1,721,030 research outputs found
Thirty years of editorial activity of the International Foundation pro Herbario Mediterraneo in 30 issues of Flora Mediterranea and Bocconea
No full textThe results of the first 30 years of editorial activity of the International Foundation pro Herbario Mediterraneo through the publication and distribution of the journals Flora Mediterranea and Bocconea are reviewed. They consist of 683 articles and scientific notes on Flora Mediterranea, 664 articles plus 12 monographs on Bocconea. In particular, 125 new spe- cies, 22 subspecies, 4 varieties and 9 nothospecies of vascular plants are reported, mainly from Sicily, Greece, Spain, Turkey, peninsular Italy and Algeria. Furthermore, the indices of the 30 issues of both periodicals and the lists of all the new taxa and nothotaxa published in them are reported: among these a genus of Fungi. The lists of the numerous taxonomic and nomenclatu- ral variations proposed are also presented. Although marginal, a few new syntaxa described are listed. In the review, special attention was given to the karyologycal data published in Flora Mediterranea since the first issue. It concerns 1194 taxa related to the native vascular flora of many Mediterranean countries. Among the most investigated floras, those of Bulgaria, Greece, Turkey, Spain and the Italian Peninsula stand out. The review also examines the data of the first contributions of a second column devoted to plant germination started with volume no. 29 (2019) of Flora Mediterranea. Specific quantitative data by themes, taxonomic groups and geographical areas are reported for the two journals 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
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
Centaurea heywoodiana (Asteraceae), a new species from the Nebrodi Mountains (NE-Sicily)
Full text linkA new endemic species of Centaurea is here described from the Nebrodi Mountains, in Sicily, and named Centaurea heywoodiana. Information on its morphology, distribution, ecology and taxonomic relationship is also provided
Plant landscape and phytodiversity in the archeological area of Segesta (NW Sicily)
Full text linkIn the system of Sicilian archaeological parks, the area of Segesta - an ancient city of western Sicily referring to the Carthaginian eparchy, - represents, together with Selinunte, Erice and Mothia, another integrated hotspot of biodiversity and archeaology. The current plant landscape is strongly influenced by a millenary anthropic transformation. There are no residual expressions of the original plant covering that, with reference to the environmental potential of the area, can be traced back to the evergreen Mediterranean forest dominated by Quercus ilex, presently only sporadically occurring in the area of the ruins, together with other species related to associations and upper syntaxa referable to the class Quercetea ilicis (Olea europaea subsp. sylvestris, Ceratonia siliqua, Pyrus spinosa s.l., Rhamnus alaternus, Chamaerops humilis, Crataegus laevigata, Ruscus aculeatus, Asparagus albus, A. acuti- folius, etc.). Sporadic is the presence of Celtis australis and Ficus carica.
The whole area of Segesta is included in the potential belt of both maquis and Mediterranean ever- green forest, formations once present but progressively replaced with classical Mediterranean tree crops (olive, almond, carob and vines). The abandonment of these crops allowed the advent of grass- lands, sometimes with trees, until the introduction of new plants scattered to further mark the anthropization of the area. Quite widespread in the hill next to the theatre is the garrigue with Chamaerops humilis and Ampelodesnmos mauritanicus, here diversified by the presence of Plumbago europaea which, due to its high degree of coverage, sociability and frequency, is a good unpublished plant association. The whole area is rich in aromatic (Phoeniculm vulgare, Origanum vulgare, Mentha pulegium and M. rotundifolia, Salvia sclarea) and medicinal species (Atractylis gummifera, Hypericum perforatum, H. perfoliatum, Sylibium marianum, Urginea maritima).
Elements of landscape importance in spring-summer are Asphodelus ramosus, some spiny Asteraceae, such as Cynara cardunculus subsp. cardunculus and Onopordum illyricum, and other Apiaceae, as Magydaris tomentosa, Thapsia garganica and the most frequent and expressive Ferula communis.
There are several exotic plants introduced in the last century (Eucalyptus sp. pl., Cupressus sp. pl., Pinus sp. pl.), or naturalized since longer time (Agave americana, Opuntia ficus-indica, Myoporum serratum). The presence of the invasive Ailanthus altissima, widespread even in the most sensitive areas, has negative repercussions on the stability of the already precarious monuments and on the landscape in general, away from the stereotypical images of Segesta.
Some iconographic documents, dating back to the illustrations of the travellers of the Grand Tour, give a representation of the vegetation covering this area before its transformations. It would be advis- able inspiring to this period the actions of landscape restoration to be undertaken in this area
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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