1,720,980 research outputs found
Costruire il proprio progetto di vita professionale al liceo con l’E-Portfolio: tra autoriflessione e dialogo
Full text linkThe formulation of the professional life project makes a fundamental contribution to the formation of young people’s identity, since it implies a constant confrontation between the realism of the world of work and the image that young people have of themselves. The most recent Guidelines for guidance (MIM, 2022), attach particular importance to the E-Portfolio as a guidance tool that promotes the student’s educational-professional choices after leaving school. Possible ways in which the use of the E-Portfolio promotes the student's awareness and control of the learning process through the documentation of his or her experiences, interests, competences and educational goals, as well as an in-depth reflection on his or her future work, are shown. Finally, the E-Portfolio is presented as a useful “empirical basis” for conducting the guidance interview repeatedly, understood as a dialogical space in which the tutor-teacher can activate an effective communication dynamic with students and their parents
Metabolite Storage in Theobroma cacao L. Seed: Cyto-Histological and Phytochemical Analyses
Full text linkCocoa (Theobroma cacao L.), an economically important tropical-fruit crop as source of chocolate; its seeds contain a large amount of different bioactive compounds that have attracted interest because may be beneficial to humans. The morphological and anatomical characteristics of cocoa seeds are closely related to the aroma and to the nutritional properties. This study aimed to provide more information about the storage of some metabolites in the various components of cocoa seed by microscopical and phytochemical analyses. Polyphenols, sterols, tocopherols and fatty acids were detected in different portions of the seeds (teguments, cotyledons, embryo axis and pulp). Quali and quantitative differences were observed and a characteristic polyphenol pattern was detected in the different portions of the seed; cytological analysis demonstrated the presence of these compounds in big vacuolated polyphenolic cells. Among the analyzed fatty acids, the stearic and oleic acids were the most abundant in all the seed components (teguments, cotyledons and embryo axis). Fatty acids, usually found in the form of esters, thioesters and amides, represent one of the storage substances of cocoa seed probably localized in lipid globules, which in our observations occupied almost the entire volume of small isodiametric cells of cotyledon mesophyll. In the cocoa seeds we observed also a different distribution of sterols: bsitosterol and D5-avenasterol were the most abundant, above all in the embryo axis; stigmasterol and campesterol were less present in embryo axis and more abundant in teguments; campestanol level was again higher in teguments but lower in cotyledons. The specific localization of different kind of sterols was probably related to a peculiar function. Our experiments demonstrated that all seed components contribute to the metabolites storage, but with interesting differences in the localization and amount of each metabolite
Stereoelectronic properties and activity of some imidazolinone herbicides: a computational approach
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Expression analysis of defensin-like genes (Defl) in grapevine in response to Botrytis cinerea and plant defense hormones
No full textDefensins are a class of small, basic, cysteine-rich peptides found in plant, insect and vertebrates, which share a common tertiary structure and show broad antimicrobial activity. By using a combination of HMM and BLAST searches to scan the Vitis vinifera Pinot noir genome, 79 defensin-like sequences (DEFLs) have been identified, which correspond to 46 putative defensin genes.
To better understand the involvement of this gene family in the signalling and defense against Botrytis cinerea, a necrotrophic fungus and agent of the gray rot, we investigated the changes in expression of 14 grapevine defensins in berries and inflorescences following artificial inoculation with the fungus. In parallel, we measured the content of some jasmonates (jasmonate, methyl jasmonate, OPDA) and salicylic acid (SA) in berries infected with Botrytis cinerea and tested whether these defensins are modulated by treatments with these typical mediators of defense.
Among the 14 defensins, five were significantly induced upon B. cinerea infection either in inflorescences or in berries. Analytical measurements revealed that SA, JA and OPDA, but not MeJA were accumulated in infected inflorescences and berries. Preliminary data on berries treated with different hormones showed that none of the tested defensins was induced by treatment with MeJA and BTH (an analogue of salicylic acid), whereas one defensin gene was up-regulated after treatment with ethephon -a precursor of ethylene.
Our results suggest a role of specific DEFLs genes in the grapevine defense against B. cinerea and the involvement of both MeJA and SA in the plant response. Preliminary data on the regulation of defensin genes by hormones have also been acquired
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
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