1,720,980 research outputs found
Il patentino di abilitazione alla conduzione di impianti termici
No full textIl volume concerne i vari aspetti tecnici e normativi nella costruzione, manutenzione ed esercizio degli impianti di climatizzazione invernale. Come tale offre un supporto conoscitivo per gli operatori del settore e costituisce una guida per docenti e allievi dei corsi per il conseguimento dell’abilitazione alla conduzione degli impianti termici
Calretinin, β-tubulin immunohistochemistry, and submucosal nerve trunks morphology in Hirschsprung disease: possible applications in clinical practice.
No full textObjectives: The aim of this study was to investigate calretinin and b-tubulin
immunohistochemical expression together with submucosal nerve trunks
morphology in differently innervated segments of Hirschsprung disease
(HD) and total colonic aganglionosis (TCA).
Methods: A total of 25 cases (22 HD, 3 TCA) and 18 controls were
processed for calretinin and b-tubulin immunohistochemistry. Sections
representative of distal aganglionic, transition, and proximal ganglionic
segments were evaluated by a visual grading score; b-tubulin was evaluated
also by image analysis. Submucosal nerve trunks hypertrophy and
hyperplasia were measured by citomorphology. The length of proximal
segment was correlated to postoperative bowel function.
Results: Controls showed intense calretinin and b-tubulin staining. In HD
and TCA, calretinin staining was related to the presence of ganglion cells:
negative in distal, faint in transition, intense in proximal segment. b-Tubulin
staining was weak in all of the segments of HD and negative in TCA.
Hypertrophic and hyperplastic nerve trunks characterized aganglionic
segment, and progressively decreasing nerve size was observed in
transition and ganglionic segments. Transient postoperative constipation,
soiling, or enterocolitis was present in 59% of patients with HD without clear
relation to proximal segment length or presence of hypertrophic nerve
trunks.
Conclusions: Calretinin is a reliable marker of the presence of ganglion
cells, and, together with nerve hypertrophy, it helps to identify the
transition zone. Length and nerve size of proximal segment in resected
specimen did not affect the postsurgical intestinal function. Reduced
b-tubulin expression along the entire colonic tract, included proximal
ganglionic segments, may represent a potential impairing factor for the
enteric neural transmissio
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
Squamoid cyst of pancreatic ducts: a challenging differential diagnosis among benign pancreatic cysts
No full textCONTEXT:
In the last years, cystic pancreatic lesions are often detected when clinically silent, because of the wider use of diagnostic imaging techniques. First described by Othman in 2007, "squamoid cyst of pancreatic ducts" represents a cystic dilation of ducts, lined by non-keratinized squamous epithelium. We report the first case of squamoid cyst of pancreatic ducts in Italy.
CASE REPORT:
A 68-year-old woman presented a cystic lesion (4 cm) of the pancreatic tail as incidental finding at MRI. It had a thickened wall, no internal septa and no communication with the Wirsung duct were detected. A CT scan showed a lamellar calcification on its posterior wall. A 18F-FDG-PET was negative. Blood tests were normal, including CEA and CA 19-9. We performed a spleen-preserving distal pancreatectomy. Histology showed a unilocular cyst, with serous fluid and a fibrous wall, with multilayered epithelium without cytological atypias. Immunohistochemistry showed CK 7 positive and CK 5 negative. The patient is still alive and without disease after 42 months of follow-up.
CONCLUSIONS:
In the English literature only seven cases resected for this cyst type have been reported. No preoperative test can achieve a definitive diagnosis, so surgical resection remains the treatment of choice in order to exclude malignancy. However, after intraoperative frozen section, a limited pancreatic resection can be performed
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
- …
