1,721,000 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
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
Subverted signalling by protein kinase CK2 in Delta F508 CFTR expressing cells
No full textCystic Fibrosis (CF) is almost invariably caused by mutations
occurring in the Cystic Fibrosis Transmembrane Regulator
(CFTR), a protein involved in chloride transport across the cell
membrane. The commonest mutation (accounting for 70% or
more of all CF cases) is the deletion of phenylalanine 508
(DF508) in the nucleotide binding domain-1 (NBD1) of CFTR,
which leads to premature degradation of the nascent protein with
consequent alterations of diverse cellular functions. We recently
showed that protein kinase CK2, which unlike the other protein
kinases has no recognised factors controlling its activity, is susceptible
to allosteric modulation in vitro by peptides reproducing
the sequence encompassing the F508 deletion of CFTR. Consequently
the targeting of several substrates by CK2 is deeply
altered by these DF peptides [1,2]. This prompted us to hypothesize
that in DF508 CFTR expressing cells signalling by CK2
might be subverted, rendering CK2 a new target for therapies
aimed at treating CF.
Lysates of cell lines expressing either wild type or DF508 CFTR
incubated with 32P-GTP in the presence or absence of selective
CK2 inhibitors exhibit significant alterations in the phosphorylation
of CK2 protein substrates. By MS analysis, a number of
proteins whose phosphorylation by CK2 is altered in DF508 cells,
have been identified and some of these have been recognized as
implicated in the process of maturation, stabilization and degradation
of CFTR. Treatment of cells with selective CK2 inhibitors
affects the protein level of CFTR, both wild type and DF508, disclosing
the possibility that modulation of CK2-dependent phosphorylation
may represent a tool for the regulation of expression
and maturation of CFTR, especially in a DF508 CFTR background.
References:
1. Pagano M. A. et al. Biochemistry 2008; 47, 7925–7936.
2. Pagano M. A. et al. Biochem J 2010; 426, 19–29
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
2D and 3D chemical imaging of Li-ion battery electrodes at nanoscale resolution
No full textA new chemical imaging technique, 3D XANES microscopy, combines the high resolution and large field of view (FOV) of full-field transmission X-ray microscopy (TXM) with the chemical speciation capabilities of X-ray absorption near edge structure (XANES) to visualize the sample’s chemistry in 2D and 3D. This technique is a powerful method to examine the relationship between morphology and chemical speciation in complex materials with hierarchical structure such as battery electrodes. 3D XANES TXM offers chemical speciation at the nanoscale in thick samples (up to 30 μm) with minimal preparation requirements. Further, because it is not a scanning technique, its high throughput allows the analysis of large areas in minutes to a few hours.
Using the TXM on beam line 6-2 at the Stanford Synchrotron Radiation Lightsource (SSRL), which is capable of imaging from 4.5 to 14 keV with down to 30 nm resolution and up to 30 micron FOV, the 3D XANES microscopic technique has been used to construct chemical maps of various composite systems in 2D and 3D. Concepts of technique and data processing which involves the evaluation of up to 1 Million XANES spectra for a single 2D map will be discussed and results from XANES microscopy of Li-ion battery electrodes and other materials will be presented
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