1,720,968 research outputs found
Identification of transmembrane domains that regulate spatial arrangements and activity of prokineticin receptor 2 dimers
Full text linkThe chemokine prokineticin 2 (PK2) activates its cognate G protein-coupled receptor (GPCR) PKR2 to elicit various downstream signaling pathways involved in diverse biological processes. Many GPCRs undergo dimerization that can modulate a number of functions including membrane delivery and signal transduction. The aim of this study was to elucidate the interface of PKR2 protomers within dimers by analyzing the ability of PKR2 transmembrane (TM) deletion mutants to associate with wild type (WT) PKR2 in yeast using co-immunoprecipitation and mammalian cells using bioluminescence resonance energy transfer. Deletion of TMs 5-7 resulted in a lack of detectable association with WT PKR2, but could associate with a truncated mutant lacking TMs 6-7 (TM1-5). Interestingly, TM1-5 modulated the distance, or organization, between protomers and positively regulated Gαs signaling and surface expression of WT PKR2. We propose that PKR2 protomers form type II dimers involving TMs 4 and 5, with a role f
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
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
Characterisation of the molecular mechanisms regulating luteinizing hormone receptor
Full text linkG protein coupled receptors (GPCRs) are the major family of membrane proteins transducing extracellular stimuli into intracellular signals. The luteinizing hormone receptor (LHR) is a GPCR expressed in gonadal and extragonadal tissues where it plays pivotal roles in reproduction and pregnancy. Endocytic trafficking of GPCRs represents a key mechanism in defining cellular responses by controlling signalling at both temporal and spatial level. After ligand activation, LHR is internalised into very early endosomes (VEEs), small vesicles (~400nm in diameter) close to the plasma membrane and distinct from the classic early endosome. Our laboratory identified the Adaptor Protein containing pleckstrin homology (PH) domain, PTB domain and Leucine zipper motif 1 (APPL1) as a marker of ~50% of VEEs where LHR is internalised to. My aims were to characterise the VEE by identifying the mechanisms dictating LHR post-endocytic sorting from this novel compartment, the role of APPL1 and how this impacts receptor signalling. Imaging LHR recycling in real time at single event resolution, enabled me to identify the kinetics and the machinery involved. While APPL1 was not required for LHR localisation in VEEs, it is essential for receptor recycling and negative regulation of cAMP production; two functions never ascribed before to APPL1 for any membrane cargo. These two functions of APPL1 are regulated in an opposing manner by phosphorylation of Ser410 of APPL1, achieved by activation of the Gαs-cAMP-PKA pathway, highlighting the mutual regulation of GPCR trafficking and signalling. I also demonstrated that both Gαs-cAMP and Gαq/11-calcium signalling require LHR internalisation, that endosomal signalling and recycling involves distinct adenylate cyclases and that Gαs activation is restricted to microdomains of the VEE. Finally, LHR recycling and cAMP signalling are also regulated by APPL1 in primary human endometrial stromal cells, where LHR trafficking and signalling could be perturbed in pathological conditions such as PCOS.Open Acces
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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