1,721,030 research outputs found
The fate of bioactive compounds during traditional preparation of einkorn wheat (Triticum monococcum L. subsp. monococcum) bulgur
No full textEinkorn wheat bulgur is a traditional food deeply rooted in some areas of Turkey, since ages. The objective of this study was to evaluate the impact of simulated traditional bulgur preparation on einkorn wheat bioactive compound content. A local einkorn wheat grain sample from Turkey was boiled for 2, 3 and 4 h, then dried in a thermo-ventilated oven. Tocols, carotenoids, phytosterols and phenolics, determined as free (FPC) and bound (BPC) phenolic compounds, were analysed in hulled (spikelets) and dehulled (kernels) bulgur samples, to highlight also glumes’ contribute to their content and evolution. Kernel carotenoid and tocol content significantly decreased following bulgur preparation, to an extent of 42–58% and 15–30%, respectively. Phytosterols slightly decreased in cooked (12–19%), with respect to raw kernels. Phenolics showed different patterns, highlighting glumes’ contribute: kernel FPC increased (+87%) after 4 h of boiling, whereas no significant variations were observed for BPC. A drastic decrease of total and BPC (20.5–28.0%), was observed in spikelets following bulgur preparation. Ferulic and p-coumaric acid resulted the most abundant phenolic acids, respectively, in kernels and spikelets. Decreases in tocol, carotenoids and phytosterol contents were observed whereas an increase of kernel FPC content was calculated after cooking
Stereoselective synthesis of bis(α-amino acid) derivatives isosteric of cysteine. Part 4
No full textControllo e sindacati azionari nelle società quotate italiane
Get PDFLo studio propone un indagine empirica sugli assetti proprietari delle società quotate italiane, per individuare situazioni di controllo individuale o congiunto, messi in relazione alla dimensione a-ziendale delle società, onde verificare l’interazione tra la struttura del controllo societario e le potenzialità economiche dell’impresa.
L’indagine si soffermerà sui sindacati azionari, per valutarne la ri-levanza nel contesto delle società quotate: analizzando il contenuto del-le pattuizioni, si cercherà di mettere a fuoco l’incidenza di tali patti su-gli assetti di controllo delle società stesse. L’analisi delle situazioni di controllo congiunto da sindacato azionario potrà fornire ulteriori indica-zioni sulla correlazione tra controllo e dimensione economica.
La ricerca intende sperimentare un nuovo approccio nello studio dei problemi applicativi del diritto societario, e avviare la necessaria rifles-sione sulla relativa impostazione metodologica
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
Application of different analytical methods for the determination of phenolics and antioxidant activity in hawthorn (Crataegus spp.) bud and sprout herbal extracts
Get PDFHawthorn (Crataegus spp., family: Rosaceae) extracts have been used as pharmaceutical preparations owing to positive effects on cardiovascular system. The AlCl3-based official method employed for the determination of pharmacologically active compounds was compared with other techniques such as Folin-Ciocalteau method and HPLC-DAD. Antioxidant activity was determined by ABTS radical cation assay. Methods were applied on extracts from buds and sprouts collected from common hawthorn (C. monogyna Jacq., C. laevigata (Poir.) DC.) located in Northeastern Italy. Phenolic content determined by AlCl3-based method, Folin-Ciocalteau method, and HPLC-DAD was in the range 23,534-27,728, 75,284-100,616 and 57,317-58,639 mg kg-1 of dry matter (DM), respectively, in buds, and 17,280-19,330, 27,653-38,590, and 30,635-32,185 mg kg-1 DM, respectively, in sprouts. Antioxidant activity ranged from 119,864 to 174,640 and 31,484 to 52,584 mg Trolox eq. kg-1 DM in buds and sprouts, respectively. Phenolic amount and profile were significantly affected by phenological stage and sampling location. Antioxidant activity was related to flavan-3-ol and hydroxycinnamic acid amount, and to non-phenolic substances. AlCl3-based method underestimated total phenolic content owing to lack of selectivity to important phenolic classes whereas Folin-Ciocalteau method was affected by non-phenolic interfering substances. HPLC-DAD proved to be more effective in determining hawthorn phenolics
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
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