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Considerazioni sull’elaborazione dei dati dell’emoglobina relativi a pazienti Testimoni di Geova
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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
BLIND SEROSURVEY OF HIV ANTIBODIES IN NEWBORNS IN 92 ITALIAN HOSPITALS - A METHOD FOR MONITORING THE INFECTION-RATE IN WOMEN AT TIME OF DELIVERY
No full textIn Italy, drug abusers are the major risk category for HIV infection, representing 67% of all the reported cases of AIDS. This can in part explain the higher incidence of the infection observed in Italian females (17.7%) in comparison with the data reported in Europe (11.5%) or in the U.S. (8.5%). Therefore, anti-HIV screening in newborns reflects the serologic pattern of the respective mothers and can provide a useful tool in evaluating the incidence of the infection in a relatively unselected population. Furthermore, the data collected can provide a good predictive parameter for the rate at which pediatric AIDS will develop. Blood samples were collected on filter paper for routine screenings from 39,102 consecutive newborns in 92 hospital nurseries, from eight different Italian regions, during the period June 1988-April 1989. Blood-saturated disks were screened for anti-HIV antibodies (HIV Ab) using an ELISA; positive results were confirmed using a Western blot. Among the 39,102 blood samples tested, 51 (0.00130, 95% confidence intervals, Poisson distribution of 0.00097-0.00171) were found to be positive for HIV Ab. The distribution pattern of the positive samples among the different regions correlates to the cumulative AIDS incidence rate, with a higher prevalence in urban and industrialized areas
[Usefulness of selective partial inversion recover (SPIR) sequences in optic nerve diseases].
No full textTo evaluate the yield of SPIR sequences with fat suppression in the diagnosis of optic nerve lesions. Ten patients with suspected optic nerve involvement on the basis of clinical data and abnormalities of visual evoked potentials were examined. MRI was performed with a 1.5 T unit (Philips NT 15) using T1 weighted conventional spin-echo and T1- and T2 weighted SPIR sequences with fat suppression. Axial images were obtained along the optic nerve course, while coronal images throughout the optic nerve axis; slices were 3 mm thick. Axial T2 weighted SPIR sequences were also performed with the volumetric technique (1.5 mm thickness); coronal and parasagittal reconstructions along the nerve axis were obtained too. After paramagnetic contrast medium injection, conventional T1 weighted and SPIR sequences were performed on axial and coronal planes. Optic nerve lesions consistent with the diagnosis of neuritis were demonstrated with T2 weighted images in 4 of 10 patients. No abnormalities and/or nerve enlargement were found on T1 weighted images. An enhancement area was seen after contrast medium injection in only one case. MRI showed a pilocytic astrocytoma in one patient and selective atrophy of the right optic nerve in another. MRI showed normal findings in 4 patients. T1 and T2 weighted fat-suppressed SPIR imaging of the optic nerve improves anatomical definition, lesion detection and characterization in optic nerve conditions
interrelationship between oxytocin and eicosanoids in human fetal membranes at term gestation: which role for LTB4?
No full textCorrelation of angiographic and sequential CT findings in patients with evolving cerebral infarction.
No full textThe usefulness of CT and angiography for predicting the final ischemic brain damage resulting from supratentorial ischemic stroke was evaluated in 36 patients. CT was performed within 4 hr and angiography within 6 hr after the onset of symptoms. CT was used to assess the site and size of parenchymal brain damage and angiography was used to evaluate the cerebral circulation. A 3-month follow-up CT study was used to determine the site and size of final ischemic damage. Angiography was normal in six patients and showed complete occlusion in 30. Angiographic findings in patients with arterial occlusion were classified as either internal carotid artery occlusion or middle cerebral artery (MCA) occlusion. MCA occlusions were subdivided into occlusion before the origin of internal lenticulostriate arteries (type 1), occlusion beyond the origin of these branches (type 2), occlusion at the bifurcation of the main trunk (type 3), and occlusion of the peripheral branches (type 4). Collateral blood supply was also studied. Early CT findings were positive in 25 of 36 patients; the lentiform nucleus alone, the lentiform nucleus and the cortex, or only the cortex were involved. In all patients with positive early CT findings, angiography showed an arterial occlusion, often located in the main trunk of the MCA. Involvement of the lentiform nucleus on early CT was always seen in patients with internal carotid artery or type 1 MCA occlusion.(ABSTRACT TRUNCATED AT 250 WORDS
Antiphospholipid syndrome in a boy with double mutation of MTHFR and protrombin genes
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