1,720,960 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
Association Between BoLA-DRB3.2 Polymorphism and Bovine Papillomavirus Infection for Bladder Tumor Risk in Podolica Cattle
Full text linkBlood samples from 260 unrelated cattle (132 animals affected by
papillomavirus-associated bladder tumors and 128 healthy) were genotyped using
the classic polymerase chain reaction/restriction fragment length polymorphism method
to screen MHC class II bovine leukocyte antigen-DRB3. 2 polymorphism. The DRB3∗22
allele was significantly (p ≤ 0.01) detected in healthy cattle, thus appearing to have
a negative association (protective effect) with virus infection of the urinary bladder
known to represent a bladder tumor risk for cattle living free at pasture. Considering the
two sequence alleles identified in animals carrying DRB3∗22, DRB3∗011:01 allele from
samples of animals harboring the unexpressed bovine papillomaviruses (BPV)-2 E5 gene
was characterized by amino acid residues believed to have a protective effect against
BPV infection such as arginine at position 71 (R71) in pocket 4, histidine at position 11
(H11) in pocket 6, and both glutamine at position 9 (Q9
) and serine at position 57 (S57) in
pocket 9 of the antigen-binding groove. The DRB3∗011:02v allele from affected animals
was characterized by amino acids believed to be susceptibility residues such as lysine
(K71), tyrosine (Y11), glutamic acid (E9
), and aspartic acid (D57) in these pockets. These
results suggest that animals harboring the DRB3∗011:01 allele may have a lower risk of
BPV infection and, consequently, a reduced risk of bladder tumors
A high resolution Copy Number Variant (CNV) scan based on Illumina’s 777k chip in the autochthonous Italian Valdostana Red Pied cattle population
No full textGene expression of hepatic glucocorticoid receptor NR3C1 and correlation with plasmatic corticosterone in Italian chickens.
No full textThis study examined breed-specific stress related hormonal and gene expression profiles in 10
three Italian chicken breeds (Valdarnese Bianca, Bionda Piemontese, Robusta Maculata)
reared in controlled conditions. Glucocorticoids work through the glucocorticoid receptor
(GR), which modulates target genes transcription. We investigated breed-specific changes
in corticosterone (ELISA) and GR expression. GR mRNA levels were analyzed using
one-tube, two-temperature real-time PCR for absolute quantification of the gene expression 15
by the standard curve method. Our results show high expression of GR in hepatic tissue. Significant
effect of the breed was recorded for plasma corticosterone concentration: Valdarnese
Bianca 3.35 ng/ml, Bionda Piemontese 1.73 ng/ml, Robusta Maculata 2.02 ng/ml. Breed
specific gene expression has been recorded with a GR ranging from 1.12Eþ04 (Robusta
Maculata) to 1.00Eþ05 (Bionda Piemontese) mRNA copy number/100 ng total RNA. 20
Negative correlation was found between gene expression and blood corticosterone level
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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