1,720,971 research outputs found
J. Gentilli, A geography of climate
No full textBlanchet Guy. J. Gentilli, A geography of climate. In: Revue de géographie de Lyon, vol. 34, n°4, 1959. pp. 387-388
The karyology of Vipera aspis, V. atra, V. hugyi, and Cerastes vipera.
No full textIn the current paper we show the results obtained using standard and banding staining methods (Ag-NOR-, CMA3-,
C-banding and sequential colorations (or Alu I digestions) + CMA3 + DAPI) in specimens of Cerastes vipera, Vipera
aspis, V. atra, and V. hugyi. Cerastes vipera presented chromosomal characters, primitive in snakes, as a karyotype of 2n =
36 chromosomes, with 16 biarmed macrochromosomes and 20 microchromosomes, NORs on one microchromosome pair
and absence of cytologically evident sex chromosomes, at least with the methods used. The three taxa of Vipera studied
showed chromosomal characters either derived, or primitive or at an initial stage of differentiation. All three species showed
a karyotype (derived) of 2n = 42 chromosomes with 22 macro- and 20 micro-chromosomes; they all showed NORs on one
micro-chromosome pair and presented Z and W chromosomes at an initial stage of differentiation. Sexchromosomes Z and
W, were in fact homomorphic, but the former was near all euchromatic, while the W chromosome was almost completely
heterochromatic. All the three taxa of Vipera resulted, however, karyologically diversified, mainly due to the number of
macro-chromosomes pairs with a centromeric, CMA3 positive heterochromatin: almost all the pairs in V. aspis, two pairs in
V. atra and absent in V. hugyi
Discrimination of toad calls by smooth newts: support for the heterospecific attraction hypothesis
No full textThe 'heterospecific attraction hypothesis' (HAH) has been proposed to describe interactions between migrant and resident birds where migrants may indirectly select habitats using the presence/absence of residents. This hypothesis might be extended to other taxa, such as amphibians, which migrate yearly to breeding sites, sharing them with other species. However, the ability of amphibians to be cue-users is not quite obvious as for birds, and must be assessed first. Therefore, in this study we investigated how smooth newts, Lissotriton vulgaris, oriented facing two known species (the common toad, Bufo bufo, and the green toad, Pseudoepidalea viridis) and whether they oriented preferentially towards the calls of species that indicate the more suitable pond for breeding (B. bufo). Newts showed positive phonotactic responses for both species but clearly oriented towards B. bufo when the playbacks of the two toads were presented simultaneously. Our results support the idea that the 'HAH' might be extended to other taxa than birds
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
Trame e ritratti: il motivo del ritratto tra Sette e Ottocento
No full textIl motivo del ritratto come espediente e motore dell'intreccio del romanzo francese del Settecento crea una tradizione che dalla "Princesse de Clèves" giunge fino al primo Balzac
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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