1,721,702 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
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
Molecular mass of poly[(R)-3-hydroxybutyric acid] produced in a recombinant Escherichia coli
No full textPoly[(R)-3-hydroxybutyric acid] (PHB) was produced at 37 degrees C by a recombinant Escherichia coli harboring the Alcaligenes eutrophus biosynthesis phb-CAB genes in Luria-Bertani media containing glucose at 10-30 g/l at different pH values and the time-dependent changes in the molecular mass of PHB were studied. PHB polymers accumulated within cells while glucose was present in the medium. The number-average molecular mass of PHB decreased with time during the course of PHB accumulation, and the values for PHB were markedly dependent on the cultivation conditions of the E. coli, ranging from 0.5 MDa to 20 MDa. Under specific conditions (pH 6.0), E. coli produced PHB with an extremely high molecular mass (20 MDa). It has been suggested that a chain-transfer agent is generated in E. coli cells during the accumulation of PHB.Dr. C. K. Kang is gratefully acknowledged for
his contribution to this work. This study was supported in part by
the Special Coordination Research Fund of the Science and
Technology Agency, Japan
Enrichment of specific monomer in medium-chain-length poly(3-hydroxyalkanoates) by amplification of fadD and fadE genes in recombinant Escherichia coli
No full textRecombinant Escherichia coli strains defective in FadA and/or FadB harboring the Pseudomonas sp. 61-3 polyhydroxyalkanoate (PHA) synthase gene (phaC2(Ps)) were constructed, and were examined for the production of medium-chain-length (MCL) PHA from sodium decanoate and sodium dodecanoate. All the recombinant E. coli strains accumulated MCL-PHAs mainly composed of C6, C8 and C10 monomers from decanoate and those composed of C8, C10 and C12 monomers from dodecanoate. A new metabolic engineering strategy for enriching specific monomers in MCL-PHA was developed by examining the effect of co-expressing the E. coli fadD(Ec), fad(Ec), and/or fadL(Ec) genes along with the PHA synthase gene. Using these engineered E coli strains, MCL-PHAs enriched in 3-hydroxydecanoate up to 80 mol% and 3-hydroxydodecanoate up to 48 mol% were produced from sodium decanoate and sodium dodecanoate, respectively. It was found that the amplification of the fadD(Ec), fadE(Ec) or fadL(Ec) gene had different effect on the monomer composition of MCL-PHA. Among these, the amplification of the fadD(Ec) gene had the most significant effect on the alteration of monomer composition of MCL-PHAs. (C) 2003 Elsevier Science Inc. All rights reserved.This work was supported by the National Research
Laboratory Program (2000-N-NL-01-C-237) of the Korean
Ministry of Science and Technology (MOST), Center for Ultramicrochemical Process Systems and by the BK21 project
from the Ministry of Education. We thank Dr. Isabelle-S.
Hinner (GBF, Germany) for kindly providing plasmid
pBBR1MCS. We also thank Dr. G.M. Church (Harvard
Medical School, USA) for the kind gift of plasmid pKO3
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
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