1,720,963 research outputs found
The short tailed human spermatozoa. Ultrastructural alterations and dynein absence
No full textA remarkable disorder in the sperm tail of 2 unrelated patients is described. The tail was extremely short, with 3 imperfect brief axonemes arising from both centrioles. The accessory fibers were present, the tubules were rarely arranged in doublets and had no arms. Tubulin and the protein of accessory fibers were present but dynein was absent.A remarkable disorder in the sperm tail of 2 unrelated patients is described. The tail was extremely short, with 3 imperfect brief axonemes arising from both centrioles. The accessory fibers were present, the tubules were rarely arranged in doublets and had no arms. Tubulin and the protein of accessory fibers were present but dynein was absent
Integrità funzionale della membrana spermatica e sistemi antiossidanti seminali in soggetti infertili
No full textMonitoraggio con videomicrografia computerizzata (CASA) dei parametri cinetici del seme di coniglio durante somministrazione cronica “per os” di selenio organico.
No full text
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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