1,720,964 research outputs found
Frog Gonad as bio-indicator of Sarno River Health
No full textThe Sarno River is affected by an extreme environmental degradation as a result of uncontrolled agricultural activities and the outflow of industrial waste. Changes in the abundance indexes and biodiversity of frogs can be used as a measuring tool to determine water quality of the Sarno River. The aim of this study is to demonstrate the potential in using frog tissue as environmental indicators and to monitor changes in water quality of local streams in the development area of Sarno River. Thus, many samples are collected from sedi-ment, water and frogs for metals analysis. To identify any differentiations of bioaccumulation of metals we have been analyzed skin and gonad of the more representative frog specie along the Sarno river, the barcoded Pelophylax bergeri. Results show that the degree of pol-lution in the Sarno river varies by zone, as well as by metal to metal, with contents that often are very elevated in frogs and higher in water than sediment. The concentrations of heavy metals, especially Arsenic (As) Chromium (Cr) and Zinc (Zn) were found higher in testis than skin of the collected frogs. Therefore, our results sustain the important role of frog gonads as a good bio-indicator of pollution. Frogs, Pelo-phylax bergeri, and water of Sarno River are very contaminated by arsenic and need to be urgently remediated
HARBOUR BIOSECURITY: FOULING SYSTEMATIC DETERMINATION AND REPRODUCTIVE HEALTH ASSESSMENT
No full textBiological invasions and chemical pollution are increasingly recognized key problems for the conservation of biological diversity. To plan species risk assessment, taxonomic species and mode of settlement and the role of temporal-seasonal factors of the fouling have been examined in the harbour of Naples (Italy). Each sample was subjected to systematic determination after fixing and microscopic observation and/or barcoding for biosecurity management of biological pollution. Our data, obtained monthly from artificial panels of Conatex immersed at different depths (from the surface up to three meters deep) showed up to now a total of 17 native species: two algal and fifteen invertebrate species, with Tunicates and Bryozoans more abundant. On the panels resulted that the specific biodiversity is not influenced by seasonality and depths; the settled biomasses is influenced by depth; a climax facies, is represented mainly by Mytilus galloprovincialis, after twelve months. Genomic DNA, using mobility shift and tunel assay, and metals detection were evaluated in gonads and/ or gametes showing fragmentation and apoptosis when arsenic, aluminum and iron increases. More information like diversity, dominance and similarity index processed with cluster analysis and statistical approach could be, in the next future, very useful for biodiversity monitoring security using the benthic communities as an early warning of biological and chemical pollution damage
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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