1,721,044 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
Application of crossflow ultrafiltration for scaling up the purification of a recombinant ferritin
Full text linkFerritin proteins are taking center stage as smart nanocarriers for drug delivery due to their hollow cage-like structures and their unique 24-meric assembly. Among all ferritins, the chimeric Archaeoglobus ferritin (HumFt) is able assemble/disassemble varying the ionic strength of the medium while recognizing human TfR1 receptor overexpressed in cancer cells. In this paper we present a highly efficient, large scale purification protocol mainly based on crossflow ultrafiltration, starting from fermented bacterial paste. This procedure allows one to obtain about 2 g of purified protein starting from 100 g of fermented bacterial paste. The current procedure can easily remove contaminant proteins as well as DNA molecules in the absence of expensive and time consuming chromatographic steps
Harnessing buffer solutions to modify the association state of Ferritin nanoparticles
Full text linkRecent years have witnessed remarkable progress in the field of drug delivery driven by the pursuit of efficient and targeted delivery systems [1,2]. Among the promising candidates for such systems are ferritins, nanoparticles distinguished by their unique hollow sphere structure and the ability to specifically target cell surface receptors [3,4]. In a groundbreaking study, researchers developed a chimeric ferritin protein derived from both human and archaeal sources. This innovative design incorporates the BC loop of human H ferritin, endowing the chimeric ferritin with CD71 recognition capabilities [5]. Furthermore, the researchers introduced a novel modification to the ferritin protein, enhancing its drug delivery potential by utilizing buffer solutions to finely tune its assembly and disassembly properties [6]. These advancements open up new avenues for the study of encapsulation and delivery of small therapeutic and diagnostic molecules
Near infrared absorption spectra of human deoxy- and oxyhaemoglobin in the temperature range 20-40 degrees C
No full textTemperature-dependent spectral changes of human haemoglobin A (HbA) derivatives were investigated in the range 20-40 degrees C. The intensity of the deoxy-HbA decreased by 3-3.5%, while that of oxy- and met-HbA by less than 1%, when the temperature increased from 20 degrees to 40 degrees C. The present findings can be employed to improve the algorithms used in in vivo near infrared spectroscopy. (C) 1997 Elsevier Science B.V
A novel mechanism of heme-heme interaction in the homodimeric hemoglobin from Scapharca inaequivalvis as manifested upon cleavage of the proximal Fe-N epsilon bond at low pH
No full textDispelling 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
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