1,720,955 research outputs found
A small cog in a large wheel: crucial role of miRNAs in root apical meristem patterning
No full textIn both animal and plants, establishment of body axes is fundamental for proper organ development. Plant roots show two main developmental axes: the proximo-distal axis, which spans from the hypocotyl-root junction to the root tip, and the radial axis, which traverses from the vascular tissue to the epidermis.Root axes are determined in the root meristem. The root meristem occupies the tip of the root and contains self-renewing stem cells, which continuously produce new root cells. An intricate network of signalling pathways regulates meristem function and patterning to ensure proper root development and growth. In the last decade, microRNAs (miRNAs), 20-21 nucleotide-long molecules with morphogenetic activity, emerged as central regulators of root cell patterning. Their activity intersects with master regulators of meristematic activity, including phytohormones. In this review we discuss the latest findings about miRNAs activity and their interaction with other molecular networks in the formation of root meristem axes. Furthermore, we describe how these small molecules allow root growth to adapt to changes in the environment, while maintaining a correct patterning
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
Performance Modelling of Optimal Combination Algorithms Applied to Arbitrary Data Converter Architectures
No full textThe challenge of designing high-accuracy
Nyquist-rate data converters with acceptable process yield
inevitably leads to adopting ad hoc calibration techniques to
overcome random mismatch errors. Optimal Combination
Algorithms (OCAs) have emerged as a state-of-art calibration
approach for Digital-to-Analog Converters (DACs), mitigating
non-linearity errors by optimally rearranging the mapping
relations between input code and unit elements in the DAC
array. As of today, several OCAs have been demonstrated for
specific DAC architectures, but the design space of
OCA-compensated DACs remains mostly unexplored. In this
work, we provide a wide-range comparison of state-of-art
OCAs and, for the first time, we systematically investigate how
the DAC nominal resolution affects the effectiveness of OCAs,
as for both integral and differential non-linearity performances. The proposed analysis, performed by means of statistical
behavioral simulations, uncovers unforeseen relationships between OCAs performances and the DAC architecture. Attained simulation results heuristically suggest novel parameters of merit that may be adopted to characterize OCAs, moving one preliminary step forward in clarifying trade-offs involved in the design of high-resolution OCA-based DACs
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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