1,720,975 research outputs found
Un'analisi del consumo alimentare in Italia:profili di espansione sui mercati esteri e strumenti finanziari di sostegno e copertura
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Su un caso clinico di torsione uterina in gravidanza
No full textThe Authors report a case of classic cesarean section through the posterior uterine wall because of a uterine torsion with failure of restitution at 31st week of pregnancy, abruptio placentae, premature rupture of the membranes and partial septate uterus. The uterine torsion is a very rare complication in pregnancy, but it is associated with serious fetal and maternal consequences
Umbilical cord blood: The role of apoptosis in the control of CD34+ cell counts
No full textBackground and Objective: Cord blood obtained at delivery can be used for hematopoietic precursor cells (HPC) transplantation. The major limit for its success is represented by the low cellular yield of the stem cell population. The objective of this study was to determine the role played by apoptosis in the numerical control of CD34+ cell counts. Design and Methods: Umbilical Cord blood samples were collected from 15 women at the time of the delivery and cord blood units processed. Cells, collected following 24 h and 48 h of incubation, were analysed by flow cytometry using the gating strategy. Results: Remarkable levels of apoptosis were detected in the stem cell population and a significant difference between apoptosis mean values at 24 h and 48 h within CD34+ cells were found. The difference between the percentage of apoptosis in CD34+ cells and that in the remaining population was significant both at 24 h and at 48 h. Conclusions: CD34+ cells have a higher likelihood to undergo apoptosis in comparison to the remaining ones present in umbilical cord blood. This process of cellular death plays a major role in the control of CD34+ cell counts in placental blood and influence, for this reason, the possibility of success of a cord blood transplantation. © 2002 Elsevier Science Ltd. All rights reserved
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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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