1,720,956 research outputs found
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
Mechanistics insights of hydrogen peroxide transport through PIP aquaporins pore
Get PDFHydrogen peroxide (H2O2) is transported through membranes by aquaporins (AQP). In particular, some plant PIP aquaporins isoforms are efficient H2O2 channels. As water and H2O2 share physicochemical features, it was first supposed that all AQP that transport water could act as an H2O2 channel. However, experimental evidence showed that not all PIP that transport water can transport H2O2. So, the mechanism of H2O2 transport is still an unsolved issue for AQP channels. MtPIP2,3 is a plasma membrane AQP from the legume Medicago truncatula that permeates H2O2. To understand the structural and chemical selectivity mechanisms leading to H2O2 permeability in PIPs, we characterized the particularities of H2O2 passingthrough MtPIP2,3 pore by 1 μs atomistic molecular dynamic simulations. As PIPs are tetrameric pH gated channels we constructed homology MtPIP2,3 models in open and closed states, and with or without H2O2. All models were conformationally stable along the simulation and H2O2 permeation events were found in the simulations in the presence of this molecule. We find that: i- H2O2 molecules can cross the pore in a single file, iidihedral angles adopted by H2O2 along the pore Z axis present a different distribution compared to the angles visited in the solution; in the selectivity-determining NPA region, H2O2 adopts the wider range of dihedral angles, iii- higher residence times are located around the selectivity filter zone in the open channel and moves to the cytoplasmic filterarea in the closed channel; and iv- the constriction in the cytoplasmic filter area seems to be more stringent for H2O2 passage than for water.Our results shed light onto the molecular mechanism of H2O2 passage through MtPIP2,3 and represent the first steps to understand the structural determinants of AQP differential selectivity for these molecules and water.Fil: Chevriau, Jonathan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaFil: Zerbetto de Palma, Gerardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaFil: Zeida, Ari. Universidad de la República; UruguayFil: Alleva, Karina Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaXLIX Reunión Anual de la Sociedad Argentina de BiofísicaArgentinaSociedad Argentina de Biofisic
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
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
Permeation mechanisms of hydrogen peroxide and water through plasma membrane intrinsic protein aquaporins
No full textHydrogen peroxide (H2O2) transport by aquaporins (AQP) is a critical feature for cellular redox signaling. However, the H2O2 permeation mechanism through these channels remains poorly understood. Through functional assays, two Plasma membrane Intrinsic Protein (PIP) AQP from Medicago truncatula, MtPIP2;2 and MtPIP2;3 have been identified as pH-gated channels capable of facilitating the permeation of both water (H2O) and H2O2. Employing a combination of unbiased and enhanced sampling molecular dynamics simulations, we investigated the key barriers and translocation mechanisms governing H2O2 permeation through these AQP in both open and closed conformational states. Our findings reveal that both H2O and H2O2 encounter their primary permeation barrier within the selectivity filter (SF) region of MtPIP2;3. In addition to the SF barrier, a second energetic barrier at the NPA (asparagine-proline-alanine) region that is more restrictive for the passage of H2O2 than for H2O, was found. This behavior can be attributed to a dissimilar geometric arrangement and hydrogen bonding profile between both molecules in this area. Collectively, these findings suggest mechanistic heterogeneity in H2O and H2O2 permeation through PIPs.Instituto de BiotecnologíaFil: Chevriau, Jonathan. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Fisicoquímica Biológica; Argentina.Fil: Chevriau, Jonathan. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zerbetto De Palma, Gerardo. Universidad de Buenos Aires, Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Fisicomatemática; ArgentinaFil: Jozefkowicz, Cintia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Agrobiotecnología y Biología Molecular; ArgentinaFil: Jozefkowicz, Cintia. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Jozefkowicz, Cintia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Genética; ArgentinaFil: Vitali, Victoria Andrea. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Fisicoquímica Biológica; ArgentinaFil: Vitali, Victoria Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Vitali, Victoria Andrea. Universidad de Buenos Aires, Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Fisicomatemática; ArgentinaFil: Canessa Fortuna, Agustina. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Fisicoquímica Biológica; ArgentinaFil: Canessa Fortuna, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Canessa Fortuna, Agustina. Universidad de Buenos Aires, Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Fisicomatemática; ArgentinaFil: Ayub, Nicolás Daniel. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Agrobiotecnología y Biología Molecular; ArgentinaFil: Ayub, Nicolás Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ayub, Nicolás Daniel. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Genética; ArgentinaFil: Soto, Gabriela Cynthia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Agrobiotecnología y Biología Molecular; ArgentinaFil: Soto, Gabriela Cynthia. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Soto, Gabriela Cynthia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Genética; ArgentinaFil: Bienert, Gerd Patrick. Technical University of Munich. TUM School of Life Sciences. Crop Physiology; AlemaniaFil: Bienert, Gerd Patrick. Technical University of Munich. HEF World Agricultural Systems Center; AlemaniaFil: Zeida, Ari. Universidad de la República. Facultad de Medicina. Departamento de Bioquímica and Centro de Investigaciones Biomédicas (Ceinbio); UruguayFil: Alleva, Karina Edith. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Fisicoquímica Biológica; ArgentinaFil: Alleva, Karina Edith. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Alleva, Karina Edith. Universidad de Buenos Aires, Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Fisicomatemática; Argentin
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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