1,720,973 research outputs found
I campioni dello zoologo Daniele Rosa nel Museo di Zoologia e Anatomia Comparata dell’Università di Modena e Reggio Emilia
Full text linkNell’ambito del progetto “La cause dell’evoluzione”, realizzato presso l’Università di Modena e Reggio Emilia e volto alla digitalizzazione della produzione scientifica e del materiale raccolto dallo zoologo Daniele Rosa, è stata condotta la ricognizione delle collezioni del Museo di Zoologia e Anatomia Comparata dell’Ateneo modenese al fine di verificare la presenza dei campioni che Daniele Rosa riportava come depositati in Museo, ma dei quali si erano perse le tracce dall’inizio del Novecento. La ricognizione ha permesso di identificare 19 campioni di oligocheti studiati da Rosa, che portano ancora il cartellino originale autografo di Rosa. Tra essi è presente un esemplare della specie Allolobophora cuginii, che Rosa descrisse nel 1905 e che rappresenta l’olotipo di questa specie. Tra i campioni è presente anche un esemplare di Allolobophora minuscula, che po- trebbe rappresentare un secondo olotipo di Rosa, ma l’assenza di dati di inventario rende al momento non certa questa attribuzione.The project “The causes of evolution”, carried out at the University of Modena and Reggio Emilia and aimed at the digitization of the specimens and the scientific production of the zoologist Daniele Rosa, included a survey of the historical collections of the Museum of Zoology and Comparative Anatomy looking for oligochaete samples collected by the zoologist Daniele Rosa and deposited at the Museum. The survey allowed the identification of 19 samples of the oligochaetes studied by Daniele Rosa still carrying the original labelling handwritten by Rosa. Among samples, we find specimens of the species Allolobophora cuginii, that Rosa described in 1905 for the first time and that represent the holotype of that species. We also find specimens of the species Allolobophora minuscula, that could represent a second Rosa’s holotype, but the absence of inventory date and number makes this attribution at present uncertain
Figure 4 in Combined-data phylogenetics and character evolution of Clitellata (Annelida) using 18S rDNA and morphology
No full textFigure 4. Parsimony consensus tree of the combined (18S rDNA, somatic, and spermatozoal) data set. Bootstrap frequencies ± 50% are indicated above the branches.Published as part of Marotta, Roberto, Ferraguti, Marco, Erséus, Christer & Gustavsson, Lena M., 2008, Combined-data phylogenetics and character evolution of Clitellata (Annelida) using 18S rDNA and morphology, pp. 1-26 in Zoological Journal of the Linnean Society 154 (1) on page 10, DOI: 10.1111/j.1096-3642.2008.00408.x, http://zenodo.org/record/544641
Figure 5 in Combined-data phylogenetics and character evolution of Clitellata (Annelida) using 18S rDNA and morphology
No full textFigure 5. Phylogenetic tree obtained from one of the three replicate Bayesian inference runs of the combined (18S rDNA, somatic, and spermatozoal) data set. Posterior probabilities ± 0.85 are indicated in front of the nodes.Published as part of Marotta, Roberto, Ferraguti, Marco, Erséus, Christer & Gustavsson, Lena M., 2008, Combined-data phylogenetics and character evolution of Clitellata (Annelida) using 18S rDNA and morphology, pp. 1-26 in Zoological Journal of the Linnean Society 154 (1) on page 11, DOI: 10.1111/j.1096-3642.2008.00408.x, http://zenodo.org/record/544641
Reproductive organs and spermatogenesis of the peculiar spermatozoa of the genus Kryptodasys (Gastrotricha, Macrodasyida), with an appraisal of the occurrence and origin of the tail‐less spermatozoa in Gastrotricha
Full text linkThe presence of aflagellate spermatozoa in two species of Kryptodasys (Fam. Macrodasyidae), a gastrotrich genus recently described, is reported. Their ultrastructure shows common features, which appear peculiar to the genus and different from those of male gametes of the phylogenetically unrelated Dolichodasys (Fam. Cephalodasyidae), the only other macrodasyidan genus known to have aflagellate sperm. Additional information on the ultrastructure of the genital apparatus of the two Kryptodasys species is given, which confirm the data of the originals description and the systematic delimitation of this new genus from Macrodasys, which was mainly based on the structure of the reproductive system until now. The functional and phylogenetic significance of the aflagellate condition of spermatozoa in the two taxa
under study and in other species is discussed also in the light of the generally flagellate condition of functional sperm in Gastrotricha
Figure 3. Phylogenetic trees obtained from morphological data. A in Combined-data phylogenetics and character evolution of Clitellata (Annelida) using 18S rDNA and morphology
No full textFigure 3. Phylogenetic trees obtained from morphological data. A, phylogenetic tree obtained from one of the three replicate Bayesian inference runs of the somatic data set. Posterior probabilities of ± 0.85 are indicated in front of the nodes. B, phylogenetic tree obtained from one of the three replicate Bayesian inference runs of the spermatozoal data set. Posterior probabilities ± 0.85 are indicated in front of the nodes.Published as part of Marotta, Roberto, Ferraguti, Marco, Erséus, Christer & Gustavsson, Lena M., 2008, Combined-data phylogenetics and character evolution of Clitellata (Annelida) using 18S rDNA and morphology, pp. 1-26 in Zoological Journal of the Linnean Society 154 (1) on page 9, DOI: 10.1111/j.1096-3642.2008.00408.x, http://zenodo.org/record/544641
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
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