1,721,946 research outputs found
La risposta dei nematodi e dei rotiferi bdelloidei a stress dell’ambiente spaziale: radiazioni cosmiche e microgravità.
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A reconsideration of the taxonomic status of Macrotrachela quadricornifera (Rotifera, Bdelloidea)
No full textThe study focuses on the differences between large and small forms of a rotifer species, Macrotrachela
quadricornifera (Rotifera, Bdelloidea), by reviewing the literature and adding further morphological
differences. Evidence from life-history traits, growth patterns and trophi (hard structures of the specialized
rotifer pharynx) morphology suggests that the large and small forms of M. quadricornifera should not be
considered the same species. Macrotrachela vanoyei Schepens, 1954 is re-established as a good species,
differing from M. quadricornifera in the smaller size of body, egg and trophi, as well as the number of
proximal and distal teeth on the trophi
Le prefetture nell’organizzazione istituzionale dell’Italia di I secolo a.C.
No full textThis paper reconstructs the development during the first century BC of viritane settlements and of municipia visited by the praefecti of the praetor in the middle Roman Republic. The author further supposes that some of the new communities admitted into the Roman
citizenship after the Social War could have been established as prefectures with self-government and autonomy
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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