1,721,047 research outputs found
Erratum: Bouman, R.W., Keβler, P.J.A., Telford, I.R.H., Bruhl, J.J., Strijk, J.S., Saunders, R.M.K., Esser, H.-J., Falcón-Hidalgo, B. & van Welzen, P.C. (2022) A revised phylogenetic classification of tribe Phyllantheae (Phyllanthaceae). Phytotaxa 540: 1-100
Full text linkBouman, R.W., Telford, I.R.H., Bruhl, J.J., Strijk, J.S., Saunders, R.M.K., Esser, H.-J., Falcón-Hidalgo, B., Welzen, P.C. (2023): Erratum: Bouman, R.W., Keβler, P.J.A., Telford, I.R.H., Bruhl, J.J., Strijk, J.S., Saunders, R.M.K., Esser, H.-J., Falcón-Hidalgo, B. & van Welzen, P.C. (2022) A revised phylogenetic classification of tribe Phyllantheae (Phyllanthaceae). Phytotaxa 540: 1-100. Phytotaxa 597 (3): 237-241, DOI: https://doi.org/10.11646/phytotaxa.597.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.597.3.
Taxonomy, systematics, and biogeography of Ficus subsection Urostigma (Moraceae)
Full text linkFive research methods were used in Taxonomy, Systematics, and Biogeography of Ficus subsection Urostigma(Moraceae); Morphological characters, leaf anatomy, pollen morphology, molecular phylogeny, and historical biogeography. Seven topics are the result: 1) A revision was made based on morphology in which 27 species are recognized, but which also showed that morphology alone cannot solve all problems because of variation within the species. 2) Leaf anatomy displayed less variation in characters and anatomical characters proved to be useful for the classification of Ficus, especially in combination with morphology. 3) Pollen morphology appeared to be similar for all species and the characters can merely be used for generic recognition. 4) A new classification for subsection Urostigma is proposed in which the circumscription of the subsection and the species is the result of combining molecular phylogenetic information with morphology and leaf anatomy. 5) Ficus cornelisiana, a new species from Sino-Himalayan, was reported based on morphological and leaf anatomical evidence. 6) The historical biogeography was studied by using molecular dating and ancestral area reconstruction. 7) The use of some Thai species within subsect. Urostigma is reported, six of them are used as food, as ornamental, or the uses are related to religion or sacred purposes.UBL - phd migration 201
Systematics and biogeography of Aganope, Brachypterum and Derris (Fabaceae) in Asia
Full text linkDerris Lour. (family Fabaceae/tribe Millettieae) is a quite well-known legume genus as many species are a source of Rotenone toxin, a commercial organic insecticide and fish poison used in many countries. The genus is characterized mainly by its indehiscent, flat, thin but leathery pods with usually wing(s) along the suture(s). In the tribe Millettieae, however, there are several plants in the tropical areas of the old and new world which have similar pods and other morphological characters comparable to Derris. They all are called Derris-like taxa (or Derris-like plants) in this thesis. In the course of time, different generic circumscriptions of these plants were proposed by various taxonomists. The main objectives of this thesis are to clarify the relationships between species and genera within this complex group of Derris-like taxa [mainly focused on the old-world Asian genera: Aganope, Brachypterum and Derris (+Paraderris)] and to provide a new classification which reflects the evolutionary and biogeographic relationships of these plants.Naturalis Biodiversity Center and Royal Thai GovernmentUBL - phd migration 201
Phylogenetic and taxonomic studies in Macaranga, Mallotus and other acalyphoid genera (Euphorbiaceae s.s.)
Full text linkThe general goal of this PhD research was to study the phylogeny and systematics of selected plant genera in the subfamily Acalyphoideae s.s. of the angiosperm family Euphorbiaceae. The main focus was on two large genera, Macaranga and Mallotus, and a number of smaller genera related to them. The phylogeny of these genera was studied using sequence data from plastid (trnL-F) and nuclear (ITS, ncpGS, phyC) markers. The results show that Macaranga is a monophyletic genus, but that Mallotus is paraphyletic for two reasons: 1) Mallotus sections Hancea and Oliganthae form a separate clade together with the genera Cordemoya and Deuteromallotus, and 2) the genera Coccoceras, Neotrewia, Octospermum and Trewia are part of the main Mallotus clade. To reflect these findings in the classifications, Neotrewia, Octospermum and Trewia were merged with Mallotus (the other necessary taxonomic rearrangements have been conducted separately). A taxonomic revision for these three genera was also conducted. Further, the phylogeny of the main Mallotus clade was studied in more details using both molecular (matK, gpd) and morphological data. Additionally, a taxonomic revision of the Malesian species in the genus Cleidion was conducted, and the morphology and phylogenetic position of previously insufficiently known African genus Afrotrewia was studied.This study was financially supported by Finnish Cultural Foundation (Suomen Kulttuurirahasto) and Leids Universiteits Fonds.UBL - phd migration 201
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
The rise and fall of Sauropus (Phyllanthaceae) : a molecular phylogenetic analysis of Sauropus and allies
Full text linkMolecular phylogenetic studies focused on the genus Phyllanthus L. (Phyllanthaceae) showed that Sauropus Blume (including Synostemon F.Muell.) and its related genera Breynia J.R.Forst. & G.Forst. and Glochidion J.R.Forst. & G.Forst. should be united with Phyllanthus to create a monophyletic genus. The relationships within Sauropus and its relationship with Breynia were studied to test/corroborate such a broad definition of Phyllanthus. The molecular phylogenetic analyses show that Sauropus in the broad sense is composed of two distinct groups, the former Australian Synostemon and the Southeast Asian Sauropus in the strict sense with the monophyletic Breynia embedded in the latter. As the phylogeny of the species rich Phyllanthus is still far from completed and the results here strongly support the distinction of monophyletic groups such as Glochidion, former Synostemon, and Sauropus/Breynia. These genera are recognisable, while union with Phyllanthus (suggested by Hoffmann and co-authors in 2006) will turn the latter into an unrecognisable monolithic giant of a genus. It is a much better strategy to use the complete phylogeny of Phyllanthus to render it into smaller, monophyletic genera that can be characterized. The present study shows Synostemon has to be recognised again on generic level. Breynia, the older name, is nested within Sauropus, leading us to transfer the latter to Breynia. Within this broadened Breynia, two subgenera and two sections are distinguished, subgenus Sauropus and subgenus Breynia with section Cryptogynium and section Breynia under the latter.Agricultural Research Development Agency (Public Organization), ThailandUBL - phd migration 201
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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