1,720,965 research outputs found
Validation and morphology of Begonia fagopyrofolia in B. sect. Stolonifera (Begoniaceae) in China
No full textChen, Wen-Hong, Wu, Jian-Yong, Radbouchoom, Sirilak, Shui, Yu-Min (2021): Validation and morphology of Begonia fagopyrofolia in B. sect. Stolonifera (Begoniaceae) in China. Phytotaxa 479 (1): 105-113, DOI: 10.11646/phytotaxa.479.1.8, URL: http://dx.doi.org/10.11646/phytotaxa.479.1.
Begonia nangunheensis, a new species of Begoniaceae from Yunnan province, China
No full textGuo, Shi-Wei, Chen, Wen-Hong, Aung, Aung, Radbouchoom, Sirilak, Zhao, Jin-Chao, Li, Zhi-Hong, Shui, Yu-Min (2021): Begonia nangunheensis, a new species of Begoniaceae from Yunnan province, China. Phytotaxa 480 (2): 201-209, DOI: 10.11646/phytotaxa.480.2.9, URL: http://dx.doi.org/10.11646/phytotaxa.480.2.
FIGURE 2 in Validation and morphology of Begonia fagopyrofolia in B. sect. Stolonifera (Begoniaceae) in China
No full textFIGURE 2. Micromorphology of the leaf epidermis in Begonia cehengensis (A–H) and B. fagopyrofolia (I–P). A–D and I–L. The adaxial surface; E–G and M–P. The abaxial surface; A, D, E, F and I, K, M. Trichomes; B, C, J. The epidermal cells; A, E, G and I, K, L, N, P. Glands; G, H and N, O. Stomata. Note: g. Glands; s. Stomata; p. Tuberulate surface of trichome cells; sm. Smooth surfaces of trichome cells. Scale bar: A, K=300μm; B, J, L, M=100μm; C, D, H O, P=50μm; E, I=500μm; F=20μm; G, N=200μm.Published as part of Chen, Wen-Hong, Wu, Jian-Yong, Radbouchoom, Sirilak & Shui, Yu-Min, 2021, Validation and morphology of Begonia fagopyrofolia in B. sect. Stolonifera (Begoniaceae) in China, pp. 105-113 in Phytotaxa 479 (1) on page 107, DOI: 10.11646/phytotaxa.479.1.8, http://zenodo.org/record/541344
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
Begonia fimbristipula subsp. siamensis (sect. Diploclinium, Begoniaceae), a new taxon of the megadiverse genus endemic to Thailand
No full textThe genus Begonia has not only been recognised to be one of the mega-diverse plant genera but also as one found to comprise many undiscovered species. In particular, the increase of extensive field surveys in tropical regions of Southeast Asia has added to the discovery of many new species that are often found only in a few localities. In this study, the new taxon Begonia fimbristipula subsp. siamensis subsp. nov. from Thailand is described. The Thailand accessions are highly similar in their morphology to accessions of B. fimbristipula from southern China but differ in their tuber shape, peduncle trichomes, petiole trichomes and number of female tepals. The new taxon has been found only in the northern parts of Thailand occurring at elevations above 1,300 meters. The new findings not only contribute to our knowledge of the plant diversity of Thailand but provide also critical information contributing to the protection of this species. In China, this species is endangered which is of special concern given its utilisation as a medical herb in traditional Chinese medicine. Considering IUCN Red List Categories, the new subspecies is considered to be Vulnerable. The disjunct distribution of the two subspecies of B. fimbristipula encourages urgently needed comparative taxonomic studies across the Indo-Burma biodiversity hotspot
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
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
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