1,721,021 research outputs found
Lacerta bilineata (Reptilia, Lacertidae) as a host of Ixodes ricinus (Acari, Ixodidae) in a protected area of northern Italy
No full textA survey on the importance of Lacerta bilineata as host of Ixodes ricinus was conducted in Northern Italy over a three-year period. A total of 202 western green lizards were captured and a total of 2349 ticks were collected. All ticks were identified as I. ricinus; 53.2% and 46.7% were at the larval and nymphal stages, respectively. Tick number and prevalence were higher in males than in females, especially from April to June during the host breeding period. The level of tick infestation increased with lizard age and size. The number of ticks collected on adult lizards peaked in June and in August. Infestation levels appear to be related to lizard activity patterns and behaviour. Tick number and prevalence also varied in relation to host habitat, infestation being higher in lizards from areas with hard vegetation cover
A preliminary comparative study of immunological, DNA and microscopic techniques for the species identification of archaeological cremated bone
No full textDetermining the species of origin of cremated fragments of bone and of bone artifacts may be difficult even with modem DNA and protein analysis; the question arises as to whether morphological and metric analyses of the histological structure of burnt bone and artifacts may in some cases be a valid alternative to biomolecular techniques.
We conducted a comparative study between histological, immunological and DNA techniques on degraded and cremated bone samples from Grotta Cappuccini (Neolithic site near Lecce), Pescarzo (Iron Age site near Bergamo), Arsago Seprio and Sesto Calende (prehistiric Golasecca culture site) and bone artifacts from funerary beds found at the Roman site of S. Lorenzo, Cremona. Adequate positive and negative controls had previously been tested.
Samples were extracted and tested in order to verify the specific osteon pattern and metrics (with NIH imaging software), survival of the serum protein albumin (by ELISA), and survival of region V of human mitochondrial DNA (by PCR).
We also performed a comparative histological study between burnt and non-burnt bone from different species. Results show how in all cases the histological structure was able to indicate (with different ranges of error according to the species) the species of origin, whereas both protein and DNA analysis gave negative results, suggesting that older histological techniques, accompanied by new metric and statistical analyses, may still be of some use in determining the species origin of burnt fragments of bone
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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