1,720,971 research outputs found
Role of the SNARE Memb11 as "receptor" of the GTPase Arf1 at the Golgi apparatus of Arabidopsis thaliana
No full textLes protéines SNARE (Soluble N-ethylmaleimide-sensitive factor Attachment protein REceptor) sont essentielles pour la fusion membranaire. J'ai étudié chez Arabidopsis thaliana la SNARE Memb11 de l’appareil de Golgi qui intervient au début de la voie sécrétoire à l'interface Réticulum endoplasmique (RE)-appareil de Golgi. Dans les cellules de mammifères, l'orthologue de Memb11 (Membrine) est un « récepteur » potentiel de la GTPase Arf1 à la membrane golgienne. Cette dernière est impliquée dans le recrutement de la machinerie COPI nécessaire au transport rétrograde de l'appareil de Golgi vers le RE. Le but de ce travail était de déterminer si Memb11 pouvait interagir avec Arf1 dans les cellules végétales. Des anticorps dirigés contre la partie cytosolique de Memb11 ont été obtenus et ont été utilisés sur tissus végétaux pour réaliser des immunomarquages en microscopie électronique à transmission et des immunoprécipitations sur extraits de plantes. Il a été démontré que Memb11 est située au niveau de la membrane cis-golgienne et qu'elle co-immunoprécipite avec Arf1, suggérant ainsi que Arf1 peut interagir avec Memb11. J'ai confirmé l'interaction de Memb11 et Arf1 au niveau de l'appareil de Golgi par des expériences de BiFC (Bimolecular Fluorescence Complementation) in vivo. Cette interaction est spécifique puisque ni Memb12 (90% d'identité avec Memb11) ni Sec22 interagissent avec Arf1. Grâce à une approche de bioinformatique structurale, j'ai déterminé les régions de Memb11 (différentes de Memb12) qui pourraient être critiques pour l'interaction et j’ai commencé à tester in vivo les mutants correspondants par BiFC. En outre, des expériences d’immunoprécipitations avec des protéines recombinantes produites in vitro suggèrent que la forme d’Arf1 liée au GTP interagit avec Memb11.The SNARE proteins (Soluble N-ethylmaleimide-sensitive factor Attachment protein REceptor) are critical for membrane fusion in the secretory pathway. I have studied the Golgi SNARE Memb11 in Arabidopsis thaliana cells. Memb11 is involved at the ER-Golgi interface. In mammalian cells, the ortholog of Memb11 (Membrin) is the potential “receptor” of the GTPase Arf1 in the Golgi membrane. This protein is involved for the recruitment of the COPI machinery, required for retrograde transport from the Golgi to the ER. The aim of this work was to determine whether Memb11 can interact with Arf1 in plant cells. Antibodies against the cytosolic part of Memb11 were obtained and were applied on plant tissues to perform immunolabeling by transmission electron microscopy and immunoprecipitation (IP) studies. It has been shown that Memb11 is located at the cis-Golgi and that it co-immunoprecipated with Arf1, suggesting that Arf1 may interact with Memb11. I confirmed the interaction of Memb11 and Arf1 at the Golgi by in vivo BiFC (Bimolecular Fluorescence Complementation) experiments. This interaction was specific since neither Memb12 (90% identity with Memb11) nor Sec22 interacted with ARF1. Thanks to a structural bioinformatic approach, I determined the regions in Memb11 (different from Memb12) that could be critical for the interaction and started to test corresponding mutants in vivo by BiFC. In addition, IP experiments with recombinant proteins produced in vitro suggest that the GTP-bound form of ARF1 interacts with Memb11
Role of the SNARE Memb11 as "receptor" of the GTPase Arf1 at the Golgi apparatus of Arabidopsis thaliana
No full textLes protéines SNARE (Soluble N-ethylmaleimide-sensitive factor Attachment protein REceptor) sont essentielles pour la fusion membranaire. J'ai étudié chez Arabidopsis thaliana la SNARE Memb11 de l’appareil de Golgi qui intervient au début de la voie sécrétoire à l'interface Réticulum endoplasmique (RE)-appareil de Golgi. Dans les cellules de mammifères, l'orthologue de Memb11 (Membrine) est un « récepteur » potentiel de la GTPase Arf1 à la membrane golgienne. Cette dernière est impliquée dans le recrutement de la machinerie COPI nécessaire au transport rétrograde de l'appareil de Golgi vers le RE. Le but de ce travail était de déterminer si Memb11 pouvait interagir avec Arf1 dans les cellules végétales. Des anticorps dirigés contre la partie cytosolique de Memb11 ont été obtenus et ont été utilisés sur tissus végétaux pour réaliser des immunomarquages en microscopie électronique à transmission et des immunoprécipitations sur extraits de plantes. Il a été démontré que Memb11 est située au niveau de la membrane cis-golgienne et qu'elle co-immunoprécipite avec Arf1, suggérant ainsi que Arf1 peut interagir avec Memb11. J'ai confirmé l'interaction de Memb11 et Arf1 au niveau de l'appareil de Golgi par des expériences de BiFC (Bimolecular Fluorescence Complementation) in vivo. Cette interaction est spécifique puisque ni Memb12 (90% d'identité avec Memb11) ni Sec22 interagissent avec Arf1. Grâce à une approche de bioinformatique structurale, j'ai déterminé les régions de Memb11 (différentes de Memb12) qui pourraient être critiques pour l'interaction et j’ai commencé à tester in vivo les mutants correspondants par BiFC. En outre, des expériences d’immunoprécipitations avec des protéines recombinantes produites in vitro suggèrent que la forme d’Arf1 liée au GTP interagit avec Memb11.The SNARE proteins (Soluble N-ethylmaleimide-sensitive factor Attachment protein REceptor) are critical for membrane fusion in the secretory pathway. I have studied the Golgi SNARE Memb11 in Arabidopsis thaliana cells. Memb11 is involved at the ER-Golgi interface. In mammalian cells, the ortholog of Memb11 (Membrin) is the potential “receptor” of the GTPase Arf1 in the Golgi membrane. This protein is involved for the recruitment of the COPI machinery, required for retrograde transport from the Golgi to the ER. The aim of this work was to determine whether Memb11 can interact with Arf1 in plant cells. Antibodies against the cytosolic part of Memb11 were obtained and were applied on plant tissues to perform immunolabeling by transmission electron microscopy and immunoprecipitation (IP) studies. It has been shown that Memb11 is located at the cis-Golgi and that it co-immunoprecipated with Arf1, suggesting that Arf1 may interact with Memb11. I confirmed the interaction of Memb11 and Arf1 at the Golgi by in vivo BiFC (Bimolecular Fluorescence Complementation) experiments. This interaction was specific since neither Memb12 (90% identity with Memb11) nor Sec22 interacted with ARF1. Thanks to a structural bioinformatic approach, I determined the regions in Memb11 (different from Memb12) that could be critical for the interaction and started to test corresponding mutants in vivo by BiFC. In addition, IP experiments with recombinant proteins produced in vitro suggest that the GTP-bound form of ARF1 interacts with Memb11
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
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
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