1,720,983 research outputs found
Identification of the Tubulin Gene Family and Sequence Determination of One β-Tubulin Gene in a Cold-Poikilotherm Protozoan, the Antarctic Ciliate Euplotes focardii
No full text
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
Genetics Society of America
No full textCILIATES PLENARY AND PLATFORM SESSION ABSTRACTS
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C29 Transcriptome analysis in the Antarctic ciliate Euplotes focardii: molecular basis of cold adaptation and insights regarding the potential
impact of climate change. Cristina Miceli, Sandra Pucciarelli, Patrizia Ballarini, Angela Piersanti, Kesava Pryan Ramasamy. School of
Biosciences and Veterinary Medicine, University of Camerino, IT.
Ciliates provide optimal model systems to study environmental adaptation. Comparative transcriptome analysis of Euplotes focardii, a strictly
psychrophilic ciliate isolated from Antarctic seawater, and the mesophilic congeneric species E. crassus revealed that in E. focardii the majority
of the expressed genes code for proteins involved in oxidoreductase activity, as reported for Antarctic fishes and krill. These results confirm
that a major problem of Antarctic marine organisms is to cope with increased O2 solubility at low temperatures. They also suggest that an
increased defense against oxidative stress likely provides an important evolutionary feature that allowed the adaptation of Antarctic organisms
in their oxygen-rich environment. Gene ontology annotation also revealed that many of the transcripts encoded proteins involved in
maintenance of protein homeostasis (e.g., chaperones). Quantitative PCR showed that expression of Hsp70 genes was induced when E. focardii
cells were subjected to oxidative stress, whereas thermal stress did not cause induction. These results argue that E. focardii in its current
environment is well protected against reactive oxygen species and are consistent with prior reports of constitutive Hsp70 expression as a
defense against cold-induced protein denaturation. E. focardii appears to be poised to cope with the oxidative challenge that is likely to
accompany oceanic warming over the next century, but the absence of a temperature-inducible chaperone response may place its proteome at
risk.
The comparative analysis of the Euplotes species also revealed a rapid evolution and unusual plasticity of the programmed +1 ribosomal
frameshifting, a process that allows the change of the reading frame during translation. This process appears pervasive in Euplotes as it affects
decoding of over 3,000 genes in these genomes and it is not conserved in the affected genes of the two species. In addition, evidence for +2
frameshifting appeared from the analysis.
We are currently setting up reverse genetics in E. focardii in order to have a better understanding of the function of some genes that are
expressed only in the cold adapted species
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