1,720,999 research outputs found
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
Ancora sui prestiti armeni nei dialetti romani
No full textRiprendendo un filone di ricerca già da lui coltivato, l’autore discute alcuni possibili prestiti armeni nella romani, di cui non ha avuto modo di trattare in precedenza. Come sempre, il dato linguistico è utilizzato anche per stabilire l’epoca in cui sarebbe avvenuto il contatto fra i parlanti delle due lingue
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
HE BITANEY LAGGE- Studies on language and African linguistics in honour of Marcello Lamberti
No full textAcute and chronic acidosis influence on antioxidant equipment and transport proteins of rat jejunal enterocyte
No full textAcidosis elicits the formation of oxidants and, in turn, ROS (reactive oxygen species)-induced intestinal diseases cause acidosis. This research investigated whether both acute and chronic acidosis influence the antioxidant enzymatic equipment of rat jejunocyte, including γ-GT activity, involved in GSH (glutathione) homoeostasis. Lipid peroxidation level and the expressions of (Na+,K+)-ATPase and GLUT2 were also investigated. The possible influence of acidosis on ROS action was tested. Isolated apical membranes, everted sac preparations and homogenates from acidotic rats were used. γ-GT activity is inhibited after incubation of isolated membranes at acidic pH, but using the whole intestinal tract this inhibition disappears, while SOD (superoxide dismutase) and GR (glutathione reductase) activities are enhanced. Also, in conditions of chronic acidosis, c-GT activity is unaffected, but no variations of antioxidant activities are apparent. (Na+,K+)-ATPase expression increases, while GLUT2 decreases in acidotic animals. Lipid peroxidation level is unaffected by acidosis. H2O2 inhibits γ-GT activity only in isolated membranes; in the whole tissue, it enhances CAT (catalase) and SOD activities and reduces GLUT2 expression. The pattern of responses to oxidant agents is unaffected by acidosis. Although jejunum seems quite resistant to acidosis, results, suggesting specific responses to this condition, may direct further research on antioxidant supplementation
A creatine transporter is operative at the brush border level of the rat jejunal enterocyte
No full textAlthough ergogenic effects and health benefits have been reported for creatine used as nutritional supplement, to date little is known about the mechanism of creatine absorption in the small intestine. Thus the current study was undertaken to elucidate the mechanism of creatine intake in rat jejunum with the use of well-purified brush border membrane vesicles, isolated from jejunal enterocyte. Creatine uptake was found markedly stimulated by inwardly directed Na+ and Cl- gradients, potential-sensitive, strongly reduced by the substitution of Na+ and Cl- with various cations and anions and positively affected by intravesicular K+. Moreover creatine uptake is: 1) significantly inhibited by creatine stuctural analogs, 2) abolished by low concentrations of MTSEA, 3) saturable as a function of creatine concentration with an apparent Michaelis-Menten costant of 24.08 ± 0.80 mM and a maximal velocity of 391.30 ± 6.19 pmoles mg protein-1 30 s-1. The transport is electrogenic since at least two Na+ and one Cl- are required to transport one creatine molecule. Western blot analysis showed the same amount of creatine transport protein in the jejunal apical membrane when compared to ileum.
Thus these data demonstrate the existence of a Na+- and Cl--dependent, PD-sensitive, electrogenic carrier-mediated mechanism for creatine absorption in rat jejunal apical membrane vesicles, which is biochemically and pharmacologically similar to those observed in other tissues. However in other cell types the stimulatory effect of intravesicular K+ was never detected
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
Contested orthographies
No full textPiedmontese (today mainly spoken in Italy and Argentina) is one of the non-standardized languages of Italy with the most highly normalized orthographies. Nonetheless, new orthographic reforms and revisions were proposed in the early 2000s, allegedly in order to reflect the habitual choices of the speech community/ies, which are fully literate, but only in Italian or in Spanish.This chapter examines the graphic choices of Piedmontese speakers with no command of the written language, when posting to Facebook groups in which the use of Piedmontese is possible and/or prescribed.The data suggests that naïve writers of Piedmontese adhere closely to Standard Italian orthographic choices when writing Piedmontese, and use a highly restricted range of allographs to represent the more distinctive phonemes in the Piedmontese sound inventory. Interestingly, these allographs generally diverge from both a strictly phonemic orthography, and the various orthographies proposed from a ‘top-down’ perspective for Piedmontese. They seem rather to be consistent with the way in which writers of other non-standardised languages of Italy naïvely represent phonemes that are not part of the Italian inventory
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