1,720,972 research outputs found
Accessing cryptic diversity in Neotropical rattlesnakes (Serpentes: Viperidae: Crotalus) with the description of two new species
No full textCarbajal-Márquez, Rubén Alonso, Cedeño-Vázquez, José Rogelio, Martínez-Arce, Arely, Neri-Castro, Edgar, Machkour- M'Rabet, Salima C. (2020): Accessing cryptic diversity in Neotropical rattlesnakes (Serpentes: Viperidae: Crotalus) with the description of two new species. Zootaxa 4729 (4): 451-481, DOI: 10.11646/zootaxa.4729.4.
Comparación del nivel de reconocimiento y neutralización de tres antivenenos mexicanos hacia el veneno de nueve especies de vipéridos
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
cDNA cloning, heterologous expression, protein folding and immunogenic properties of a phospholipase A2 from Bothrops ammodytoides venom
Get PDFA mRNA transcript that codes for a phospholipase (PLA2) was isolated from a single venom gland of the Bothrops ammodytoides viper. The PLA2 transcript was cloned onto a pCR®2.1-TOPO vector and subsequently expressed heterologously in the E. coli strain M15, using the pQE30 vector. The recombinant phospholipase was named rBamPLA2_1, and is composed of an N-terminal fusion protein of 16 residues, along with 122 residues from the mature protein that includes 14 cysteines that form 7 disulfide bonds. Following bacterial expression, rBamPLA2_1 was obtained from inclusion bodies and extracted using a chaotropic agent. rBamPLA2_1 had an experimental molecular mass of 15,692.5 Da that concurred with its theoretical molecular mass. rBamPLA2_1 was refolded in in vitro conditions and after refolding, three main protein fractions with similar molecular masses, were identified. Although, the three fractions were considered to represent different oxidized cystine isoforms, their secondary structures were comparable. All three recombinant isoforms were active on egg-yolk phospholipid and recognized similar cell membrane phospholipids to be native PLA2s, isolated from B. ammodytoides venom. A mixture of the three rBamPLA2_1 cystine isoforms was used to immunize a horse in order to produce serum antibodies (anti-rBamPLA2_1), which partially inhibited the indirect hemolytic activity of B. ammodytoides venom. Although, anti-rBamPLA2_1 antibodies were not able to recognize crotoxin, a PLA2 from the venom of a related but different viper genus, Crotalus durissus terrificus, they recognized PLA2s in other venoms from regional species of Bothrops.Fil: Clement, Herlinda. Universidad Nacional Autónoma de México. Instituto de Biotecnología; México. Universidad Autónoma del Estado de Morelos; MéxicoFil: Corzo, Gerardo. Universidad Nacional Autónoma de México. Instituto de Biotecnología; MéxicoFil: Neri Castro, Edgar. Universidad Nacional Autónoma de México. Instituto de Biotecnología; MéxicoFil: Arenas, Ivan. Universidad Nacional Autónoma de México. Instituto de Biotecnología; MéxicoFil: Hajos, Silvia Elvira. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Estudios de la Inmunidad Humoral Prof. Ricardo A. Margni. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Estudios de la Inmunidad Humoral Prof. Ricardo A. Margni; ArgentinaFil: de Roodt, Adolfo Rafael. Dirección Nacional de Instituto de Investigación. Administración Nacional de Laboratorio e Instituto de Salud "Dr. C. G. Malbrán"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Villegas, Elba. Universidad Autónoma del Estado de Morelos; Méxic
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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