1,720,957 research outputs found
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
A correlation of anaerobic methane oxidizing archaea with geochemical gradients in coastal Californian marine sediments
No full textThe anaerobic oxidation of methane (AOM) is a globally important process estimated to consume over 384.2 teragrams of the greenhouse gas methane in sediments
per year. At least three anaerobic methane oxidizing archaeal groups, ANME-1, -2, -3,
which further partition into subgroups, have been implicated in this process. However,
none of these organisms have been isolated in pure culture and the ecological and
functional dynamics of AOM remain poorly understood. The ANME express a
homologue of methyl coenzyme M reductase (Mcr), known to catalyze methane
formation in methane-producing archaea. These and other findings suggest that the
ANME are capable of oxidizing methane through a reversal of methanogenesis.
Although small subunit ribosomal DNA (SSU) is a good proxy for the
identification of ANME groups, it is not sufficiently divergent to easily distinguish
between ANME subgroups. The gene for the alpha subunit of Mcr (mcrA), on the other
hand, is divergent enough to resolve fine scale ANME subgroup distributions and is a
functional marker for AOM, as well.
The objective of this study was to evaluate the role of geochemical parameters in
the partitioning of ANME-1 and ANME-2 subgroups in coastal seep sediments. Using a
set of quantitative polymerase chain reaction (qPCR) assays to target the mcrA
subgroups, samples were quantified within and between three separate seep sediment
sites off the coast of California and correlated to methane, sulfate, sulfide, ammonia and
alkalinity measurements.
The analysis indicates that methane porewater concentrations dictate the upper
limit of total ANME abundance, suggesting it is the sole ANME energy source. ANME-2
population structure was strongly influenced by the defined environmental variables, with
differential subgroup partitioning corresponding to sulfate and ammonia gradients. In
contrast, the relationship of ANME-1 with chemistry was not well resolved, indicating
that other factors, such as competition may be the prime determinants of ANME-1
population structure. The study establishes a defined set of parameters governing ANME
subgroup partitioning, which provides a robust quantitative framework for inferring the ecological dynamics of methane oxidizing archaeal communities in a wide variety of
settings.Science, Faculty ofMicrobiology and Immunology, Department ofGraduat
On Collapse
No full textThis project is an active exploration of subjectivities through the medium of weaving. In a narrative illustrated with woven works, the emotional trajectory of this person of mixed cultural background through Swedish society is described. First, the work is contextualized in terms of the larger politico-cultural-discursive context, entitled the outside. It is then positioned in terms of the individual context, the inside, largely dramatized as the developments in the art of western tapestry in the past century. This culminates in the final works, three of which are presented in the final exhibition. They are entitled monads, the etymology of which, in Greek, relates to the words one, alone, or singularity. Each is a conceptual microcosm proposing a different light distribution scheme. They are imprints of alternative actualizing tendencies. There could only be one; at the end of the experiment, Schrodinger’s cat is either dead or alive. The collapse involves the very structure of the ground, and is therefore embedded directly into the weave structure. But remember, each act of observation is an irreversible disturbance to the system. In the interpretation of the primary emanation arises difference, but in which direction will the pendulum swing, and on what forces does its motion hinge? Do subjectivities follow the locality assumption? Do you produce subjectivities or do they produce you
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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