BB). Pemberian ekstrak dilakukan pada hari ke-1 sampai hari ke-21 dan pemaparan asap rokok dilakukan pada hari ke-8 sampai hari ke-21. Parameter yang diamati terdiri dari uji kadar flavonoid (dengan metode KLT, kadar flavonoid total, dan kadar fenolik total), berat badan, kadar SOD (metode whole blood). Data dianalisis dengan uji ANOVA satu arah dan (P0,05), namun kadar SOD berbeda antar perlakuan (P<0,05) dengan dosis yang paling optimum adalah 300 mg/kg BB. Kesimpulannya menunjukkan bahwa dosis 300 mg/kg BB ekstrak etanol Tridax procumbens L. dapat berperan sebagai antioksidan alami dari paparan asap rokok secara in vitro
Antioxidant Potential of the Asteraceae Family in Counteracting Free Radicals in Cigarette Smoke: An Overview
No full textCigarette smoke exposure triggers oxidative stress in the respiratory system through an increase in free radicals and a decrease in endogenous antioxidant activity, which contributes to lung damage and chronic diseases such as COPD and lung cancer. This study aims to investigate the potential of species from the Asteraceae family as a source of natural antioxidants in protecting the lungs and trachea from damage caused by exposure to free radicals in cigarette smoke. The method used is a Systematic Literature Review (SLR) with reference to the PRISMA 2020 guidelines. Literature searches were conducted systematically through the PubMed, ScienceDirect, and Google Scholar databases until June 2025. The inclusion criteria included in vivo studies using Asteraceae plant extracts in animals with induced oxidative stress in the respiratory system, as well as involving the measurement of biomarkers such as MDA, GSH, SOD, and CAT. Of the 198 articles found, 10 articles met the criteria and included species such as Tridax procumbens, Chromolaena odorata, Pulicaria petiolaris, and Baccharis retusa. The results showed that these species had significant antioxidant activity through their flavonoid, polyphenol, and triterpenoid compound content. However, most studies did not use a direct cigarette smoke exposure model. In conclusion, the Asteraceae family has great potential as a source of natural antioxidants to protect the respiratory system from oxidative stress, although further research with more relevant exposure models is needed. Toxicology and metabolomics approaches are also needed to strengthen the evidence for practical application in the treatment of lung diseases caused by cigarette smoke
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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