1,720,964 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
Maturation morpho-fonctionnelle de la synapse fibre moussue/cellule pyramidale de CA3 dans l’hippocampe
No full textThe formation of synapses follows different steps including synaptogenesis and maturation. Thesedifferent steps depend on coordinated pre- and post-synaptic assembly. Pre-synaptic proteins andionotropic glutamate receptors play a central role in these processes. During my thesis, I have beeninterested in the implication of the presynaptic protein Bassoon in the maturation of the hippocampalmossy fiber to CA3 pyramidal cell glutamatergic synapses. This synapse constitutes an attractivemodel for the study of synaptic maturation because it follows several steps of defined morphologicaland functional maturation. Bassoon in one of the first protein present at newly formed synapticcontacts. By electrophysiological approaches, we showed that Bassoon is important for theorganization of the active zone during the first two postnatal weeks.Kainate receptors play an important role in the regulation of network activity during postnataldevelopment. However, the impact of kainate receptors activation on synaptic maturation is less known.I showed a delay in functional maturation of mossy fiber synapses in mice deficient for the GluK2subunit of kainate receptors (GluK2-/-). To know if this delay is correlated to morphological alterations ofthis synapse, we setup in vivo lentiviral infections of membrane fluorescent protein (YFP) in mousepups (P1-P2). Using confocal microscopy and 3D reconstruction, we described the morphologicalmaturation of mossy fiber synapses. We were able to correlate functional and morphological maturationand our results also showed an impairment in the formation of mossy fiber synapses in GluK2-/-.Together, these data reveal the importance of synaptic activity and of the coordination of pre- and postsynaptic assembly during synaptic maturation.Les synapses se forment selon plusieurs étapes comprenant la stabilisation des contacts nouvellementformés et leur maturation. Ces différentes étapes dépendent d’une mise en place coordonnée entre laterminaison pré- et postsynaptique. Les protéines composant la présynapse et les récepteursionotropiques du glutamate ont des rôles clés dans ces processus. Lors de ma thèse, je me suisintéressé à l’implication de la protéine présynaptique Bassoon lors de la maturation des synapsesglutamatergiques entre les fibres moussues et les cellules pyramidales de CA3 dans l’hippocampe.Cette synapse constitue un modèle attractif pour l’étude de la maturation synaptique car elle suit desétapes de maturation morphologique et fonctionnelle bien définies. Bassoon est une des premièresprotéines se mettant en place au niveau des contacts synaptiques nouvellement formés. Par desapproches électrophysiologiques, nous avons montré que la protéine Bassoon était importante pourl’organisation du site de libération de neurotransmetteur durant les deux premières semaines de viepost-natale chez la souris.Les récepteurs kaïnate jouent un rôle important dans la régulation de l’activité de réseau au cours dudéveloppement post-natal. Cependant l’impact de l’activation de ces récepteurs sur la maturationsynaptique est peu connu. J’ai pu mettre en évidence un délai dans la maturation fonctionnelle de lasynapse fibre moussue/cellule pyramidale de CA3 chez les souris déficientes pour la sous-unité GluK2des récepteurs kaïnate (GluK2-/-). Afin de comprendre si ce délai de maturation fonctionnelle est corréléà un retard dans la maturation morphologique de cette synapse, nous avons mis en place desinfections de lentivirus codant pour une protéine membranaire fluorescente (YFP) chez le souriceaunouveau-né (P1-P2). A l’aide de microscopie confocale et de reconstruction en 3D, nous avons ainsi pudécrire la maturation morphologique de la synapse fibre moussue/cellule pyramidale de CA3. Cela m’aégalement permis de corréler la maturation fonctionnelle à la maturation morphologique et mesrésultats montrent également un retard dans la mise en place des synapses chez les souris GluK2-/-.L’ensemble de cette étude révèle l’importance de l’activité synaptique et de la coordination entre miseen place de la pré- et de la postsynapse au cours de la maturation synaptique
Maturation morpho-fonctionnelle de la synapse fibre moussue/cellule pyramidale de CA3 dans l’hippocampe
No full textThe formation of synapses follows different steps including synaptogenesis and maturation. Thesedifferent steps depend on coordinated pre- and post-synaptic assembly. Pre-synaptic proteins andionotropic glutamate receptors play a central role in these processes. During my thesis, I have beeninterested in the implication of the presynaptic protein Bassoon in the maturation of the hippocampalmossy fiber to CA3 pyramidal cell glutamatergic synapses. This synapse constitutes an attractivemodel for the study of synaptic maturation because it follows several steps of defined morphologicaland functional maturation. Bassoon in one of the first protein present at newly formed synapticcontacts. By electrophysiological approaches, we showed that Bassoon is important for theorganization of the active zone during the first two postnatal weeks.Kainate receptors play an important role in the regulation of network activity during postnataldevelopment. However, the impact of kainate receptors activation on synaptic maturation is less known.I showed a delay in functional maturation of mossy fiber synapses in mice deficient for the GluK2subunit of kainate receptors (GluK2-/-). To know if this delay is correlated to morphological alterations ofthis synapse, we setup in vivo lentiviral infections of membrane fluorescent protein (YFP) in mousepups (P1-P2). Using confocal microscopy and 3D reconstruction, we described the morphologicalmaturation of mossy fiber synapses. We were able to correlate functional and morphological maturationand our results also showed an impairment in the formation of mossy fiber synapses in GluK2-/-.Together, these data reveal the importance of synaptic activity and of the coordination of pre- and postsynaptic assembly during synaptic maturation.Les synapses se forment selon plusieurs étapes comprenant la stabilisation des contacts nouvellementformés et leur maturation. Ces différentes étapes dépendent d’une mise en place coordonnée entre laterminaison pré- et postsynaptique. Les protéines composant la présynapse et les récepteursionotropiques du glutamate ont des rôles clés dans ces processus. Lors de ma thèse, je me suisintéressé à l’implication de la protéine présynaptique Bassoon lors de la maturation des synapsesglutamatergiques entre les fibres moussues et les cellules pyramidales de CA3 dans l’hippocampe.Cette synapse constitue un modèle attractif pour l’étude de la maturation synaptique car elle suit desétapes de maturation morphologique et fonctionnelle bien définies. Bassoon est une des premièresprotéines se mettant en place au niveau des contacts synaptiques nouvellement formés. Par desapproches électrophysiologiques, nous avons montré que la protéine Bassoon était importante pourl’organisation du site de libération de neurotransmetteur durant les deux premières semaines de viepost-natale chez la souris.Les récepteurs kaïnate jouent un rôle important dans la régulation de l’activité de réseau au cours dudéveloppement post-natal. Cependant l’impact de l’activation de ces récepteurs sur la maturationsynaptique est peu connu. J’ai pu mettre en évidence un délai dans la maturation fonctionnelle de lasynapse fibre moussue/cellule pyramidale de CA3 chez les souris déficientes pour la sous-unité GluK2des récepteurs kaïnate (GluK2-/-). Afin de comprendre si ce délai de maturation fonctionnelle est corréléà un retard dans la maturation morphologique de cette synapse, nous avons mis en place desinfections de lentivirus codant pour une protéine membranaire fluorescente (YFP) chez le souriceaunouveau-né (P1-P2). A l’aide de microscopie confocale et de reconstruction en 3D, nous avons ainsi pudécrire la maturation morphologique de la synapse fibre moussue/cellule pyramidale de CA3. Cela m’aégalement permis de corréler la maturation fonctionnelle à la maturation morphologique et mesrésultats montrent également un retard dans la mise en place des synapses chez les souris GluK2-/-.L’ensemble de cette étude révèle l’importance de l’activité synaptique et de la coordination entre miseen place de la pré- et de la postsynapse au cours de la maturation synaptique
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
