1,720,955 research outputs found
Prima segnalazione di Anodonta (Sinanodonta) woodiana (Lea, 1834) (Mollusca: Bivalvia: Unionidae) per il Sud Italia.
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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
Cholinesterase activities in the Antarctic scallop Adamussium colbecki: tissue expression and effect of ZnCl2 exposure
No full textBiochemical characterization of cholinesterase activity (ChE) was carried out on the Antarctic
scallop Adamussium colbecki collected in winter 2000 from Campo Icaro (Ross Sea,
Antarctica) in order to increase its suitability as a sentinel organism for monitoring the
Antarctic environment. The digestive gland, gills and adductor muscle were investigated for
substrate specificity and inhibitors sensitivity using acetylthiocholine iodide (ASCh) and butyrylthiocholine
iodide (BSCh) as substrates and tetra (monoisopropyl)pyrophosphor-tetramide
(Iso-OMPA), 1,5-bis(4-allyldimethylammoniumphenyl)-penthan-3-one dibromide
(BW284c51) and the insecticide chlorpyrifos as inhibitors. Effect of in vivo exposure to ZnCl2
was also investigated. All the tissues expressed ChE activity (gill>adductor muscle>digestive
gland) and low substrates specificity throughout the hydrolysis of both ASCh and BSCh
substrates. Partial (25–29%) and total inhibition (100%) of ChE activity in gills was demonstrated
following in vitro incubation with Iso-OMPA and BW284c51 (3 mM), respectively.
Concentration-dependent inhibition was also evident with chlorpyrifos in the range 104–1010
M (IC50 106) while in vivo exposure to ZnCl2 did not seem to affect ChE activity in the
scallop. The potential use of ChE in the A. colbecki as biomarker for monitoring water
contamination in the marine Antarctic environment is discussed
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
Preliminary investigation on cholinesterase activity in Adamussium colbecki from Terra Nova Bay: field and laboratory study
No full textWhile the inhibition of cholinesterase (ChE) activity as a biomarker of exposure to neurotoxic insecticides is well
established in aquatic invertebrates of temperate areas, little is known about organisms from polar regions
including Antarctica. Cholinesterase activity was investigated in specimens of the Antarctic scallop, Adamussium
colbecki, collected in winter 2000 at Campo Icaro (Ross Sea, Antarctica) for preliminary characterization of a
potentially new biomarker. Characterization of various ChE enzymes using specific substrates including an
acetylthiocholine iodide (ASCh) and a butyrylthiocholine iodide (BSCh) was performed in gills, digestive gland
and adductor muscle of the scallop. The effect of in vivo Zn2þ exposure in gills and digestive gland of A. colbecki
was also studied. All the tissues expressed ChE activity (gill>adductor muscle>digestive gland) in accordance with
data reported for marine mussels (Mytilus sp.) from temperate areas (1.1–13.8 nmol min1 mg protein1). Significant
BSCh-dependent ChE inhibition was also measured with a specific inhibitor, Iso-OMPA. Exposure to Zn2þ does not
seem to affect ChE activity in the scallop although some slight differences were observed in substrate specificities
(ASCh and BSCh) between treated and untreated organisms. This preliminary study stresses the need for further
investigation on ChE activity in A. colbecki as a biomarker for monitoring water contamination in the marine
Antarctic environment
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