1,720,994 research outputs found
Percorsi didattici di un Museo Universitario di Scienze della Terra:Gemma 1786. Corso di formazione per insegnanti, a.s. 2007-2008, Civico Museo di Scienze Naturali di Voghera, Pavia, 13 dicembre 2007
No full textLa Geologia è una Scienza che coniuga problemi e interessi disciplinari assai diversi. L’esperienza didattica maturata attraverso l’attività del Museo Universitario “Gemma 1786” è nata con lo scopo di contribuire in modo concreto alla divulgazione delle Scienze della Terra attraverso, sia la valorizzazione del patrimonio scientifico e culturale conservato in detto museo, sia la diffusione della conoscenza del territorio in cui viviamo. Le esperienze didattiche raccolte dal 2004 a “Gemma 1786” sono state il contributo didattico ed educativo fornito al corso di aggiornamento rivolto agli insegnanti di ogni ordine e grado, organizzato dal Museo di Scienze Naturali di Voghera con il patrocinio del CSA di Pavia e di Alessandria
A highly conserved sequence on the short arm of chromosome 7 detects multiple polymorphisms.
No full textWe have isolated a human DNA fragment (laboratory acronym G98) that detects related sequences in mammals, chicken and Drosophila DNAs. This sequence has been mapped to human chromosome 7 p14-p15 by in situ hybridization. Probe G98 recognizes an insertion-deletion type polymorphism, with allelic frequencies of about 0.5, which can be detected with at least six different restriction enzymes. A second polymorphism, which can be detected in human DNA digested with TaqI, is in non-complete linkage disequilibrium with the first polymorphism. About 70% of the individuals analysed have been found to be heterozygous at this locus
Isolation and characterization of a family of sequences dispersed on the human X chromosome.
No full textDuring a systematic search for X-specific sequences we isolated a DNA fragment (called G1.3) that hybridizes to six further homologous X-specific genomic fragments that map to at least four different regions of the human X chromosome. Genomic segments of 11–30 kb (called G1.3 a, b, c, d, and e or DNF22S1 to DNF22S5) have been subsequently cloned for five of the seven repetitions and characterized by restriction mapping. Single-copy sequences have been used to analyze homology between cloned repetitions, to confirm X specificity, and to regionally localize the repetitions. Sequence homology between members of this family seems to be very high (80–90%) and to extend over at least 5 to 12 kb. In situ hybridization and Southern blotting experiments with a panel of human-rodent hybrid cell lines demonstrated that four of the cloned sequences map to three different regions within Xp21.2-pter and the fifth one (G1.3c) maps to Xq28. The family is present with the same complexity and X specificity in macaques (20–30 × 106 years divergence with man), whereas no related sequences were detected in the mouse. To our knowledge small families of dispersed chromosome-specific sequences have been described only for the human Y chromosome. The possible functional or evolutionary significance of this family is discussed
Evidence of microbial activity in a Miocene whale carcass from shallow water sediments (Voghera, Northern 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
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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