1,720,971 research outputs found
Biosistematica vegetale: Characterization of a natural hybrid between orchzs laxiflora lam and o morzo l (orchidaceae)
No full textMolecular characterization of a hybrid zone between O. mascula (L.) L. and O. pauciflora Ten. (Orchidaceae) in Southern Italy.
No full textMolecular characterization of a hybrid zone between O. mascula (L.) L. and O. pauciflora Ten. (Orchidaceae) in Southern Italy.
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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
Impact of barriers on Cyrno‐Sardinian endemisms: A comparative study of population genetics and phylogeography within taxa of Centranthus sect. Nervosae (Caprifoliaceae)
Full text linkThis study explores the impact of geographic barriers on the distribution and survival of Mediterranean endemic species, focusing on Centranthus sect. Nervosae, a tetraploid species complex found in Corsica and Sardinia. The aim is to analyse how these barriers influence genetic diversity, population structure, and phylogeographic pattern, thereby impacting conservation strategies and future resilience of the selected study species.
Genotyping involved biparental markers (16 nuclear microsatellites for the population genetic survey) and Sanger sequencing of uniparental markers (six plastid sequences for the phylogeographic survey). Screening of microsatellites revealed a diploidisation process, and haplotype fixation in plastid sequence was observed across all populations.
Results from both survey methods clearly indicate that isolation and barriers have significantly impacted the genetic structure of populations, subjecting them to genetic drift, bottlenecks and related evolutionary phenomena. Over time, these factors have resulted in the observed low haplotypic variability and nuclear microsatellite diversity.
Reduced genetic variability, combined with factors such as inbreeding and genetic drift, highlight the vulnerability of these populations to extinction. Consequently, this multi-approach survey has contributed to defining conservation strategies, stressing the need to preserve genetic diversity and mitigate the impacts of human activities and environmental changes on endemic plant communities in island-like environments.
The study emphasises the importance of integrating multiple marker types to deepen our understanding of conservation genetics and evolutionary history, thereby contributing to the assessment, and planning of potential safeguarding strategies for such endemic species
Discovering the ethnobotanical traditions of the island of Procida (Campania, southern Italy)
No full textThe aim of this paper is to study at what extent current knowledge on traditional plant uses is still alive on the island of Procida (Campania, southern Italy). Information were collected using interviews on 48 persons native or residents in the island since decades. For each recorded species, scientific name, vernacular name (when available), chorotype, parts used, folk uses, and way of preparation are described. Data was collected on a total number of 92 plant species, belonging to 87 genera and 48 families. In total, 1283 use reports have been recorded: the highest number of use reports has been documented for medicinal uses, followed by food, domestic, cosmetic and veterinary uses. Regarding medicinal uses, the majority of plants are used in the treatment of skin and gastrointestinal diseases and for general health benefits. This survey showed that the custom of using plants is still alive on the island of Procida
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