1,721,036 research outputs found
Pharmacognostic characterization of Diplotaxis tenuifolia (Brassicaceae) from Campania and Sicily (Southern Italy)
No full textDiplotaxis tenuifolia (L.) DC., known as perennial wall-rocket, and called “rucola selvatica” in Italy, is a herbaceous plant traditionally used in the Mediterranean area mainly as a wild salad, but also appreciated for its beneficial properties.
Leaves have in fact notable nutritional properties related to the richness in glucosinolates and antioxidant compounds, such as vitamin C and phenolic compounds. Some uses have been reported in the traditional medicine of Southern Italy, such as a laxative, for the treatment of liver problems and as an aphrodisiac, but also as a diuretic, and against myalgia and dental problems. In addition, a cosmetic use to promote hair growth has been referred for Sardinia, and the species has also been cited for its mucolytic properties.
However, to date there is a paucity of studies on the potential medicinal properties of this species, which could pave the way for new nutraceutical and phytotherapeutic applications. Therefore, the aim of our study was to analyse the anatomical and micromorphological features of the leaves of the plant and evaluate the phytochemical profile and the antioxidant activity of a hydroalcoholic extract obtained from leaves of two populations, growing in Campania (DtC) and in Sicily (DtS), respectively
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
Seed morphology data for Orchis canariensis and Orchis patens
No full textDataset of seed mesures for Orchis canariensis and Orchis patens used in the publication:
"SEED MICROMORPHOLOGY SUPPORTS SPECIES DELIMITATION OF ORCHIS CANARIENSIS (ORCHIDACEAE), AN ENDEMIC ORCHID FROM CANARY ISLANDS" - Nature Conservation Research
By Jacopo Calevo, Miriam Bazzicalupo, Cristina González-Montelongo, Daniel Rodríguez González, Laura Cornara
Abstract:
Geographic isolation is one of the primary drivers of speciation, but islands remain a reservoir of overlooked and understudied endemic species. In this study, we collected seed micromorphological data from Orchis canariensis (Orchidaceae), a declining species occurring only in Canary Islands (Spain), whose taxonomy was debated in the past decades. The aim of the study was to detect seed micromorphological traits in support of species delimitation by means of light and scanning electron microscopy. Seeds from a population in Tenerife resulted to be clavate with a cell number in the longitudinal axis varying from five to seven. Seeds showed straight to sinuous anticlinal walls and no ornamentations in the periclinal walls. Average seed length was 313.66 ± 44.78 µm and average width 184.31 ± 30.26 µm, with a ratio of 1.72 ± 0.25, while embryo length and width were 157.18 ± 35.21 µm and 125.43 ± 25.92 µm respectively. However, despite the affinities with the sister species, Orchis patens, quantitative and qualitative seed traits supported species delimitation recently proposed by means of molecular biology. Taken together, our results confirmed the importance of seed micromorphology in support of taxonomical studies
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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