1,721,033 research outputs found
Valutazione delle conoscenze in tema di AIDS in un gruppo di giiovani milanesi
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[Occult carcinoma of the thyroid gland: an epidemiological study of autopsy material]
No full textThe occurrence of occult thyroid carcinoma at autopsy was examined in 507 consecutive autopsies performed over one-year in subjects without clinical evidence of thyroid cancer, from different regions of Italy, including areas of endemic goiter. We found 54 (10.65%) occult thyroid carcinomas. In 37 cases the histologic pattern was of the papillary type, with diameter ranging between 176 and 6000 microns, 12 of these cases showed a typical papillary pattern, 6 had a marked fibrosis, 2 had a cystic pattern, one showed a lymphoid stroma, and 17 had a follicular pattern. The remaining 17 cases were medullary carcinomas, with a diameter ranging from 50 to 1600 microns. The percentage of occult thyroid carcinomas reported in the present study may constitute real value of the occurrence of this tumor in the Italian population
Immunohistochemical study of solid cell nests of the thyroid gland found from an autopsy study
No full textAn immunohistochemical study was performed to identify the histogenesis of solid cell nests (SCN) found in 30 of 202 thyroids obtained at autopsy. Immunoperoxidase staining was used to detect the presence of calcitonin, thyroglobulin, thyroxin, low and high molecular weight keratins, and carcinoembryonic antigen (CEA). Results showed that cells forming solid nests had immunoreactivity for calcitonin, low molecular weight keratin, and CEA, but not for thyroglobulin, thyroxin and high molecular weight keratin. Thus, SCN do not result from tangentially cut thyroid follicles (absence of staining for thyroglobulin and thyroxin), nor from a squamous metaplastic process (absence of staining for high molecular weight keratin), but instead they are formed by C-cells because they showed calcitonin immunoreactivity, and neurosecretory granules
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
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