1,720,957 research outputs found
A taxonomic revision of the Siler montanum group (Apiaceae) in Italy and the Balkan Peninsula
Full text linkAbstract: A morphometric-based taxonomic revision of the Siler montanum group (Apiaceae) from Italy and the Balkan Peninsula was carried out. Multivariate and univariate analyses were performed on 47 morphological characters including seven ratios, and based on the study of 328 dried herbarium specimens. According to our results, the characters employed in the study revealed their suitability as key characters for the examined taxa. A taxonomic treatment was presented and a new diagnostic key to the S. montanum group is also provided for Italy and Balkan Peninsula. Ten taxa were recognized within the group, and among them three new subspecies were described: S. montanum subsp. apuanum, S. montanum subsp. corrasianum and S. montanum subsp. ogliastrinum. Furthermore, three new combinations were proposed: S. zernyi subsp. laeve, S. zernyi subsp. ochridanum and S. montanum subsp. stabianum. Six names were lectotypified: Laserpitium garganicum var. balcanicum, L. garganicum var. laeve, L. garganicum var. scabrum, L. siculum var. stabianum, L. siler var. ovalifolium and Ligusticum garganicum. Occurrences were confirmed for Siler zernyi subsp. zernyi in Greece and S. zernyi subsp. laeve in North Macedonia. Occurrences were excluded for S. montanum subsp. garganicum in Greece and North Macedonia and S. montanum subsp. siculum in C and S Italy. Citation: Conti F., Bartolucci F., Bacchetta G., Pennesi R., Lakušić D. & Niketić M. 2021: A taxonomic revision of the Siler montanum group (Apiaceae) in Italy and the Balkan Peninsula.-Willdenowia 51: 321-347. Version of record first published online on 16 November 2021 ahead of inclusion in December 2021 issue
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Chemical profiling of six Stachys taxa from Balkan Peninsula
No full textAim of this work was the chemical profiling of six Stachys taxa from Balkan Peninsula: S. recta subsp. nitens, S. atherocalyx, S. beckeana, S. zepcensis (all four belonging to S. recta group), S. alpina subsp. dinarica and S. plumosa. Dry ethanol extracts of aerial flowering plant parts were qualitatively and quantitatively characterized for their phenolic composition using the HPLC-DAD-ESI-MS technique. In total, 44 phenolic compounds were detected, belonging to three main classes of constituents: phenolic acids, phenylethanol glycosides (PhGs) and flavonoids. Chlorogenic acid was the main phenolic acid in all samples. Regarding PhGs, in all investigated extracts acteoside and lavandulifolioside were present. In S. recta group, extracts of S. atherocalyx, S. recta subsp. nitens and S. beckeana showed similar pattern considering phenylethanol glycosides, while S. zepcensis contained only the two aforementioned compounds. PhGs profile of S. plumosa extract comprised the same compounds from S. recta group, but it was also characterized by the presence of few high-molecular compounds. PhGs composition of S. alpina subsp. dinarica extract was somewhat similar with those of S. recta group and also with S. plumosa, but still specific by the presence of echinacoside and leucosceptoside A. The main flavonoids in extracts of Stachys recta group as well as in S. alpina subsp. dinarica extract were 8-hydroxyflavone glycosides (7-O-allosylglucosides of isoscutellarein and hypolaetin and their 4′-methyl derivatives). In addition, in the extract of S. alpina subsp. dinarica two luteolin-7-O-hexosides were also present. On the other hand, S. plumosa extract differed considerably containing mainly derivatives of chrysoeriol and apigenin, while 8-hydroxyflavones (isoscutellarein derivatives) were detected in traces. The results confirmed the importance of flavone 7-O-allosylglucosides at the sectional level of Stachys genus
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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