1,720,960 research outputs found
Carboxyl domain of glutamate receptor directs its coupling to metabolic pathways.
No full textOf the six metabotropic glutamate receptors (mGluRs) only mGluR1 and mGluR5, which possess a large carboxyl terminal domain, are positively linked to phosphoinositide (PI) hydrolysis. We expressed a 3' deletion of mGluR1 alpha (mGluR1T) lacking the terminal 290 codons and the full length mGluR1 alpha cDNAs in human embryonic kidney 293 cells. Agonist stimulation of both mGluR1 alpha and mGluR1T stimulated PI hydrolysis. Glutamate activation of PI hydrolysis was reduced by pertussis toxin when mediated via mGluR1 alpha, while mGluR1T required the presence of extracellular Ca2+. Glutamate-mediated reduction of adenylyl cyclase stimulation by forskolin occurred only in mGluR1T-expressing cells. The results suggest that the carboxyl terminal extension directs the coupling of mGluR1 with different signal transduction pathways
Functional evidence for a L-AP3-sensitive metabotropic receptor different from glutamate metabotropic receptor mGluR1.
No full textThe efficacy of mGluR agonists quisqualate and 1S,3R-aminocyclopentane-1,3-dicarboxylic acid (1S,3R-ACPD) in stimulating the inositol phosphate (IP) formation in primary cultures of cerebellar granule neurons correlated with mGluR1 mRNA expression and was affected by the medium KCl content. L-2-Amino-3-phosphonopropionic acid (L-AP3) mimicked the stimulatory action of mGluR agonists. Maximal stimulatory doses of mGluR agonist 1S,3R-ACPD and L-AP3 were additive, suggesting the action of L-AP3 on a receptor different from mGluR1. Indeed, in embryonic kidney 293 cells transfected with mGluR1 cDNA quisqualate and 1S,3R-ACPD but not L-AP3 stimulated the IP formation
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
Trans-azetidine-2,4-dicarboxylic acid activates neuronal metabotropic receptors.
No full textThe expression of metabotropic glutamate receptors (mGluRs) in primary cultures of cerebellar granule neurones can be: (i) modulated by the degree of depolarization during the culture period, rendering neurones differently sensitive to agonist-stimulated inositol phosphate (IP) hydrolysis; (ii) down-regulated by specific mGluR agonists. In this culture the new rigid glutamate analogue, (+/-)-trans-azetidine-2,4-dicarboxylic acid (t-ADA) and the known mGluR agonist 1S,3R-aminocyclopentane-1,3-dicarboxylic acid (1S,3R-ACPD) stimulated IP formation in line with the depolarization-modified expression of mGluR1. However, the two compounds caused different patterns of mGluR down-regulation. The effects of t-ADA and 1S,3R-ACPD were also tested on transformed human embryonic kidney 293 cells transfected with mGluR1. Only 1S,3R-ACPD, but not t-ADA, stimulated IP hydrolysis, suggesting that t-ADA acts on a subtype of metabotropic receptors different from mGluR1. Hence, t-ADA might prove useful in differentiating the function of various mGluR subtypes
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
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