1,721,049 research outputs found
FIG. 1 in Genetic diversity of Malagasy baobabs: implications for conservation
No full textFIG. 1. — Flowers of the six species of baobabs endemic to Madagascar: A, Adansonia grandidieri Baill.; B, A. madagascariensis Baill.; C, A. perrieri Capuron; D, A. rubrostipa Jum. & H. Perrier; E, A. suarezensis H. Perrier; F, A. za Baill. Photographs by David A. Baum and Nisa Karimi.Published as part of Karimi, Nisa, Grover, Corrinne E., Gallagher, Joseph P., Conover, Justin L., Miller, Emma R., Wendel, Jonathan F. & Baum, David A., 2022, Genetic diversity of Malagasy baobabs: implications for conservation, pp. 37-47 in Adansonia (3) 44 (6) on page 39, DOI: 10.5252/adansonia2022v44a6, http://zenodo.org/record/622517
FIG. 4 in Genetic diversity of Malagasy baobabs: implications for conservation
No full textFIG. 4. — Observed nucleotide diversity PI (π) for the six Adansonia L. species endemic to Madagascar. Northern and southern populations of A. za Baill. are combined here. When distinguishing between geographic populations of A. za, nucleotide diversity was the same as combined for southern populations (π = 0.0029), but less for northern populations (π = 0.0026).Published as part of Karimi, Nisa, Grover, Corrinne E., Gallagher, Joseph P., Conover, Justin L., Miller, Emma R., Wendel, Jonathan F. & Baum, David A., 2022, Genetic diversity of Malagasy baobabs: implications for conservation, pp. 37-47 in Adansonia (3) 44 (6) on page 43, DOI: 10.5252/adansonia2022v44a6, http://zenodo.org/record/622517
Molecular insights into speciation in the genus Gossypium L. (Malvaceae)
Full text linkGossypium tomentosum is the only member of the cotton genus endemic to the Hawaiian archipelago. It is morphologically distinct from other allopolyploid Gossypium species, and its phylogenetic relationships with them are uncertain. Chloroplast and ribosomal DNA restriction site variation were used to estimate the phylogeny of the allopolyploids. Gossypium mustelinum is resolved as sister to the remaining allopolyploid species, which include two species-pairs, G. barbadense - G. darwinii and G. hirsutum (including G. lanceolatum) - G. tomentosum. This indication that G. tomentosum is sister to G. hirsutum is supported by allozyme data. Gossypium tomentosum is proposed, based on biogeographic evidence and molecular data, to have originated by trans-oceanic dispersal from a Mesoamerican progenitor. Few restriction site variants were observed among the allopolyploids, suggesting that present lineages diverged relatively rapidly following polyploidization. Allozyme analysis of 30 G. tomentosum accessions collected from seven islands revealed relatively low levels of genetic diversity: 11 of 50 loci were polymorphic, mean number of alleles per locus was 1.24, and mean panmictic heterozygosity was 0.033. Little geographic patterning of allelic distributions was observed. Despite historical cultivation of G. barbadense and G. hirsutum in Hawaii and the existence of their naturalized derivatives, no allozyme evidence of interspecific introgression into G. tomentosum was detected
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
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