1,721,239 research outputs found
Dagli scarti delle uve una risorsa per l'industria chimica: il progetto VALSOVIT
No full textIl progetto Valsovit - Valorizzazione sostenibile degli scarti della filiera vitivinicola per l’industria chimica e salutistica, è finanziato sul Bando POR FESR Emilia-Romagna ed è finalizzato alla valorizzazione di seconda generazione dei sottoprodotti per la produzione di sostanze ad alto valore aggiunto (bioplastiche, intermedi di sintesi, biogas) sfruttando tecnologie a basso impatto ambientale
A new tecnique for the evaluation of antifungal activity of an alcohol extract of Eugenia caryophyllata Thunberg on Pennicillium digitatum
No full textThe purpose of the present work was to test the activity of an extract of cloves E. caryophyllata Thunberg using the phytopathogen Penicillium digitatum as test fungus and to identify which components are most likely responsible for its antifungal activity. This plant is well known from the phytochemical point of view and for its antibacterial, antifungine activity and other biological properties. To obtain results with this fungus that shows a very fast growth a new, more appropriate technique, counting the number of colonies formed within 48 hours, had to be set up. The extract and the pure standard eugenol were highly active, totally preventing fungal growth, even at the lowest doses, karyophyllene did not shown any effect
Compositional characteristics of some chestnut biotypes of Emiliano-Romagnolo Apennine
No full textCompositional data of commercial "cured" chestnuts (Castanea sativa Mill.) of three biotypes coming from different mountain areas of Emilia-Romagna were monitored during two years (1999-2000). The characteristics of the nuts of two biotypes particularly appreciated in local markets such as Marrone di Alfero and Marrone di Zocca, respectively from Alfero (FC) and Zocca (MO), were compared to those of fruits of Marrone di Castel del Rio harvested in the production area regulated by IGP.
All the considered biotypes showed a large variation of each single constituent and the effect of the year of harvest resulted in some cases a source of variability far more important than the effect of the biotype. Principal components analysis (PCA) was used to describe the chemical composition of samples and the three biotypes resulted characterized by different values of sugars content over two years of analysis. The cluster analysis permitted to discriminate the three biotypes on the basis of their chemical composition independently from the year of harvest
Distribution of internal secretory structures in Tagetes patula (Asteraceae)
No full textSeedlings and flowering plants of Tagetes patula present secretory reservoirs similat to many other Asteraceae which produce polyacetylenes. These polyacetylene reservoirs (PRs) that contain both thiophene and essential oils, show a blue-yellow fluorescence and a red colour when observed in the UV and conventional microscope respectively. In the root of the seedlings two arrays of six PRs arise abutting on the endodermis. PRs of branch roots are connected to those in the parent roots. A single layer of "epithelial" non-specialised cells forms the secretory tissue. In the hypocotyl four PRs, characterised by a uniseriate epithelium, arise in the cortex in front of the vascular bundles. In the epicotyl, instead, we found eight PRs localised between the vascular bundles. In the cotyledons, in the leaves and in the flower bracts there are only secretory cavities. In the flowering plant, PRs also occur in the corolla of the tubular and ligulate flowers of the inflorescence, with a typically biseriate epithelium
Wheat classification according to its origin by an implemented volatile organic compounds analysis
No full textFood volatile organic compounds (VOCs) analysis is a useful tool in authentication and classification processes, but, to date, the analysis of wheat VOCs is still little explored. In this study a method of analysis based on solid phase microextraction coupled with gas chromatography-mass spectrometry was optimized by testing different types of fibers, sample preparation methods and amounts, extraction temperatures and times, desorption times and oven programs. The analysis was applied to six wheat cultivars harvested in different areas, and permitted to identify 158 VOCs, of which 98 never found before. A principal component analysis performed on the dataset showed that the area of cultivation accounted for the highest source of variability. Partial least squares analysis permitted to correctly classify wheats based on their cultivation area and species, and to identify the most discriminant VOCs. These results are promising for the study of the influence of geographical origin on wheat quality
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
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