1,721,787 research outputs found
Characterization of metamict structures by electron diffraction and microscopy
Full text linkThesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.Includes bibliographical references (leaves 222-239).by Lu-Chang Qin.Sc.D
Asarum ampulliflorum (Aristolochiaceae), a new species from Taiwan
No full textLu, Chang-Tse, Wang, Jenn-Che (2014): Asarum ampulliflorum (Aristolochiaceae), a new species from Taiwan. Phytotaxa 184 (1): 46-52, DOI: 10.11646/phytotaxa.184.1.5, URL: http://dx.doi.org/10.11646/phytotaxa.184.1.
FIGURE 2 in Asarum ampulliflorum (Aristolochiaceae), a new species from Taiwan
No full textFIGURE 2. Geographical distribution of Asarum ampulliflorum C.–T. Lu & J.–C. Wang, A. asaroides Morr. et Decne., A. macranthum Hooker f., and A. satsumense F. Maekawa.Published as part of Lu, Chang-Tse & Wang, Jenn-Che, 2014, Asarum ampulliflorum (Aristolochiaceae), a new species from Taiwan, pp. 46-52 in Phytotaxa 184 (1) on page 49, DOI: 10.11646/phytotaxa.184.1.5, http://zenodo.org/record/514647
Interactions between glutamate, GABA, acetylcholine and histamine in the periaqueductal gray's control of vocalization in the squirrel monkey
No full textGenetic Diversity of European and Chinese Oilseed Brassica rapa Cultivars from Different Breeding Periods
No full textThe Brassica oilseed crops went through two major breeding bottlenecks during the introgression of genes for zero erucic acid and low glucosinolate content, respectively, which may lead to reduced genetic biodiversity of the crop. This study investigates the impact of these bottlenecks on the genetic diversity within and across European and Chinese winter B. rapa cultivars. We compared eight cultivars from Europe and China, representing three different seed qualities from three different breeding periods: (I) high erucic acid, high glucosinolates (++); (2) zero erucic acid, high glucosinolates (0+); (3) zero erucic acid, low glucosonolates (00, canola quality). Diversity was estimated on 32 plants per cultivar, with 16 simple sequence repeat (SSR) markers covering each of the B. rapa linkage groups. The analysis of molecular variance (AMOVA) showed that genetic variations within cultivars, across cultivars and across regions (Europe and China) were significant, with about 60% of the total variation within cultivars. There was a slight, but non-significant loss in genetic diversity within cultivars when comparing the three breeding periods as indicated by effective number of alleles (2.39, 2.23, and 1.99 for breeding periods 1, 2, and 3, respectively), Shannon information index (0.93, 0.90, 0.75), and expected heterozygosity (0.51, 0.49, 0.42). By cluster analysis (UPGMA dendrograrn) and principal coordinate analysis, Chinese and European cultivars were clearly divided into two distinct groups. In conclusion, quality improvement did not significantly reduce the genetic diversity of European and Chinese B. rapa cultivars.Ministry of Education of P. R. China; German Academic Exchange Service
FIGURE 1. Asarum ampulliflorum C.–T in Asarum ampulliflorum (Aristolochiaceae), a new species from Taiwan
No full textFIGURE 1. Asarum ampulliflorum C.–T. Lu & J.–C. Wang (from holotype). A. Habit. B. Apical view of flower. C. Longitudinally dissected flower. D. Outer whorl stamens. E. Inner whorl stamens. F. Style and stigma. G. Dissected ovary. (drawn by C.–T. Lu)Published as part of Lu, Chang-Tse & Wang, Jenn-Che, 2014, Asarum ampulliflorum (Aristolochiaceae), a new species from Taiwan, pp. 46-52 in Phytotaxa 184 (1) on page 48, DOI: 10.11646/phytotaxa.184.1.5, http://zenodo.org/record/514647
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
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