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A new species of Tucetona (Bivalvia: Glycymerididae) from Mexico
No full textValentich-Scott, Paul, Garfinkle, Elizabeth A. R. (2011): A new species of Tucetona (Bivalvia: Glycymerididae) from Mexico. Zootaxa 2769: 65-68, DOI: 10.5281/zenodo.27686
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
Tucetona isabellae Valentich-Scott & Garfinkle, new species
No full textTucetona isabellae Valentich-Scott & Garfinkle, new species Figures 1 A –G Glycymeris (Glycymeris) cabazoni Bramkamp, 1935, unnumbered pages, plate 2, figures 2, 3; Tucetona (Bellaxinaea) new species, Powell, 1986: 79 –81, plate 2, figures 5, 7. Shell shape. Subovate to subtrigonal, moderately inflated, height and length about equal; beaks narrow, pointed, opisthogyrate. Sculpture and color. About 29 (20–48, n= 15) heavy, broad radial ribs, many bifurcate in larger specimens, overlain by strong, fine, well-spaced, commarginal ribs forming crossbars over ribs and in interspaces; interspaces moderately wide, frequently with intercalary ribs; periostracum inconspicuous; exterior color tan, with few dark brown blotches; interior color white to cream, with brown mottling in some specimens, some specimens mostly brown internally. Hinge. Hinge plate curved, narrow, posterior tooth series about 8 (4–11, n= 10), anterior about 7 (3–11), ligament asymmetrical, much longer anteriorly, moderate in length, moderately narrow, with about 3 (2–6) chevron grooves. Adductor muscle and pallial scars. Moderate in size, moderately impressed, anterior scar subovate, posterior scar ovate-elongate; pallial line narrow, with long, narrow dorsally directed lines extending from it. Inner ventral crenulations. About 24 (14–43) rectangular, flat topped. Distribution. Modern specimens are only known from a small region off the northwest end of Isla Smith, Baja California, Mexico (29.1° N), 120– 170 m. Fossil specimens are present in the late Miocene “Imperial” Formation in Riverside County, southern California (Powell, 1986; 1988). Type locality and type specimens. Mexico, Baja California, off the northwest end of Isla Smith; 29 °05’ 12 ”N, 113 ° 32 ’ 12 ”W; 120– 170 m. All paratypes listed below are from the same lot as the holotype. Holotype. SBMNH 149636, length 14.5 mm, height 15.0 mm. Paratypes. SBMNH 149637, 34 paired valves, 31 separate valves; BMNH 20100629, 2 paired valves, 2 separate valves; CASIZ 184502, 3 paired valves; USNM (1149245), 2 paired valves, 2 separate valves. Etymology. Named in honor of Isabella M. A. Rocha from Santa Barbara, California, a close friend of the junior author. Comparisons. Tucetona isabellae differs from Tucetona bicolor Reeve, 1843 (Figures 1 H–J), which has a subtrigonal shell shape, about 39 radial ribs with moderately shallow, very narrow interspaces, with very fine, very closely spaced commarginal ribs, and a moderately wide, curved hinge plate. Tucetona multicostata G. B. S ow e r b y I, 1833 (Figures 1 K–M) has a subovate shell shape, about 32 non-bifurcate radial ribs with wide, deep interspaces, with moderately spaced commarginal ribs, and a moderately wide, curved hinge plate. Tucetona isabellae differs from Tucetona strigilata G. B. Sowerby I, 1833 (Figures 1 N–P), which has a subtrigonal shell shape, about 24 non-bifurcate radial ribs with moderately wide, moderately shallow interspaces, with very fine, closely spaced commarginal ribs, and a wide hinge plate with curved teeth. The North Atlantic Tucetona pectinata (Gmelin, 1791) has fewer, non-bifurcating radial ribs with narrow interspaces when compared to T. isabellae. The new species has a similar number of radial ribs when compared to the northern Atlantic Tucetona subtilis Nicol, 1956, but the ribs are not bifurcate, and the latter species has fewer teeth on the hinge plate. Remarks. Tucetona isabellae has also been found in the fossil record although never formally described (Bramkamp, 1935; Powell, 1986). Powell (1986) compares this species to two fossil species from Venezuela and Columbia, both of which have significant differences in dentition and ligamental grooves, and thus are not included in the comparisons above. We have done a close examination of the Panamic members of the genus Tucetona and found that it has been difficult to differentiate the species. Many of the specimens in the museum collections we examined were incorrectly identified due to a misunderstanding of important characters within the genus. We found that the most distinct differences between the different Panamic species were, 1) presence or absence of rib bifurcation, 2) width and depth of interspaces, 3) size of the commarginal ribs, and 4) the width of the hinge plate. These characters alone can still sometimes lead to incorrect identifications. Further study, using molecular tools, likely would produce additional characters and might lead to the discovery of additional new species.Published as part of Valentich-Scott, Paul & Garfinkle, Elizabeth A. R., 2011, A new species of Tucetona (Bivalvia: Glycymerididae) from Mexico, pp. 65-68 in Zootaxa 2769 on pages 65-67, DOI: 10.5281/zenodo.27686
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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