1,720,976 research outputs found
The nef gene of human immunodeficiency virus type-1 (HIV1) is required for optimal virus replication in fully activated primary T lymphocytes
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
Studies on the mechanisms of HTLV-I leukemogenesis.
No full textThe factors that regulate low viral expression and long latency after HTLV-I infection are poorly understood. To study the possible mechanisms involved in the regulation of gene expression and cell transformation, we studied whether (1) methylation could play a role in viral transcription, and (2) tax product could favor chromosomal instability. The results indicate that methylation of HTLV-I LTRs blocks their transcriptional activity and that tax protein triggers DNA damage
Direct HPLC enantioseparation of chiral aptazepine derivatives on coated and bonded polysaccharide-based chiral stationery phases.
No full textThe direct HPLC enantioseparation of Mianserin and a series of aptazepine
derivatives is accomplished on polysaccharide-based chiral stationary phases
(CSPs). The resolutions are performed on the coated-type Chiralcel OD and Chiralpak
AD CSPs and on the first commercially available immobilized-type Chiralpak IA CSP,
in normal-phase and polar-organic modes. The complete separation of enantiomers of
all racemates investigated was successfully achieved under at least one of CSP/eluent
combinations employed. Pure alcohols such ethanol or 2-propanol, with a fixed percentage
of DEA added, serve as valuable alternatives to the more common n-hexanebased
normal-phase eluents in resolution of Mianserin on the AD CSP. In order to
study the chiroptical properties of aptazepine derivatives, chromatographic resolutions
are carried out at semipreparative scale using Chiralpak AD and Chiralpak IA as CSPs.
Nonconventional dichloromethane-based eluents have permitted to expand the chiral
resolving ability of the immobilized Chiralpak IA CSP and to perform mg-scale enantioseparations
with an analytical-size column. Assignment of the absolute configuration of
the separated enantiomers is empirically established by comparing their chiroptical
data with those of structurally related Mianserin. Chirality 18:621–632, 2006.
VVC 2006 Wiley-Liss, Inc
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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