1,720,971 research outputs found
The lichens: from atmospheric pollution bioindicators to experimental model in order to define the tumours origin
No full textAccumulation phenomena of noxiuos species in healthy and cancerous target organs
No full textTransworld Research Network Kerala, Indi
Liche-based biosensor for the determination of benzene and 2-chlorophenol: microcalorimetric and amperometric investigations
No full textPreliminary microcalorimetric studies have
been performed to analyse the response of a whole epiphytic
lichen tissue (Evernia prunastri) to 2-chlorophenol
(2Cl-/), a pollutant of oil mill waste-water, in order to
evaluate whether the tissue might be used to assess the
toxic characteristics of polluted waters. The obtained
results (lichen viability expressed in hours, enthalpy
variations for the 2Cl-//lichen interactions) were used to
create a lichen-based biosensor that uses an amperometric
oxygen electrode (a Clark electrode) as a transducer.
The lichen catalyses aromatic ring cleavage (via
pyrocatechase enzymes present in the lichen), and
transforms aromatic substances like 2Cl-/ into muconic
acid (C6H6O4). Following a full electroanalytical characterisation,
the performance of the proposed lichen
biosensor was compared to that of a biosensor based on
Pseudomonas putida cells, which was originally constructed
to monitor benzene in different matrices (water,
air, petrol and oil) and was tested in our laboratory
previousl
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
Recycling of waste glasses in the manufacturing of glass foams
No full textRecycled soda-lime glass was successfully converted into glass foams by a particularly simple and economic processing, consisting of a direct heating of glass powders at temperatures from 900 to 1050 °C. The foaming operated by the oxidation of SiC, inserted as powder additive, was affected by a complex combination of processing temperature, soaking time, devitrification tendency and amount of MnO2, acting as oxidation promoter. A preliminary optimization of the processing parameters led to foams with a good microstructural homogeneity and mechanical strength. A following fundamental optimization was dedicated to the introduction of several waste glasses in the glass/SiC/MnO2 mixtures, aimed at modifying the glass viscosity and devitrification tendency, and led to improved foams, promising for industrial production
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
Metodo per il riciclaggio di soluzioni acquose diluite di acidi forti, in particolare per la rimozione di ioni metallici dalle medesime
No full textDispelling 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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