1,721,004 research outputs found
Directional asymmetry in Paussus favieri (Coleoptera: Carabidae: Paussini)
No full textMost animals have a body plan that is bilaterally symmetric,
at least externally. In some species, however, directional
asymmetry (DA) occurs, where there is a preferential
‐ 32 ‐
direction of asymmetries, with one side that differs
systematically from the other. Although it was first thought
tat DA is relatively rare, subtle DA has been found in all
studies that examined asymmetries with geometric
morphometric techniques.
Until now all the studies have looked at only one structure
or at the comparison between modules. Here we analysed
directional asymmetries of several different parts showing
matching and object symmetries in Paussus favieri
(Coleoptera, Carabidae, Paussini). Because beetles of the
tribe Paussini are parasites of ants they are of great interest
because of the striking myrmecophilous adaptations. Most
of the species are extremely rare and localized, and their
biology and systematics are still poorly known. We used
geometric morphometric techniques to analyze the
variation of antennae (both left and right), head, pronotum
and abdomen in P. favieri (a relatively common species)
from different European and Maghrebian localities.
A clear and high evidence of a pattern of directional
asymmetry emerged from the analyses in all parts
examined. In particular principal component analysis
revealed a pattern of variation associated with DA, higher
in the antennae, but still present in all other body parts
except of the abdomen. In all analyses differences between
populations emerged as well.
Finally, Procrustes ANOVA provides similar results. For size
DA was statistically significant in all body parts except the
abdomen. For shape DA was significant only in the
antennae.
From our analyses antennae have emerged as the part
most under the DA, with a high shape and size variability.
Moreover differences between populations emerged, with
Moroccan population showing the highest differences.
We conclude that multiple body parts have directional
asymmetry, and the differences find between populations
show that directional asymmetry is evolving
Molecular phylogeny of murid Rodents: Implications for systematics, paleobiogeography, morphological and molecular evolution
No full text‘Molecular phylogeny of murid Rodents: Implications for systematics, paleobiogeography, morphological and molecular evolution’. Conferencia impartida por la Dra. Pascale Chevret de l´Institut de Génomique Fonctionnelle de Lyon, (ENS de Lyon, Francia). Salón de grados de la Facultad de Medicina
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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