1,720,974 research outputs found
Systematics of Mappia (Icacinaceae), an endemic genus of tropical America
No full textAngulo, Diego F., Stefano, Rodrigo Duno De, Stull, Gregory W. (2013): Systematics of Mappia (Icacinaceae), an endemic genus of tropical America. Phytotaxa 116 (1): 1-18, DOI: 10.11646/phytotaxa.116.1.1, URL: http://dx.doi.org/10.11646/phytotaxa.116.1.
FIGURE 4 in Systematics of Mappia (Icacinaceae), an endemic genus of tropical America
No full textFIGURE 4. Distribution map of the genus Mappia. Mappia longipes (․), M. mexicana (ˑ), M. multifolora (̝), and M. racemosa (●).Published as part of Angulo, Diego F., Stefano, Rodrigo Duno De & Stull, Gregory W., 2013, Systematics of Mappia (Icacinaceae), an endemic genus of tropical America, pp. 1-18 in Phytotaxa 116 (1) on page 9, DOI: 10.11646/phytotaxa.116.1.1, http://zenodo.org/record/507909
FIGURE 6. Mappia multiflora. A in Systematics of Mappia (Icacinaceae), an endemic genus of tropical America
No full textFIGURE 6. Mappia multiflora. A. Flowering branch and detail of domatia in the abaxial surface of leaves. B. Flower. C. Inside of petal. D. Floral dissection (petals removed) showing androecium and gynoecium. E. Gynoecium showing ovary, minute style and disk.Published as part of Angulo, Diego F., Stefano, Rodrigo Duno De & Stull, Gregory W., 2013, Systematics of Mappia (Icacinaceae), an endemic genus of tropical America, pp. 1-18 in Phytotaxa 116 (1) on page 13, DOI: 10.11646/phytotaxa.116.1.1, http://zenodo.org/record/507909
FIGURE 2 in Systematics of Mappia (Icacinaceae), an endemic genus of tropical America
No full textFIGURE 2. The best tree (lnL -8160.768319) from the ML analysis in RAxML (GTR+G) including support from the bootstrap. Only support of 50 percent and above is presented on the tree. The taxa previously included in the Mappia group are highlighted in blue.Published as part of Angulo, Diego F., Stefano, Rodrigo Duno De & Stull, Gregory W., 2013, Systematics of Mappia (Icacinaceae), an endemic genus of tropical America, pp. 1-18 in Phytotaxa 116 (1) on page 6, DOI: 10.11646/phytotaxa.116.1.1, http://zenodo.org/record/507909
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
Mappia Jacquin 1797
No full textMappia Jacquin (1797: 22), nom. cons. Type: Mappia racemosa Jacquin (1797: 22). Shrubs or trees up to 25 m tall. Young branches cylindric, rarely slightly angular, in general all parts puberulent to sericeous-tomentose when young, becoming glabrous with time, hairs simple with two branches more or less the same length (i. e., malpighiaceous hairs). Leaves simple, alternate, exstipulate, membranaceous to subcoriaceous, sometimes clustered at the apex of a young branch, green when dry, rarely turning black; petiole up to 3 cm long, slightly sulcate, flattened, with a nitid abscission line in the base, puberulent to tomentose, especially in the grove; blades narrowly oblanceolate, narrowly obovate, elliptic to narrowly elliptic, puberulent on both sides, turning glabrous with time, with domatia in axils of secondary nerves, rarely absent, glabrous or puberulent abaxially, glabrous adaxially; apex acute or narrowly acuminate, s omet imes e marginated; margi n entire; ba se a ttenua te, rare ly c uneate; ve na tion pe nnine rve d, brochidodromous, main vein conspicuous abaxially, slightly sunken and conspicuous adaxially, 5–13 pairs of secondary nerves, alternate, conspicuous or not, tertiary venation perpendicular to the secondary nerves, conspicuous or not. Inflorescence up to 13 cm long, axillary, cymose, sometimes extensively branching, overall puberulent, sericeous-tomentose to strigose, peduncle up to 9.5 cm long, bracteate at the base of the peduncle, bracts up to 1.5 mm long, concave, triangular, sericeous-tomentose; without bracteoles. Flowers pentamerous, rarely tetra- or heptamerous, actinomorphic, hermaphroditic, articulate at the base. Calyx campanulate, slightly fleshy, puberulent or almost glabrous in the abaxial surface, lobes mucronate to deltoid. Corolla white-yellow, petals free, sericeous or glabrous outside, bearded inside, rarely glabrous; main vein inconspicuous, rarely conspicuous, apex acute, prolonged in a short tip, inflexed; margin slightly swollen apically, slightly papillate. Stamens alternate to petals, free; filament cylindrical, erect; anthers basifixed, dehiscent by longitudinal slits; connective narrowly triangular, prolonged with a short tip. Disk free, encircling base of the ovary, margin with 5 mucronate lobes, hirsute to glabrous outside, glabrous inside. Pistils subglobose, hirsute to glabrous, ovary unilocular, ovules two (only one developed), anatropous, pendent from the apex of the locule; style short; stigma capitate. Fruits subglobose or ellipsoidal drupes, glabrous, apex acute or apiculate; exocarp thin, red when mature; mesocarp slightly fleshy when mature; endocarp hard, smooth. Distribution: —Greater Antilles, Mexico and parts of Central America (Guatemala, Belize, Nicaragua, Costa Rica and possibly Panama).Published as part of Angulo, Diego F., Stefano, Rodrigo Duno De & Stull, Gregory W., 2013, Systematics of Mappia (Icacinaceae), an endemic genus of tropical America, pp. 1-18 in Phytotaxa 116 (1) on page 8, DOI: 10.11646/phytotaxa.116.1.1, http://zenodo.org/record/507909
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
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