1,720,955 research outputs found
Larval Description and Phylogenetic Placement of the South African Endemic Genera Coelhydrus Sharp and Darwinhydrus Sharp (Coleoptera: Dytiscidae: Hydroporinae: Hyphydrini)
Full text linkThe third instars of Coelhydrus brevicollis Sharp and Darwinhydrus solidus Sharp are described and illustrated for the first time, with detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi. A key for the identification of the third instars of the genera of Hyphydrini known in detail is provided. A parsimony analysis based on 49 informative larval characteristics was conducted using the program TNT. The consensus tree supports a placement of Coelhydrus Sharp and Darwinhydrus Sharp within the tribe Hyphydrini. Within the Hyphydrini, Coelhydrus is postulated to share a monophyletic origin with Hyphydrus Illiger and Desmopachria Babington. The phylogenetic placement of Darwinhydrus, however, remains contentious as our study found it part of an unresolved polytomy with Andex Sharp and Primospes Sharp.Fil: Alarie, Yves. Laurentian University; CanadáFil: Michat, Mariano Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Challet, Gilbert L.. Foothill Ranch; Estados Unido
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
Laccophilus alariei Megna, Deler-Hernandez, and Challet, new species
No full text<i>Laccophilus alariei</i> Megna, Deler-Hernández, and Challet, new species <p>(Figs. 1, 7, 13)</p> <p> <b>Holotype.</b> Male. <b>CUBA</b>, Guanahacabibes: El Verraco (21°55´08´´N 84°37´20´´W) 1 m, Pinar del Río Province, Cuba. 23-VII-2003 collected by Y. S. Megna and O. Bello (CZCTR).</p> <p> <b>Paratypes.</b> 2 males. Same date as the holotype. Other material examined: Total 2 specimens: Cuba, Isla de la Juventud, Punta del Este. 22-V-2006, collected by Y. S. Megna (CZCTR).</p> <p> <b>Diagnosis.</b> <i>Laccophilus alariei</i> is the largest species of the genus in the Antilles and North America (SBL= 8.13–8.56 mm), followed by <i>Laccophilus maculosus</i> Say (4.6–6.4 mm) (Larson <i>et al</i>. 2000), <i>Laccophilus sonorensis</i> Zimmerman (5.0–6.0 mm), and <i>Laccophilus quadrilineatus</i> Horn (5.0– 6.7 mm) (Zimmerman 1970). It has a color pattern similar to that of <i>L. quadrilineatus quadrilineatus</i> and <i>Laccophilus mistecus mistecus</i> Sharp from Mexico, but can be distinguished from those species by the following combination of characters: aedeagus strongly emarginate medially in ventral view (Fig. 7B); parameres with numerous setae near apex (Fig. 7D, E); last abdominal segment of male truncate; elytra without irrorations (Fig. 1). <i>Laccophilus alariei</i> belongs to the group of species that lack a metacoxal file and a rake-like ovipositor (Fig. 7G).</p> <p> <b>Description.</b> SBL= 8.13–8.56 mm; EW= 4.00– 4.14 mm; SBL/EW= 1.99–2.07 mm (Table 2). Dorsal surface of body brown to testaceous; head testaceous, with rufous marking posteriorly (Fig. 1); pronotum testaceous; elytra brown with testaceous maculations, yellow lateral stripes present, interrupted at midline with subbasal and medial extensions toward elytral disc, posterior stripes covering apical margin. Base of elytron with 3 longitudinal spots, one extending along elytral suture approximately to middle, and 5 small spots in a transverse row in posterior half (Fig. 1). Ventral surface rufous; antenna, mouthparts, fore- and midlegs testaceous. Prosternal process short. Aedeagus with apex curved; strongly emarginate in middle part in ventral view (Fig. 7B). Parameres with numerous setae apically (Figs. 7D, E). Oval plate as in Fig. 7F. Ovipositor rake-like (Fig. 7G).</p> <p> <b>Sexual Dimorphism.</b> Males do not have a metacoxal file and pro- and mesotarsomeres 1–3 are slightly widened, with sucker-like setae. The last abdominal segment is truncate with a sinuate apex in males, whereas it is produced in females.</p> <p> <b>Variation.</b> The basal elytral spots can be united to form an uninterrupted, irregular, and subbasal band. They can also be obsolescent so that the only visible spot is the one extended along the elytral suture. One specimen has a weakly colored longitudinal spot extending along the elytral suture. The small, irregularly arranged spots in the posterior half vary in form and can number from two to five.</p> <p> <b>Distribution.</b> <i>Laccophilus alariei</i> is recorded only from the western part of Cuba (Pinar del Río and Isla de la Juventud) (Fig. 13).</p> <p> <b>Etymology.</b> The specific epithet is a patronym honoring Dr. Yves Alarie (Laurentian University) for his broad contributions to the study of aquatic Coleoptera.</p> <p> <b>Ecology.</b> <i>Laccophilus alariei</i> has been collected in two coastal wetlands with abundant aquatic vegetation and muddy to stony sediments. Both localities are in a semideciduous forest habitat with sublittoral limestonel, which occurs in southern Cuba in three coastal areas: La Península de Guanahacabibes, Isla de la Juventud, and Ciénaga de Zapata (Matanzas province) (Arces 1978). This suggests a relationship between the distribution of <i>L. alariei</i> and soil type.</p>Published as part of <i>Megna, Yoandri S., Deler-Hernández, Albert & Challet, Gilbert L., 2011, Description Of A New Species Of Laccophilus Leach (Coleoptera: Dytiscidae), With Notes On Other Cuban Species, pp. 213-226 in The Coleopterists Bulletin 65 (3)</i> on page 218, DOI: 10.1649/072.065.0302, <a href="http://zenodo.org/record/10085379">http://zenodo.org/record/10085379</a>
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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