1,720,965 research outputs found
Caratterizzazione morfologica delle popolazioni cellulari della mucosa gastrica in Scyllium canicula
No full textOn the occurrence of endocrine cells within the pyloric mucosa of Scyliorhinus canicula: Preliminary observations
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Popolazioni cellulari endocrine del tratto gastrico dei selaci (Scyliorhinus canicula): caratteri ultrastrutturali
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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
The effect of diet on the ophthalmological, clinical and biochemical aspects of Richner-Hanhart syndrome: A morphological ultrastructural study of the cornea and the conjunctiva
No full textType II tyrosinemia (Richner-Hanhart syndrome) is a familial aminoacid disorder, clinically characterized by ocular changes (keratitis), palmo-plantar hyperkeratosis, no constant mental changes with mental deterioration, abnormal urinary excretion and high serum tyrosine level in consequence of the absence of tyrosine-aminotransferase. Almost 20 families have been described in the literature of which 50% are of Italian origin, suggesting that this disorder is particularly frequent in our country. We report a family with 2 affected members with typical clinical and biochemical findings (keratitis, palmo-plantar hyperkeratosis, abnormal urinary and serum tyrosine concentrations), not suffering from mental retardation. Clinical symptoms completely disappeared after the decrease of urinary and serum tyrosine levels following a tyrosine- and phenylalanine-free diet. These cases are compared with those reported in literature, and the usefulness of diet for the improvement of clinical and metabolic symptoms is discussed
Isoforms of Nitric Oxide Synthase in the Pig Testis
No full textNitric oxide is a biologically active molecule involved in the regulation of main functions of the body and is produced in different cellular types by the action of molecular isoforms of the enzyme nitric oxide synthase (NOS). The presence of the isoforms defined as neuronal, testicular, endothelial and inducible has been studied in the testis of adult pigs by means of immunohistochemical techniques. Western blot analysis and a biochemical quantitative method were also performed to confirm the morphological data and to assess nitric oxide tissue activity. The NOS isoforms were contained in interstitial (Leydig), sustentacular (Sertoli), and macrophage cells, as well as in spermatogonia and spermatids. Positive Leydig cells were numerous, isolated or grouped in clusters and differed in staining intensity. Testicular extracts were found to contain four types of proteins whose molecular weight was very similar to those of the NOS isoforms. The biochemical measurement of the NO2 tissue content gave the result of 155.25 ± 21.9 nmol/mg. On the basis of a detailed bibliographic review, the findings here obtained led us to hypothesize that a) the sources of nitric oxide in the pig testis are numerous, and b) the oxide could be involved in the regulation of the following testicular functions: steroidogenesis, vasodilatation, peristalsis/permeability of seminiferous tubules and development/apoptosis of germ cells
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