1,721,048 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
Parution : Geschichte der Azteken : Codex Aubin und verwandte Dokumente : aztekischer Text übersetzt und erläutert
No full textGeschichte der Azteken : Codex Aubin und verwandte Dokumente Lehmann, Walter (1878-1939). Éditeur scientifique Kutscher, Gerdt (1913-1979). Éditeur scientifique Vollmer, Günter. Éditeur scientifique Editeur : Berlin, [BRD] : Gebr. Mann Date de parution : 1981 Description matérielle : 1 vol. (XXXIII-354 p.) : ill., facsims. ; 30 cm Collection : (Quellenwerke zur alten Geschichte Amerikas aufgezeichnet in den Sprachen der Eingeborenen ; 13) (Veröffentlichungen des Ibero-Amerikanischen..
Aesop in Mexico: Die Fabeln des Aesop in aztekischer Sprache ; Texte mit deutscher und englischer Übersetzung ; Aus dem Nachlaß Gerdt Kutschers herausgegeben von Gordon Brotherston und Günter Vollmer
Full text linkkoamabayili/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
Estrogenic or anti-estrogenic effects of traditionally used tropical plant extracts on human U2OS cells
No full textFitoestrogeni su spojevi biljnog porijekla koji, zahvaljujući strukturnoj sličnosti sa 17β-estradiolom, posjeduju mogućnost vezanja na estrogenske receptore te mogu djelovati kao njihovi agonisti i/ili antagonisti. Fitoestrogenima se pripisuju brojni zdravstveni benefiti povezani sa kardiovaskularnim bolestima, hormonski ovisnim tumorima, osteoporozom i menopauzalnim simptomima. Tropska Afrička biljka, Mondia whitei (Hook.f.) Skeels, koristi se u tradicionalnoj medicini za liječenje raznih bolesti, no njezina upotreba najčešće se spominje vezano za spolne probleme muškaraca. To ukazuje na potencijalni mehanizam djelovanja povezan sa hormonima, te su u ovom radu ispitana estrogenska i anti-estrogenska svojstva metanolskog ekstrakta Mondie whitei i njegovih frakcija. Istraživanje je uključivalo serije transaktivacijskih testova u U2OS-ERα i U2OS-ERβ stanicama. U ispitanom metanolnskom ekstraktu nije pronađena niti estrogenska niti anti-estrogenska aktivnost. Jedna frakcija ekstrakta pokazala je agonističku aktivnost u obje stanične linije, dok antiestrogenska aktivnost nije zabilježena niti u jednoj frakciji. Također, ispitana je i toksičnost biljnog ekstrakta i frakcija, no zbog nekih neočekivanih opaženih efekata, savjetuje se ponoviti MTT test. Ovaj rad izrađen je u sklopu većeg “Angola Projekta” čiji je cilj dokazati i znanstveno utemeljiti učinke biljaka korištenih u tradicionalnoj medicini.Phytoestrogens are plant-derived compounds that, due to their structural similarity with 17β- estradiol, have an ability to bind to estrogen receptors and act as their agonists or/and antagonists. They have been reported to confer health benefits related to cardiovascular diseases, hormonedependent cancers, osteoporosis, and menopausal symptoms. A tropical African plant, Mondia whitei (Hook.f.) Skeels, is used as a traditional remedy to treat various conditions and diseases, but its use is most commonly reported in the terms of male sexual problems. This indicates potential hormonal-related mechanism of action, so this study evaluated estrogenic and anti-estrogenic properties of methanol extract of Mondia whitei and its fractions. Herbal extract and fractions were tested using estrogen receptor subtype specific transactivation assays in U2OS-ERα and U2OS-ERβ cells. In the examined methanol extract, neither estrogenic nor anti-estrogenic properties have been observed. One fraction of the extract showed agonistic activity in both cell lines, whereas none of the fractions showed anti-estrogenic potential. In addition to that, applied herbal treatments were examined for cytotoxicity, but due to some confounding effects observed, MTT assay is advised to be repeated. This study was conducted as part of the bigger project, “Angola Project”, which aims to a better, science based understanding of traditionally known medicinal uses of plants
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