1,721,137 research outputs found
Petrosaspongia Bergquist 1995
No full textGenus Petrosaspongia Bergquist, 1995 Definition: Unarmoured Thorectinae with a dense secondary fibre reticulum rendering these sponges hard and incompressible. Very thin fibres, which seem to correspond to a tertiary network, are present in some places. Slightly modified from Cook and Bergquist (2002) Type species: Petrosaspongia nigra Bergquist, 1995 by monotypy.Published as part of Uriz, María - Jesús & Cebrian, Emma, 2006, Presence of the Indo – Pacific genus Petrosaspongia Bergquist, 1995 (Porifera: Demospongiae) in the Atlantic with description of a new species (P. pharmamari n. sp.), pp. 61-68 in Zootaxa 1209 on pages 62-63, DOI: 10.5281/zenodo.17242
Petrosaspongia nigra Bergquist 1995
No full textPetrosaspongia nigra Bergquist, 1995 pictures. Description External features Massive–lobulose with an unarmoured microconulose surface. Each conule ends in a thin projecting fibre (Fig. 1 A). Consistency stony, incompressible. Oscules spread on the surface, 1 –2.8 mm in diameter. Colour blackish outside, beige inside, in alcohol. Skeleton Reticulate with a dense network of secondary fibres forming meshes 80–225 m in diameter. They form fenestrate plates when they join the primary fibres. Primary fibres: 355–790 m in thickness, strongly cored by foreign debris (Fig. 1 B) Secondary fibres: 20–80 m (Fig. 3 A), laminated and completely free of foreign debris. (Fig. 1 B–C & Fig. 3 C). Through SEM, the surface of the secondary fibres appears rippled in a longitudinal direction (Fig. 1 C). Tertiary fibres: Very thin, rare. Choanosome containing abundant sand and other foreign materials (Fig. 1 D). Distribution: Southwest Pacific region, New Caledonia islands, from 10 to 38 m depth. Note. The re–examination of the holotype allowed us to measure the skeletal elements, and our results provide larger fibre diameters (particularly for the primary fibres) from those given by Bergquist (1995).Published as part of Uriz, María - Jesús & Cebrian, Emma, 2006, Presence of the Indo – Pacific genus Petrosaspongia Bergquist, 1995 (Porifera: Demospongiae) in the Atlantic with description of a new species (P. pharmamari n. sp.), pp. 61-68 in Zootaxa 1209 on pages 63-64, DOI: 10.5281/zenodo.17242
Petrosaspongia pharmamari Uriz & Cebrian, 2006, n. sp.
No full text<i>Petrosaspongia pharmamari</i> n. sp. <p>Material examined: 1 Specimen, 15 m depth, rocky bottom, El Hierro, Canary Islands. Holotype Nº CEAB.POR. BIO –190, Centre for Advanced Studies of Blanes, CSIC, Spain.</p> <p>Etymology: The species is dedicated to Pharmamar Company, for leading investigations in the field of new anti­cancer drugs from marine organisms and, particularly, from sponges.</p> <p>Type locality: El Hierro (Canary Islands, North Atlantic) sublittoral.</p> <p>Description</p> <p>External features</p> <p>Massive, lobulose specimen 6 cm high, 8 cm wide. Consistency very hard, almost incompressible. Ectosome detachable from the choanosome in shreds. Choanosome dense. Surface even, microconulose, unarmoured except at the conules, where the end of the primary fibres arises (Fig. 2 A). Oscules inconspicuous. Colour dark brown outside, beige inside.</p> <p>Skeleton</p> <p>Densely reticulate. Formed by irregular meshes of 35–660 m in diameter.</p> <p>Primary fibres: Irregular in thickness (532–975 m), cored with abundant foreign debris (Fig. 2 B).</p> <p>Secondary fibres: Free of foreign debris (45–115 m in diameter) (Fig. 3 B), strongly laminated (Fig. 2 C & 3D). Through SEM, the surface of the secondary fibres appears rippled in a longitudinal direction (Figs. 2 C & D). They form fenestrate plates at the zones where they join the primary fibres (Fig. 4 A).</p> <p>Considerable amounts of sand granules and other foreign materials are scattered throughout the choanosome (Fig. 4 B).</p> <p> Tertiary network made of very thin fibres (8–10 m in diameter) is visible only in some places, as in the type species of <i>Petrosaspongia</i> (Fig. 4 C).</p> <p>Distribution: Canary Islands, El Hierro (North Atlantic), rocky sublittoral, 15 m depth.</p>Published as part of <i>Uriz, María - Jesús & Cebrian, Emma, 2006, Presence of the Indo – Pacific genus Petrosaspongia Bergquist, 1995 (Porifera: Demospongiae) in the Atlantic with description of a new species (P. pharmamari n. sp.), pp. 61-68 in Zootaxa 1209</i> on pages 64-65, DOI: <a href="http://zenodo.org/record/172425">10.5281/zenodo.172425</a>
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
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