1,720,964 research outputs found
Comparison of avirulent pathogen Pseudomonas syringae and beneficial Enterobacter sp SA187 for enhancing salt stress tolerance in Arabidopsis thaliana
No full textAbiotic stresses such as salt stress are the major limiting factors for agricultural
productivity, and cause global food insecurity. It is well known that plant associated
beneficial microorganisms can stimulate plant growth and enhance resistance to
abiotic stresses. In this context, bacterial endophytes are a group of bacteria that
colonize the host plant and play a fundamental role in plant growth enhancement
under stress condition. Recently, our group reported that the beneficial bacteria
Enterobacter sp.SA187 induces plant growth in Arabidopsis under salt stress
conditions by manipulation of the plant ethylene signaling pathway. We therefore
compared inoculation of plants by SA187 with virulent and non-virulent strains Pst
DC3000. Although both strains inhibit plant growth at ambient conditions, Pst DC3000
hrcC-, but not Pst DC3000, induced salt stress tolerance, suggesting that Pst DC3000
hrcC- also contains plant growth promoting activity under stress conditions. Our
results indicate that Pst DC3000 hrcC- shares features with beneficial bacteria by
inducing salt tolerance through reduction of the shoot and root Na+/K+ ratio. To
further elucidate the underlying mechanisms of this interaction with Arabidopsis,
RNAseq, hormone and biochemical analyses were performed. Genetic studies also
show that Pst DC3000 hrcC- induced salt stress tolerance involving several
phytohormone pathways, including auxin, ethylene and salicylic acid. Transcriptome
and genetic analyses indicate that glucosinolates play an important role in this
beneficial interaction. We found that indolic and alkyl glucosinolates act as negative
factors on Pst DC3000 hrcC-, alkyl glucosinolates are positive and indolic
glucosinolates negative regulators in SA187 interaction with Arabidopsis. These
results reveal that besides a repertoire of effectors, Pst DC3000 hrcC- also produces
factors that can be beneficial for plant growth under certain stress conditions, as
observed with Enterobacter sp. SA187
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
Exogenous application of agmatine improves water stress and salinity stress tolerance in turnip (Brassica rapa L.)
Get PDFThis study was carried out to determine the consequence of foliar application of agmatine (0 and 0.5 mM), on growth, physiological and biochemical traits, and yield of turnip (Brassica rapa L.) plants grown under water stress or salt stress conditions. The effect of three irrigation regimes (100%, 80% and 40% of field capacity) and three salt concentrations (0, 100 and 200 mM NaCl) on turnip plants grown in pots under greenhouse conditions were studied. Water deficit developed at 40% Field capacity (FC) and salinity stress, especially at 200 mM, resulted in significant decreases in all growth parameters when compared to control plants (100% FC) including root length and diameter as well as shoot weights per plant. Water stress and high salt stress negatively affected most physiological and biochemical characteristics such as total chlorophyll, photosynthetic rate, stomatal conductance, and transpiration rate. Water use efficiency (WUE) increased under 80% FC or 100 mM NaCl. Antioxidant enzymes activity, catalase and peroxidase and glutathione reductase, increased with water stress and salt stress. Foliar application of agmatine seemed to alleviate the adverse effects of water stress and salt stress on turnip. Alleviating harmful effects of salt stress and enhancing water stress tolerance by agmatine was associated with improving leaf gas exchange, antioxidant enzymes and protein profile
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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