1,721,002 research outputs found
Bloom estivo di Ceratium hirundinella (O.F.Muller) Berg. (Dinoflagellatae) nel lago di Ledro (Trento).
No full textFirenze (Italy
Growth performance of different rainbow trout(Oncorhynchus mykiss)strains reared in Trentino (Northern Italy)
No full textWe will present some results of an ongoing project aimed at
analysing the major biotic and abiotic factors that influence the
rainbow trout (O. mykiss) productive yield in the Trentino region
(Northern Italy). Five trout strains were compared for their overall
farming performance and suitability to be reared in the local
farms. Eyed-egg samples of different strains were obtained from
local and foreign suppliers. In the first part of the trial, the
strains were compared in terms of egg size, hatching and growth
rates up to the parr stage in a single farm and the intraspecific
genetic variability was assessed using a microsatellites technique
by analysing DNA extracted from random samples of caudal
fin tissue. Significant among-strains differences in growth
performance were found after 8 rearing months. In the second
phase of the trial, parrs of each strain were divided into 4 lots.
Then the lots of the 5 strains were transferred to 4 selected
Trentino trout farms to carry out a performance test up to a market
size of around 0.7 kg. Regardless of the location, all fish lots
were kept at the same density and were fed the same commercial
trout feed, six days a week. Individual weight and length were
measured on random samples of 100 fish per lot every 2 months.
At the same time, major water parameters were registered in the
different farms. Specific growth rate (SGR), thermal growth rate
(TGR), condition factor and feed conversion ratio (FCR) were
calculated. Statistical analyses were performed with SAS and
STATISTICA 9.0. The growth graphs fit quadratic equations and
average daily gain ranged from 1.46 to 1.77 g. Among-strains differences
in growth performance, condition factor, feed conversion
and age at sexual maturity were found at market size
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
Microsatellite-based genetic diversity and admixture history of rainbow trout (Oncorhynchus mykiss – Walbaum, 1792) stocks in Trentino (Italy)
No full textItaly is the first producer of rainbow trout in Europe (EU member) and Trentino farmers represent roughly 8% of this production, but genetic information of the stocks employed is still lacking. This study aimed to estimate the genetic variability of the rainbow trout stocks farmed in Trentino and to reconstruct the related admixture history. Sixty hundred and thirty-two animals belonging to 23 different stocks were analysed using microsatellite loci. Seventeen stocks showed negative values of inbreeding coefficient within population (Fis ranging from -0.06 to -0.107). NJ tree of genetic distances among stocks showed distinct clusters reflecting, at least partially, the information coming from known history. Discriminant analysis of principal components evidenced only 2 main groups of trout whereas model-based cluster analyses could detect 7 genetically distinct groups, underlining an influence from an old commercial Danish stock. Rainbow trout in Trentino showed a recent history of admixture with a lower level of genetic differentiation among stocks when compared to wild populations (FST = 7.7%). The results confirmed the rather similar genetic origin of the analysed populations, highlighting the necessity to carefully manage the stocks to prevent phenomena of inbreeding and, more often, outbreeding depression
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
