1,720,958 research outputs found
Salt stress impacts the photosynthetic activity of Amaranthus cruentus: an -omic and physiological analysis
No full textAmaranthus sp. (amaranths) is a genus of plants in Amaranthaceae family. Several species, like A. cruentus, are minor crops cultivated for either seed production or for their edible leaves. They are renowned for their tolerance to biotic and abiotic stress and their excellent nutritional quality, making them promising crops in challenging environmental conditions. Soil salinity is one of the main abiotic stress constraining crop growth, mostly in (semi-)arid regions. Most of the crops used today are glycophyte (i.e. salt sensitive); finding salt-tolerant cultivars or new species is therefore a priority for sustainable agriculture. Photosynthetic activity of Amaranthus cruentus (red amaranth, a plant with C4-type photosynthesis) was studied in response to a moderate saline stress (75 mM) in controlled conditions. Analysis of photosynthesis parameters, recorded with an infrared gas analyzer coupled with a fluorimeter (IRGA), showed a deleterious effect of salt stress on the light-independent reactions of photosynthesis (net carbon assimilation), but not on the light-dependent reactions (electron transport rate and quantum yield of photosystem II). Transpiration and stomatal conductance were also affected by salt. Transcriptomic and proteomic analysis were also performed on leaves. Differentially expressed genes and differentially accumulated proteins involved in metabolic pathways related to photosynthesis were used to explain photosynthetic activity data. Finally, chlorophylls and carotenoids content in leaves were compared to IRGA and -omics data
Trehalose transporter gene diversity in the anhydrobiotic brine shrimp Artemia franciscana
No full textSociety for Experimental Biology (SEB) Annual Conference, 2-5 July 2024, Prague.-- 1 page, figuresPeer reviewe
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
Light and retrograde signals converge to regulate different facets of photomorphogenic development
No full textTrabajo presentado a la Society of Experimental Biology (SEB)Annual Conference, celebrada on-line del 29 de junio al 8 de julio de 2021.Peer reviewe
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
Impact of cadmium and zinc on the physiology of industrial hemp and evaluation of the protective effect of silicon in hydroponic solution
No full textHeavy metals (HMs) such as cadmium (Cd) and zinc (Zn) disrupt photosynthesis and plant physiology. This study assesses their impact on hydroponically grown industrial hemp (Cannabis sativa) and examines the potential role of silicon (Si) as a protective agent, the latter being known to improve resistance to biotic and abiotic stresses. Various experimental conditions were established, including controls, exposure to Cd and Zn, and treatment with silicon. Physiological effects were assessed by analysing the light response curve, gas exchange and chlorophyll fluorescence, while pigment content was compared using a proteomic approach. The results show a significant decrease in electron transport, net CO2 assimilation, PSII effective quantum yield, transpiration and stomatal conductance. These perturbations reflect stomatal closure as well as altered electron transport under metal stress. In addition, analysis of light saturation highlights a reduction in maximum CO2 uptake and PSII quantum efficiency, as well as an increase in dark respiration in the face of HM stress. Cd and Zn exposure led to a reduction in chlorophyll and carotenoid levels, indicating pigment degradation. The increase in the chlorophyll a/b ratio under metal stress reflects a specific inhibition of chlorophyll b. Contrary to expectations, silicon supplementation did not mitigate the effects of pollutants. These results highlight the negative impact of HMs on the physiology of industrial hemp and reveal the ineffectiveness of silicon as a protective agent in this context. Proteomic analysis provides additional information on the differential accumulation of proteins and the mechanisms underlying the effects of Cd and Zn
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