1,720,960 research outputs found
Fas-associated factor (FAF1) is required for the early cleavage-stages of mouse embryo
No full textFAF1 was initially isolated as a Fas-associated factor and was subsequently found to interact with a subset of additional proteins that are involved in many cellular events including Fas-mediated apoptosis, heat shock signalling pathways and ubiquitin-dependent processes. Here, we describe that the 74-kDa FAF1 is ubiquitously expressed, while the expression of its post-translational-processed 49-kDa isoform is restricted to post-meiotic male germ cells. In ovary, FAF1 protein is localized predominantly in the cytoplasm of oocytes in all follicle stages. To determine the function of FAF1 in vivo, we analysed a mouse mutant line in which a gene trap vector was inserted in the Faf1 locus. The mutation disrupts the Faf1 and leads to lethality of the Faf1(GT/GT) embryos near the 2-cell stage. Analysis of FAF1 expression revealed that the protein is present in early preimplantation stages, while embryonic expression of Faf1 mRNA becomes appreciable at 4-cell stage. These results indicate that the death of Faf1(GT/GT) at the 2-cell stage may coincide with the depletion of maternal FAF1 in these embryos. Thus, our results indicate that the FAF1 gene product is necessary for early embryonic development
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
Respiratory Distress and Early Neonatal Lethality in Hspa4l/Hspa4 Double-Mutant Mice
No full textHeat shock proteins HSPA4L and HSPA4 are closely related members of the HSP110 family and act as cochaperones. We generated Hspa4l(-1-) Hspa4(-1-) mice to investigate a functional complementarity between HSPA4L and HSPA4 during embryonic development. Hspa4l(-1-) Hspa4(-1-) 2 embryos exhibited marked pulmonary hypoplasia and neonatal death. Compared with lungs of wild- type, Hspa4l(-1-) , and Hspa4(-1-) embryos, Hspa4l(-1-) Hspa4(-1-) lungs were characterized by diminished saccular spaces and increased mesenchymal septa. Mesenchymal hypercellularity was determined to be due to an increased cell proliferation index and decreased cell death. A significant increase in expression levels of prosurvival protein B cell leukemia/ lymphoma 2 may be the cause for inhibition of apoptotic process in lungs of Hspa4(-1-) Hspa4l(-1-) embryos. Accumulation of glycogen and diminished expression of surfactant protein B, prosurfactant protein C, and aquaporin 5 in saccular epithelium suggested impaired maturation of type II and type I pneumocytes in the Hspa4l(-1-) Hspa4(-1-) lungs. Further experiments showed a significant accumulation of ubiquitinated proteins in the lungs of Hspa4l(-1-) Hspa4(-1-) embryos, indicating an impaired chaperone activity. Our study demonstrates that HSPA4L and HSPA4 collaborate in embryonic lung maturation, which is necessary for adaptation to air breathing at birth
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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