1,721,004 research outputs found
Microbial diversity characterizing different depth zones inside the ice cave Cenote Abyss
No full textMicrobial life at the cryosphere represents a unique archive of peculiar and slow biogeochemical processes in ancient and chilly environmental conditions. The investigation of the geomicrobiology of ice layers of glacial locations provide clues for the past climate reconstruction and for understanding the impact of climate change on ice. Here, we provide a first description of the microbial communities inhabiting ice sediments collected at different depth inside the ice cave Cenote Abyss located on the Italian Alps. This cave was first explored in 1994 after the emptying of a lake and currently represents one of the most voluminous cave glaciers of the Dolomites. The microbial communities of Cenote Abyss were dominated by members of Actinobacteria, Bacteroidetes and Proteobacteria well adapted to extreme temperatures and possibly involved in different steps of the nitrogen cycle in accordance with the cave depth. From the shallowest to the deepest zones of the cave, the microbial community composition shifted from the dominance of nitrogen fixing bacteria, such as Parafrigobacterium, Polaromonas and Pedobacter, to the high presence of nitrifying bacteria including Nitrospira. Further
studies will be aimed at correlating these peculiar microbial conditions present in the different cave zone
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
Comment on “Sandstone caves on Venezuelan tepuis: Return to pseudokarst?” by R. Aubrecht, T. Lánczos, M. Gregor, J. Schlögl, B. Smída, P. Liscák, Ch. Brewer-Carías, L. Vlcek, Geomorphology 132 (2011), 351–365
No full textIn the recent work of Aubrecht et al. (2011) the presence of “unlithified or poorly-lithified beds” of sands in the
quartz-sandstone stratigraphic succession is proposed as a key factor for speleogenesis in the Venezuelan tepuis.
In this comment we observe that in the cited work the geologic history of the region, in terms of sedimentation
environment, diagenesis and low grade burial metamorphism, has not been considered. Furthermore, the
peculiar “pillar flow” columns that Aubrecht et al. describe as a proof of the unlithification are lacking in
many other different cave systems in the same area.
Four critical points are discussed: the burial metamorphism of the Mataui Formation, the significance of the
Schmidt Hammer measurements, the cave morphologies and the role of SiO2 dissolution. Finally we suggest
that weathering, in its wider significance, is probably the triggering process in speleogenesis, and there is no
need to invoke a differential diagenesis of the sandstone beds
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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