1,721,085 research outputs found
Antiviral surfaces and coatings and their mechanisms of action
No full textViral infections are a serious health challenge, and the COVID-19 pandemic has increased the demand for antiviral measures and treatments for clean surfaces, especially in public places. Here, we review a range of natural and synthetic surface materials and coatings with antiviral properties, including metals, polymers and biopolymers, graphene and antimicrobial peptides, and their underpinning antiviral mechanisms. We also discuss the physico-chemical properties of surfaces which influence virus attachment and persistence on surfaces. Finally, an overview is given of the current practices and applications of antiviral and virucidal materials and coatings in consumer products, personal protective equipment, healthcare and public settings
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
Letter. Ceftriaxone drug alert: no longer for first line use in meningococcal sepsis.
No full textAlthough UK and international high income country practice has been to recommend ceftriaxone or cefotaxime as first line therapy for the initial treatment of paediatric sepsis, the US FDA has issued an alert1 that has led to changes in the US label for ceftriaxone.2 Due to concerns regarding the potential for calcium chelation in vivo, ceftriaxone must no longer be administered within 48 h of the completion of infusions of calcium-containing solutions, including parenteral nutrition, regardless of whether the drugs are administered by different infusion catheters.1 2 In the UK, the current drug safety bulletin3 states that ceftriaxone must not be given simultaneously with calcium-containing infusions.
We would therefore like to update the antibiotic recommendation made in our meningococcal therapy guideline update published in the April 2007 issue of ADC4 as follows: "Cefotaxime should be used as the first line antibiotic in meningococcal sepsis due to the high incidence of calcium replacement requirement in severe disease. However, ceftriaxone may still be considered as first line therapy in children with clinical meningitis, and for continuation of sepsis therapy after the acute phase when calcium infusions are no longer required. Where children are admitted for observation following cefotaxime for suspected sepsis and are subsequently assessed as being well enough for discharge on ambulatory intravenous antibiotics, the antibiotic may be changed to ceftriaxone (where the once/day dose regimen may be of benefit) and the first dose administered 8 hours following the last dose of cefotaxime given, assuming no calcium containing infusions have been used or are planned". The Meningitis Research Foundation will be making appropriate changes to their educational literature. <br/
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
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