1,721,042 research outputs found
İstanbul Ayasofyası’nın Dekorasyonlarının Az Bilinen Yönleri – Aspetti meno noti della decorazione della Santa Sofia di Costantinopoli
No full textNel contributo vengono presi in esame alcuni aspetti meno noti della decorazione della Santa Sofia di Costantinopoli nell'età di Giustiniano, in particolare le travi lignee scolpite, che si trovano in opera sia al pianterreno che nelle gallerie dell'edificio, e i fregi in stucco, i quali, pur se in massima parte di restauro, corrispondono agli originali documentati prima dei restauri ottocenteschi e vengono quindi analizzati sotto il profilo iconografico
Alcune riflessioni sulle travi lignee scolpite della Santa Sofia a Costantinopoli e sui restauri dei fratelli Fossati
No full textPolymodal activation of stretch-sensitive cation channels in leech neurons: effects of intracellular pH and Ca2+
No full textThe effects of intracellular pH and calcium on
the activity of the leech mechanosensitive cation channels
have been studied. These channels exhibited two activity
modes denoted as spike-like (SL) and multiconductance
(MC). In the absence of mechanical stimulation, acidifica-
tion of the intracellular side of membrane patches from 7.2
to 6.2 reversibly increased the mean channel open time as
well as the opening frequency in the SL mode. Channels in
MC mode were activated by a pHi reduction from 7.2 to
6.2, but were inhibited at pHi 5.5. Unlike MC mode, SL
mode was strongly activated by intracellular Ca
2+
. Fura-2
imaging experiments showed that intracellular calcium was
induced to increase by hypotonic cell swelling. The major
component of this response did not require extracellular
calcium. A component of the swelling-induced calcium
response was sensitive to blockers of stretch-sensitive
cation channels. The results indicate that the two activity
modes of mechanosensitive channels of leech neurons
respond differently to changes of intracellular pH and
calcium. The sensitivity of the channel to micromolar
concentrations of internal free calcium, along with its
permeability to this ion, is consistent with a role in the
amplification of mechanically induced Ca
2+
signals in
leech neurons
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
- …
