1,720,962 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
Discovering and exploiting molecular markers to follow reductive dechlorination in growndwater and sediments
No full textMicrobial resource management is an emerging discipline aimed at the exploitation of complex microbial communities for addressing practical problems. For a straightforward management of such microbial communities the availability of suitable markers for process monitoring and detection of the microbial activities is an essential requirement especially for those processes occurring at low rates.
In the environmental field an impressive series of novel previously-non-recognized microbial processes have been discovered in the last twenty years, including those occurring in anaerobic conditions or along oxic/anoxic interfaces. Among others the anaerobic oxidation of ammonium and methane or the reductive dehalogenation. The latter is very interesting for the removal of chlorinated pollutants that represent a major class of persistent contaminants. These include chlorinated solvents that can contaminate groundwater due to the relatively high water solubility and polychlorinated byphenils (PCBs) that can be major contaminants of soil and sediments. In anaerobic conditions several bacteria have been shown to be capable of flowing electrons deriving from hydrogen or reduced organic compounds using halogenated compounds as electron acceptors. Such a metabolic process determines the displacement of the halogen with a net dehalogenation of the molecule. Despite these processes can be rather slow, they represent a useful tool for the detoxification of environmental matrices from the chlorinated pollutants and can be usefully exploited in situ at relatively low costs, provided that a suitable monitoring system for following the process is available.
Here we show the search of taxonomic and metabolic gene markers related to the dehalogenation of 1,2-dichloroethane (1,2-DCA) and polychlorinated byphenils. By establishing suitable microcosms we have enriched specific microbiomes capable of addressing the reductive dechlorination of 1,2- DCA from a polluted groundwater and PCBs from contaminated marine sediments. By studying the response of the corresponding microbial communities to the spiking of electron donors we were able to identify novel strains with reductive dechlorination potential and fishing out from the microbial metagenome of the systems novel reductive dehalogenases specifically linked to the dechlorination of 1,2-DCA or associated to the dechlorination of PCBs. The diversity of such enzymes their novelty and specificity for given chlorinated compounds is discussed together with the potential of their genes as suitable markers to follow the process of reductive dechlorination in the field.
This work has been conducted in the frame of the European Community FP7-KBBE-2010-4 project ULIXES, grant agreement N. 266473
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
COMPLEMENTARY ROLE OF TELE-THERMOGRAPHY AND NODAL STATUS IN BREAST CANCER PROGNOSIS. PRELIMINARY REPORT.
No full textkoamabayili/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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