1,721,013 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
A top-down linguistic approach to the analysis of genomic sequences: The metabotropic glutamate receptors 1 and 5 in human and in mouse as a case study.
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
Quasi-cellular systems: stochastic simulation analysis at nanoscale range
No full textBackground: The wet-lab synthesis of the simplest forms of life (minimal cells) is a challenging aspect in modern
synthetic biology. Quasi-cellular systems able to produce proteins directly from DNA can be obtained by
encapsulating the cell-free transcription/translation system PURESYSTEMTM(PS) in liposomes. It is possible to detect
the intra-vesicle protein production using DNA encoding for GFP and monitoring the fluorescence emission over
time. The entrapment of solutes in small-volume liposomes is a fundamental open problem. Stochastic simulation
is a valuable tool in the study of biochemical reaction at nanoscale range. QDC (Quick Direct-Method Controlled), a
stochastic simulation software based on the well-known Gillespie’s SSA algorithm, was used. A suitable model
formally describing the PS reactions network was developed, to predict, from inner species concentrations (very
difficult to measure in small-volumes), the resulting fluorescence signal (experimentally observable).
Results: Thanks to suitable features specific of QDC, we successfully formalized the dynamical coupling between
the transcription and translation processes that occurs in the real PS, thus bypassing the concurrent-only
environment of Gillespie’s algorithm. Simulations were firstly performed for large liposomes (2.67μm of diameter)
entrapping the PS to synthetize GFP. By varying the initial concentrations of the three main classes of molecules
involved in the PS (DNA, enzymes, consumables), we were able to stochastically simulate the time-course of GFPproduction.
The sigmoid fit of the GFP-production curves allowed us to extract three quantitative parameters
which are significantly dependent on the various initial states. Then we extended this study for small-volume
liposomes (575 nm of diameter), where it is more complex to infer the intra-vesicle composition, due to the
expected anomalous entrapment phenomena. We identified almost two extreme states that are forecasted to give
rise to significantly different experimental observables.
Conclusions: The present work is the first one describing in the detail the stochastic behavior of the PS. Thanks to our
results, an experimental approach is now possible, aimed at recording the GFP production kinetics in very small microemulsion
droplets or liposomes, and inferring, by using the simulation as a reverse-engineering procedure, the internal
solutes distribution, and shed light on the still unknown forces driving the entrapment phenomenon
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
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